Effects on Frequency Stability of Power System for Photovoltaic High-Penetration Ratio Grid-Connected Power Generation

In this paper, the effects of three typical operation modes, namely short-circuit fault, load change, and chemical energy storage on frequency a regional power grid after photovoltaic asynchronous interconnection were studied with different penetration ratios, taking in Northern Henan Province as research object. It was found that an increase ratio, maximum value system fluctuation amplitude gradually increased, became less stable. With peak at corresponding node valley decreased. load, curve When photoelectricity connected to through storage, stability during fault change significantly improved. Compared before reduced approximately one tenth original. case when changed, decreased quarter