直流系统控制方式对大扰动后交直流混合系统电压和功率恢复的影响

使用电力系统暂态安全评估工具TSAT基于南方电网2005年规划数据研究了直流控制方式和低压限流器参数对大扰动后交直流混合系统电压和功率恢复的影响.结果表明,常规的整流侧定电流、逆变侧定直流电压控制比整流侧定功率、逆变侧定熄弧角控制有利于大扰动后交流换流母线电压的恢复;为缓解大扰动后有功功率和无功功率失衡的问题,低压限流器参数的大小应取折中值.

INFLUENCE OF DC SYSTEM CONTROL MODES ON VOLTAGE AND POWER RECOVERY AFTER LARGE DISTURBANCE IN HYBRID AC/DC SYSTEMS

Using Transient Security Assessment Tool (TSAT) and according to the planned data of South China power grid for the year of 2005, the influence of DC system control modes and the parameters of voltage dependent current order limiter (VDCOL) on voltage and power recovery after large disturbance in hybrid AC/DC systems was researched. The research results showed that the conventional constant current control at rectifier side and constant DC voltage control at inverter side were more propitious to the recovery of converter AC bus voltage after large disturbance than constant power control at rectifier side and constant extinction angle control at inverter side. To mitigate the unbalance of both active power and reactive power after large disturbance, the parameters of VDCOL should be chosen as their compromise values.