具有低次谐波抑制功能的虚拟电阻型光伏逆变器

LING Yuchang

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具有低次谐波抑制功能的虚拟电阻型光伏逆变器

更新时间：2025-08-13

- 具有低次谐波抑制功能的虚拟电阻型光伏逆变器
- Automation of Electric Power Systems Vol. 42, Issue 9, Pages: 114-119(2018)
- 作者机构：
  
  华南理工大学电力学院,广东省,广州市,510640
- 作者简介：
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- DOI：
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- Published：2018
- 稿件说明：
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LING Yuchang. [J]. Automation of electric power systems, 2018, 42(9): 114-119.
DOI：

LING Yuchang. [J]. Automation of electric power systems, 2018, 42(9): 114-119. DOI：

摘要

针对现有的具有谐波补偿功能的光伏逆变器只能就近补偿本地非线性负载的谐波而无法参与电网谐波治理及谐波治理贡献难以衡量的问题，研究了一种具有低次谐波抑制功能的虚拟电阻型光伏逆变器。分析了电阻对并网点谐波电压和电力系统谐振的抑制作用，基于此提出了虚拟电阻型光伏逆变器控制方法，用比例—积分控制器控制对并网点电压和电流进行快速傅里叶变换后所得各次谐波电流与相应的谐波电压同相，幅值相差Kh倍，光伏逆变器被等效为一个“虚拟电阻”。以吸收的谐波功率来衡量用户的谐波治理贡献，并提出了按吸收谐波功率最大化的准则自动调节Kh的控制策略。仿真和硬件实验结果表明，所提虚拟电阻型光伏逆变器在正常发电的同时能有效抑制公共连接点低次谐波电压。

Abstract

Aimed at the problem that the photovoltaic inverter with harmonic compensation can only compensate the harmonics from local non-linear load and cannot participate in the harmonic control of the power grid and it is difficult to measure the contribution of the harmonic control

this paper proposes a new virtual-resistance-type photovoltaic inverter

which can suppress the low-order harmonic voltages at point of common coupling(PCC). The suppressing impact of resistance on PCC harmonic voltages and power system resonance is analyzed. Based on it

the control method of virtual-resistance-type photovoltaic inverter is proposed. PI controllers are used to obtain the harmonic voltages and corresponding harmonic currents got by fast Fourier transformation on PCC voltages and grid-connected currents are in the same phase and differed by Kh in amplitudes

which makes photovoltaic inverter equal to a “virtual resistance”. Absorbed harmonic power is selected to measure the contributions to harmonic control

and Kh is adjusted automatically in the criteria of absorbed harmonic power maximization. The simulation and experiment results show that the proposed virtual-resistance-type inverter can be used for power generation

suppressing low-order harmonic voltages at PCC.

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