电源学报

加权平均电流控制下基于观测器的准Z源逆变器直流偏置抑制策略

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林俊芳 ¹^,² , 何国锋中国电源学会会员 ¹^,² , 周子淳 ¹^,² , 王航 ¹^,²

电源学报 | DC-AC逆变器 2025,23(6): 152-161

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电源学报 |DC-AC逆变器 2025 , 23 (6) : 152 -161

加权平均电流控制下基于观测器的准Z源逆变器直流偏置抑制策略

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林俊芳¹^,², 何国锋中国电源学会会员¹^,², 周子淳¹^,², 王航¹^,²

作者信息

^1.三峡大学电气与新能源学院，宜昌　443002

^2.河南城建学院电气与控制工程学院，平顶山　467036

通讯作者:

何国锋（1971—　），男，中国电源学会会员，通信作者，博士，教授。研究方向：新能源发电技术、变流器高效控制技术、微电网运行与控制技术。E-mail：dragonhgf@hncj.edu.cn。

作者简介:

林俊芳（1996—　），男，硕士研究生。研究方向：逆变器与新能源技术。E-mail：linjf@ctgu.edu.cn。

周子淳（1999—　），男，硕士研究生。研究方向：新能源发电并网逆变器稳定控制。E-mail：202108080021064@ctgu.edu.cn。

王航（1998—　），男，硕士研究生。研究方向：逆变器与新能源技术。E-mail：15236506912@163.com。

DC Offset Suppression Strategy for Quasi-Z-source Inverter Based on Observer under Weighted Average Current Control

Junfang LIN¹^,², Guofeng HE Member, CPSS¹^,², Zichun ZHOU¹^,², Hang WANG¹^,²

Affiliations

^1.College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443002, China

^2.School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China

出版时间: 2025-10-30 doi: 10.13234/j.issn.2095-2805.2025.6.152

文章导航

摘要

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针对准Z源逆变器采用无隔离变压器并网时电流存在直流偏置问题，提出一种加权平均电流控制下基于观测器的直流偏置抑制策略。首先，分析准Z源逆变器的拓扑及其直流偏置产生的原因。其次，利用加权平均电流控制将三阶LCL滤波器降为一阶，简化系统模型，同时消除谐振问题。然后，采用扰动观测器对逆变器输出电压直流偏置量进行实时观测，通过反馈对直流偏置量扰动进行动态补偿，并对其稳定性进行分析。最后，通过实验对所提策略进行验证。实验结果表明，所提策略可以有效减小入网电流的直流偏置量，满足并网直流偏置小于0.5%的要求，同时使逆变器具有良好的稳态和动态性能。

关键词

准Z源逆变器 / 直流偏置抑制 / 加权平均电流 / 观测器

Abstract

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Aimed at the issue of DC offset injection to the grid when the topology of a quasi-Z-source grid-connected inverter without isolation transformer is adopted, a DC offset suppression strategy based on an observer under weighted average current control is proposed in this paper. First, the topology of the quasi-Z-source inverter and the causes of DC offset are analyzed. Second, the order of an LCL filter is reduced from the third-order to first-order by weighted average current control, thus simplifying the system model and eliminating the resonance problem. Then, a disturbance observer is utilized to observe the DC offset of inverter output voltage in realtime, the DC offset disturbance is dynamically compensated by feedback, and its stability is analyzed. Finally, the proposed strategy was validated by experiments. Experimental results show that the proposed strategy can effectively reduce the DC offset of grid-connected current, meet the grid-connected DC offset requirement of less than 0.5%, and ensure good steady-state and dynamic performances of the inverter.

Key words

Quasi-Z-source inverter / DC offset suppression / weighted average current / observer

引用本文

林俊芳, 何国锋中国电源学会会员, 周子淳, 王航. 加权平均电流控制下基于观测器的准Z源逆变器直流偏置抑制策略. 电源学报, 2025 , 23 (6) : 152 -161 . DOI: 10.13234/j.issn.2095-2805.2025.6.152

Junfang LIN, Guofeng HE, Zichun ZHOU, Hang WANG. DC Offset Suppression Strategy for Quasi-Z-source Inverter Based on Observer under Weighted Average Current Control[J]. Journal of Power Supply, 2025 , 23 (6) : 152 -161 . DOI: 10.13234/j.issn.2095-2805.2025.6.152

基金

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河南省自然科学基金面上项目(222300420400)

参考文献

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文献

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参考文献引证文献

排序方式：

[1]

樊刚强, 杨勇. 基于LCL参数优化的新能源微电网并网逆变器控制方法[J]. 电源学报, 2021, 19(3): 70-76. Fan Gangqiang, Yang Yong. Control method for grid-connected inverter in new energy microgrid based on LCL parameter optimization[J]. Journal of Power Supply, 2021, 19(3): 70-76. (in Chinese)

[2]

杨权, 梁永昌, 魏建荣, 等. 多谐波源下分布式电源并网逆变器的谐波抑制策略[J]. 电工技术学报, 2023, 38(11): 2908-2920. Yang Quan, Liang Yongchang, Wei Jianrong, et al. Research on harmonic suppression strategy of grid connected inverter under multi-harmonic sources[J]. Transactions of China Electrotechnical Society, 2023, 38(11): 2908-2920.

[3]

屈艾文, 许俊阳, 陈道炼. 三相电压型准Z源逆变器电路拓扑和调制策略[J]. 电源学报, 2018, 16(4): 133-142. Qu Aiwen, Xu Junyang, Chen Daolian. Circuit topologies and modulation strategies for three-phase voltage-fed quasi-Z-source inverter[J]. Journal of Power Supply, 2018, 16(4): 133-142. (in Chinese)

[4]

王林, 孙鹏菊, 薛统宇, 等. 一种提高LCL型并网逆变器电流控制性能的延时补偿方法[J]. 中国电机工程学报, 2020, 40(19): 6320-6330. Wang Lin, Sun Pengju, Xue Tongyu, et al. A delay compensation method to improve the current control performance of the LCL-type grid-connected inverter[J]. Proceedings of the CSEE, 2020, 40(19): 6320-6330. (in Chinese)

[5]

Zhang Weichi, Armstrong M, Ali Elgendy M. Mitigation of DC current injection in transformer-less grid-connected inverters using a voltage filtering DC extraction approach[J]. IEEE Transactions on Energy Conversion, 2019, 34(1): 426-434.

[6]

Xiao Huafeng. Overview of transformerless photovoltaic grid-connected inverters[J]. IEEE Transactions on Power Electronics, 2021, 36(1): 533-548.

[7]

Gonzalez R, Gubia E, Lopez J, et al. Transformerless single-phase multilevel-based photovoltaic inverter[J]. IEEE Transactions on Industrial Electronics, 2008, 55(7): 2694-2702.

[8]

Long Bo, Wang Wei, Huang Lijun, et al. Design and implementation of a virtual capacitor based DC current suppression method for grid-connected inverters[J]. ISA Transactions, 2019, 92: 257-272.

[9]

王宝诚, 郭小强, 梅强, 等. 无变压器非隔离型光伏并网逆变器直流注入控制技术[J]. 中国电机工程学报, 2009, 29(36): 23-28. Wang Baocheng, Guo Xiaoqiang, Mei Qiang, et al. DC injection control for transformerless PV grid-connected inverters[J]. Proceedings of the CSEE, 2009, 29(36): 23-28. (in Chinese)

[10]

He Guofeng, Xu Dehong, Chen Min. A novel control strategy of suppressing DC current injection to the grid for single-phase PV inverter[J]. IEEE Transactions on Power Electronics, 2015, 30(3): 1266-1274.

[11]

Chen Min, Xu Dehong, Zhang Tao, et al. A novel DC current injection suppression method for three-phase grid-connected inverter without the isolation transformer[J]. IEEE Transactions on Industrial Electronics, 2018, 65(11): 8656-8666.

[12]

Long Bo, Huang Lijun, Sun Hongbin, et al. An intelligent DC current minimization method for transformerless grid-connected photovoltaic inverters[J]. ISA Transactions, 2019, 88: 268-279.

[13]

阚志忠, 姜春鹏, 何浩, 等. 储能用宽范围输入改进型串联Z源逆变器[J]. 电工电能新技术, 2021, 40(4): 10-16. Kan Zhizhong, Jiang Chunpeng, He Hao, et al. Wide range input improved series Z source inverter for energy storage[J]. Advanced Technology of Electrical Engineering and Energy, 2021, 40(4): 10-16. (in Chinese)

[14]

Long Bo, Zhang Muheng, Liao Yong, et al. An overview of DC component generation, detection and suppression for grid-connected converter systems[J]. IEEE Access, 2019, 7: 110426-110438.

[15]

何国锋. 全桥并网逆变器直流扰动分析[J]. 可再生能源, 2016, 34(1): 9-14. He Guofeng. Analysis of DC disturbance for full-bridge inverter[J]. Renewable Energy Resources, 2016, 34(1): 9-14. (in Chinese)

[16]

游云峰, 李媛, 方番, 等. 级联多电平准Z源逆变器的无差拍并网控制策略[J]. 电力系统保护与控制, 2019, 47(17): 48-53. You Yunfeng, Li Yuan, Fang Fan, et al. Deadbeat grid-connected control strategy of quasi-Z-source cascaded multilevel inverter[J]. Power System Protection and Control, 2019, 47(17): 48-53. (in Chinese)

[17]

丘恒越, 张桂东, 陈思哲. 基于准Z源的低电容电压应力高增益DC-DC变换器[J]. 电源学报, 2024, 22(6): 1-12. Qiu Hengyue, Zhang Guidong, Chen Sizhe. High-gain DC-DC converter with low voltage stress of capacitor based on quasi-Z-source[J]. Journal of Power Supply, 2024, 22(6): 1-12. (in Chinese)

[18]

雷杨松. 准Z源光伏并网逆变器的设计[D]. 淄博: 山东理工大学, 2020. Lei Yangsong. Design of quasi-Z-source photovoltaic grid-connected inverter[D]. Zibo: Shandong University of Technology, 2020. (in Chinese)

[19]

潘冬华, 阮新波, 王学华, 等. 增强LCL型并网逆变器对电网阻抗鲁棒性的控制参数设计[J]. 中国电机工程学报, 2015, 35(10): 2558-2566. Pan Donghua, Ruan Xinbo, Wang Xuehua, et al. Controller design for LCL-type grid-connected inverter to achieve high robustness against grid-impedance variation[J]. Proceedings of the CSEE, 2015, 35(10): 2558-2566. (in Chinese)

[20]

汪颖, 孙建风, 肖先勇, 等. 改进加权平均电流反馈的LCL型逆变器控制方法[J]. 高电压技术, 2021, 47(8): 2678-2687. Wang Ying, Sun Jianfeng, Xiao Xianyong, et al. Control method of LCL inverter based on improved weighted average current feedback[J]. High Voltage Engineering, 2021, 47(8): 2678-2687. (in Chinese)

[21]

Lou Guannan, Gu Wei, Wang Jianhui, et al. A unified control scheme based on a disturbance observer for seamless transition operation of inverter-interfaced distributed generation[J]. IEEE Transactions on Smart Grid, 2018, 9(5): 5444-5454.

[22]

李春鹏, 贲洪奇, 刘博, 等. 采用扰动观测器的偏差解耦控制方法[J]. 中国电机工程学报, 2015, 35(22): 5859-5868. Li Chunpeng, Ben Hongqi, Liu Bo, et al. Deviation decouple control method based on disturbance observer[J]. Proceedings of the CSEE, 2015, 35(22): 5859-5868. (in Chinese)

[23]

曹文远, 韩民晓, 谢文强, 等. 基于扰动观测器的电压源型逆变器负载电流前馈控制及参数设计方法[J]. 电工技术学报, 2020, 35(4): 862-873. Cao Wenyuan, Han Minxiao, Xie Wenqiang, et al. A disturbance-observer-based load current feedforward control and parameter design method for voltage-sourced inverter[J]. Transactions of China Electrotechnical Society, 2020, 35(4): 862-873. (in Chinese)

[24]

干天助, 梁理程, 陈延礼, 等. 基于改进PCI控制器的光伏并网逆变器的直流分量抑制策略[J]. 太阳能学报, 2022, 43(7): 93-100. Gan Tianzhu, Liang Licheng, Chen Yanli, et al. DC component suppression of PV grid-connected inverter with improved PCI controller[J]. Acta Energiae Solaris Sinica, 2022, 43(7): 93-100. (in Chinese)

2025年第23卷第6期

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文章信息

doi: 10.13234/j.issn.2095-2805.2025.6.152

接收时间：2023-04-23
首发时间：2026-10-26
出版时间：2025-10-30

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收稿日期：2023-04-23
修回日期：2023-06-08
录用日期：2023-07-04

基金

Natural Science Fund Project of Henan Province(222300420400)

河南省自然科学基金面上项目(222300420400)

作者信息

^1.三峡大学电气与新能源学院，宜昌　443002

^2.河南城建学院电气与控制工程学院，平顶山　467036

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2种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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