2019 IEEE Energy Conversion Congress and Exposition (ECCE), 2019
Linear induction motors used in magnetic levitation (maglev) trains use a higher constant slip fr... more Linear induction motors used in magnetic levitation (maglev) trains use a higher constant slip frequency operating scheme than rotary motors to meet thrust and normal force requirements. Thus, the constant slip frequency is used in all operation conditions, which reduces the efficiency of the propulsion system. In this paper, a varying slip frequency control is proposed for increasing the propulsion efficiency within the limit of vertical force disturbance. The operation pattern of the actual train is defined by the route travel plan, which is adopted in simulation. The proposed varying slip frequency control pattern is verified by the actual maglev train test. With the proposed algorithm, efficiency consumption is improved not only in the propulsion system but the total power in the maglev train operation.
Journal of Electrical Engineering & Technology, 2021
The optimal design of an electromagnetic machine requires enormous computation time and includes ... more The optimal design of an electromagnetic machine requires enormous computation time and includes multi-optima in a design area. Multimodal optimization is a useful method for multi-optima problems. In this paper, a novel multimodal algorithm, specifically a sub-domain algorithm with dynamic area sampling (SADAS), is proposed. A conventional kriging has a memory problem that occurs when increasing the grid density for resolution of interpolation. The SADAS solves this problem by using a sub-domain method. Furthermore, a novel sampling method, dynamic area sampling, is proposed to improve the capability of peak search and convergence speed. The validity of the SADAS is verified by test functions and it is applied to the optimal design of an interior permanent magnet synchronous motor for an electric bus.
This paper presents the analyses and experimental results of a single-sided linear induction moto... more This paper presents the analyses and experimental results of a single-sided linear induction motor (SLIM) thrust and normal force for the propulsion of semi-high-speed magnetic levitation (maglev) trains. These trains are composed of a levitation system that uses electromagnetic suspension and a propulsion system that uses SLIMs. The propulsion system of maglev trains using SLIMs has better low noise and dynamic characteristics compared with those using rotators. However, it has nonlinear characteristics due to the effect of slip that occur in the secondary eddy-current induction process; the normal force generated by the SLIM can negatively affect the levitation control. Therefore, a new slip-control algorithm is proposed for the safe operation of maglev trains, reflecting the normal force of the motor in propulsion control. First, the SLIM thrust and normal force are analyzed through the finite-element method (FEM) for a precise analysis of the slips. Furthermore, a slip range with a low normal force was derived based on the FEM analysis results, and these results are reflected in the propulsion control algorithm. Finally, the new algorithm was validated by an application to a full-sized testing apparatus.
The Transactions of the Korean Institute of Power Electronics, 2013
This paper proposes residential hybrid distribution system that can supply AC power and DC power ... more This paper proposes residential hybrid distribution system that can supply AC power and DC power to AC load and DC load at the same time. This hybrid distribution system consists of three parts: bidirectional inverter, step-up converter and step-down converter. Also that is used to supply voltage to home application is classified of AC load and DC load as load characteristics. The performance of proposed hybrid distribution system is validated through the hardware implementation and the experimental results.
The Transactions of the Korean Institute of Power Electronics, 2013
This paper proposes a mode transition algorithm between the grid-tied and the stand-alone operati... more This paper proposes a mode transition algorithm between the grid-tied and the stand-alone operations for the single-phase inverter with the energy storage system. For the grid-tied operation, the dc-link voltage and the output current are required to be control. For the stand-alone mode, both the output voltage and the output current should be regulated. In order to mitigate a falling-off in control performance during transients in mode change, the load power estimation and the current selection schemes are proposed. The proposed method allows an optimized current reference is selected to reduce an output voltage drop and an excessive over-current in transient. To verify the effectiveness of the proposed method, both the simulation and the experiments for a 3kW single-phase inverter with the energy storage system have been conducted. From the results, it has been confirmed that the proposed method reduces a transient error as well as implementing smooth mode transition.
The Transactions of the Korean Institute of Power Electronics, 2013
In this paper, bidirectional AC-DC converter using dual half-bridge converter is proposed. A tran... more In this paper, bidirectional AC-DC converter using dual half-bridge converter is proposed. A transformer leakage inductance in the dual half-bridge converter is used for making resonance with the capacitor of the voltage-doubler, which can help the switched current to be sinusoidal without extra inductive component and also the switching loss can be reduced through operation such as ZVS, ZCS. Both circuit analysis and design guideline are described, and also the feasibility for the proposed converter is shown through the hardware implementation and the experimental results.
This paper proposes a series arc fault detection algorithm which incorporates peak voltage and ha... more This paper proposes a series arc fault detection algorithm which incorporates peak voltage and harmonic current detectors for single-phase boost power factor correction (PFC) rectifiers. The series arc fault model is also proposed to analyze the phenomenon of the arc fault and detection algorithm. For arc detection, the virtual dq transformation is utilized to detect the peak input voltage. In addition, multiple combinations of low- and high-pass filters are applied to extract the specific harmonic components which show the characteristics of the series arc fault conditions. The proposed model and the arc detection method are experimentally verified through a boost PFC rectifier prototype operating under the grid-tied condition with an artificial arc generator manufactured under the guidelines for the Underwriters Laboratories (UL) 1699 standard.
2019 IEEE Energy Conversion Congress and Exposition (ECCE), 2019
Linear induction motors used in magnetic levitation (maglev) trains use a higher constant slip fr... more Linear induction motors used in magnetic levitation (maglev) trains use a higher constant slip frequency operating scheme than rotary motors to meet thrust and normal force requirements. Thus, the constant slip frequency is used in all operation conditions, which reduces the efficiency of the propulsion system. In this paper, a varying slip frequency control is proposed for increasing the propulsion efficiency within the limit of vertical force disturbance. The operation pattern of the actual train is defined by the route travel plan, which is adopted in simulation. The proposed varying slip frequency control pattern is verified by the actual maglev train test. With the proposed algorithm, efficiency consumption is improved not only in the propulsion system but the total power in the maglev train operation.
Journal of Electrical Engineering & Technology, 2021
The optimal design of an electromagnetic machine requires enormous computation time and includes ... more The optimal design of an electromagnetic machine requires enormous computation time and includes multi-optima in a design area. Multimodal optimization is a useful method for multi-optima problems. In this paper, a novel multimodal algorithm, specifically a sub-domain algorithm with dynamic area sampling (SADAS), is proposed. A conventional kriging has a memory problem that occurs when increasing the grid density for resolution of interpolation. The SADAS solves this problem by using a sub-domain method. Furthermore, a novel sampling method, dynamic area sampling, is proposed to improve the capability of peak search and convergence speed. The validity of the SADAS is verified by test functions and it is applied to the optimal design of an interior permanent magnet synchronous motor for an electric bus.
This paper presents the analyses and experimental results of a single-sided linear induction moto... more This paper presents the analyses and experimental results of a single-sided linear induction motor (SLIM) thrust and normal force for the propulsion of semi-high-speed magnetic levitation (maglev) trains. These trains are composed of a levitation system that uses electromagnetic suspension and a propulsion system that uses SLIMs. The propulsion system of maglev trains using SLIMs has better low noise and dynamic characteristics compared with those using rotators. However, it has nonlinear characteristics due to the effect of slip that occur in the secondary eddy-current induction process; the normal force generated by the SLIM can negatively affect the levitation control. Therefore, a new slip-control algorithm is proposed for the safe operation of maglev trains, reflecting the normal force of the motor in propulsion control. First, the SLIM thrust and normal force are analyzed through the finite-element method (FEM) for a precise analysis of the slips. Furthermore, a slip range with a low normal force was derived based on the FEM analysis results, and these results are reflected in the propulsion control algorithm. Finally, the new algorithm was validated by an application to a full-sized testing apparatus.
The Transactions of the Korean Institute of Power Electronics, 2013
This paper proposes residential hybrid distribution system that can supply AC power and DC power ... more This paper proposes residential hybrid distribution system that can supply AC power and DC power to AC load and DC load at the same time. This hybrid distribution system consists of three parts: bidirectional inverter, step-up converter and step-down converter. Also that is used to supply voltage to home application is classified of AC load and DC load as load characteristics. The performance of proposed hybrid distribution system is validated through the hardware implementation and the experimental results.
The Transactions of the Korean Institute of Power Electronics, 2013
This paper proposes a mode transition algorithm between the grid-tied and the stand-alone operati... more This paper proposes a mode transition algorithm between the grid-tied and the stand-alone operations for the single-phase inverter with the energy storage system. For the grid-tied operation, the dc-link voltage and the output current are required to be control. For the stand-alone mode, both the output voltage and the output current should be regulated. In order to mitigate a falling-off in control performance during transients in mode change, the load power estimation and the current selection schemes are proposed. The proposed method allows an optimized current reference is selected to reduce an output voltage drop and an excessive over-current in transient. To verify the effectiveness of the proposed method, both the simulation and the experiments for a 3kW single-phase inverter with the energy storage system have been conducted. From the results, it has been confirmed that the proposed method reduces a transient error as well as implementing smooth mode transition.
The Transactions of the Korean Institute of Power Electronics, 2013
In this paper, bidirectional AC-DC converter using dual half-bridge converter is proposed. A tran... more In this paper, bidirectional AC-DC converter using dual half-bridge converter is proposed. A transformer leakage inductance in the dual half-bridge converter is used for making resonance with the capacitor of the voltage-doubler, which can help the switched current to be sinusoidal without extra inductive component and also the switching loss can be reduced through operation such as ZVS, ZCS. Both circuit analysis and design guideline are described, and also the feasibility for the proposed converter is shown through the hardware implementation and the experimental results.
This paper proposes a series arc fault detection algorithm which incorporates peak voltage and ha... more This paper proposes a series arc fault detection algorithm which incorporates peak voltage and harmonic current detectors for single-phase boost power factor correction (PFC) rectifiers. The series arc fault model is also proposed to analyze the phenomenon of the arc fault and detection algorithm. For arc detection, the virtual dq transformation is utilized to detect the peak input voltage. In addition, multiple combinations of low- and high-pass filters are applied to extract the specific harmonic components which show the characteristics of the series arc fault conditions. The proposed model and the arc detection method are experimentally verified through a boost PFC rectifier prototype operating under the grid-tied condition with an artificial arc generator manufactured under the guidelines for the Underwriters Laboratories (UL) 1699 standard.
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