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Enhanced Control Structure for Voltage Source Converters Under Unbalanced Grid Voltages
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DOI：10.1109/OJPEL.2026.3702384.png)
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Abstract
En 中文
This paper presents an enhanced control structure for Voltage Source Converters (VSCs) operating under unbalanced grid conditions. Conventional dq control schemes suffer from increased total harmonic distortion (THD) as well as active-power and DC-voltage oscillations under unbalanced grid voltages. The proposed control strategy incorporates a novel reference compensator that dynamically adjusts the current references by injecting tailored oscillatory components according to the selected Control Objective. This enables the converter to independently achieve one of three mutually exclusive goals: (I) balanced grid currents, (II) elimination of active power oscillations, or (III) suppression of DC voltage oscillations. This is accomplished without the need for additional negative-sequence control loops, resonant filters, or observers. The control is validated in both inverter and rectifier modes, ensuring harmonic-free grid currents and compliance with modern grid codes. Furthermore, the system integrates an active power curtailment mechanism to prioritize reactive power injection and the chosen Control Objective. Simulation and experimental results confirm the effectiveness of the proposed method under various scenarios, including harmonic distortion and mode transitions. The control structure is suitable for converters of different power and voltage ratings, providing a scalable solution to improve power quality in distribution networks with high penetration of renewable energy sources.
Keywords:
Unbalanced grid voltages
voltage source converters (VSCs)
dq control
harmonic-free grid currents
elimination of DC voltage and active power oscillations
low THD
power curtailment
Journal
I
IF:
3.9
Papers:
609
Citations:
1.2K
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