微电网混合型联网变压器及其故障阻隔协调控制  

Hybrid interlinking transformer and its fault blocking coordination control for microgrid

作　　者：尹昕 赖锦木 尹项根[3] 王要强[2] 尹越 胡家玄 YIN Xin;LAI Jinmu;YIN Xianggen;WANG Yaoqiang;YIN Yue;HU Jiaxuan(School of Automation,Wuhan University of Technology,Wuhan 430070,China;School of Electrical and Information Engineering,Zhengzhou University,Zhengzhou 450001,China;School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]武汉理工大学自动化学院,湖北武汉430070 [2]郑州大学电气与信息工程学院,河南郑州450001 [3]华中科技大学电气与电子工程学院,湖北武汉430074

出　　处：《电力自动化设备》2023年第10期145-151,207,共8页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(52007010);强电磁工程与新技术国家重点实验室开放课题(AEET2022KF003)。

摘　　要：交直流混合微电网(HMG)联网与优化运行中,常规工频变压器不具备短路故障阻隔和电压综合控制能力。对此,提出一种适用于HMG的混合型联网变压器(HIT),并构建新型基于混合型联网变压器的交直流混合微电网(HIT-HMG)。介绍了HIT拓扑结构并分析其运行原理,构造新型三柱三绕组工频变压器进行电压等级变换和部分功率传输,由串联变流器实现HMG的电压和电流主动控制。对HIT及串联变流器进行数学建模,建立新型工频变压器的等效磁路模型和等效电路模型。考虑配电网不同位置与故障类型,提出HITHMG故障阻隔控制策略。对所提HIT及控制方案进行仿真和实验验证,结果表明通过控制HIT的串联绕组电压,可以阻隔中高压配电网故障对HMG的影响。In the interconnection and optimization operation of AC/DC hybrid microgrid(HMG),the conven⁃tional power-frequency transformer does not have the ability to block short-circuit faults and comprehensively voltage control.To solve this problem,a hybrid interlinking transformer(HIT)suitable for HMG is proposed,and the novel HMG based on HIT(HIT-HMG)is constructed.The typology structure and the operating principle of HIT are introduced.The novel three-limb three-winding power-frequency transformer is constructed to transform voltage level and transmit power,and achieves HMG voltage and current active control via the series converter.The mathematical models of the HIT and the series converter are built.The equivalent magnetic circuit and equivalent electrical circuit models are established.With considering of different fault locations and fault types of distribution network,a fault blocking coordination control strategy for the proposed HIT-HMG is proposed.The simulation and experiment are carried out to verify the proposed HIT and control strategy.The results show that,the impact of medium and high voltage distribution network faults on the HMG can be isolated by controlling the series winding voltage of HIT.

关 键 词：交直流混合微电网 工频变压器 变流器 故障阻隔 协调控制 

分 类 号：TM41[电气工程—电器] TM46