断路器并联动态合闸电阻对滤波器合闸涌流的抑制效能研究

Study on the Suppression Efficacy of Filter Closing Inrush Currents by Shunt Dynamic Closing Resistor of Circuit Breaker

断路器并联合闸电阻是抑制换流站交流滤波器合闸涌流的常用措施之一,运行经验表明,若合闸电阻为定值电阻,则其对合闸涌流的限制作用并不十分理想,为此,该文提出了断路器并联动态合闸电阻的涌流抑制方案。以天山换流站为工程背景,搭建了滤波器合闸涌流仿真计算模型,针对HP24/36、BP11/13、HP3及SC 4种典型滤波器,结合选相合闸、动作持续时间等因素,研究了线性动态电阻及非线性动态电阻对合闸涌流的抑制效能,并分析了其对滤波器主电容电压应力的影响。研究结果表明,动态电阻对滤波器涌流的抑制效果明显优于定值电阻,同时也有效限制了滤波器主电容的电压幅值;综合动态电阻4种阻值衰减趋势下的涌流及电压响应特性,提出了动态电阻阻值的最优变化规律。

The circuit breaker shunt closing resistor is a common method used to reduce the inrush current of the AC filter in converter stations.However,it has been observed that a fixed-value resistor does not effectively limit the inrush current.This article proposes a scheme for suppressing inrush current in circuit breakers using parallel dynamic closing resistors to address this issue.The study focuses on the Tianshan converter station and builds a simulation model to calculate the filter closing inrush.The effectiveness of linear and nonlinear dynamic resistors in suppressing the inrush current is analyzed for four filters(HP24/36,BP11/13,HP3,and SC).The study also considers factors such as phase selection closing and action duration,as well as the impact on the voltage stress of the filter's main capacitor.The results demonstrate that dynamic resistors have a significantly better suppression effect on the filter's inrush current than fixed-value resistors.They also effectively limit the voltage amplitude of the filter's main capacitor.Based on the characteristics of the four resistance attenuation trends,the article proposes an optimal change in the resistance of the dynamic resistor.