一种逆变电源并联均流控制策略

A current sharing control strategy for parallel operation of inverters

采用传统下垂控制策略的逆变器并联系统中,系统稳态时均流效果较差且并联系统暂态过程较长,影响了系统的可靠性和稳定性。文章在分析传统下垂控制的基础上,引入虚拟复阻抗将单台逆变器的输出阻抗变为纯阻性,然后改进传统下垂算法,提出一种阻性条件下PID结合PI功率下垂控制算法。并在MATLAB中做了仿真验证,仿真结果验证了方案的可行性和有效性。

In the parallel system of inverters with traditional droop control strategy,the current sharing effect is poor during steady-state operation,and the transient process of parallel system is long,which affects the reliability and stability of the system. After analyzing the traditional droop control,the output impedance of a single inverter is changed into pure resistance by introducing virtual complex impedance. And then,a power PID correction combined with PI control algorithm is proposed under the condition of resistive output impedance. The simulation is done in MATLAB,and the simulation results verify the feasibility and effectiveness of the proposed scheme.