Low Voltage Ride Through Coordination Control Strategy of DFIG with Series Grid Side Converter

Xin Qi, Can Ding (), Jun Zhang, Quan Wang and Wenhui Chen
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Xin Qi: China Electric Power Research Institute Wuhan Branch, Wuhan 430074, China
Can Ding: College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443000, China
Jun Zhang: China Electric Power Research Institute Wuhan Branch, Wuhan 430074, China
Quan Wang: China Electric Power Research Institute Wuhan Branch, Wuhan 430074, China
Wenhui Chen: College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443000, China

Energies, 2025, vol. 18, issue 10, 1-17

Abstract: The present study investigates the control strategy of a novel doubled-fed induction generator (DFIG) with a series grid-side converter (SGSC) during grid faults. The rotor-side inverter is subject to a control strategy derived from the Model Predictive Current Control (MPCC) theory, which is implemented during periods of fault occurrence; for the series grid-side converter, the positive and negative sequence component control is implemented during both steady state and fault periods to enhance system stability and performance. The proposed coordinated control strategy is implemented on a doubly fed turbine with SGSC, while taking into account different degrees of symmetric and asymmetric faults to further evaluate the efficacy of the proposed method. The results of the simulations demonstrate the efficacy of the model-predictive current control scheme applied to the rotor-side converter under conditions of asymmetric faults. This enables the suppression of a range of phenomena, including rotor overcurrent, stator overcurrent, and overvoltage, electromagnetic torque ripple, and DC bus voltage during low-voltage ride-through (LVRT), among others. The present study confirms the viability of implementing positive and negative sequences of voltage separation control in the SGSC during both grid faults and steady state. This approach is expected to minimize the switching of SGSC control strategies and thereby reduce output power fluctuations. The Rotor Side Converter (RSC) and SGSC can perform coordinated control during faults, and the proposed method is able to improve low-voltage ride-through performance compared to existing methods, thereby preventing damage to the converter under multiple fault conditions.

Keywords: SGSC (series grid-side converter); positive and negative sequence voltage separation; MPCC (model predictive current control); LVRT (low voltage ride through); DFIG (doubly fed induction generator) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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