无功控制在南桥换流站的应用

Reactive Power Control at NANQIAO

葛南直流控制保护系统在运行15年后进行了全面改造,无功控制有较大改进,根据优先级原则,防止部分交流滤波器组因故被切除后造成运行中的其它交流滤波器谐波过负荷,通过无功控制保证系统与换流站之间交换的无功功率在现有电网允许的范围内,通过投/切交流滤波器维持稳态交流电压在过压保护动作的水平以下,大大提高了交、直流输电系统的可靠性。

GENAN HVDC control protection system has been reconstructed overall after 15 years running. The control of reactive power has been improved. According to priority principle, when partial AC filter groups are shut down, the new system should be protected the other AC filter groups which are still running from the harmonic overload. By the reactive power control, the reactive power, which is exchanged between the AC system and the converter station, is ensured in the permissible range. The steady state AC voltage, is maintained under the action level of the overvohage protection by starting and shutting down the AC filter. All of these improve the reliability the AC and DC system greatly.