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<p>The conventional three-level inverter lacks voltage boosting capability and necessitates measures to balance the neutral point voltage. When the DC voltage is low, a series DC boosting link may be required, which increases system costs and control complexity. To address this issue, this paper proposes a new topology of a three-level inverter with 2-time voltage boosting capability. The topology uses two complementary zero-current switching circuits to charge the DC link capacitors in turn, keeping the voltage of each capacitor near the DC power supply voltage while limiting the magnitude of the charging current. In this way, the inverter can achieve a voltage gain of 2 on the DC side, and balance the neutral point voltage without the need for other balancing measures. Furthermore, since the power switches are turned on and off with zero current, it can minimize additional switching losses. Experimental results verify the effectiveness and feasibility of the proposed topology and control strategy.</p>

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Topology and control method of double boost 3-level inverters

  • 期刊论文

  • 发表日期：

    2025年8月25日

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  • Liping Zhong,
  • Shuiping Zhang

摘要

The conventional three-level inverter lacks voltage boosting capability and necessitates measures to balance the neutral point voltage. When the DC voltage is low, a series DC boosting link may be required, which increases system costs and control complexity. To address this issue, this paper proposes a new topology of a three-level inverter with 2-time voltage boosting capability. The topology uses two complementary zero-current switching circuits to charge the DC link capacitors in turn, keeping the voltage of each capacitor near the DC power supply voltage while limiting the magnitude of the charging current. In this way, the inverter can achieve a voltage gain of 2 on the DC side, and balance the neutral point voltage without the need for other balancing measures. Furthermore, since the power switches are turned on and off with zero current, it can minimize additional switching losses. Experimental results verify the effectiveness and feasibility of the proposed topology and control strategy.