基于测试信号的直流小信号调制器参数整定

提出一种基于测试信号的直流小信号调制器参数整定方法。首先用测试信号法分析交直流系统的低频振荡特性；然后在直流系统整流侧定电流调节器电流参考环节对测试信号进行频率扫描，激发并联交流联络线有功功率振荡，通过时域仿真和频域分析，辨识开环传递函数；最后基于经典控制理论的根轨迹法整定直流小信号调制器参数。理论分析和算例仿真结果均表明所提出的方法能够方便、有效地应用于直流小信号调制器参数整定,并能应用于实际交直流大系统。而且，该方法易于用一般的机电暂态仿真软件实现，并可用于FACTS小信号调制器参数整定。

PARAMETERS TUNING OF HVDC SMALL SIGNAL MODULATION CONTROLLERS BASED ON TEST SIGNAL

A new method is put forward to tune parameters of a HVDC small signal modulation controller. First, small signal stability of an AC/DC power system is analyzed using the test signal method. Then test signal is scanned at the HVDC rectifier current set point, as a result, the active power flow in the parallel AC tie line is oscillated. After time domain simulations using electromechanical transient analysis programs, the open-loop transfer function between the current reference signal of the HVDC constant current regulator and the active power flow in the parallel AC tie line is identified by Fourier resolution and curve fitting. Finally, parameters of the HVDC small signal modulator are tuned based on root locus rules of the classical control theory. Simulation results show that the proposed parameter tuning method is effective and convenient, and it can be used in a practical large AC/DC power system. Also it can be employed to tune parameters of small signal modulators of FACTS. Furthermore, this method can be easily implemented by electromechanical transient analysis programs.