H桥级联式SSSC阻抗补偿域及准稳态模型

根据电压源模型及电流源模型的各自特点,提出了在数学分析中将外接系统等效为电流源模型,而在仿真中采用电压源模型的静止同步串联补偿器(SSSC)电力系统分析等效方法.根据调制比的变化规律,计算出了考虑稳态最大允许电流的H桥级联式SSSC在不同调制方式下的阻抗补偿域.计及直流侧电压波动及脉冲触发时刻,推导了在一定参考阻抗下H桥级联式SSSC输出电压的准稳态数学模型.最后,通过RTDS及EMTDS/PSCAD仿真及实验验证了计算结果的正确性.

Impedance Compensation Domain and Quasi-Steady State Model of H-Bridge Cascaded SSSC

According to the characteristics of voltage source model and current source model, the conclusion is drawn in this paper, that is the external system should be equivalent to different models depending on different situations, namely the current source model can be used for mathematical analysis, but it's more suitable to adopt voltage source model in simulation for static synchronous series compensator (SSSC). The impedance compensation domains considering the steady state maxium allowable current in cascaded SSSC structure at different modulation indices is also obtained from the view of impedance compensation domain. In addition, the quasi-steady state model for single-phase output voltage taking into account the rule of DC voltage fluctuation and triggering time is deduced in the paper. Finally, the calculation results are justified by RTDS, PSCAD simulations and experiments.