Optimal Configuration of Synchronous Condenser to Suppress High Voltage Tripping of Renewable Energy Generators in DC Sending-End Power System

Great risk of high voltage tripping of renewable energy generators exists due to the faults in DC sending-end system with high proportion of renewable energy. To decrease the transient voltage stability accidents, small capacity condensers can be installed in renewable energy stations and renewable energy collecting stations. First of all, the applicability of the condenser configuration scheme in multi scenarios and faults is considered. Secondly, the optimal site selection method of condenser based on the transient voltage rise severity index of bus and system is proposed. Thirdly, with the aim of minimizing the comprehensive configuration cost containing the operation and maintenance cost of synchronous condenser, the condenser capacity optimization model is constructed. The transient voltage stability constraint representing the actual demand of restraining high voltage tripping of new energy generators is considered. Then, the optimal configuration scheme is obtained by using particle swarm optimization (PSO) algorithm. Finally, the proposed method was used to obtain the synchronous condenser configuration scheme of one Western province power grid in China.