单相CHB光伏并网逆变系统谐波补偿策略研究*

doi:10.11985/2023.02.022

电气工程学报 ›› 2023, Vol. 18 ›› Issue (2): 221-228.doi: 10.11985/2023.02.022

• 新能源发电与电能存储 • 上一篇下一篇

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单相CHB光伏并网逆变系统谐波补偿策略研究^*

周杰¹(), 黎明²(), 李立伟³(), 于文山¹(), 李学庆¹(), 由蕤¹()

1.青岛大学电气工程学院青岛 266071
2.中国海洋大学工程学院青岛 266100
3.青岛大学威海创新研究院威海 264200

收稿日期:2021-12-21 修回日期:2022-10-12 出版日期:2023-06-25 发布日期:2023-07-12
通讯作者: 由蕤，男，1984年生，博士，副教授。主要研究方向为分布式发电与微电网。E-mail：yourui1984@163.com
作者简介:周杰，男，1996年生，硕士研究生。主要研究方向为级联H桥逆变器控制。E-mail：1017048370@qq.com
黎明，男，1975年生，博士，教授。主要研究方向为智能信号处理与智能控制、海洋能发电系统。E-mail：limingneu@ouc.edu.cn
李立伟，男，1970年生，博士，教授。主要研究方向为电力系统故障诊断、高速列车运行监测及控制。E-mail：ytllw@163.com
于文山，男，1996年生，硕士研究生。主要研究方向为微电网运行优化。E-mail：qluyuwenshan@163.com
李学庆，男，1997年生，硕士研究生。主要研究方向为级联H桥光伏并网逆变器。E-mail：13589106335@163.com
基金资助:
山东省重点研发计划(重大科技创新工程)(2019JZZY010902);山东省自然科学基金(ZR2020ME197);国家自然科学基金(51761135014)

Research on Harmonic Compensation Strategy of Single-phase CHB Photovoltaic Grid-connected Inverter System

ZHOU Jie¹(), LI Ming²(), LI Liwei³(), YU Wenshan¹(), LI Xueqing¹(), YOU Rui¹()

1. College of Electrical Engineering, Qingdao University, Qingdao 266071
2. College of Engineering, Ocean University of China, Qingdao 266100
3. Weihai Institute of Innovation, Qingdao University, Weihai 264200

Received:2021-12-21 Revised:2022-10-12 Online:2023-06-25 Published:2023-07-12

摘要/Abstract

摘要：

受部分遮挡、自身损坏等因素的影响，单相级联H桥光伏并网逆变系统的H桥模块间传输功率不平衡，导致传输功率高的H桥模块易发生过调制，造成并网电流的恶化，甚至影响系统的稳定运行。为此，提出一种优化的三次谐波补偿策略，通过对过调制模块补偿三次谐波的准确计算，使其调制波幅值为1。同时，结合反相三次谐波在正常模块间的优化分配，最大限度地避免各H桥模块过调制的发生。在Matlab/Simulink中搭建仿真模型，将采用所提控制策略与常规三次谐波补偿策略、混合调制策略的仿真结果进行对比，对所提控制策略的优良性能进行验证。

关键词: 级联H桥, 功率不平衡, 过调制, 三次谐波补偿

Abstract:

Affected by partial shading, self damage and other factors, the transmission power between H-bridge modules of single-phase cascaded H-bridge photovoltaic grid-connected inverter system is unbalanced. As a result, the H-bridge module with high transmission power is prone to overmodulation, which leads to the deterioration of grid current and even affects the stable operation of the system. Therefore, an optimized third harmonic compensation strategy is proposed, through the accurate calculation of the third harmonic compensated by the overmodulation module, the amplitude of their modulation wave is 1. At the same time, combined with the optimal distribution of inverse third harmonic among the normal modules, the overmodulation of each H-bridge module is avoided to the maximum extent. The simulation model is built in Matlab/Simulink, and the simulation results of the proposed control strategy are compared with the conventional third harmonic compensation strategy and hybrid modulation strategy, and the excellent performance of the proposed control strategy is verified.

Key words: Cascaded H-bridge, power unbalance, overmodulation, third harmonic compensation

中图分类号:

TM464

周杰, 黎明, 李立伟, 于文山, 李学庆, 由蕤. 单相CHB光伏并网逆变系统谐波补偿策略研究^*[J]. 电气工程学报, 2023, 18(2): 221-228.

ZHOU Jie, LI Ming, LI Liwei, YU Wenshan, LI Xueqing, YOU Rui. Research on Harmonic Compensation Strategy of Single-phase CHB Photovoltaic Grid-connected Inverter System[J]. Journal of Electrical Engineering, 2023, 18(2): 221-228.

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拟合系数	数值	拟合系数	数值
c₁	15 169	c₄	-184 620
c₂	-80 996	c₅	98 487
c₃	173 041	c₆	-21 835

参数	数值
最大功率/W	262.5
最大功率点电压/V	35
最大功率点电流/A	7.5
短路电流/A	8.2
开路电压/V	44.5

参数	数值
相电压幅值/V	110
滤波电感/mH	3
直流侧电容/mF	35
电网频率/Hz	50
载波频率/Hz	2 000
H桥模块数	4

单相CHB光伏并网逆变系统谐波补偿策略研究^*

Research on Harmonic Compensation Strategy of Single-phase CHB Photovoltaic Grid-connected Inverter System

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