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针对大容量非线性负载的谐波补偿问题,提出了一种模块化有源电力滤波器并联组合系统。研究了多模块并联组合系统的结构及其工作原理,在此基础上建立小信号模型加以分析,并引入模块容量差异化情况下的控制策略作为对比,提出了相同容量模块间基于均流系数实时更新的均流控制及冗余控制策略。各个模块内则采用数字比例—积分(PI)和重复控制构成的复合电流控制策略,保证系统的稳态补偿精度和动态响应速度。最后,搭建了单台容量为50kVA的双模块有源电力滤波器并联组合系统,对比了不同模块间控制策略及不同模块内控制策略的补偿效果,实验结果证明了所提出的控制策略的可行性和有效性。
Aiming at the harmonic compensation problem of large capacity non-linear load, a modular parallel combination system of active power filter is proposed. In this paper, the structure and working principle of multi-module parallel combination system are studied. Based on this, a small signal model is established and analyzed, and the control strategy with module capacity difference is introduced as a contrast. Updated current sharing control and redundancy control strategy. In each module, digital proportional-integral (PI) and repetitive control are adopted to control the complex current, which ensures the steady-state compensation accuracy and dynamic response speed of the system. Finally, a parallel combination system of dual-module active power filter with capacity of 50kVA is built, and the compensation effect between different control strategies and different control strategies is compared. The experimental results show that the proposed control strategy is feasible And effectiveness.