Research on fault ride-through control strategy of grid-constructed inverter based on virtual speed dynamic regulation

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ZHAO Ping^1,2, DU Long¹, GONG Yan¹, LI Zhenxing^1,2

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Abstract

[Objective] The large-scale integration of renewable energy through inverters poses challenges to power system stability. Although the virtual synchronous generator (VSG) control can provide inertia and damping, excessive short-circuit current during grid faults may lead to loss of synchronism or disconnection. To address this, a fault ride-through strategy based on dynamic virtual speed regulation is proposed. [Methods] The transient characteristics of the VSG are analyzed to identify the cause of the overcurrent during grid faults. A dynamic virtual speed adjustment strategy is adopted to maintain power angle stability, an improved reactive power control loop is designed to support reactive power compensation, and a dual-loop voltage-current structure based on the balanced current method is used to ensure the three-phase balance of the output current. [Results] Matlab/Simulink simulation results demonstrate that during grid short-circuit faults, the virtual speed and power angle stabilize at rated values, the short-circuit current is limited to within 1.5 times the rated output current of the VSG, reactive power is provided according to national grid connection standards, the output current remains balanced across phases, and fault inrush currents are effectively suppressed. [Conclusions] Compared with conventional methods, the proposed strategy more effectively stabilizes virtual speed and power angle, better limits short-circuit current and suppresses inrush current, and provides faster transient response. It also ensures a balanced three-phase output current, contributing to the safe and stable operation of VSGs during power grid faults.

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ZHAO Ping, DU Long, GONG Yan, LI Zhenxing. Research on fault ride-through control strategy of grid-constructed inverter based on virtual speed dynamic regulation[J]. Electric Power Construction. 0

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