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Three-Phase Optimal Power Flow for Study of PV Plant Distributed Impact on Distribution Systems

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Journal of Electrical Engineering 2017年第1期5卷 47-56页

作者： Malinwo E. Ayikpa Katia C. de Almeida Guilherme C. Danielski GSP-Labspot Department of Electrical Engineering Federal University of Santa Catarina 88040-900 Florianopolis SC Brazil

This paper presents a TOPF （three-phase optimal power flow） model that represents photovoltaic systems. The PV plant is modeled in the TOPF as active and reactive power source. Reactive power can be generated or absorbed using the available capacity and the adjustable power factor of the inverter. The reduction of unbalance voltage and losses in the distribution systems is obtained by actions of reactive power control of the inverter. The TOPF is formulated by current balance equations and the PV systems are modeled via an equivalent circuit. The primal-dual interior point method is used to obtain the optimal operating points for the systems for different scenarios of solar irradiance and temperature, thus providing a detailed view of the impact of photovoltaic distributed generation.

关键词： Three-phase optimal power flow photovoltaic generation unbalance voltage loss primal-dual interior point method.

Examination for Experimental Verification of Improvement of Power Quality in Distribution System by PCS

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Journal of Energy and Power Engineering 2014年第2期8卷 350-356页

作者： Shoji Kawasaki Naohiro Terada Hisao Taoka School of Science and Technology Meiji University Kanagawa 214-8571 Japan Power System Research Lab and Department of Engineering Electrical and Electronics Engineering University of Fukui Fukui910-8507 Japan

In the future, the power quality will decrease by the introduction of a lot of renewable energy sources. The topic of this research is a new method of operation of PCS （power conditioning systems） in the future distribution system. The purpose of this research is development of PCS with a function of improvement of the distribution system. Therefore, the authors propose a method of the power quality improvement of the distribution system by PCS. In addition, the authors construct the control logic to use in PCS The control logic suggests adding harmonic restraint function to conventional control. These were verified by simulation and an experiment. As the results, we confirmed that basic operation of PCS being carried out, harmonics were restrained, and power quality had improved.

关键词： Distributed generator harmonics voltage total harmonics distortion power conditioner system photovoltaic generation power quality.

Analysis of Influence and Contribution on Distribution System under Widespread PVs and EVs

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Journal of Mechanics Engineering and Automation 2015年第11期5卷 616-622页

作者： Shoji Kawasaki Shunsuke Fukami Department of Electronics and Bioinformatics School of Science and Technology Meiji University Kanagawa 214-8571 Japan

In recent years, against a background of an environmental problem and resource problem, the introduction of RES （renewable energy source） such as wind power generation and PV （photovoltaic generation）, EV （electric vehicle）, and PHEV （Plug-in hybrid electric vehicle） has been expanding. However, various problems have an ongoing discussion. When the production of electricity by RESs exceeds the power consumption, it is possible to cause a steep variation of point voltage and a deviation from a proper voltage range in a distribution system to which RESs are interconnected. When EVs and PHEVs have spread to the distribution system, a new peak power-demand and a steep voltage drop might occur in the midnight charging time zone in case the electricity charges are low. in this paper, the authors analyze the effects on the distribution system under widespread PVs, EVs, and PHEVs. In addition, the authors propose an improvement plan and analyze about the influence and contribution.

关键词： photovoltaic generation electric vehicle reverse power flow battery charge plug-in hybrid electric vehicle

Cooperative Voltage Control Method by Residential PV Systems in Distribution System

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Journal of Energy and Power Engineering 2016年第2期10卷 129-135页

作者： Shoji Kawasaki Masaaki Koyama Department of Electronics and Bioinformatics Meiji University Kanagawa 214-8571 Japan

Recently, the number of system interconnection of the renewable energy such as PV （photovoltaic） generation system and wind power generation system has been increasing drastically. A distribution system with the distributed generation must be operated keeping reliability of power supply and power quality. When high-capacity PV systems are interconnected to the distribution system, the system voltages may be deviated from the upper limit or lower limit of proper voltage in the distribution system. In this study, the authors propose a cooperative voltage control method of the distribution system by the power factor control of plural residential PV systems. In order to verify the validity of the proposal method, the numerical calculations are carried out by using an analytical model of distribution system which interconnected residential PV systems.

关键词： photovoltaic generation power quality voltage control distribution system power factor.

Research on User-side Distributed Power System Control Strategy

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Research on User-side Distributed Power System Control Strat...