提出一种用于漏电流抑制的改进型H7逆变器拓扑来抑制无变压器光伏发电系统中的漏电流。该拓扑在H7型逆变器拓扑的基础上增加了一个钳位电路,该电路由3个容值相等的分压电容和3个钳位开关管构成,钳位电路可实现逆变器的共模电压在续流状态内保持稳定。同时提出一种共模电压高频控制方案,在保证钳位点的电压为UPV/3或2UPV/3的基础上增加了共模电压的频率,对应的增加了电路的共模回路阻抗,系统的共模特性得到了优化,漏电流的抑制效果更好。搭建一台每相输出200 W的原理样机,通过saber仿真和硬件实验验证了理论分析的正确性。
Abstract
In this paper, an improved H7 inverter topology for leakage current suppression is proposed to suppress the leakage current in the transformerless photovoltaic power generation system. Based on the topology of H7 inverter, a clamping circuit is added. The circuit is composed of three voltage divider capacitors with equal capacitance and three clamping switches. The clamping circuit can keep the common mode voltage of the inverter stable in the freewheeling state. At the same time, a high-frequency control scheme of common mode voltage is proposed, which increases the frequency of common mode voltage and the common mode loop impedance on the basis of the ensuring that the voltage of clamp point is UPV/3 or 2UPV/3. The common mode characteristics of the system is optimized and the leakage current suppression effect is better. A prototype with 200 W output per phase is built, and the correctness of the theoretical analysis is verified by saber simulation and hardware experiment.
关键词
光伏发电 /
三相逆变器 /
漏电流 /
共模电压 /
开关状态
Key words
PV power /
three phase inverter /
leakage current /
common mode voltage /
switch status
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 张志. 光伏发电发展趋势分析[J]. 现代物业, 2018, 412(1): 14.
ZHANG Z.Analysis on the development trend of photovoltaic power generation[J]. Modern property, 2018, 412(1): 14.
[2] 王玉楠, 张广太. 光伏发电并网及其相关技术发展现状与展望[J]. 风力发电, 2020(2): 5-6.
WANG Y N, ZHANG G T.Photovoltaic power generation and its related technologies development status and prospect[J]. Wind power generation, 2020(2): 5-6.
[3] 许建峰, 曹庆仁. 中国分布式光伏并网发电现状及应用研究[J]. 能源与节能, 2020(6): 51-54.
XU J F, CAO Q R.Research on the status and application of distributed photovoltaic grid-connected power generation in China[J]. Energy and energy conservation, 2020(6): 51-54.
[4] 张纯江, 贲冰, 李建, 等. 三相非隔离型Heric光伏逆变器漏电流抑制研究[J]. 电工技术学报, 2016, 31(17): 113-120.
ZHANG C J, FEN B, LI J, et al.Leakage current suppression for three-phase transformerless Heric photovoltaic inverter[J]. Transactions of China Electrotechnical Society, 2016, 31(17): 113-120.
[5] NABAE A, TAKAHASHI I, AKAGI H. A new neutral-point-clamped PWM inverter[J]. IEEE transactions on industry applications, 2008, IA-17(5): 518-523.
[6] 郭小强, 朱铁影. 新型非隔离型三相三电平光伏并网逆变器及其漏电流抑制研究[J]. 电工技术学报, 2018, 33(1): 26-37.
GUO X Q, ZHU T Y.Research on leakage current suppression of novel three-phase three-level non-isolated PV inverter[J]. Transactions of China Electrotechnical Society, 2018, 33(1): 26-37.
[7] CALAIS M, AGELIDIS V G, MEINHARDT M.Multilevel converters for single-phase grid connected photovoltaic systems: an overview[J]. Solar energy, 1999, 65(5): 325-335.
[8] 袁颖, 马海啸. 一种新型HERIC光伏逆变器漏电流抑制技术研究[J]. 微型机与应用, 2017(1): 35-37.
YUAN Y, MA H X.A new HERIC PV inverter for restraining the leakage current[J]. Microcomputers and applications, 2017(1): 35-37.
[9] 马海啸, 张晓峰. 一种用于漏电流抑制的续流箝位型三相逆变器[J]. 电机与控制学报, 2020, 193(11): 106-113.
MA H X, ZHANG X F.Freewheeling clamp three-phase inverter for leakage current suppression[J]. Electric machines and control, 2020, 193(11): 106-113.
[10] 肖华锋, 王晓标, 张兴, 等. 非隔离光伏并网逆变技术的现状与展望[J]. 中国电机工程学报, 2020, 40(4): 1038-1054.
XIAO H F, WANG X B, ZHANG X, et al.State-of-the-art and future trend of transformerless photovoltaic grid-connected inverters[J]. Proceedings of the CSEE, 2020, 40(4): 1038-1054.
[11] GUPTA A K, AGRAWAL H, AGARWAL V.A novel 3-phase transformerless H-8 topology with reduced leakage current for grid-tied solar PV applications[J]. IEEE transactions on industry applications, 2019, 55(2): 1765-1774.
[12] 马海啸, 陈泽峰. 一种十开关低漏电流三相逆变器的研究[J]. 电工电能新技术, 2020, 39(6): 26-33.
MA H X, CHEN Z F.Research on ten-switch three-phase inverter with low leakage current[J]. Advanced technology of electrical engineering and energy, 2020, 39(6): 26-33.
[13] 曹晨晨, 廖志凌. 共地型无漏电流单相非隔离光伏并网逆变器[J]. 中国电机工程学报, 2020, 40(4): 1063-1072.
CAO C C, LIAO Z L.Common-ground-type single-phase transformerless PV grid-connected inverters with no leakage currents[J]. Proceedings of the CSEE, 2020, 40(4): 1063-1072.
[14] BIDRAM A, DAVOUDI A, BALOG R S.Control and circuit techniques to mitigate partial shading effects in photovoltaic arrays[J]. IEEE journal of photovoltaics, 2012, 2(4): 532-546.
[15] CARRASCO J M, FRANQUELO L G, BIALASIEWICZ J T, et al.Power electronic systems for the grid integration of renewable energy sources: a survey[J]. IEEE transactions on industrial electronics, 2006, 53(4): 1002-1016.
[16] SHEN J M, JOU H L, WU J C.Novel transformerless grid-connected power converter with negative grounding for photovoltaic generation system[J]. IEEE transactions on power electronics, 2012, 27(4): 1818-1829.
[17] FREDDY T K S, RAHIM N A, HEW W, et al. Modulation techniques to reduce leakage current in three-phase transformerless H7 photovoltaic inverter[J]. IEEE transactions on industrial electronics, 2015, 62(1): 322-331.
[18] GUO X Q, WANG N, WANG B C, et al.Evaluation of three-phase transformerless DC-Bypass PV inverters for leakage current reduction[J]. IEEE transactions on power electronics, 2020, 35(6): 5918-5927.
[19] TAMAS K, REMUS T, MARCO L, et al.Evaluation of three-phase transformerless photovoltaic inverter topologies[J]. IEEE transactions on power electronics, 2009, 24(9): 2202-2211.
[20] MARCELO C C, KLEBER C O, ALEXANDRE M F, et al.Modulation techniques to eliminate leakage currents in transformerless three-phase photovoltaic systems[J]. IEEE transactions on power electronics, 2010, 57(4): 1360-1368.
基金
国家自然科学基金面上项目（51777098）
PDF(2643 KB)
