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<p>This paper presents a new approach to improve the stability of microgrids, focusing on the issue of converter saturation. In microgrids that incorporate significant renewable energy sources, saturation can occur when current limits are exceeded, leading to system instability, oscillations, and poor power quality. These challenges are particularly severe during voltage sags, which prevent the converter from maintaining proper voltage and frequency regulation. To tackle this, a control strategy that combines model predictive control (MPC) with an innovative anti-windup technique, specifically designed to manage the limitations of proportional-integral (PI) controllers is proposed in this paper. The anti-windup mechanism ensures that the controller does not exceed the capacity of the converter, facilitating smooth recovery and preventing oscillations. This approach optimizes the power flow, minimizes overshoot, and stabilizes the system during voltage disturbances. The proposed control method is validated through hardware testing using a Typhoon HIL 402 setup, where a reduced DC voltage is used to simulate conditions that push converters into saturation.</p>

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Advance control technique for overcoming converter saturation problems and enhancing microgrid stability

  • 期刊论文

  • 发表日期：

    2025年10月16日

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  • Nikhil Chaudhary,
  • J. P. Pandey,
  • K. S. Verma

摘要

This paper presents a new approach to improve the stability of microgrids, focusing on the issue of converter saturation. In microgrids that incorporate significant renewable energy sources, saturation can occur when current limits are exceeded, leading to system instability, oscillations, and poor power quality. These challenges are particularly severe during voltage sags, which prevent the converter from maintaining proper voltage and frequency regulation. To tackle this, a control strategy that combines model predictive control (MPC) with an innovative anti-windup technique, specifically designed to manage the limitations of proportional-integral (PI) controllers is proposed in this paper. The anti-windup mechanism ensures that the controller does not exceed the capacity of the converter, facilitating smooth recovery and preventing oscillations. This approach optimizes the power flow, minimizes overshoot, and stabilizes the system during voltage disturbances. The proposed control method is validated through hardware testing using a Typhoon HIL 402 setup, where a reduced DC voltage is used to simulate conditions that push converters into saturation.