基于虚拟同步机的新型固态变压器控制

Control Sheme of Novel Solid State Transformer Based on Virtual Synchronous Generator

针对一种新型固态变压器(SST)拓扑的并网策略进行研究,提出基于虚拟同步机(VSG)的SST并网控制策略。提出一种基于多脉整流技术的SST拓扑,基于新型SST拓扑设计了VSG控制方案,分析了VSG控制中直流母线电压的稳定问题。通过PSCAD/EMTDC仿真试验验证了基于新型SST拓扑的VSG并网控制的有效性;通过6 k V/100 k VA样机试验结果,验证了新型SST工作原理及消除网侧谐波电流的有效性。

Aimed at grid-tied control sheme of a novel topology solid state transformer （SST）, a virtual synchronous generator（VSG） based control sheme of SST was proposed. Firstly, a novel SST topology based on multl-pulse rectifier technology was proposed. And then, VSG based control sheme of the novel SST topology was investigated. The stability of DC bus voltage in VSG control was analyzed. Finally, the validations of the VSG based grid-tied control sheme was verified by the simulation results on a PSCAD/EMTDC model of the novel SST, and operating principles and harmonic elimination of the novel SST were verified by the experimental results on a 6 kV/ 100 kVA prototype.