一种基于主动电压扰动的直流微网负载均流控制策略

With the rapid development of new energy power generation technology, load current-sharing control and bus voltage control of the multiple parallel DC converters have attracted wide attention. Most of the load current-sharing methods depend on the communication between DC converters or system level communication, which have low reliability and bring about bus voltage dropping. In this paper, a load current-sharing control strategy based on active voltage disturbance is proposed. The method does not need communication. The DC converter obtains load information according to the output state change before and after the disturbance. Accordingly, the load current-sharing is achieved and the bus voltage is compensated to the rated value. By establishing the simulation and experimental platforms, the load current-sharing effect before and after the load changing is analyzed. The method uses active disturbance, which has little influence on power quality and is controllable. The results verify the effectiveness of the current sharing strategy.