大型屋顶光伏电站并网直流抑制方法  

DC Injection Elimination for Large Roof Photovoltaic Power Station

作　　者：李圣清[1] 杨峻 徐天俊 张彬[1] 

机构地区：[1]湖南工业大学电气与信息工程学院,湖南株洲412007 [2]国网湘西供电公司,湖南吉首416000

出　　处：《电气传动》2015年第11期12-15,35,共5页Electric Drive

基　　金：国家自然科学基金项目(51077046);湖南省自然科学基金项目(2015JJ5009);湖南省高校重点实验室(2014249)

摘　　要：大型非隔离型光伏电站纷纷涌现,但对其直流注入的相关问题还鲜有涉及。提出一种大型非隔离型光伏电站并网直流分量抑制方法。首先分析系统并网直流分量与系统内SVG直流侧电容基频纹波电压的线性关系,继而对SVG直流侧基频电压经过dq变换和LPF滤波处理,最后对其构建闭环负反馈,在消除此纹波电压的同时间接消除并网直流分量IDC。仿真及实验证实了该方案的合理性及可行性。A lot large-scale non-isolated roof PV power stations have emerged, but the DC injection problem is rarely involved. A method was proposed to suppress this DC component. First analysis the linear relationship between DC component and capacitor fundamental frequency ripple voltage on SVG DC side , then the capacitor fundamental frequency ripple voltage through dq transform and LPF filtering, finally the construct closed loop negative feedback, the DC component can be eliminated. The simulation and experiment prove the rationality and feasibility of the scheme.

关 键 词：光伏电站 非隔离 三相逆变器 直流分量 静止同步补偿器 

分 类 号：TM464[电气工程—电器]