弱电网下多逆变器并网谐振失稳分析方法  

Method of resonance instability analysis of multiple grid-connected inverters in weak grid

作　　者：张占俊 李建文[2] 董耀 王剑锋 杨怀建 Zhang Zhanjun;Li Jianwen;Dong Yao;Wang Jianfeng;Yang Huaijian(State Grid Haixi Power Supply Company,Golmud,Qinghai 817000;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Baoding,Hebei 071003)

机构地区：[1]国网海西供电公司,青海格尔木817000 [2]华北电力大学新能源电力系统国家重点实验室,河北保定071003

出　　处：《电气技术》2020年第10期21-28,共8页Electrical Engineering

基　　金：国网青海省科技攻关项目(522806170003)。

摘　　要：针对弱电网下多逆变器并网产生的谐振失稳问题,本文采用基于并网系统节点导纳矩阵的模态分析法进行研究。首先,建立多逆变器并网系统的等效阻抗模型;然后,分别阐述阻抗分析法、频域分析法和模态分析法在多逆变器并网谐振失稳研究中的应用原理,对比分析了3种谐振失稳分析方法的应用特点,并将模态分析法拓展应用于不同控制类型多逆变器并网的工况,结果表明,3种方法获取的谐振失稳频率一致,其中模态分析法过程最简便、可获取的谐振信息最全面;最后,通过Matlab仿真验证了上述3种方法的有效性和正确性。Aiming at the resonance instability problem of multiple grid-connected inverters in weak grid,in this paper,the modal analysis method based on the node admittance matrix of the grid-connected system is applied to study the multi-inverter grid-connected resonance instability.First,the equivalent impedance model of a multi-inverter grid-connected system is established.Then,the application principles of impedance analysis method,frequency domain analysis method and modal analysis method in the study of multi-inverter grid-connected resonance instability are expatiated respectively,and the application characteristics of the three methods are compared.And the modal analysis method is applied under multiple inverters with different control types.The results show that the resonance instability frequencies of grid-connected system obtained by the above three methods are the same,and the modal analysis method is the most convenient method,which could get more available and comprehensive resonance information.Finally,the validity and correctness of three analysis methods are verified by Matlab simulation.

关 键 词：多逆变器 谐振 模态分析 频域分析 阻抗分析 

分 类 号：TM464[电气工程—电器]