Impedance-based Stability Criterion for the Stable Evaluation of Grid-connected Inverter Systems with Distributed Parameter Lines  

作　　者：Xianghua Peng Honggeng Yang 

机构地区：[1]College of Electrical Engineering,Sichuan University,Chengdu,610065,Sichuan,China

出　　处：《CSEE Journal of Power and Energy Systems》2023年第1期145-157,共13页中国电机工程学会电力与能源系统学报（英文）

摘　　要：For a multi-inverter grid-connected system,the stability of the point of common coupling(PCC)voltage is evaluated considering the distribution parameters of the transmission lines.First,the systems on both sides of the PCC are equalized,a smallsignal equivalent circuit similar to the“current source-grid”is established,and a mathematical model for the voltage of the PCC is derived.Then,using Euler’s formula and Nyquist stability criterion,the PCC voltage stability of the grid-connected system is evaluated by the impedance analysis method under the premise that the single-side excitation is stable.In addition,the gridconnected conditions causing PCC voltage instability are studied.A phase compensation method based on an impedance phase compensation control strategy is introduced.The stability of the grid-connected system is improved by compensating the phase margin at the equivalent impedance crossover-section frequency on both sides of the grid-connected system PCC.Finally,a simulation circuit is built to simulate and analyze the proposed model and phase compensation method.The simulation results verify the accuracy and effectiveness of the theoretical analysis.

关 键 词：Distributed parameter line impedance-based approach impedance phase compensation multi-inverter grid connection PCC voltage model small-signal equivalent circuit 

分 类 号：TN9[电子电信—信息与通信工程]