| 并网逆变器的阻抗自适应控制方法 |
| |
| 引用本文： | 杜燕,崔林波,杨向真,张显创,汪飞.并网逆变器的阻抗自适应控制方法[J].电力系统自动化,2018,42(6):120-127. |
| |
| 作者姓名： | 杜燕 崔林波 杨向真 张显创 汪飞 |
| |
| 作者单位： | 合肥工业大学电气与自动化工程学院, 安徽省合肥市 230009; 教育部光伏系统工程研究中心, 合肥工业大学, 安徽省合肥市 230009,合肥工业大学电气与自动化工程学院, 安徽省合肥市 230009; 教育部光伏系统工程研究中心, 合肥工业大学, 安徽省合肥市 230009,合肥工业大学电气与自动化工程学院, 安徽省合肥市 230009; 教育部光伏系统工程研究中心, 合肥工业大学, 安徽省合肥市 230009,合肥工业大学电气与自动化工程学院, 安徽省合肥市 230009; 教育部光伏系统工程研究中心, 合肥工业大学, 安徽省合肥市 230009,上海大学机电工程与自动化学院, 上海市 200072 |
| |
| 基金项目： | 国家自然科学基金资助项目(51407057) |
| |
| 摘 要： | 弱电网下,含电网电压前馈控制的并网逆变器和电网之间的阻抗交互作用,可能导致并网电流谐波放大甚至系统失稳。分析了输出阻抗特性,以提高逆变器与电网之间的稳定相角裕度为目标,提出了基于并网电流微分和电网电压微分的串、并联复合阻抗校正方法;讨论了微分系数对相角提升的灵敏度,给出了一种自适应调整的微分系数设计方法。该方法使得并网系统在电网阻抗宽范围变化时均能稳定运行,同时提高了并网系统对电网电压的抗扰性能。实验结果验证了所提控制方法的有效性。
|
| 关 键 词： | 电压前馈 并网逆变器 自适应控制 弱电网 |
| 收稿时间： | 2017/8/9 0:00:00 |
| 修稿时间： | 2018/1/25 0:00:00 |
Adaptive Control Method of Impedance for Grid-connected Inverters |
| |
| DU Yan,CUI Linbo,YANG Xiangzhen,ZHANG Xianchuang and WANG Fei.Adaptive Control Method of Impedance for Grid-connected Inverters[J].Automation of Electric Power Systems,2018,42(6):120-127. |
| |
| Authors: | DU Yan CUI Linbo YANG Xiangzhen ZHANG Xianchuang and WANG Fei |
| |
| Affiliation: | School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China; Research Center for Photovoltaic Systems Engineering of Ministry of Education, Hefei University of Technology, Hefei 230009, China,School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China; Research Center for Photovoltaic Systems Engineering of Ministry of Education, Hefei University of Technology, Hefei 230009, China,School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China; Research Center for Photovoltaic Systems Engineering of Ministry of Education, Hefei University of Technology, Hefei 230009, China,School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China; Research Center for Photovoltaic Systems Engineering of Ministry of Education, Hefei University of Technology, Hefei 230009, China and School of Mechatronics Engineering and Automation, Shanghai University, Shanghai 200072, China |
| |
| Abstract: | In the condition of a weak grid, the interaction between the grid-connected inverters and the grid might directly lead to the instability of inverters especially for those inverters with grid-voltage feedforward controllers. A serial-parallel impedance reshaping controller is proposed to improve the phase margin at the intersected frequency between the inverter and the grid after analyzing the output impedance characteristics. Moreover, a self-adjusting differential coefficient design method is presented as well after discussing the sensitivity of the differential coefficient to the phase enhancement. With this proposed controller, the system stability and the robustness against grid-voltage-harmonics are improved. The experimental results verify the effectiveness of the proposed control method. |
| |
| Keywords: | voltage feedforward grid-connected inverters adaptive control weak grid |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《电力系统自动化》浏览原始摘要信息 |
|
点击此处可从《电力系统自动化》下载全文 |
|
