主从控制变流器电压比例分离控制策略

Voltage Proportional Separation Control Strategy of Master-slave Control Converter

主从控制的并联变流器在发生通信丢包时,若负载突变则会造成主从机不均流甚至过流停机。此处提出一种电压比例分离控制策略,主机电压环采用比例积分(PI)控制,其中比例控制器参数分离为稳态比例项和动态比例项;从机增加电压环控制,采用比例控制器且参数与主机动态比例项相同。首先对主从变流器系统进行建模,在此基础上提出电压比例分离控制策略,进一步分析了该策略的均流原理。实验结果表明所提策略能有效解决通信丢包下主从控制变流器的不均流问题,验证了所提策略的正确性和实用性。

When communication packet loss occurs in parallel converters with master-slave control,if the load sudden-ly changes,it will cause uneven current sharing or even overcurrent shutdown of the master and slave.A voltage pro-portional separation control strategy is proposed.The voltage loop of the master adopts a proportional integral(PI)con-trol,in which the proportional controller coefficient is separated into steady-state proportional coefficient and dynamic proportional coeficient.The slave adds a voltage loop control using a proportional controller with the same coefficient as the dynamic proportional coefficient of the master.Firstly,the master-slave converter system is modeled.Based on this,the voltage proportional separation control strategy is presented,and the current equalization principle of the strat-egy is further analyzed.The experimental results show that the proposed strategy can effectively solve the uneven cur-rent sharing problem of master-slave control converters under the condition of communication packet loss,which veri-fies the correctness and practicability of the proposed strategy.