考虑调相机饱和参数的分阶段励磁控制优化策略

针对常规励磁控制在故障期间未能充分发挥调相机暂态无功输出能力和难以准确有效地支撑电网电压的问题，提出考虑调相机饱和状态下电机参数的分阶段励磁控制优化策略。首先，推导调相机暂态无功输出表达式，分析不同运行工况下饱和参数对调相机暂态无功特性的影响。其次，基于调相机参数与输出无功的数学关系引入考虑饱和参数的无功增量，分阶段优化励磁环节中内环电压参考值与外环PI控制。最后，建立锡盟-泰州特高压直流输电系统的无功控制模型，通过仿真验证励磁控制策略优化效果。研究成果为调相机的优化设计提供技术支撑，也对提高调相机的电网电压故障支撑能力和提升我国高压直流电网的电压稳定水平具有重要作用。

Optimization strategy of phased excitation control considering phase modulator saturation parameters

There is a problem that conventional excitation control fails to make full use of the synchronous condenser transient nonfunction during the fault period. Also it is difficult to accurately and effectively support the voltage of the power network. Thus a staged excitation control optimization strategy considering the saturation parameters of the transformer is proposed. First, the expression of the transient reactive power output of the phase modulator is deduced, and the influence of saturation parameters and different operating conditions on the transient reactive power characteristics are analyzed. Second, based on the mathematical relationship between condenser parameters and output reactive power, reactive power increment considering saturation parameters is introduced to optimize the reference value of inner ring voltage and outer ring PI control in excitation links in stages. Finally, the reactive power control model of the Ximeng-Taizhou UHVDC transmission system is established, and the optimization effect of the excitation control strategy is verified by simulation. The results provide technical support for the optimal design of the phase modulators, and also play an important role in improving the power grid voltage fault support capacity of the phase modulators and the voltage stability level of China''s HVDC power network.