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Method for zero-sequence damping and voltage balancing in a three-level converter with split dc-link capacitors and virtually grounded LCL filter
Method for zero-sequence damping and voltage balancing in a three-level converter with split dc-link capacitors and virtually grounded LCL filter
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机译:具有分流直流链路电容器和虚拟接地LCL滤波器的三电平转换器中零序阻尼和电压平衡的方法
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摘要
A method and an apparatus implementing the method for an arrangement comprising a three-phase, multi-level invertern (11), an output LCL-filter (12) connecting the inverter to a grid (13), and a virtual-ground connection between the LCL-filter and the neutral point of the DC-link (l,m). The method comprises determining a zero-sequence component of an LCL-filter inverter-side current (i 1³ ), calculating a zero-sequence damping and balancing voltage term (e* ³ ) on the basis of the LCL-filter inverter-side current zero-sequence component and voltages over the two halves of the DC-link (v c1 , v c2 ), and adding the zero-sequence damping and voltage balancing term to the output voltage reference (e* ±² ).
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