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中文摘要：
为了提高UPS输出电压波形质量，根据PID控制器的快速响应性和重复控制器的无静差跟踪特性，提出了一种新型的单相UPS输出电压复合控制的方案，改进型重复控制器只需检测UPS输出电压，结构简单，易于实现，试制了10kVA单相UPS样机，实验结果表明了在线性和非线性负载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（THD）较小。
英文摘要：
In order to improve the waveform quality of the output voltage of uninterruptible power system （UPS）, this paper proposes a new combined control scheme for the single-phase UPS based on the fast response characteristic of PID controller and the static error free tracking characteristic of repetitive controller. The improved repetitive controller needs only to detect the output voltage of UPS, so its structure is simple and easy to implement. The prototype of 10kVA single-phase UPS has been manufactured. Experimental results verify the good steady state and dynamic state performance of UPS system under linear and nonlinear loads.
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