混合微电网交流侧故障传播机理及抑制方法  

Fault propagation mechanism and suppression method on AC side of hybrid microgrid

作　　者：朱永强[1] 刘康[1] 张泉 张少谦 ZHU Yong-qiang;LIU Kang;ZHANG Quan;ZHANG Shao-qian(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,北京102206

出　　处：《电机与控制学报》2020年第4期1-11,共11页Electric Machines and Control

基　　金：国家重点研发项目(2018YFB0904701)。

摘　　要：针对混合微电网网间的故障传播问题,首先分析了交流侧三相短路故障在网间互联变流器上的传播机理,通过求解此故障状态下混合微电网直流侧母线电压故障响应的二阶非齐次线性微分方程,得到对应的直流侧母线电压的故障响应表达式;其次分析交流侧不对称短路故障对直流侧功率、电压和分布式电源输出的影响,并在此基础上提出一种负序零序电压的补偿控制策略来抑制此类型故障的传播;最后在仿真软件上搭建了使用"网-网"型互联变流器控制策略的混合微电网模型,验证了前述故障分析的正确性和改进控制策略的有效性。Aiming at the problem of fault propagation between hybrid microgrid networks,firstly,the propagation mechanism of three-phase short-circuit fault in AC side on inter network converter was analyzed. By solving the second-order non-homogeneous linear differential equation of bus voltage fault response in DC side of hybrid microgrid in this fault state,the corresponding fault response expression of bus voltage in DC side was obtained;secondly,the non-linear differential equation in AC side was analyzed Based on influence of symmetrical short circuit fault on DC side power,voltage and distributed power output,a compensation control strategy of negative sequence zero sequence voltage was proposed to suppress the propagation of this type of fault. Finally,a hybrid microgrid model using"network network"interconnected converter control strategy was built on the simulation software,which verifies correctness of the above fault analysis and improves effectiveness of the control strategy.

关 键 词：交直流混合微电网 故障传播 不对称短路 负序零序补偿 互联变流器 下垂控制 

分 类 号：TM712[电气工程—电力系统及自动化]