Inverter

The power electronics device which converts DC power to AC power at required output voltage and frequency level is known as inverter. Multilevel inverter is to synthesize a near sinusoidal voltage from several levels of dc voltages. In order to maintain the different voltage levels at appropriate intervals, the conduction time intervals of MOSFETS have been maintained by controlling the pulse width of gating pulses. In this paper single phase to three phase power conversion using PWM technique. The simulation is carried out in MATLAB/Simulink environment which demonstrate the feasibility of proposed scheme.

This paper develops a new control algorithm of a distributed generation system in the standalone operation. Behaviour of three-phase voltage source inverter is investigated and the guidelines for tuning the control parameters are presented. Based on Super-Twisting algorithm, the proposed controller guarantees the load voltage performance under different types of loads. The proposed controller is established for an inner-loop current controller and an outer-loop voltage controller in a dual control scheme. The proposed scheme is very simple, thus tuning control parameters is easy and the computational burden of the controllers is low. In order to validate the load current of the proposed system feasibility, a reduced-order observer is adopted. The simulation results indicate a more reliable and efficient performance compared to the standard sliding control and the adaptive control.

Penelitian ini bertujuan untuk merancang inverter satu fasa untuk mengatur nilai frekuensi dan tegangan AC pada keluaran inverter. Hal ini dimaksudkan untuk memperbaiki atau meningkatkan efisiensi energi listrik pada beban satu fasa. Sistem ini dapat direalisasikan dengan menggunakan mikrokontroler, sehingga lebih ekonomis dan cocok untuk kebutuhan industri dan rumah tangga. Tegangan keluaran inverter diatur dengan mengubah nilai puncak pada output konverter SEPIC pada sisi terminal input inverter, sedangkan frekuensi output inverter diatur melalui modulasi SPWM. Untuk memvalidasi metode yang diusulkan, prototipe inverter satu fasa dengan kapaistas 150 W dirancang dan diuji di laboratorium. Penelitian ini dapat menjadi teknologi alternatif yang tepat guna dan mampu bersaing dengan teknologi yang telah ada saat ini.

A new design methodology is presented for outputting digital information from asynchronous analogue circuits, which allows signed frequency encoded signal transfer along a single channel. The circuit outputs data as a series of rate and pulse-width encoded spikes: pulsewidth modulation is used to represent vector and pulse frequency modulation is used to represent magnitude symbiotically. This technique can be used to increase the bandwidth of multiplexed neural signals, such as for address event registration, or by using a time-tofirst-spike system, to multiplex signals on a single channel. Additionally, feedback has been used to improve the switching speed of current starved inverters, reducing their power consumption by over an order of magnitude.

This paper presents an impedance-source (or impedance-fed) power converter (abbreviated as Z-source converter) and its control method for implementing dc-to-ac, ac-to-dc, ac-to-ac, and dc-to-dc power conversion. The Z-source converter employs a unique impedance network (or circuit) to couple the converter main circuit to the power source, thus providing unique features that cannot be obtained in the traditional voltage-source (or voltage-fed) and current-source (or current-fed) converters where a capacitor and inductor are used, respectively. The Z-source converter overcomes the conceptual and theoretical barriers and limitations of the traditional voltage-source converter (abbreviated as V-source converter) and current-source converter (abbreviated as I-source converter) and provides a novel power conversion concept. The Z-source concept can be applied to all dc-to-ac, ac-to-dc, ac-to-ac, and dc-to-dc power conversion. To describe the operating principle and control, this paper focuses on an example: a Z-source inverter for dc-ac power conversion needed in fuel cell applications. Simulation and experimental results will be presented to demonstrate the new features.

Abstruct-Acoustic noise emission from PWM-VSI inverter driven induction motors is a well-known problem. The generated noise depends mainly on two factors: the harmonic content of the supply voltage waveform and the mechanical resonance frequencies of the induction motor. It is necessary to know the mechanical resonances to optimize the switching scheme of the inverter to reduce the noise emission. Measuring the resonance frequencies is normally a laborious process. This paper introduces a new method for estimating the mechanical resonances from acoustic noise measurements. Employing random modulation of the output voltage of the inverter, the voltage spectrum can be spread over a wide frequency range. Using the spectrum analysis of the measured acoustic noise, the resonances can easily be estimated as the dominant frequencies of the acoustic noise spectrum. The method was tested on a 2.2-kW induction motor at no load and full load. Some of the mechanical resonances of the motor at no load were calculated by the Holzer method. The calculations showed good agreement with the sound measurements.

The application of multilevel converters for traction drive systems is being investigated. The main advantage of this kind of topology is that it can generate almost perfect current or voltage waveforms, because it is modulated by amplitude instead of pulse-width. That means that the pulsating torque generated by harmonics can be eliminated, and power losses into the machine due to harmonic currents can also be eliminated. Another advantage of this kind of drive is that the switching frequency and power rating of the semiconductors is reduced considerably. The amplitude modulation is based on a cascade of N converters scaled in a “trinary” form (three-state “H” converters). In the chain of N converters of each phase (N-Stage Converter), there is a “Master converter” that manages more than 80% of the total power, and N-1 “Slave converters” that take the rest of the power (less than 20%). One important drawback of this kind of arrangement is that it needs isolated power sources for ea...

Installations of Solar Photovoltaic systems in distribution networks are increasing in very swift manner. These PV systems have both pros and cons associated with it. In terms of cons, it has power electronic devices which provides harmonics and thus affects the power quality of the grid by causing harmonic distortion. The aim of this study is the harmonic analysis of PV systems on grid. To emulate a realistic scenario a certain level of harmonics is also injected in the considered network through a dynamic load. Number of PV sources has increased and then the THD is analyzed for these cases. The scheme involves photovoltaic generation (PV) modules which are basically act as a DC current Source, which is connected to the grid through DC-DC converter and DC-AC Converter. Instead of current source inverter a voltage source inverter is utilized and the controlling technique is applied owing to control the voltage source inverter. MATLAB/SIMULINK tool has been used to simulate the considered grid connected PV system and to analyze it for the varying environmental conditions. Maximum power point tracking based on perturb & observe algorithm has been considered to analyze the system for maximum utilization under different irradiation and panel temperatures. These PV system provides harmonic distortion in the grid which affects the power quality of the grid as it is large in number. And with the no. of PV systems increasing rapidly it may become a bigger problem.

This paper represents the modeling and simulation of 2 MW Direct Drive permanent magnet synchronous generator (PMSG) Wind energy conversion system (WECS). The modeling of wind turbine and PMSG is carried out in simulink to determine its parameter. WECS consists different components namely Wind turbine, Generator, rectifier-inverter, controller system including transformer, grid etc. The PMSG and converter model are established in the d-q model. Renewable energy technologies offers clean, abundant energy gathered from self-renewing resources such as the sun, wind etc. As the power demand increases, power failure also increases. So, renewable energy sources can be used to provide constant loads. A new converter topology for hybrid wind/photovoltaic energy system is proposed. Hybridizing solar and wind power sources provide a realistic form of power generation. Simulation is carried out in MATLAB/ SIMULINK software and the results of the Cuk converter, SEPIC converter and the hybridize...

This paper review analysis of the performance of a fuel cell energy source based Multi Level Inverter topology. Multi Level Inverter topologies are suitable in high power application due to their ability to synthesize waveforms with better harmonic spectrum. The Multilevel inverter circuit analysis and selection of proper references discussed based on the formulation switching patterns. A Single phase five level cascaded inverter is used to explain the methods. The method can be easily extended to an m-level inverter. The cascaded inverter is subjected to a new modulation scheme, which uses multiple modulating signals with a single carrier. In order to justify the merits of the proposed modulation scheme, harmonic analysis for and measured THD and output voltages are compared and discussed.

The resonance converters are widely used in induction heating, emergency power supplies or for signal filtering in electrical power conversion. Today, research in the field of resonance converters represents an important part of the research, especially with the development of digital calculators and control units such as DSP, FPGA, and Microcontrollers. The digital control is a branch of control theory that uses digital computers and calculators to act as system controllers, it has been greatly used in different applications such as the power transmission and if compared to traditional analogue control the digital control has many advantages. In this work, we have mainly interested in the design and implementation of a singlephase resonant inverter witch controlled by an Arduino board. The objective is to achieve high-frequency waveforms signals and take a look at a very attractive physical phenomenon called the resonance. The obtained results show the effectiveness and the operating simplicity of the series resonant inverter with two switches and the effectiveness of the digital control through the Arduino board at high-frequency levels.

The paper deals with methods of identification of the parameters of an induction motor model using genetic algorithms. It is supposed that the inverter supplying the motor is directly accessible for control of the conduction sequences of its power switches. This makes it possible to carry out a test consisting of a transient from standstill to steady-state operation at a given frequency and successive free motion to standstill. During this test, data are acquired referring to stator voltages, and currents and speed. Then, a genetic algorithm is employed with the aim of determining the mechanical and electrical parameters of the model, so as to reproduce the input-output behaviour of a real open-loop system.

CNC machining nowadays makes more use of "Mechatronics" increasingly. Combining numerical control with mechanic, electric, and data processing systems can lead to new methods of production. In recent years, the development of CNC has made it possible to perform nonlinear correction motions for the cutting of spiral bevel gears. In this paper, we attempt to manufacture the spiral bevel gear using a three-axis CNC milling machine interfaced with an additional PLC module based on traditional discontinuous multicutting method accomplished by using a universal milling machine interfaced with an indexing work head. This research consists of (a) geometric modeling of the spiral bevel gear, (b) simulating the traditional and our new nontraditional method using a CAD/CAE system, (c) process planning for CNC machining and PLC Programming, (d) experimental cuts with a three-axis CNC milling machine were made to discover the validity of the presented method. The results demonstrate that invented experimental cutting method of SBGs not only is less expensive than advanced CNC machining but also produces gears in a shorter time in comparison with the traditional cutting. Thereby, it is an economical method in manufacturing of SBGs.

Electric vehicles offer number of advantages over the conventional combustion engines. Lower local emission and the higher energy efficiency are the most important factors found in electric vehicles. Sri Lanka is not much familiar with the electric vehicles, especially electrical three-wheels. Most of the electric three-wheels are manufactured without the safety precautions, and the major disadvantage of the three-wheels is passenger's safety. Due to the safety issues, Sri Lankan Registry of Motor Vehicles (RMV) does not allow vehicles importers to sell their electric vehicles. Hence, companies are looking for the safety device which can use with the electric vehicles (three-wheels). The aim of this project is to develop electrical safety system for the passenger's safety.<br>

The reliability of a motor control based on a variable speed drive is an important issue for industrial applications. Most of these machines are inverter based induction motors and are used in specific and complex industrial installations. Unlike the induction motor, the feeding part is very delicate and sensitive to faults. In order to improve system performance, it is therefore very important for a researcher to know the impact of a fault on the whole of his drive system. This paper discusses the short-circuit fault of the DC-link capacitor of an inverter fed induction motor. The simulation results of this type of faults are presented and its impact on the behavior of the rectifier, the inverter as well as the induction motor analyzed and interpreted.

Conventional predictive direct torque control (PDTC) of permanent magnet synchronous generators (PMSGs) with weighting factors suffers from extensive calculation burden and weighting factor tuning work. This paper proposes three predictive direct torque control techniques for PMSGs without weighting factors. The first proposed control strategy is based on the torque and reactive torque. Reactive torque has the same order of magnitude as torque, which eliminates the need of weighting factor in the cost function. The second proposed control strategy is based on estimating the q-axis reference current from the demanded torque and setting the d-axis reference current to zero, which achieves the maximum torque per ampere (MTPA) operation. Then, according to the deadbeat principle the reference voltage vector (VV) is directly computed from the reference current vector. The cost function design for this strategy includes only the reference voltage vector and the candidates one. The third proposed method is based on two separate cost functions, one is for the torque and another is for d-axis current. The proposed three control strategies eliminates the need of weighting factors and therefore, no tuning work is required.

Rapid depletion of fossil fuel reserves, and concerns over climate change have encouraged power generation from sustainable energy based microgrids. And to address the necessity of three-phase inverters in microgrid systems or sustainable-powered households, an Arduino-based three-phase inverter using MOSFET is designed, which converts DC into three-phase AC power. The designed system generates 223V square signals at each phase from a 12V battery through switching of three stages of power MOSFETs using pulse width modulation (PWM) signals at their gates from an Arduino Uno. Each stage of power MOSFETs consists of six transistors making it eighteen in total, which are used to perform the inversion process separately for each three single-phase connections. The system is programmed using an Arduino Uno to generate PWM signals and to keep 120 degrees phase displacement among each phase. Three step-up transformers are coupled at the outputs of MOSFET stages for amplification. The system...

Due to consider the fossil fuels, coal, and natural gasses, researchers doing much scientific research into it. As a result of the shortage of those above-mentioned factors, global warming may increase. To solve these problems, using natural renewable energy resources is one of the best sources of energy without increasing global warming. This research can be considered with the objective of supplying water to the agriculture purpose. Normally water pumping systems include a generator driven pump. These mechanisms have many problems such as: energy consumption, require high maintenance (fuel consumption) and diesel generator pump has environmental impacts. This study will address the above-mentioned problems by using a non-convectional based power system for water pump rather than using convectional based. Solar-powered water pumping system is one of the options, because it has less maintenance (no moving parts), easy to install, and, environmentally friendship via lifetimes and economically feasible after installation. MATLAB was used for modeling and simulation of Buck converter, Inverter, PV Cell, PV Array and HOMER software was used for PV water pumping economic cost analysis. The designed system is capable of providing 85m3per day daily water consumption of 92,400 litres per household at a total head of 76m. A comparison of the unit cost of water shows that PV water pumping is high at initial but drops to$0.16 per Kwh as installation completed than a diesel generator $0.22 per Kwh and $0.34 per Kwh of grid electricity. The outcome of the study will serve the community by supplying water and make the communities familiar with solar technologies.

An inverter circuit by using Sinusoidal Pulse Width Modulation (SPWM) switching schemes is developed to run AC utilities. Inverter is a circuit that converts a DC source to an AC source. DC is one type of energy that is found in solar panels and can be stored in ...

With the increasing demand for solar energy as a renewable source has brought up new challenges in the field of energy. However, one of the main advantages of photovoltaic (PV) power generation technology is that it can be directly connected to the grid power generation system and meet the demand of increasing energy consumption. Large-scale PV grid-connected power generation system put forward new challenges on the stability and control of the power grid and the grid-tied photovoltaic system with an energy storage system. To overcome these problems, the PV grid-tied system consisted of 8 kW PV array with energy storage system is designed, and in this system, the battery components can be coupled with the power grid by AC or DC mode. In addition, the feasibility and flexibility of the maximum power point tracking (MPPT) charge controller are verified through the dynamic model built in the residential solar PV system. Through the feasibility verification of the model control mode and the strategy control, the grid-connected PV system combined with reserve battery storage can effectively improve the stability of the system and reduce the cost of power generation. To analyze the performance of the grid-tied system, some real-time simulations are performed with the help of the system advisor model (SAM) that ensures the satisfactory working of the designed PV grid-tied system. Keywords: Control strategy Depth of discharge Grid-tied system Insolation Inverter Lithium-ion battery Photovoltaic This is an open access article under the CC BY-SA license.

The renewable energy systems are an attractive option to electrify the community as they are environment friendly and free of cost. In this project solar and hydro system as a smart technological concept of the sustainable energy which can provide continuous electric power to the load is used. This project deals to improve the efficiency of renewable sources by using them in parallel. Due to intermittent nature of both the hydro and solar energy sources, utility grid is connected to the system for ensuring the continuous power flow. The power contribution of the system is Hydropower-7.4Watt, Solar power-8-9Watt.[2].

In this paper, the design procedures of single phase PWM multicellular inverter prototype using MATLAB/ Simulink blocksets and code generation tools for TMS320F335 floating-point digital signal processor (DSP) is presented. The control circuit is realized on a digital signal processor TMS320F28335 development board based on triangular-sinusoidal PWM control strategy which is specially designed for multicellular converters. Single phase inverter is used to convert the PWM signal from the digital signal processor to an analog signal. For this the single-phase IGBT multicellular inverter is designed with the gate driver. The experimental results of PWM strategy controlled by a digital signal processor TMS320F28335 chip has been observed.

This paper proposes a new voltage source inverter (VSI) referred to as a boost inverter or boost dc-ac converter. The main attribute of the new inverter topology is the fact that it generates an ac output voltage larger than the dc input one, depending on the instantaneous duty cycle. This property is not found in the classical VSI, which produces an ac output instantaneous voltage always lower than the dc input one. For the purpose of optimizing the boost inverter dynamics, while ensuring correct operation in any working condition, a sliding mode controller is proposed. The main advantage of the sliding mode control over the classical control schemes is its robustness for plant parameter variations, which leads to invariant dynamics and steady-state response in the ideal case. Operation, analysis, control strategy, and experimental results are included in this paper. The new inverter is intended to be used in uninterruptible power supply (UPS) and ac driver systems design whenever an ac voltage larger than the dc link voltage is needed, with no need of a second power conversion stage.

The trend in the motor applications is to reduce weight and volume by increasing the efficiency. Because of the advantage of high efficiency and high density, interest in brushless DC motors and drives is increasing. Unlike DC motors, the brushless DC (BLDC) motors require inverter circuit and position detector. In this paper, we deal with the optimization of the BLDC motor, the inverter, and the position detector. The inverter is optimized to be mounted on the BLDC motor. This paper deals primarily with the design and implementation aspects of the BLDC motor and the integrated drive circuit. Experimental results for the prototype of the BLDC motor with integrated dirve circuit in the laboratory are presented to validate the feasibility.

Alat yang satu ini banyak digunakan dalam industri karena memiliki kemampuan mengubah arus DC menjadi arus AC. Dari pada kalian terus penasaran dan bertanya-tanya mengenai apa itu inverter, simak ulasan selengkapnya dibawah ini. Pengertian Inverter Inverter ialah suatu rangkaian elektronika daya yang digunakan untuk mengkonversi atau mengubah tegangan searah "DC" menjadi tegangan bolak-balik "AC". Inverter merupakan kebalikan dari coverter "adaptor" yang memiliki fungsi mengubah tegangan bolak-balik "AC" menjadi tegangan searah "DC". Untuk saat ini terdapat beberapa tipologi inverter, mulai dari inverter yang hanya menghasilkan tegangan bolak-balik saja "push-puli inverter" sampai dengan inverter yang mampu menghasilkan tegangan sinus murni tanpa harmonisasi. Selain itu inverter juga bisa diklasifikasikan menjadi beberapa bagian berdasarnya fasanya, mulai dari satu fasa, tiga fasa, sampai dengan multifasa. Untuk dapat merubah arus tersebut, dibutuhkan tegangan dan frekuensi yang sesuai dengan perancangan rangkaiannya. Dengan kata lain sumber input yang dibutuhkan inverter adalah arus DC, dan kita dapat melihat hasilnya pada baterai dan aki. Dengan adanya inverter, kita juga dapat menggunakan peralatan rumah tangga seperti mesin cuci, kulkas, televisi dan lain-lain. Karena pada umumnya peralatan tersebut menggunakan arus listrik AC. Fungsi Inverter Seperti yang telah dikatakan tadi, inverter memiliki fungsi mengubah tegangan searah "DC" menjadi tegangan bolak-balik "AC", perubahan tersebut dilakukan dengan mengubah kecepatan motor AC dengan cara mengubah frekuensi outputnya. Jadi bisa dibilang inverter ini multifungsi dapat mengubah arus AC ke DC, lalu mengembalikannya lagi ke AC. Inverter banyak digunakan pada bidang otomatisasi industri, pangaplikasian inverter biasanya terpasang di proses linear "parameter yang bisa diubah-ubah". Linear yang diamksud memiliki bentuk seperti grafik sinus atau sistem axis "servo" yang membutuhkan atau memerlukan putaran yang presisi.

These instructions give you basic guidelines for The purpose of the research is to design an electric circuit that can convert from DC to AC with pure sinusoidal wave. It is characterized by high efficiency and very low price without an occurrence of the resonant phenomenon or interference problems. Why using general inverter for any load despite the possibility of using an inverter for a specific load! Today all countries seek to increase using solar power plants and electric cars. This requires an inverter with high efficiency and high purity of the output wave, therefore high costs. But if we use the inverter for specific loads, it is possible to get an output wave with high purity and lower price. It is not economic to use a general inverter to feed a few loads but in this case it is preferable to use the inverter for specific loads such as to be designed to work with the electric motor in electric vehicles powered by an AC motor or designed for heavy household loads. Low cost will be an important factor in increasing solar-powered homes and increasing sales of AC electric vehicles.

PV inverters have been tested according the procedure defined in the EN 50530 standard-overall efficiency of grid connected photovoltaic inverters. Maximum power point tracking efficiency, static and dynamic, power electrical conversion and overall efficiencies are measured. Results for two models of microinverters and for one string inverter for comparison purposes are presented in this work.

This research article presents the method to control the DC voltage of the boost converter by using a proportional-integral (PI) controller. With AC voltage from a wind turbine generator, converting to DC voltage level by rectifier, this DC voltage controlled by PI controller is to control boost converter that sends DC links to the inverter which converting alternating current voltage to direct current voltage through three-phase load and to the grid-connected system. For switching the IGBTs in the inverter, the PWM signal, on the hysteresis current control, is controlled by the signal from the detected reference voltage based on the grid-connected system and the voltage from a wind turbine generator. The tests made the comparison of results from the simulation with the MATLAB/Simulink program and result from the hardware on the prototype. The power quality results, such as harmonic, power factor, are in acceptable ranges.

In this study, the most common multilevel inverter topologies and control schemes have been reviewed. Multilevel inverter topologies (MLIs) are increasingly being used in medium and high power applications due to their many advantages such as low power dissipation on power switches, low harmonic contents and low electromagnetic interference (EMI) outputs. The selected switching technique to control the inverter will also have an effective role on harmonic elimination while generating the ideal output voltage. Intensive studies have been performed on carrier-based, sinusoidal, space vector and sigma delta PWM methods in open loop control of inverters. The selection of topology and control techniques may vary according to power demands of inverter. This paper and review results constitute a useful basis for matching of inverter topology and the best control scheme according to various application areas.

The grid connected Wind Energy Conversion Systems (WECSs) have two practical topologies, the traditional fixed speed and the new variable speed. Variable speed systems have several advantages over the traditional ones, such as reduction of mechanical stress and increase in captured energy; however, the systems need a Power Electronic (PE) converter, in which the machine is connected to the grid via the PE converter. To improve the power quality and decrease electrical losses in the variable speed WECS, choosing a full control PE converter or a simple PE converter including an active filter is essential. In this paper, a new modulation technique is proposed to be used in a Shunt Active Filter (SAF) to improve the output current harmonics of a WECS, including a Permanent Magnet Synchronous Generator (PMSG) and the AC-to-DC converter. The filter contains three parts: the identification, modulation, and an inverter. Most identification methods are sensitive to non-sinusoidal sources, but in the proposed filter an algorithm is used to make it non-sensitive to some extent. The simulation results confirm the superior performance of the proposed SAF over the previous SAFs applied in wind energy conversion systems.

To address the requirement for three-phase inverters in microgrid systems or sustainable-powered industrial facilities, a MOSFET-based three-phase inverter is designed and implemented, which can convert DC power into three-phase AC. The designed system produces 223V square (AC) waves at each phase from a 12V battery (DC) through switching of three stages of power MOSFETs using PWM signals at their gates from an Arduino Uno R3. Each stage of MOSFETs consists of six MOSFETs making it eighteen in total, which are used to perform the inversion process separately for each of three single-phase connections. The system is programmed through the Arduino Uno to generate the PWM signals and to keep 120 degrees phase displacement among each phase. Three center-tapped step-up transformers are used at the outputs of MOSFET stages for signal amplification. Using a 60W incandescent light bulb at each phase as a load, the system produces 386.2SV of voltage for three-phase line, delivering 0.58A of ...

Energy is the need of the day. The generation of energy from conventional sources are under exploitation. The conventional energy pollutes environment severely and its least availability. So, India turned to produce electricity on the usage of non- conventional energy resourceslike solar, wind, hydro etc. According to the development of India, Electricity generation on non-conventional energy sources also plays a major role. On behalf of this, the application based solar-wind hybrid system projects is more powerful than other combined sources. Hybrid energy system is the combination of any two energy sources in a power system to fulfil the requirement of consumers. Thissystem can be designed for both of grid and on grid and also providing the uninterrupted supply in various climatic conditions. Some of the hybrid generation systems are solar- wind, solar-diesel, wind-hydro and wind-diesel. This Project mainly on non-grid connected solar and wind hybrid power system.

Digital circuits can be constructed from a small number of primitive elements by combining them in innumerable ways. In the following paper introduces the gate, a circuit with one or more input signals but only one output signal. Gates are digital (two state) circuits because the input and output signals are either Low or high Voltages. Gates are often called logical circuit because they can be analyzed with Boolean algebra.

The use of power converters is very important in maximizing the power transfer from renewable energy sources such as wind, solar, or even a hydrogen-based fuel cell to the utility grid. A LCL filter is often used to interconnect an inverter to the utility grid in order to filter the harmonics produced by the inverter. Even though there is an extensive amount of literature available describing LCL filters, there has been a gap in providing a systematic design methodology. Furthermore, there has been a lack of a state-space mathematical modeling approach that considers practical cases of delta and wye connected capacitors showing their effects on possible grounding alternatives. This paper describes a design methodology of a LCL filter for grid-interconnected inverters along with a comprehensive study of how to mitigate harmonics. The procedures and techniques described in this paper may be used in small-scale renewable energy conversion systems and may also be retrofitted for medium and large-scale grid connected systems.

This paper discusses the usefulness of inverter to support bi-directional power flow in grid connected systems. The design includes a bidirectional inverter (single phase) along with a dc-dc converter interfaced with a battery bank or any renewable resources such as solar arrays, fuel cells etc. In this paper, battery bank is used when grid requires additional power to meet out load demand, battery operates in discharge mode and power is fed into the grid. When grid has surplus power, battery operates in charge mode and power is fed into the battery. During discharge mode, power is fed at unity power factor. The simulation studies are carried out with the help of MATLAB/SIMULINK. The hardware is implemented with Arduino Atmel 328 with an AVR microcontroller. The inverter designed is of high efficiency energy output, lower cost.

Pure sine wave inverters are demand of modern era whenever it comes to utilization of DC power sources for both low and high power applications. These invertors not only increase the efficiency of the power system but also prevent the electrical components from damaging. Research has been carried out on producing cost-effective and efficient pure sine wave inverter in recent times and this paper proposes a design that is highly useful for low power based applications. Paper focuses on utilizing renewable solar energy by incorporating Multi vibrator IC (NE 555), in this case operating in A-stable mode, for the PWM generation technique used to drive pure sine wave inverter. It is shown that the design is easy to implement and proves to be cost effective for low power applications.

Aujourd’hui, La technique des convertisseurs à résonance représente une partie de recherche importante, recherche liée également à des applications performantes et puissantes tels que les alimentations de secours, ozoneurs et les chauffages par induction. Il y a plusieurs types de convertisseur résonant, tel que : l’onduleur à résonance série, onduleur à résonance parallèle, convertisseur de résonance de classe E, redresseur de résonance de classe E, convertisseur résonant à commutation de tension nulle, convertisseur résonant à commutation de courant zéro, convertisseur résonant à deux quadrants. Dans ce travail nous sommes intéressé à l’étude et la conception d’un onduleur à résonance série, l’étude commencée par la description de système et la topologie proposée ensuite une simulation et réalisation de l’onduleur effectué, les signaux de commande sont implémenté par la carte arduino uno, la comparaison entre les résultats de simulation et expérimentaux nous donne une concordance et avec la carte de commande nous pouvons avoir des signaux de commande en hautes fréquences.
Keywords—La résonance; Onduleur; Haute frequence; Arduino

This paper represents the modelling and simulation of 2 MW Direct Drive PMSG Wind energy conversion system (WECS). The modelling of wind turbine and PMSG is carried out in simulink to determine its parameter. WECS consists different components namely Wind turbine, Generator, rectifier-inverter, controller system including transformer, grid etc. The PMSG and converter model are established in the d-q model.

This paper represents the modeling and simulation of 2 MW Direct Drive permanent magnet synchronous generator (PMSG) Wind energy conversion system (WECS). The modeling of wind turbine and PMSG is carried out in simulink to determine its parameter. WECS consists different components namely Wind turbine, Generator, rectifier-inverter, controller system including transformer, grid etc. The PMSG and converter model are established in the d-q model. Renewable energy technologies offers clean, abundant energy gathered from self-renewing resources such as the sun, wind etc. As the power demand increases, power failure also increases. So, renewable energy sources can be used to provide constant loads. A new converter topology for hybrid wind/photovoltaic energy system is proposed. Hybridizing solar and wind power sources provide a realistic form of power generation. Simulation is carried out in MATLAB/ SIMULINK software and the results of the Cuk converter, SEPIC converter and the hybridized converter are presented.