弱电网下并网逆变器自适应H∞控制方法

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弱电网下并网逆变器自适应H∞控制方法

更新时间：2025-08-13

- 弱电网下并网逆变器自适应H∞控制方法
- Automation of Electric Power Systems Vol. 42, Issue 13, Pages: 189-195(2018)
- 作者机构：
  
  国网重庆市电力公司电力科学研究院,重庆市,401120
- 作者简介：
- 基金信息：
- DOI：
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- Published：2018
- 稿件说明：
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MA Xing. [J]. Automation of electric power systems, 2018, 42(13): 189-195.
DOI：

MA Xing. [J]. Automation of electric power systems, 2018, 42(13): 189-195. DOI：

摘要

在实际应用中，采用传统的鲁棒H∞控制方法的并网逆变器，其稳定性和干扰抑制性能往往会受到电网弱电网特性的影响。为了增强并网逆变器对电网阻抗变化的适应能力，提出一种适用于弱电网的并网逆变器改进H∞控制方法，即自适应H∞控制方法。以单相并网逆变器为例，建立了弱电网下并网逆变器的鲁棒H∞控制模型，证明了弱电网特性将会造成该模型中系统参数、控制输入参数以及干扰输入参数出现参数摄动，从而影响了系统的稳定性以及干扰抑制性能。为了克服弱电网特性的影响，改进方法中引入了间接控制来取代公共连接点电压前馈动态地调节公共连接点电压，消除了控制系统的参数摄动，增强了并网逆变器对弱电网具有自适应性，提高了系统的稳定性和干扰抑制性能。最后，通过搭建的实验平台验证了理论分析和所提自适应H∞控制方法的合理性及有效性。

Abstract

In practical applications

the stability and interference suppression performance of the grid-connected inverter

using the traditional robust H∞ control method

are often affected by the weak grid characteristics of the power grid. In order to enhance the adaptability of grid-connected inverters to grid impedance changes

this paper presents an improved H∞ control method for grid-connected inverters which is suitable for weak grids. A single-phase grid-connected inverter is used as an example to establish a robust H∞ control model for a grid-connected inverter under a weak grid and to prove that the weak grid characteristics will cause the system parameter

control input parameter and interference input parameter are perturbed

which affects the stability and interference suppression performance of the system. In order to overcome the influence of weak grid characteristics and improve the stability and interference suppression performance of the system

an improved H∞ control method for grid-connected inverter in weak power grid is proposed. In this method

indirect control is introduced to dynamically adjust the voltage of the common connection point and to eliminate the parameter perturbation of the control system

which makes the grid-connected inverter adaptable to the weak grid. Finally

the rationality and validity of the theoretical analysis and the improved H∞ control method are verified by the experiments.

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