柔性变电站双向DC-DC变换器自主均流控制研究  

Research on Autonomous Current Sharing Control of Bidirectional DC-DC Converter in Flexible Substation

作　　者：王世君[1] 郝泉 李文龙[1] WANG Shijun;HAO Quan;LI Wenlong(State Grid Jibei Electric Power Co.,Ltd.Chengde Power Supply Company,Chengde 067000,Hebei,China)

机构地区：[1]国网冀北电力有限公司承德供电公司,河北承德067000

出　　处：《电气传动》2022年第16期49-54,共6页Electric Drive

基　　金：国家电网公司科技项目(SGNX0000DKJS1900460)。

摘　　要：针对现有方法对柔性变电站双向DC-DC变换器自主均流控制时存在运行波形不稳定、输出电流应力高和负载瞬时波动差等问题,提出了基于三维调制的柔性变电站双向DC-DC变换器自主均流控制方法。利用三维调制法对变换器中电容电压进行调节,平衡DC-DC变换器中电容电压;通过双移相(DPS)法分析变换器电流应力特性,计算外移相角获取变换器的电流占空比;最后通过获取变换器的电流占空比,完成了柔性变电站双向DC-DC变换器的自主均流控制。实验结果表明:所提方法可提升双向DC-DC变换器的电流运行波形稳定性,降低电流应力,改善负载瞬时波动。In view of the problems of unstable operation waveforms,high output current stress and instantaneous fluctuation difference of load in the current sharing control of two-way DC-DC converter in flexible substation,a method of independent current sharing control of two-way DC-DC converter in flexible substation based on three-dimensional modulation was proposed.Three dimensional modulation method was used to adjust the capacitor voltage in DC-DC converter to balance the capacitor voltage in DC-DC converter.Dual phase shift(DPS)method was used to analyze the current stress characteristics of the converter and calculate the phase shift angle to obtain the current duty cycle of the converter.Finally,by acquiring the current duty cycle of the converter,the independent current sharing control of the two-way DC-DC converter in flexible substation was completed.The experimental results show that the proposed method can improve the current waveform stability of bidirectional DC-DC converter,reduce the current stress and improve the load transient fluctuation.

关 键 词：三维调制 柔性变电站 自主均流控制 变换器 输出电流 

分 类 号：TM93[电气工程—电力电子与电力传动]