A Study on the Multiple FACTS Control for Ensuring the Voltage Stability in Jeju Island System

Abstract

Voltage instability results from a lack of reactive power support in a power system. One effective solution for supplying reactive power to a power system is utilization of flexible alternating-current transmission system (FACTS) facilities. Currently, two FACTS facilities are operated for stable operation of the power system on Jeju Island in South Korea. Both FACTS respond to disturbances to stabilize voltage fluctuations in the island power system, however there is potential for mutual interference between them because they are operated using measured voltage without a coherent system operation strategy; cooperative control between the two would result in more effective system operation. Here, a multiple FACTS control algorithm is developed for effective operation of the island power system. The algorithm is based on two methods: calculation of the effective reactive power (Q) reserve (EQR) to obtain an accurate reactive power for the system, and GV analysis to account for the two HVDC interconnections between Jeju Island and the Korean Peninsula.