Reactive Power Planning Method for High-Penetration Wind-PV Hybrid Grid-connected System Considering Transient Voltage Stability

To address the issue that transient voltage cannot be stabilized solely by the system's own reactive power regulation capability after faults occur at some weak nodes in high-penetration wind-photovoltaic hybrid grid-connected system, a dynamic reactive power planning method considering transient voltage stability for high-penetration wind-photovoltaic hybrid grid-connected system is proposed. Based on the system's own reactive power regulation capability, this method constructs a reactive power planning benchmark scenario using typical output scenarios of wind power and photovoltaic power, and determines the installation locations and compensation capacities of the dynamic reactive power compensation devices through multiple power flow calculations. Key fault nodes are identified using transient voltage stability recovery index to preliminarily determine the system's weak nodes. On this basis, sensitivity index are used to determine the installation nodes for dynamic reactive power compensation devices. An optimization model for dynamic reactive power planning is established with the objective of improving system transient voltage stability at the lowest investment cost for dynamic reactive power compensation devices. The compensation capacities at reactive power compensation nodes are optimized using a Particle Swarm Optimization algorithm based on Differential Evolution.