机车电源测试用交流并网型直流电子负载的研究

Study of Locomotive Power Test and AC Grid-connected DC Electronic Load

讨论了由移相全桥和全桥逆变器为主要拓扑结构的能量回馈型直流电子负载的工作原理及其控制策略。为了电子负载整机效率前级电子负载的模拟采用移相全桥拓扑结构,后级逆变采用H桥结构实现交流并网。在控制策略上移相全桥采用电流-电流双闭环的控制方式,对并网逆变器采用新颖的电压外环、单极性单周期电流内环的控制策略。最后利用Matlab软件对上述的控制策略进行仿真验证,仿真表明该种控制策略是可行的,并且能够获得良好的跟踪、抗干扰等性能。最后,小功率实验验证了理论分析的正确性和控制策略的可行性。

Discussed the phase-shifted full-bridge and full-bridge inverter topology for the main works whichconstituted regenerative DC electronic load and its control strategy. In order to improve the overall efficiency of analogelectronic pre-load electronic load using phase-shifted full-bridge topology,used H-bridge inverter after the classstructure to achieve the AC grid. In the phase-shifted full-bridge control strategy,used a current-current doubleclosed-loop control mode,for grid-connected inverter,adopted novel outer voltage control strategy with unipolarsingle-cycle current inner loop. Finally,using Matlab software,simulated above control,simulation results show thatthis type of control strategy is feasible and can get a good tracking,anti-jamming performance. Finally,low-powerexperiments validate the feasibility of the theoretical analysis and control strategy.