微网供电逆变器功率系统优化控制仿真

The Optimized Control Simulation for the Micro-Grid Supply Inverter Power System

微网供电逆变器中的功率半导体器件及其控制电路是最易发生故障的薄弱环节,逆变器一旦发生故障会导致整个系统不能正常工作,它的可靠性问题一直没有得到有效解决。为了提高微网供电系统的可靠性,提出了一种带容错逆变器的微网系统及其优化控制策略。首先给出了微网系统的拓扑结构,分析了其四种工作模式。所提容错逆变器提高了故障容错空间。提出了脉冲信号重置,结合下垂三环控制,形成容错逆变器的控制方法。分析了容错逆变器处于故障状态时,两台逆变器之间的环流问题及抑制方法。给出了微网供电系统的总体控制策略。通过仿真验证了带容错逆变器的微网供电系统拓扑结构和控制策略的正确性,提高了微网供电系统的可靠性。

The power devices and the corresponding control circuit are the weakest parts in the micro-grid supply inverter. Once some faults occur in the inverter, the whole system will not work normally, and ts reliability cannot be solved effectively. In order to improve the system reliability, a micro-grid system with the fault tolerant inverter and the corresponding control scheme were proposed in the paper. The topology structure of the micro-grid system with the fault tolerant inverter was given firstly. Four operating modes of the system were analyzed. The fault tolerant inverter can be reconfigured if the power semiconductors in difference arms were fault, which can broad the fault space. The operating principles were analyzed for the fault tolerant inverter. A pulse signal reconstruction was proposed, combined with the droop-voltage - current three loops control, the control strategy for the fault tolerant inverter was formed . The loop current and the corresponding suppressing method were analyzed when the fault tolerant inverter was under fault condition. The general control scheme for the micro-grid system waaas presented. The simulating results verify the feasibility of the micro-grid structure and the control scheme. The reliability of the micro-grid system is improved.