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首先分析了工业级10 k V/1 MVA等级统一电能质量调节器(unified power quality conditioner,UPQC)串联侧滤波器设计方法,分析了RLC滤波器与LCL滤波器的性能优劣,并最终选择RLC滤波器作为UPQC串联侧滤波器。其次从振荡谐波源的产生、滤波器传输系统的放大过程以及控制环节的反馈3个方面分析了RLC滤波器引起逆变器谐振甚至失稳现象的机理,并基于该分析结果从反馈控制角度提出了有源阻尼控制策略。最后在UPQC的实际物理控制器中增加有源阻尼控制环节,并基于实时数字仿真仪(real time digital simulator,RTDS)进行闭环测试,实验结果验证了所提策略的有效性。
Firstly, the design method of serial power filter (UPQC) in 10k V / 1 MVA grade is analyzed, and the performance of RLC filter and LCL filter is analyzed. Finally, RLC Filter as UPQC series side filter. Secondly, the mechanism of RLC filter’s resonance or even instability caused by the inverter is analyzed from three aspects: the generation of the oscillating harmonic source, the amplification process of the filter transmission system and the feedback of the control link. Based on the analysis results, Active damping control strategy is proposed. Finally, the active damping control is added to the actual physical controller of UPQC, and the closed-loop test is carried out based on real time digital simulator (RTDS). The experimental results verify the effectiveness of the proposed strategy.