基于实际工程控制系统的直流受扰特性分析—电压快速波动下整流端特性及其优化

Analysis on Disturbance Characteristics of HVDC Based on Actual Engineering Control System—Disturbance Characteristics of Rectifier Side and Its Optimization

为降低直流扰动引发的电压波动、提升风机并网安全，基于PSD—BPA电力系统机电暂态仿真软件中新近开发的面向实际工程的直流控制系统，分析了送端整流侧交流电压快速波动下直流系统主要电气量的动态响应特性；揭示了整流站动态无功盈余及其引发交流过电压威胁的机制；评估了交流电压扰动特征、直流控制器参数配置对响应特性的影响；提出了直流控制参数优化措施。对于新能源规模化并网特高压直流汇集送出系统，降低整流器最小触发角限制器动作幅度、增大定电流控制总增益以及减小低压限流启动门槛值，均可改善交直流电网受扰特性，降低风电脱网威胁。

In order to reduce the voltage fluctuation caused by HVDC disturbance, and enhance the safety of grid con- nected wind turbines, on the basis of the control system simulation model of HVDC aiming to the practical engineering which was newly developed in PSD-BPA power system electromechanical transient simulation software, we analyzed the dynamic response characteristics of the main electric quantity of the HVDC system under the AC voltage disturbance at the rectifier side. Then we evaluated the effects of different AC voltage disturbance characteristics and HVDC controller parameters on the response characteristics, revealed the mechanism of overvoltage threat because of the reactive surplus of rectifier station, and put forward the relevant optimization measures. For the multi-HVDC transmission system, it was verified that the disturbance characteristics can be improved and the security can be increased by decreasing the magni- tude of RAML, increasing the gain coefficient of current controller, and decreasing the boot threshold of VDCOL.