Control strategy for DC capacitance of mine-used cascaded high voltage inverter
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摘要: 针对H桥逆变器级联型高压变频器母线电容体积大的问题，提出了一种在基波调制信号中注入三次谐波以减小母线电容容量的控制策略。在总调制比不变的情况下，三次谐波注入等价于将母线电容电流的低次谐波部分转化为高次谐波，从而减小了母线电压纹波。推导了母线电容电流谐波含量与三次谐波注入量的关系，并给出了不同功率因数下三次谐波最大注入量的表达式。Matlab/Simulink仿真结果表明，在功率因数为0.85的典型负载下，采用本文控制策略可将母线电容容量降低24.2%，验证了该控制策略的可行性和有效性。Abstract: In view of problem of large volume of DC capacitor of high voltage inverter cascaded in H-bridge type, a kind of control strategy to minimize DC capacitance by injecting the third-order harmonic into fundamental modulation signal was proposed. The DC capacitor voltage ripple was reduced because part of the low-order harmonic of DC capacitor current was equivalently converted to high-order harmonic when the total modulation index remained the same. The relationship of harmonic content of DC capacitor current and the third-order harmonic injection amount was derived, and the expression of the maximum third-order harmonic injection amount under different power factors was presented. Matlab/Simulink simulation results show that the DC capacitance achieves 24.2% reduction under typical load with 0.85 power factor, which verifies feasibility and effectiveness of the control strategy.
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Keywords:
- high voltage inverter /
- DC capacitor /
- third-order harmonic injection /
- typical load
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