基于直接式AC/AC变换的单相混合式配电变压器及其松弛二端口网络建模  

Direct AC/AC Conversion Based Single-phase Hybrid Distribution Transformer and Its Relaxed Two-port Network Modeling

作　　者：王艺博[1] 蔡国伟[1] 刘闯[1] 郭东波 张瀚文 朱炳达 WANG Yibo;CAI Guowei;LIU Chuang;GUO Dongbo;ZHANG Hanwen;ZHU Bingda(School of Electrical Engineering,Northeast Electric Power University,Jilin 132012,Jilin Province,China)

机构地区：[1]东北电力大学电气工程学院,吉林省吉林市132012

出　　处：《电网技术》2020年第8期3029-3037,共9页Power System Technology

基　　金：国家自然科学基金面上项目(51877035)。

摘　　要：针对配电网中的电压波动问题,提出了一种由传统工频变压器与电力电子变换器组合而成的混合式配电变压器(hybrid distribution transformer,HDT)。首先,在不同HDT拓扑分析的基础上,选取了具有一定结构优势的双极性直接式AC/AC变换器(bipolardirectAC/ACconverter,BD-AC)作为HDT的电力电子组成部分;其次,对HDT的拓扑结构与运行原理进行了分析并提出了相应的控制策略;再次,基于状态空间平均法构建了HDT的状态空间平均模型,并以松弛二端口网络理论为依托,对HDT的系统特性进行了理论分析;最后,通过搭建仿真系统验证了理论分析的合理性与有效性。Aiming at the problem of voltage fluctuation in distribution network, a hybrid distribution transformer(HDT) composed of the traditional power frequency transformer and the power electronic converter is proposed in this paper. First, on the basis of different topological analysis of HDT, the bipolar direct AC/AC converter(BD-AC) with certain structural advantages is selected as the power electronic component of HDT. Then, the topological structure and operation principle of the HDT are analyzed and the corresponding control strategy is proposed. Next, the averaged state-space model of HDT is constructed based on the averaged state-space method, and with the theory of relaxed two-port network, the system characteristics of HDT are analyzed. Finally, the rationality and effectiveness of the theoretical analysis are verified by building a simulation system platform.

关 键 词：电压柔性调控 混合配电变压器 拓扑结构 直接式AC/AC变换器 松弛二端口网络 状态空间平均模型 

分 类 号：TM721[电气工程—电力系统及自动化]