变电站直流电源并联均流控制方法

Parallel Current Sharing Control Method for Direct Current Power Supply in Substations

传统方法在变电站直流电源并联均流控制中的应用效果不佳,不仅直流电源并联均流度比较低,而且均流时间比较长,无法达到预期的控制效果,为此提出变电站直流电源并联均流控制方法。利用传感器拾取直流电源信号,并采用小波降噪技术对原始信号进行滤波处理,根据电源并联原理识别直流电源并联均流误差,利用变换器对存在误差的直流电源电压进行调整,消除均流误差,从而实现变电站直流电源并联均流控制。经实验证明,在设计方法应用下,直流电源并联均流度在95%以上,均流时间为0.21 s,设计方法在变电站直流电源并联均流控制方面具有良好的应用前景。

Due to the poor application effect of traditional methods in the parallel current sharing control of direct current power sources in substations,not only is the parallel current sharing degree of direct current power sources relatively low,but also the current sharing time is relatively long,which cannot achieve the expected control effect.Therefore,a parallel current sharing control method for direct current power sources in substations is proposed.Using sensors to pick up the direct current power signal,and using wavelet denoising technology to filter and process the original signal,the direct current power parallel current sharing error is identified based on the principle of power parallel connection.A converter is used to adjust the voltage of the direct current power supply with errors,eliminate the current sharing error,and achieve the direct current power parallel current sharing control in the substation.Through experiments,it has been proven that under the application of the design method,the parallel current sharing degree of the direct current power supply is above 95%,and the current sharing time is 0.21 s.The design method has good application prospects in the parallel current sharing control of the direct current power supply in substations.