Transient Stability Computation For Power System Containing FACTS Devices

This paper analyses model and control system of UPFC and TCSC, and respectively completes interface with network, UPFC using equivalent load decoupled algorithm and TCSC using compensation algorithm. By programming software, transient stability computation for power system containing FACTS devices can is realized. The correctness and effectiveness are proved using numerical example in the modified EPRI-36 bus system. Computaion results indicate that UPFC has strong regulation capability of power flow and voltage, and TCSC has strong regulation capability of line flow. Using the Non-sequential Monte-Carlo Simulation, this paper also researches the effect on probabilistic stability of system containing UPFC under random faults. Through analysis of instability probabilistic indices (PLOS) ,it is found that in different installation site ,or with different control system parameters ,or using different control strategies , the effects of FACTS to hybrid power system are different. Therefore, how to further develop advantages of FACTS elements is the emphasis of the future work.The research work is financially supported by the National Natural Science Foundation of China (NSFC) under the grant No.59977004, the Natural Science Foundation of Anhui Province under the grant No.00104421 and doctor-point financially supported by the Education Ministry of China.