Study on the Interaction Among Control Systems of Multiple Grid-connected Inverters Based on the SVD Method
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摘要: 针对弱电网下多逆变器并网时控制系统间出现的交互影响现象，本文提出基于奇异值分解法进行研究。建立弱电网下多逆变器并网等效模型，采用基于奇异值分解法(SVD)对逆变器控制系统间的交互作用进行定量分析，在确保并网系统稳定性的前提下，给出了随着并网逆变器台数、控制参数和电网等值阻抗改变时交互影响角θ的变化特性。最后，在Simulink仿真平台中搭建多逆变器并网模型验证分析结果正确性。同时，精确描述了随着并网台数的增加，多逆变器并网控制系统间交互影响对并网电流中某些频次谐波含有率改变的一般规律。Abstract: As to the interacting influences among control systems caused by multiple inverters connected to weak power grid, which is studied by using the SVD method. The equivalent model of weak-structured power system with multiple grid-connected inverters is established, SVD is used to quantitatively analyze the interaction influences among control systems of multiple inverters, and varying characteristics of interaction influence angle θ varying with the number of grid-connected inverters, control parameters and equivalent impedance of power grid is given with the premise of ensuring the stability of power system. In the end, the power gird model with multiple grid-connected inverters is built on Simulink simulation platform to verify the correctness of analysis results. At the same time, general rules that the interaction influences among control systems for multiple grid-connected inverters on the containing rate for certain harmonics are accurately descripted.
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Key words:
- SVD /
- grid-connected inverters /
- interaction /
- weak power grid
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