ABSTRACT This paper reports on the improvement of a photovoltaic power conditioning system (PCS), which is one of the renewable energy sources, to a grid forming (GFM) control type, and the successful results obtained from laboratory tests conducted on a 20 kW apparatus. Because it is a voltage‐controlled type, it always synchronizes with the AC system, including generators, through synchronizing power. This increases the short circuit capacity of the system and contributes to the suppression of voltage fluctuations. Additionally, having virtual‐inertia characteristics and frequency droop characteristics enhances the inertia of the AC power system and contributes to the suppression of frequency fluctuations. With such features, it is expected that it will be one solution to the challenges of the power system that may concern the increase of renewable energy in the future.
Arai et al. (Tue,) studied this question.