Distributed Synchronous Condenser Configuration Method Based on Capacity Gradient Optimization

The high proportion of new energy sources connected to the grid reduces the system's voltage support capability, thereby resulting in operational risks in the power generation network. Distributed synchronous condensers (DSCs) are gradually being deployed at scale in new energy stations due to their dynamic reactive power support capability, which can effectively enhance the system's short-circuit capacity. This study focuses on improving voltage support capability and optimizing the configuration of DSCs. Firstly, based on the multiple renewable energy stations short circuit ratio (MRSCR) index, the impact mechanism of DSC access on MRSCR is analyzed. Two key influencing factors, installed capacity and grid-connected equivalent reactance, are extracted to analyze the evolution law of the MRSCR in different scenarios. Then, considering the constraints of site space, DSC capacity diversity, and the requirements for safe power grid operation, a DSC configuration method based on capacity gradient optimization is proposed. It can significantly improve the MRSCR index while satisfying the safety constraints of the power grid. Based on system simulation analysis of a large-scale new energy base in an actual power grid, the DSC configuration method proposed in this paper can effectively improve the MRSCR of the power grid. Compared to the configuration method based on the lowest short-circuit ratio, the proposed method significantly reduces the total required DSC capacity.