The goal of the control strategy for three-phase pulse width modulation (PWM) rectifiers operating under unbalanced voltage conditions is to avoid ripple in the DC-link voltage and harmonics in the input AC currents. A stationary frame control scheme which regulates the instantaneous active power at the converter poles for minimizing of input/output harmonics is used. The design of the control loops involved in this control strategy is provided in this paper. Furthermore, a dynamic analysis of the PWM rectifier operating under balanced and unbalanced voltage operating conditions is performed. The analysis is supported by experimental results for a 20 kVA PWM rectifier prototype. Fast dynamic performance with small DC-link voltage ripple and input sinusoidal currents are obtained with this control scheme even under severe voltage dips operating conditions.
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机译:在不平衡电压条件下运行的三相脉冲宽度调制(PWM)整流器的控制策略的目标是避免直流母线电压中的纹波和输入交流电流中的谐波。使用固定框架控制方案,该方案可调节转换器极的瞬时有功功率,以最大程度地减少输入/输出谐波。本文提供了该控制策略所涉及的控制回路的设计。此外,对在平衡和不平衡电压运行条件下运行的PWM整流器进行了动态分析。 20 kVA PWM整流器原型的实验结果支持了该分析。即使在严峻的电压骤降工作条件下,采用这种控制方案也可以获得具有很小直流母线电压纹波和输入正弦电流的快速动态性能。
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