【摘要】 为了抑制由牵引网谐波电压和直流侧脉动电压引起的单相PWM整流器网侧低次谐波电流,提出陷波器和比例谐振控制相结合的控制算法。电压外环中后置N次陷波器,讨论了陷波器的设计和离散方法,消除直流侧脉动电压的影响。电流内环采用具有抗电网频率波动和相角补偿的比例谐振控制器,通过根轨迹法设计基频比例谐振控制器的参数,根据幅频特性设计谐波谐振控制器,分析电流内环对交流信号的控制能力。仿真验证了该算法正确性和可行性。更多还原

【Abstract】 In order to suppress the low-order harmonic current caused by the grid harmonic voltage and the DC pulsating voltage in the single-phase PWM rectifier, a control algorithm combining the DC-link voltage notch filter and the proportional resonance control was proposed. The N-order notch filters was placed on the back of the voltage loop, and the notch filter design and discretization method was discussed to achieve the elimination of DC-side pulse voltage interference. Proportional resonant controllers with anti-grid frequency fluctuation and phase angle compensation was adopted in current inner loop. The parameters of the fundamental frequency proportional resonant controller were designed by the root locus method, and the harmonic resonant controller was designed by using the amplitude-frequency characteristic to analyze the control ability of current loop to the AC signal. The correctness and feasibility of the algorithm were validated by simulation.更多还原