Research on compound current control strategy based on LCL type active power filter
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摘要: 针对传统电流控制策略存在高稳态精度与快速动态响应的矛盾，提出了一种基于LCL型有源电力滤波器的复合电流控制策略。该控制策略将比例积分控制和重复控制有机结合，在保证动态响应的基础上，利用PI控制器将控制模型补偿为稳定系统，使其在低频段具有良好的控制特性；利用重复控制器校正LCL型滤波器谐振峰和内环的固有相位滞后，实现电网谐波电流的快速跟踪与高精度补偿。实验结果表明，经过并联有源电力滤波器的谐波补偿，电网电流的总谐波失真明显减小，负载变化时并联有源电力滤波器可实现单周期快速响应，验证了所提出的复合电流控制策略的有效性。Abstract: In view of contradiction between high steady state accuracy and fast dynamic response of traditional current control strategy, a novel compound current control strategy based on LCL type active power filter was proposed. The control strategy combines proportional integral control and repetitive control, the PI controller is used to ensure fast dynamic response, and further compensate control model to the stable system, which has good control characteristics in low frequency range; the repetitive controller is used to correct resonance peak and PI-inner-loop inherent phase lag of LCL filter, so as to realize fast tracking and high precision compensation on harmonic current of the power grid. The experiment results show that total harmonic distortion of the grid current is significantly reduced by compensating of shunt active power filter and the single-cycle fast response is achieved when the load changes, which verifies the compound current control strategy is effective.
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期刊类型引用(2)
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2. 王伟. 基于卡尔曼滤波和加权LM法的井下精确定位算法. 工矿自动化. 2019(11): 5-9 . 本站查看
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