基于<em>H</em><sub>∞</sub>混合灵敏度的并网逆变器谐振控制策略

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摘要随着可再生能源及分布式发电相继并入电网,并网的电能质量问题备受关注。并网逆变器作为分布式发电和交流电网之间的连接枢纽,是解决电能质量问题的关键。为了减小逆变器输出电压电流的谐振,提出基于虚拟同步机算法的H_∞鲁棒控制策略。首先在系统性能要求的基础上,选取灵敏度加权函数来解决电网参数波动问题,建立并网逆变器系统数学模型及状态空间方程,最后通过求解代数黎卡提方程,得到H_∞控制器。在Matlab/Simulink仿真平台上,比较所提控制方法与传统PID控制方法、下垂控制方法,验证了所提控制方法应对电网参数变化、滤波器参数波动具有较强的鲁棒性。

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关键词 ：并网逆变器, 虚拟同步机, H_∞控制, 谐振抑制

Abstract：With the successive integration of renewable energy and distributed generation into the power grid, the power quality of grid-connected power has attracted much attention. As the connection hub between distributed generation and AC grid, the grid-connected inverter is the key to solving the problem of power quality. In order to reduce the resonance of inverter output voltage and current, a H_∞ robust control strategy based on virtual synchronous machine algorithm is proposed. Firstly, on the basis of system performance requirements, the sensitivity weighting function is selected to solve the problem of grid parameter fluctuation, and the mathematical model and state space equation of the grid-connected inverter system are established. Finally, the H_∞ controller is obtained by solving the algebraic Riccati equation. Compared with the traditional PI control method and the droop control method on the Matlab/Simulink simulation platform, it is verified that the method proposed in this paper has strong anti-interference and stability in response to changes in grid parameters and filter parameter fluctuations.

Key words： grid-connected inverter virtual synchronous machine H_∞ control resonance suppression

收稿日期: 2022-07-06

作者简介: 张萍（1979—）,女,博士,副教授,研究方向为新能源发电建模与分析、电力电子技术开发与应用。

引用本文:

张萍, 沈新鹤. 基于H_∞混合灵敏度的并网逆变器谐振控制策略[J]. 电气技术, 2022, 23(11): 6-12. ZHANG Ping, SHEN Xinhe. Resonance control strategy of grid connected inverter based on hybrid sensitivity. Electrical Engineering, 2022, 23(11): 6-12.

链接本文:

http://dqjs.cesmedia.cn/CN/Y2022/V23/I11/6

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