中国电机工程学报Issue(15)：2327-2335,9.DOI:10.13334/j.0258-8013.pcsee.2014.15.001
提高LCL型并网逆变器对弱电网适应能力的虚拟阻抗方法
A Virtual Impedance Method to Improve the Performance of LCL-type Grid-connected Inverters Under Weak Grid Conditions
摘要
Abstract
Under the high penetration of distributed power generation systems, the grid can not be treated as the ideal sinusoidal voltage source any more. Instead, it contains a large set of grid impedance values and varieties of harmonics, which features as the weak grid. When the inverter is operating under the weak grid condition, the stability problem can be aroused by the grid impedance, and the injected grid current is greatly distorted by the harmonics voltages. The output impedance of the inverter gave an insight into the robustness and the harmonic rejection ability of the control system, which is investigated in this paper. Based on which, the virtual impedance method was proposed to shape the characteristics of inverter output impedances. The implementation and parameter design of the virtual impedances were also analyzed. Thus, the robustness and harmonic rejection ability could be improved at the same time. Experimental results from a 6 kW LCL-type single-phase grid-connected inverter verify the effectiveness of the proposed method.关键词
弱电网/并网逆变器/输出阻抗/电能质量/鲁棒性/虚拟阻抗/数字控制延时Key words
weak grid/grid-connected inverter/output impedance/power quality/robustness/virtual impedance/digital control delay分类
信息技术与安全科学引用本文复制引用
杨东升,阮新波,吴恒..提高LCL型并网逆变器对弱电网适应能力的虚拟阻抗方法[J].中国电机工程学报,2014,(15):2327-2335,9.基金项目
江苏省333高层次人才培养工程专项资助(BRA2012141)；中央高校基本科研业务费专项资金(YAH12012)；南京航空航天大学博士学位论文创新与创优基金(BCXJ12-05)；江苏省研究生培养创新工程(CXLX12_0154)。Project Supported by Jiangsu Province 333 Program for Excellent Talents (BRA2012141) （BRA2012141）
The Fundamental Research Funds for the Central Universities (YAH12012) （YAH12012）
Funding for Outstanding Doctoral Dissertation in NUAA(BCXJ12-05) （BCXJ12-05）
Funding of Jiangsu Innovation Program for Graduate Education (CXLX12_0154) （CXLX12_0154）
