电工技术学报  2017, Vol. 32 Issue (增刊1): 178-185    DOI: 10.19595/j.cnki.1000-6753.tces.L70043
电力电子与电力传动 |
提高LCL型并网逆变器阻抗重塑控制鲁棒性的延时补偿方法
谢文浩1, 刘一琦2, 王建赜1, 纪延超1, 于继来1
1. 哈尔滨工业大学电气工程及自动化学院 哈尔滨 150001;
2. 东北林业大学机电工程学院 哈尔滨 150040
A Delay Compensation Method of the Grid-Connected Inverter with LCL Filter to Improve Robustness of the Impedance Shaping Control
Xie Wenhao1, Liu Yiqi2, Wang Jianze1, Ji Yanchao1, Yu Jilai1
1. School of Electrical Engineering and Automation Harbin Institute of Technology Harbin 150001 China;
2. College of Mechanical and Electrical Engineering Northeast Forestry University Harbin 150040 China
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摘要 阻抗重塑方法通过增大LCL型并网逆变器的输出阻抗,提高逆变器对电网谐波电压的抗扰能力。但阻抗重塑控制通常采用数字控制方法,存在控制延时,降低了逆变器的稳定性,并在高于1/6采样频率(fs/6)的频率段减小了逆变器输出阻抗的模值。为此,提出一种LCL型并网逆变器的状态预估延时补偿方法,通过补偿延时环节产生的相位滞后,优化了虚拟阻抗函数。该方法显著增大了逆变器输出阻抗的模值,提高了阻抗重塑控制的鲁棒性,使逆变器在电网含有谐波电压时满足并网电流的谐波标准。以三相LCL型并网逆变器为例进行实验,验证了控制策略的有效性。
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关键词 并网逆变器阻抗重塑延时补偿    
Abstract:The impedance shaping control is capable to increase output impendence of the grid-connected inverter with LCL Filter, enhancing the harmonic-rejection-ability against the grid-voltage distortions. However, digital control method is applied with a control delay, which decreases the stability of the inverter as well as the output impedance at the frequencies above 1/6 of the sampling frequency (fs/6). In this paper, a discrete state predicting method for LCL filter is proposed to modify the virtual impedance by compensating the phase lag in control loop. The proposed strategy can effectively increase the output impedance to improve robustness of the impedance shaping control, and exhibit strong rejection ability of grid-voltage harmonics. Experimental results with a LCL-type three-phase grid-connected inverter verify the validity of the proposed strategy.
Key wordsGrid-connected inverter    impedance shaping    time delay    compensation   
收稿日期: 2016-07-22      出版日期: 2017-09-14
PACS: TM464  
通讯作者: 纪延超 男,1962年生,教授,博士生导师,研究方向为灵活交流输电系统、静态无功补偿器以及有源滤波器等。E-mail: gdjyc163@163.com   
作者简介: 谢文浩 男,1993年生,博士研究生,研究方向为新能源并网发电技术、分布式微电网运行控制。E-mail: wbzxwh@163.com
引用本文:   
谢文浩, 刘一琦, 王建赜, 纪延超, 于继来. 提高LCL型并网逆变器阻抗重塑控制鲁棒性的延时补偿方法[J]. 电工技术学报, 2017, 32(增刊1): 178-185. Xie Wenhao, Liu Yiqi, Wang Jianze, Ji Yanchao, Yu Jilai. A Delay Compensation Method of the Grid-Connected Inverter with LCL Filter to Improve Robustness of the Impedance Shaping Control. Transactions of China Electrotechnical Society, 2017, 32(增刊1): 178-185.
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