上海交通大学学报

上海交通大学学报 >

2023 , Vol. 57 >Issue 9: 1105 - 1113

DOI: https://doi.org/10.16183/j.cnki.jsjtu.2022.120

新型电力系统与综合能源

基于改进无源性控制的三相LCL并网逆变器输出导纳重塑方法

  • 王晗 ,
  • 张建文 ,
  • 施刚 ,
  • 朱淼 ,
  • 蔡旭
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  • 上海交通大学 电力传输与功率变换控制教育部重点实验室,上海 200240
王晗(1982-),博士,助理研究员,从事新能源电力变换控制技术研究.

收稿日期: 2022-04-24

  修回日期: 2022-09-23

  录用日期: 2022-12-13

  网络出版日期: 2023-03-24

基金资助

国家电网有限公司总部科技项目(4000-202055048A-0-0-00)

收起

An Admittance Reshaping Strategy of Three-Phase LCL Grid-Connected Inverter Based on Modified Passive Control

  • Han WANG ,
  • Jianwen ZHANG ,
  • Gang SHI ,
  • Miao ZHU ,
  • Xu CAI
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  • Key Laboratory of Control of Power Transmission and Conversion of the Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China

Received date: 2022-04-24

  Revised date: 2022-09-23

  Accepted date: 2022-12-13

  Online published: 2023-03-24

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摘要

基于能量函数的无源性控制(PBC)被广泛研究并用于并网变换器以获得更好的控制性能.然而,传统的PBC方法依赖并网变换器的精确数学模型,且已有研究较少考虑数字控制的延迟效应以及电容性电网或复杂弱电网下电网阻抗的不确定性对系统稳定控制的影响.鉴于此,针对三相LCL并网逆变器提出一种改进PBC方法以实现导纳重塑,通过增加电容电流前馈将系统无源区域扩展到奈奎斯特频率,在电网阻抗宽范围变化下实现LCL谐振频率的有源阻尼控制,并提出改进PBC控制参数设计方法.在3 kW并网逆变器样机平台上开展仿真和实验研究,验证了理论分析的正确性.

关键词： LCL滤波器; 并网逆变器; 无源控制; 有源阻尼; 稳定性

本文引用格式

王晗 , 张建文 , 施刚 , 朱淼 , 蔡旭 . 基于改进无源性控制的三相LCL并网逆变器输出导纳重塑方法[J]. 上海交通大学学报, 2023 , 57(9) : 1105 -1113 . DOI: 10.16183/j.cnki.jsjtu.2022.120

Abstract

The passivity-based control (PBC) based on energy function has been studied for grid-connected converters to achieve a better performance. However, traditional PBC method relies on the accurate mathematical model of grid-connected inverter. In previous studies on PBC, the effect of digital control delay is rarely considered and the stability under grid impedance uncertainties is not discussed, especially in the capacitive grid or complex weak grid. To address these issues, this paper proposes an improved PBC method to reshape the output admittance for LCL-filtered grid-connected inverters. The system passive region is expanded up to the Nyquist frequency by adding a capacitor current feedback loop which can achieve active damping control of LCL resonant frequency under the wide range of grid impedance changes. The parameter design method is also presented for the proposed PBC control. To verify the correctness of the theoretical analysis, both simulation and experiments are conducted on a 3 kW grid-connected inverter prototype.

Key words： LCL filter; grid-connected inverter; passivity-based control (PBC); active damping; stability

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