Voltage Stability Index based Synchronous Condenser Capacity Configuration Strategy of Sending EndSystem Integrated Renewable Energies

Large-scale renewable energy integrated to the power system will lead to transient voltage instability. This paper investigates capacity configuration of synchronous condenser for a sending end system integrated renewable energy model to improve its transient voltage stability. Following the overview of the sending end system and model of synchronous condenser, two comprehensive index of transient voltage stability for sending end system integrated with high penetration renewable energy are proposed, which combines both transient voltage stability and transient voltage instability risk. The transient voltage stability index is measured by the maximum and minimum value and duration of the transient voltage, and the transient voltage instability risk index is measured by the time-voltage area. Considering the proposed comprehensive index together with the economic cost as optimization objective, an optimization model is formulated to configurate the capacity of synchronous condenser, which is solved with Cplex solver. Finally, the case study verification is carried out on a high voltage direct current based sending end system with high penetration of renewable energies. Simulation results verify that the optimized capacity configuration of synchronous condenser can improve transient voltage stability of the system effectively.