中性点箝位电压型PWM逆变器中性点电位变化分析

Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting Pub Date : 1993-10-02 DOI:10.1109/IAS.1993.299015

Satoshi Ogasawara, Hirofumi Akagi

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引用次数: 290

摘要

分析了用于交流电机驱动和静态无功补偿器的中性点箝位电压源PWM(脉宽调制)逆变器(NPC-VSI)的中性点电位变化。分析了电流的变化，重点分析了直流线路中性点流出或流入的电流。讨论了直流链路电容的理论最小容量在2.2 kW矢量控制感应电机系统和10 MVA、6.6 kV、60 Hz的SVC系统中的应用。结果表明，所提出的控制方案可以将中性点电位的变化抑制在几个百分点以内，从而使NPC-VSI中直流链路电容的总容量与传统电压源逆变器中的电容的总容量几乎相同。

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Analysis of variation of neutral point potential in neutral-point-clamped voltage source PWM inverters

The authors present the analysis of the neutral-point potential variation of the neutral-point-clamped voltage source PWM (pulse-width-modulation) inverter (NPC-VSI) for AC motor drives and static VAr compensators (SVC). The potential variation is analyzed with the focus on the current flowing out of or into the neutral point of the DC link. The theoretical minimum capacity of the DC link capacitors is discussed for its application to both a vector-controlled induction motor system of 2.2 kW and a SVC system of 10 MVA, 6.6 kV, 60 Hz. It is shown that the proposed control scheme makes it possible to suppress the neutral-point potential variation within a few percent, so that the total capacity of the DC link capacitors in the NPC-VSI is almost the same as that in the conventional voltage source inverter.<>

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Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting

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