HVDC系统中调相机与逆变侧关断角协调控制

为有效抑制故障消除后引起的HVDC受端系统过电压,提出了一种调相机与逆变侧关断角协调控制的策略,在逆变侧关断角固定的常规控制系统中加入无功调节器(QPC),通过调节逆变侧关断角实现对换流站的无功控制,同时协调整定调相机无功调节器和直流控制系统无功调节器的参数。基于PSCAD/EMTDC搭建含调相机的HVDC系统数值仿真模型,仿真结果表明,提出的调相机与逆变侧关断角协调控制策略可有效降低故障后HVDC受端系统过电压,加快交流系统电压的恢复时间。

Coordinated control of synchronous condenser and extinction angle of inverter side in HVDC system

To effectively suppress the overvoltage of HVDC receiving end system caused by the fault elimination, a coordinated control strategy of synchronous condenser and inverter side extinction angle is proposed. A reactive power regulator (QPC) is added to the conventional control system with a fixed extinction angle at the inverter side for realizing the reactive power control of the converter station by adjusting extinction angle at the inverter side, and at the same time coordinating the reactive power regulator parameters of both the synchronous condenser and the DC control system. The numerical simulation model of HVDC system with the synchronous condenser is built based on the PSCAD/EMTDC environment. The simulation results show that the coordinated control method can effectively reduce the overvoltage of HVDC receiving end system after the accident occurrence and speed up the recovery time of the AC system voltage.