基于电容电压的并联UPS系统自主控制策略

针对并联不间断电源(UPS)系统的均流控制问题,设计了一种新的并联UPS系统自主控制策略.新方案可用于多个三相在线UPS模块的并联电流分配控制.每台UPS控制器将滤波电容的电压参考设计为其自身输出电流的函数进行调节,无需逆变器之间信息交换即可实现自主均流控制.同时,控制器还保证了负载电压的控制精度以及负载扰动下的动态性能.利用两台UPS为主体构成的实验平台对所设计的新型自主控制方案进行了测试.实验结果表明,在不同负载条件下,包括阶跃负载和非线性负载工况下控制器均具有较好的控制效果.

Autonomous Control Strategy of Parallel UPS System Based on Capacitor Voltage

Aiming at the current sharing control problem of parallel uninterruptible power supply (UPS) system, a novel autonomous control strategy for parallel UPS system was designed. The new scheme can be used for parallel current sharing control of multiple three-phase online UPS modules. Each UPS controller was based on regulating the voltage reference of the filter capacitor as a function of its own output current, enabling independent current sharing control without the need for information exchange between the inverters. At the same time, the controller also guaranteed the control accuracy of the load voltage and the dynamic performance under load disturbance. The experimental platform composed of two UPSs was used to test the new autonomous control scheme. The experimental results show that the controller had good control effects under different load conditions, including step-load and nonlinear load.