Abstract
With the increasing scale of distributed photovoltaics (PVs) accessed to distribution networks, surplus power will be injected into the distribution network as PV power outputs exceed local load demands, which causes serious voltage violation problems. However, this violation problem could be eliminated by PV inverters themselves due to their fast and flexible adjustment of active and reactive power outputs. In this article, a novel voltage control structure combining the local and central control of PV inverters is proposed to address the voltage violation in the distribution network with scattered PVs. Firstly, based on the analysis of voltage regulation with PVs, the control structure of PV inverters for voltage violation elimination is built. Then, using the forecast of PV outputs, the optimization method based on genetic algorithm (GA) is implemented to select and switch control states of PV inverters while deciding the optimal PV active and reactive power outputs. Finally, the simulation model is built and results indicate that the proposed method can adjust the network voltages collaboratively and effectively.
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