基于电压源等效的构网型储能变流器幅值饱和限流模式暂态稳定性分析OA

Grid-forming voltage source converters(GFM-VSCs)offer reliable supports for the fault ride-through capa-bility of renewable energy generators.While current-limiting(CL)control degrades the system's transient stability during the fault.Traditional transient stability analysis for GFM-VSCs with amplitude-saturated current limiters predominantly relies on the current-source equivalent models.Such models not only fail to reveal changes in physical meaning induced by the mode switching during CL,but also struggle to analyze the influence mechanism of voltage control schemes and current limiters on transient stability.To address this issue,a transient stability analysis method for GFM-VSCs with cur-rent limiters is proposed based on the voltage-source equivalent model.From the perspective of equivalent system impedance,the influence mechanism of current limiters with different priorities on the power characteristics and system stability is systematically analyzed.The results show that,for GFM-VSCs with virtual admittance voltage control,the current limiters realize current suppression and phase shift by adjusting the magnitude and angle of the system impedance.Specifically,the impedance angle plays a dominant role in affecting the transient stability margin,by elevating or de-pressing the power characteristic during CL.Comparative analysis shows that the converter with the q-axis priority current limiters exhibits the largest impedance angle and stability margin,whereas the converter with the d-axis priority limiters has the smallest ones.Simulation results validate the accuracy of the proposed model and the correctness of the theoretical analysis.