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介绍一种新型的多级注入式电流源变换器,这种变换器主桥实现了零电流切换,消除开关损耗的同时降低了对吸收回路的要求,简化了变换器与交流系统的连接,在换向期间网侧不需要大容量的交流电容。建立了基于多级注入式电流源变换器的STATCOM的数学模型,对STATCOM的非线性数学模型进行局部线性化。通过分析给出了控制策略框图,利用PSCAD/EMTDC对所建模型进行仿真,结果表明,该结构的STATCOM具有良好的动态、稳态特性,并验证了所提出控制策略的可行性。
A new type of multi-stage current source converter is introduced. The main bridge of this converter realizes zero-current switching, reduces the switching losses and reduces the requirements of the absorption circuit, simplifies the connection between the converter and the AC system. Network side during the commutation does not require large-capacity AC capacitor. The mathematical model of STATCOM based on multi-stage current source converter is established, and the nonlinear mathematical model of STATCOM is locally linearized. The block diagram of the control strategy is given through the analysis and the simulation results of the model are shown by PSCAD / EMTDC. The results show that the STATCOM has good dynamic and steady state characteristics and the feasibility of the proposed control strategy is verified.