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...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。展开更多
To improve the harmonic suppression ability of multi-pulse rectifier,a 12-pulse rectifier based on zigzag autotransformer by DC side active compensation strategy is proposed.By controlling the small capacity current i...To improve the harmonic suppression ability of multi-pulse rectifier,a 12-pulse rectifier based on zigzag autotransformer by DC side active compensation strategy is proposed.By controlling the small capacity current inverter to generate compensating currents and injecting the currents directly into the DC side of the system,the grid-side currents of the rectifier can be approximated to sine wave.Using zigzag autotransformer as phase-shifting transformer can block the zero sequence current components and reduce the equivalent capacity of the rectifying system.The study on harmonic distortion rate of grid-side currents with the variation of the load shows that the harmonic content of the compensated rectifier decreases significantly under various load conditions.The harmonic content of the grid-side currents of the proposed active injection rectifier is only 1.17%,and the equivalent capacity of the rectifier is calculated.The results show that the rectifier can not only suppress the harmonic currents,but also have a lower equivalent capacity.展开更多
文摘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。
基金National Natural Science Foundation of China(No.51767013)Science and Technology Research and Development Plan of China Railway Corporation(No.2017J012-A)Lanzhou City Science and Technology Program for Innovation and Entrepreneurship of Talents(No.2017-RC-51)。
文摘To improve the harmonic suppression ability of multi-pulse rectifier,a 12-pulse rectifier based on zigzag autotransformer by DC side active compensation strategy is proposed.By controlling the small capacity current inverter to generate compensating currents and injecting the currents directly into the DC side of the system,the grid-side currents of the rectifier can be approximated to sine wave.Using zigzag autotransformer as phase-shifting transformer can block the zero sequence current components and reduce the equivalent capacity of the rectifying system.The study on harmonic distortion rate of grid-side currents with the variation of the load shows that the harmonic content of the compensated rectifier decreases significantly under various load conditions.The harmonic content of the grid-side currents of the proposed active injection rectifier is only 1.17%,and the equivalent capacity of the rectifier is calculated.The results show that the rectifier can not only suppress the harmonic currents,but also have a lower equivalent capacity.
