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Positive Effect of PV's Constant Leading Power-Factor Operation in Power System
Ishimaru, Masaaki,Komami, Shintaroh The Korean Institute of Electrical Engineers 2013 The Journal of International Council on Electrical Vol.3 No.3
Overvoltage problem due to highly penetrated photovoltaic power generation (PV) has been regarded as the foremost concern in distribution network. To find an economical solution for the problem, the authors focus in the inherent ability of present distribution network and PV, and examine whether PV's "Constant Leading Power-Factor Operation" can mitigate the overvoltage problem enough or not. Simulation based on accurate distribution system model, which is aggregated from many loads/PV using "Y-connection" aggregation method, has revealed that combination of PV's "Constant Leading Power-Factor Operation" and distribution transformer's "Line voltage Drop Compensator (LDC)" has important positive effects for solving the problem. Distribution system voltage is kept within the statutory voltage. Frequency of PV output restriction due to overvoltage is reduced. Frequency of tap change on on-Load Tap Changer (LTC) and Step Voltage Regulator (SVR) is also reduced. In addition, no negative effects are recognized in trunk power system.