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Improved DPWM Strategy for Effective Reduction of Common-mode Current in Photovoltaic Inverter
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Liangcai WU, Lei GE, Yang YU
Journal of Power Supply | 2026, 24(3) : 316 - 323
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Journal of Power Supply | 2026, 24(3): 316-323
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Improved DPWM Strategy for Effective Reduction of Common-mode Current in Photovoltaic Inverter
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Liangcai WU, Lei GE, Yang YU
Affiliations
  • Shenzhen Growatt New Energy Co., Ltd., Shenzhen 518101, China
Published: 2026-03-30 doi: 10.13234/j.issn.2095-2805.2026.3.316
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The discontinuous pulse width modulation (DPWM) method can effectively reduce the switching loss and improve the system efficiency. However, it will also bring in high-order common-mode voltage, which results in an decline in the quality of grid current and an increase in the common-mode current (CMC). To solve this problem, a novel DPWM method is proposed, which can reduce the content of common-mode voltage in the modulation wave by injecting third-order sinusoidal signals into the wave under the traditional DPWM1 modulation at the clamping stage. A common-mode loop model of a photovoltaic inverter system is established, and the reason of the increasing CMC under the DPWM modulation is theoretically explained. The theoretical analysis and experimental results show that the proposed novel DPWM method can improve the efficiency of the photovoltaic inverter system while ensuring that the THDi and CMC are similar to those under the SVPWM modulation. As a result, good current quality and high efficiency are maintained simultaneously.

Common-mode current (CMC)  /  discontinuous pulse width modulation (DPWM)  /  photovoltaic inverter
吴良材, 葛磊, 于洋. 一种可有效降低光伏逆变器共模电流的改进型DPWM策略. 电源学报, 2026 , 24 (3) : 316 -323 . DOI: 10.13234/j.issn.2095-2805.2026.3.316
Liangcai WU, Lei GE, Yang YU. Improved DPWM Strategy for Effective Reduction of Common-mode Current in Photovoltaic Inverter[J]. Journal of Power Supply, 2026 , 24 (3) : 316 -323 . DOI: 10.13234/j.issn.2095-2805.2026.3.316
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Year 2026 volume 24 Issue 3
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Article Info
doi: 10.13234/j.issn.2095-2805.2026.3.316
  • Receive Date：2023-11-09
  • Online Date：2026-10-29
  • Published：2026-03-30
Article Data
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History
  • Received：2023-11-09
  • Revised：2024-01-06
  • Accepted：2024-01-28
Affiliations
    Shenzhen Growatt New Energy Co., Ltd., Shenzhen 518101, China
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