Upgrading Voltage Control Method Based on Photovoltaic Penetration Rate

• Published in: IEEE transactions on smart grid Vol. 9; no. 5; pp. 3994 - 4003
• Main Authors: Akagi, Satoru, Takahashi, Ryo, Kaneko, Akihisa, Ito, Masakazu, Yoshinaga, Jun, Hayashi, Yasuhiro, Asano, Hiroshi, Konda, Hiromi
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01.09.2018; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Computer simulation; Control methods; Energy sources; Line drop compensator (LDC); Numerical models; on-load tap changer (OLTC); Penetration; photovoltaic (PV) system; Photovoltaic cells; Photovoltaic systems; Reactive power; Solar cells; static var compensator (SVC); Static VAr compensators; Step voltage; step voltage regulator (SVR); Voltage control; Voltage measurement
• DOI: 10.1109/TSG.2016.2645706
• ISSN: 1949-3053

In this paper, we propose a comprehensive scheme to determine a suitable method and timing for upgrading the voltage control method. Voltage control methods are expected to be upgraded in accordance with the photovoltaic (PV) penetration in distribution systems. The suitable method and timing detailed in this paper are based on the limit of the PV penetration rate, which is constrained by the regulated voltage deviation. The upgrade process involves moving the on-load tap changer (OLTC) control method from the conventional scalar line drop compensator (LDC) method to the vector LDC method or centralized control method. Then, a static var compensator (SVC) or step voltage regulator (SVR) is installed. The locations of the SVR and SVC are determined to maximize the PV penetration rate. The suitable method and timing are demonstrated using a general distribution system. In addition to the numerical simulations, experiments are performed using an active network system with energy resources. The experimental results are consistent with the numerical simulation results, thus validating the proposed scheme. The maximum PV penetration rate obtained using the OLTC control method is 55%. Whereas, the installation of the SVR and SVC increased the rate to 95% and 100%, respectively.