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Dr. Shinya Yoshizawa and Akihisa Kaneko give Power and Energy Seminar on Aug. 31

Dr. Shinya Yoshizawa and Akihisa Kaneko of Waseda University in Japan will give the weekly Power and Energy Seminar on Friday, Aug. 31st from 12:20 pm to 1:10 pm in MHK 404.  Also available via ZOOM (info at bottom of page).

Presenter: Dr. Shinya Yoshizawa, Waseda University, Japan

Title: Experimental Evaluation of Volt-VAR Control of Smart Inverter in a LV-distribution System by Using Hardware Testbed

Abstract: Voltage regulation in a distribution system is important to maintain a reliable electric power supply to customers. However, the number of photovoltaic (PV) systems, especially residential PVs, connected to a distribution system has been growing, and their effects on the voltage regulation in the distribution systems have been reported. Recently, The Electric Power Research Institute (EPRI) summarized multiple functionalities for frequency and voltage regulation in transmission and distribution system as a smart inverter. Several demonstration projects have already been started in Hawaii, California, and Japan.

This presentation will share the smart inverter demonstration project in which Waseda University has been participating. The presentation will also share a hardware testbed constructed to analyze smart inverters’ functionalities, especially distribution systems support such as fixed power factor, volt-VAR, and volt-Watt, and the results comparing with the conventional PV inverters.

Bio: Shinya Yoshizawa received B.E., M.E., and D.E. degrees in Electrical Engineering and Bioscience from Waseda University, Japan, in 2011, 2013, and 2016, respectively. In April 2016, he became a research associate at Waseda University, Japan. He is an assistant professor at the Department of Electrical Engineering and Bioscience, Waseda University. His research interests include the operation, control, and energy management systems of active distribution systems and smart grids.

Presenter: Akihisa Kaneko, Waseda University, Japan    

Title: A Practical Determination Method for LDC-Control-Parameters of OLTC and SVRs in Distribution Networks with PV Systems

Abstract: Recently, distributed system operators have needed to upgrade the voltage regulation to conform with the massive photovoltaic (PV) system interconnection. This presentation indicates a practical determination method for the line drop compensator (LDC)-control-parameters of on load tap changer (OLTC) and step voltage regulator (SVR) using the measured data by switches with sensors. LDC-control logic is widely utilized for tap operations of OLTC and SVRs and the voltage control performance of LDC-control depends on the LDC-control parameters, which consist of resistance , reactance  and reference voltage. In an existing determination method, the parameters are calculated based on the relationship between sending voltage and absolute of current at secondary side of OLTC/SVR with a fixed power factor. However, the power factor will change due to the interconnection of PV systems into distribution networks. Hence, in the proposed method, LDC-control-parameters are determined by the relationship between active current, reactive current and sending voltage to consider power factor fluctuations. In other word, the parameters are determined by drawing the LDC-control-parameters plane. The plane is drawn based on the large voltage rise and drop situations in measured data. The effectiveness of the proposed method was verified by the numerical simulation using distribution system model with PV. In the results, the proposed method could improve the amount of voltage violation by 67% compared to an existing method.

Bio: Akihisa Kaneko received his B.E. and M.E. degrees in electrical engineering and bioscience from Waseda University, Tokyo, Japan in 2016 and 2018. He is currently a Ph.D. student in the department of electrical engineering and bioscience in Waseda University. His research interests include cooperative controls of distributed energy resources and electric power systems.

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