该文将Sepic电路和传统电流源逆变器结合,提出一种新型可升降压的三相电流源逆变器,并通过构建直流旁路,实现对共模电流的抑制。所提出的新型逆变器拓扑具有能实现升降压、调制方式简单且易于实现等优点,可适用于直流电压范围变化较大的光伏发电等场合。该文首先介绍了三相Sepic电流源逆变器电路拓扑的构造方法和工作原理;其次,推导了逆变器在任意开关时刻的共模电压表达式,并对其共模电流抑制效果进行分析;然后,建立逆变器的等效电路图和数学模型,详细分析逆变器的升降压能力;最后,通过仿真和实验证明所提出的三相Sepic电流源逆变器及其控制方案的有效性和可行性。
Abstract
In this paper, a novel three-phase current source inverter with single-stage Buck-Boost function is proposed by combining Sepic circuit with traditional current source inverter, and the common mode current of the inverter is suppressed by constructing the DC-bypass. The proposed inverter topology has the advantages of the ability to realize boosting and bucking, simple and easy to implement modulation, which can be applied to the occasions where the DC voltage range changes greatly like photovoltaic power generation. This paper firstly introduces the circuit topology and working principle of the three-phase Sepic-type current source inverter. Secondly, the expression of the common mode voltage of the inverter at any switching time is deduced, and its common mode current suppression effect is analyzed. Thirdly, the equivalent circuit diagram and mathematical model of the inverter are established, and the Bbuck-Boost capability of the inverter is analyzed in detail. Finally, the effectiveness and feasibility of the proposed three-phase Sepic-type current source inverter and its control scheme are proved by simulations and experiments.
关键词
光伏发电 /
逆变器 /
漏电流 /
三相电流源逆变器 /
Sepic变换器
Key words
photovoltaic power generation /
inverters /
leakage currents /
three-phase current source inverter /
Sepic converter
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参考文献
[1] 王立乔, 孙孝峰. 分布式发电系统中的光伏发电技术,第2版[M]. 北京: 机械工业出版社, 2014: 1-7.
WANG L Q, SUN X F.Photovoltaic power generation technology in distributed generation systems, second edition[M]. Beijing: China Machine Press, 2014: 1-7.
[2] 陈国平, 梁志峰, 董昱. 基于能源转型的中国特色电力市场建设的分析与思考[J]. 中国电机工程学报, 2020, 40(2): 369-379.
CHEN G P, LIANG Z F, DONG Y.Analysis and reflection on the marketization construction of electric power with Chinese characteristics based on energy transformation[J]. Proceedings of the CSEE, 2020, 40(2): 369-379.
[3] 王立乔, 李占一, 杨彬. 一种新型无电解电容的单级Zeta逆变器[J]. 中国电机工程学报, 2019, 39(14): 4221-4231.
WANG L Q, LI Z Y, YANG B.A novel single-stage Zeta inverter with non-electrolytic capacitor[J]. Proceedings of the CSEE, 2019, 39(14): 4221-4231.
[4] 肖华锋, 谢少军, 陈文明, 等. 非隔离型光伏并网逆变器漏电流分析模型研究[J]. 中国电机工程学报, 2010, 30(18): 9-14.
XIAO H F, XIE S J, CHEN W M, et al.Study on leakage current model for tansformerless photovoltaic grid-connected inverter[J]. Proceedings of the CSEE, 2010, 30(18): 9-14.
[5] HERNANDEZ J C, VIDAL P G, MEDINA A.Characterization of the insulation and leakage currents of PV generators: relevance for human safety[J]. Renewable energy, 2010, 35(3): 593-601.
[6] ALI KHAN A, LU Y W, EBERLE W, et al.Single-stage bidirectional Buck-Boost inverters using a single inductor and eliminating the common-mode leakage current[J]. IEEE transactions on power electronics, 2020, 35(2): 1269-1281.
[7] 岳秀梅, 郭明乾, 朱晓楠, 等. 一种小输入侧电感具有漏电流抑制能力的单相单级电流源型逆变器[J]. 中国电机工程学报, 2022, 42(12): 4516-4526.
YUE X M, GUO M Q, ZHU X N, et al.A single-phase single-stage current source inverter with small input side inductor and leakage current suppression capability[J]. Proceedings of the CSEE, 2022, 42(12): 4516-4526.
[8] ROJAS C A, AGUIRRE M, KOURO S, et al.Leakage current mitigation in photovoltaic string inverter using predictive control with fixed average switching frequency[J]. IEEE transactions on industrial electronics, 2017, 64(12): 9344-9354.
[9] CAVALCANTI M C, DE OLIVEIRA K C, DE FARIAS A M, et al. Modulation techniques to eliminate leakage currents in transformerless three-phase photovoltaic systems[J]. IEEE transactions on industrial electronics, 2010, 57(4): 1360-1368.
[10] GUO X Q, WEI B Z, ZHU T Y, et al.Leakage current suppression of three-phase flying capacitor PV inverter with new carrier modulation and logic function[J]. IEEE transactions on power electronics, 2018, 33(3): 2127-2135.
[11] HEO G, PARK Y, LEE J, et al.Vector-splitting method to reduce common-mode voltages in two-level inverters for grid connection[J]. IEEE transactions on industrial electronics, 2021, 68(11): 11044-11052.
[12] MIRAFZAL B, SAGHALEINI M, KAVIANI A K.An SVPWM-based switching pattern for stand-alone and grid-connected three-phase single-stage boost inverters[J]. IEEE transactions on power electronics, 2011, 26(4): 1102-1111.
[13] GUO X Q.Three-phase CH7 inverter with a new space vector modulation to reduce leakage current for transformerless photovoltaic systems[J]. IEEE journal of emerging and selected topics in power electronics, 2017, 5(2): 708-712.
[14] 郭小强, 贾晓瑜. 无变压器三相直流旁路光伏逆变器共模特性研究[J]. 中国电机工程学报, 2017, 37(11): 3270-3277, 3383.
GUO X Q, JIA X Y.Common mode behavior analysis of transformerless three-phase DC-bypass PV inverters[J]. Proceedings of the CSEE, 2017, 37(11): 3270-3277, 3383.
[15] 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.
[16] ANAND S, GUNDLAPALLI S K, FERNANDES B G.Transformer-less grid feeding current source inverter for solar photovoltaic system[J]. IEEE transactions on industrial electronics, 2014, 61(10): 5334-5344.
[17] GUO X Q, HE R, JIAN J M, et al.Leakage current elimination of four-leg inverter for transformerless three-phase PV systems[J]. IEEE transactions on power electronics, 2016, 31(3): 1841-1846.
[18] SUN Y, LIU Y L, SU M, et al.Topology and control of a split-capacitor four-wire current source inverter with leakage current suppression capability[J]. IEEE transactions on power electronics, 2018, 33(12): 10803-10814.
[19] 董子亮. 三相电流型Buck-Boost逆变器漏电流抑制技术研究[D]. 秦皇岛: 燕山大学, 2017.
DONG Z L.The leakage current suppression of three-phase current source Buck-Boost inverter[D]. Qinhuangdao: Yanshan University, 2017.
[20] SARNAGO H, LUCIA O, MEDIANO A, et al.Modulation scheme for improved operation of an RB-IGBT-based resonant inverter applied to domestic induction heating[J]. IEEE transactions on industrial electronics, 2013, 60(5): 2066-2073.
[21] 张兴. PWM整流器及其控制[M]. 北京: 机械工业出版社, 2014: 347-361.
ZHANG X.PWM rectifier and its control[M]. Beijing: China Machine Press, 2014: 347-361.
[22] 姜艳姝, 刘宇, 徐殿国, 等. PWM变频器输出共模电压及其抑制技术的研究[J]. 中国电机工程学报, 2005(9): 47-53.
JIANG Y S, LIU Y, XU D G, et al.Research on common-mode voltage generated by a PWM inverter and its cancellation technology[J]. Proceedings of the CSEE, 2005(9): 47-53.
[23] 李嘉欣. 三相电流型Sepic逆变器研究[D]. 秦皇岛: 燕山大学, 2019.
LI J X.Research on the three-phase current source Sepic inverter[D]. Qinhuangdao: Yanshan University, 2019.
基金
国家自然科学基金（51677162）; 河北省自然科学基金（E2017203235）; 河北省自然科学基金青年基金（E2019203297）
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