M. Vaziri

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Thomas Chase

North Carolina State University

Rahim Benekohal

Khandker Nurul Habib

University of Toronto

Mohammad Abu-Jaradeh

Zarqa University

Abdullah Kurkcu

New York University

Nagui Rouphail

North Carolina State University

Tanzina Afrin

Khulna University of Engineering and Technology

Bambang Tripoli

Universitas Teuku Umar

Kazimierz Jamroz

Cristiane Silva

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Papers by M. Vaziri

Modeling Highway Congestion Index for a Developing Country: The Iran Experience

Scientia Iranica, 2007

This paper describes an attempt to develop congestion indices for a developing country with a lim... more This paper describes an attempt to develop congestion indices for a developing country with a limited sampling. Speed and ow rate information was collected from urban highway trac ow videotaping in Iran. Video display provided information for trac modeling when, similar to most of the developing nations, Iran does not have locally developed highway capacity manuals. Processing of the extracted data and trac modeling provided free and capacity ow information for the selected freeway and principal arterial sections for the capital city of Tehran. The congestion indices were associated, in simple and logical models, with ve trac descriptive variables of travel speed, travel rate, delay rate, travel rate ratio and delay ratio, respectively. To calibrate the congestion index models, speci c congestion levels were assessed by the index values under free and capacity ow conditions. The functional forms used in congestion index modeling were derived from the congestion rate of change, s...

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Standards, rules, and issues for integration of renewable resources

IEEE PES General Meeting, 2010

The purpose of this paper is to gather and document the existing criteria, rules, and practices u... more The purpose of this paper is to gather and document the existing criteria, rules, and practices used by the Investor Owned Utilities (IOUs) in California for physical interconnection of Distributed Resources (DR). The criteria set by the National Standard IEEE 1547, State of California Public Utilities Commission (CPUC) Rule 21, and the standard practices used by a sample major IOUs will be presented and compared. Adequacy, practicality, and controversial implementation problems associated with the presently used rules and criteria will be documented and discussed. Suggestions and recommendations for future research and studies in the interest of practicality and implementation uniformity will be identified.

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Distribution Expansion Problem Revisited. Part 1 Categorical Analysis and Future Directions

Mathematical Programming, 2000

In this part, the problem is clearly defined from a practical point of view. A general multi stag... more In this part, the problem is clearly defined from a practical point of view. A general multi stage mathematical programming formulation of the problem addressing the shortcomings is presented. The complexity issues of this general formulation is also addressed and discussed. Finally, we propose a directed graph, minimum edge cost network flow modeling of the problem for a truly multi stage formulation that would guarantee global optimality. Results form a simple test case based on the proposed formulation is presented and analyzed.

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On the accuracy of approximating a class of NP-complete quadratic programs (QP) by a class of polynomially bounded linear programs (LP)

In this note we propose a class of linear programming (LP) problems that may be used to approxima... more In this note we propose a class of linear programming (LP) problems that may be used to approximate a class of quadratic programming (QP) problems that arise in some engineering related applications in particular here for the electric power system distribution expansion planning. We then derive an estimate on the QP optimum that may be computed using only the solution

Modeling and controlling 3D formations and flocking behavior of unmanned air vehicles

2011 IEEE International Conference on Information Reuse & Integration, 2011

Understanding slow voltage instability

Fuzzy type-2 electrode position controls for an Electric Arc Furnace

2012 IEEE 13th International Conference on Information Reuse & Integration (IRI), 2012

Photovoltaic systems interconnected onto secondary network distribution systems

2009 34th IEEE Photovoltaic Specialists Conference (PVSC), 2009

ABSTRACT While the number of PV systems interconnected to the electric grid has increased signifi... more ABSTRACT While the number of PV systems interconnected to the electric grid has increased significantly over the last decade, only recently have PV systems been installed in major metropolitan areas and tied to electric distribution secondary network systems (networks). This paper examines six cases studies of photovoltaic (PV) systems integrated into secondary network systems. The six PV systems were chosen for evaluation because they are interconnected successfully to secondary network systems located in four major U.S. Cities.

System information quantification Based on combinatory patterns

2011 IEEE International Conference on Information Reuse & Integration, 2011

Basic Theory and Practical Considerations in a Current Transformer

2007 IEEE Power Engineering Society General Meeting, 2007

In this paper, a brief discussion about the theory and the governing fundamentals of a current tr... more In this paper, a brief discussion about the theory and the governing fundamentals of a current transformer (CT) is presented. A classical modeling of the CT identifying the essential parameters is introduced and the basic formulas relating the CT voltage, current, burden, and their relationships have been discussed. Practical procedures for measuring the various burdens connected to a typical distribution circuits are analyzed. ANSI and IEC standards regarding CT types, accuracy class, characteristics, and burdens are compared. CT saturation has been addressed and examples showing simple analyses have been provided. Dynamic characteristics of a CT for generalized transient analyses have been introduced. Concluding remarks regarding practical approximations and guiding principles have been presented.

Kalman-Particle Filter Used for Particle Swarm Optimization of Economic Dispatch Problem

2012 IEEE Global Humanitarian Technology Conference, 2012

Effects of dispersed generation (DG) on distribution systems

IEEE Power Engineering Society General Meeting, 2005, 2005

The most common design of distribution systems is the 'radial' (single source with no l... more The most common design of distribution systems is the 'radial' (single source with no loops) configuration. This paper discusses some of the impacts caused by the interconnection of dispersed generation (DG) to a radial distribution system. Special considerations are placed on harmonics, loading concerns, voltage flicker, and voltage regulation.

California Smart Grid Attributes: California Public Utility Commission Metrics

2011 IEEE Green Technologies Conference (IEEE-Green), 2011

California regulatory agencies such as the California Public Utility Commission (CPUC) and state ... more California regulatory agencies such as the California Public Utility Commission (CPUC) and state energy policy and planning agencies such as the California Energy Commission (CEC) are continuing to launch a broad range of smart grid initiatives. Smart Grid refers to a nationwide modernization of the electric grid with design features meant to enhance security of U.S. energy infrastructure and help ensure reliable electricity delivery in the face of growing electrical energy demand [1]. The CPUC is tasked with adopting standards and protocols applicable to power delivery in general and to assist in the development of deployment plans for investor owned utilities (IOUs) in this emerging smart grid arena. Over many months the CPUC held numerous public workshops and garnered feedback from as wide an audience as possible so that a set of metrics can be created that specifically addresses a measureable smart grid. These proposed metrics must clearly show the rate payers the value of the smart grid in terms of utility rates, system reliability, environmental sustainability, and social justice across issues of income, race, geographic location, and other perceived needs. This paper presents a generalized view of the need for metrics and introduces some of the required details of Smart Grid metrics.

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Distributed generation issues, and standards

2011 IEEE International Conference on Information Reuse & Integration, 2011

The purpose of this paper is to investigate Distributed Generation (DG) standards and interconnec... more The purpose of this paper is to investigate Distributed Generation (DG) standards and interconnection issues at higher penetration levels. A clear concise definition of &quot;Smart Grid&quot; is presented to illustrate the importance of distributed generation along with the other important aspects of the Smart Grid vision. Specific standards are reviewed with particular focus on frequency and voltage. Major grid protection

Numerical Analyses of a Directed Graph Formulation of the Multistage Distribution Expansion Problem

IEEE Transactions on Power Delivery, 2004

In this paper, the numerical analysis of a multistage formulation of the distribution expansion p... more In this paper, the numerical analysis of a multistage formulation of the distribution expansion problem developed is presented. The approximate objective function is employed without sacrificing optimality. A complete nonlinear mathematical programming optimization is employed to identify the global optimum. The algorithm is applied here to two practical test cases. Details of the input data and configuration of test systems

Distribution expansion problem: formulation and practicality for a multistage globally optimal solution

… Society Winter Meeting, …, 2001

Page 1. Distribution Expansion Problem: Formulation and Practicality for a Multistage Globally Op... more

A directed graph formulation of the multistage distribution expansion problem

IEEE Transactions on Power Delivery, 2004

In this paper, the objectives and detailed analysis of the multistage distribution expansion are ... more In this paper, the objectives and detailed analysis of the multistage distribution expansion are presented. The problem is modeled as a directed graph minimum edge cost network flow problem. This new formulation details a multistage framework within a single mathematical program while addressing several deficiencies of previous approaches. The accuracy of a single step approximation of the objective function, without