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<p>Vector current control (VCC) is widely used in grid-connected voltage source inverters (VSIs) but suffers from stability issues under weak grid conditions due to phase-locked loop (PLL) limitations. To address this, this paper proposes a voltage-modulated dead-beat direct power control (VM-DB-DPC) strategy, eliminating the PLL and enhancing system robustness. By leveraging grid voltage modulation for phase synchronization, the proposed method ensures accurate power tracking without relying on conventional PLLs. Additionally, a band-pass filter extracts the fundamental voltage component to mitigate harmonic disturbances, while a dead-beat control algorithm improves the power response speed. Compared to traditional VCC, the proposed method achieves a 38% reduction in power response time and a 37% decrease in total harmonic distortion (THD), significantly enhancing power quality, grid synchronization, and transient stability under weak grid conditions. Unlike conventional direct power control (DPC) strategies, it removes PLL dependency while ensuring stable power tracking under low short-circuit ratio (SCR) scenarios. However, practical implementation may require careful tuning of the band-pass filter parameters to adapt to different grid conditions. Simulation and hardware-in-the-loop (HIL) experiments validate the effectiveness of the proposed method, demonstrating improved dynamic response, lower THD, and enhanced robustness against grid disturbances.</p>

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Voltage-modulated dead-beat direct power control strategy for voltage source inverters connected to weak grids

  • 期刊论文

  • 发表日期：

    2025年10月11日

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  • Xing Li,
  • Yiding Sun,
  • Long Zhang,
  • Kepaiyitulla Tursun,
  • Guanchu Chen,
  • Zhangyong Chen,
  • Yong Chen,
  • Fuchuan Ding

摘要

Vector current control (VCC) is widely used in grid-connected voltage source inverters (VSIs) but suffers from stability issues under weak grid conditions due to phase-locked loop (PLL) limitations. To address this, this paper proposes a voltage-modulated dead-beat direct power control (VM-DB-DPC) strategy, eliminating the PLL and enhancing system robustness. By leveraging grid voltage modulation for phase synchronization, the proposed method ensures accurate power tracking without relying on conventional PLLs. Additionally, a band-pass filter extracts the fundamental voltage component to mitigate harmonic disturbances, while a dead-beat control algorithm improves the power response speed. Compared to traditional VCC, the proposed method achieves a 38% reduction in power response time and a 37% decrease in total harmonic distortion (THD), significantly enhancing power quality, grid synchronization, and transient stability under weak grid conditions. Unlike conventional direct power control (DPC) strategies, it removes PLL dependency while ensuring stable power tracking under low short-circuit ratio (SCR) scenarios. However, practical implementation may require careful tuning of the band-pass filter parameters to adapt to different grid conditions. Simulation and hardware-in-the-loop (HIL) experiments validate the effectiveness of the proposed method, demonstrating improved dynamic response, lower THD, and enhanced robustness against grid disturbances.