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SYSTEM AND METHOD FOR CONTROLLING A BACK-TO-BACK THREE-LEVEL CONVERTER WITH VOLTAGE RIPPLE COMPENSATION
SYSTEM AND METHOD FOR CONTROLLING A BACK-TO-BACK THREE-LEVEL CONVERTER WITH VOLTAGE RIPPLE COMPENSATION
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机译:用电压纹波补偿控制背靠背三电平转换器的系统和方法
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摘要
A method for controlling a back-to-back three-phase three-level converter having a grid-side AC/DC converter and a machine-side DC/AC converter connected by a split DC link which defines a DC link midpoint. The method includes controlling the grid-side converter to convert AC power from a grid into DC power of the DC link, controlling the machine-side converter to convert DC power from the DC link to AC power to feed a low frequency machine, and concurrently performing common mode voltage injection for the machine-side converter so as to at least partially compensate midpoint voltage ripple caused by the machine-side converter. The method further includes performing common mode voltage injection for the grid-side converter so as to at least partly further compensate the portion of the midpoint voltage ripple which remains uncompensated by controlling the machine-side converter. A control system implementing the control method and a power conversion system utilizing same.
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