中文摘要：

为了提高UPS电源输出电压波形质量，建立了带隔离变压器的三相UPS状态空间解耦模型．根据PID控制的快速响应性和重复控制的无静差跟踪特性，提出了一种新型的三相UPS输出电压重复控制与PD复合控制的方案，并对控制系统进行了稳定性分析．改进型重复控制器结构简单，易于实现．试制了30KVA三相UPS样机，主控制器为32位DSPTMS320F2812．实验结果表明了在线性和非线性负载情况下，系统均具有良好的稳态和动态特性，输出电压总谐波畸变（TI--ID）较小．

英文摘要：

In order to improve the waveform quality of the output voltage of Uninterruptible Power Supplies （UPS）, a decoupled status- space model was set up for three- phase LIPS with isolated transformer. Due to the fast response characteristic of PID control and the static error free tracking characteristic of repetitive control, a new control scheme combining repetitive control with PD control was proposed, and the stability of the control system was analyzed. The structure of the improved repetitive controller is simple and easy to implement. The prototype of 30KVA three-phase UPS has been manufactured, in which 32 bits DSP TMS320F2812 was applied as the controller. The good steady-state and dynamic-state performance of UPS system were verified by experi- mental results under linear and nonlinear loads. Total harmonic distortion （THD） of the output voltage is endurable.