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辅助系统并联是辅助变流器的发展趋势。然而辅助系统具有复杂的负载特性,这就要求辅助并联系统能够处理复杂负载特性。为了解决泵类负载启动时的过电流使并联系统输出电压严重跌落的问题,该文提出了电压补偿策略。对于不平衡负载下三相相角差不能维持120°,文中采用统一的无功下垂和独立的有功下垂克服此问题。针对非线性负载下谐波电流难以均分,该文提出结合低通滤波器和高通滤波器的阻性虚拟阻抗技术。最终,并联系统在泵类负载、不平衡负载及非线性负载下都能均分负载电流。
Auxiliary system parallel auxiliary converter is the trend. However, auxiliary systems have complex load characteristics, which requires auxiliary parallel systems to handle complex load characteristics. In order to solve the problem that the output current of the parallel system drops seriously when the overcurrent of the pump load starts, a voltage compensation strategy is proposed. For unbalanced load phase angle difference can not be maintained at 120 °, the article uses a uniform reactive droop and independent active drooping to overcome this problem. It is difficult to divide the harmonic current under nonlinear load. This paper presents a resistive virtual impedance technique combining low-pass filter and high-pass filter. In the end, the parallel system is capable of equally dividing the load current under pump loads, unbalanced loads and non-linear loads.