电工技术学报  2018, Vol. 33 Issue (20): 4790-4801    DOI: 10.19595/j.cnki.1000-6753.tces.170929
电力电子 |
不平衡负载条件下三相四线制并联逆变器的下垂控制
陈杰, 赵冰, 陈新, 刘名凹, 龚春英
南京航空航天大学江苏省新能源发电与电能变换重点实验室 南京 211106
Droop Control of Three-Phase Four-Wire Parallel Inverters under Unbalanced Load Condition
Chen Jie, Zhao Bing, Chen Xin, Liu Ming’ao, Gong Chunying
Jiangsu Key Laboratory of New Energy Generation and Power Conversion Nanjing University of Aeronautics and Astronautics Nanjing 211106 China
全文: PDF (108475 KB)  
输出: BibTeX | EndNote (RIS)      
摘要 当微电网孤岛运行时,不平衡负载的接入不仅会造成逆变器输出电压畸变,也会影响多逆变器并联运行的功率均分。首先分析不平衡负载造成三相逆变器输出电压畸变的根本原因。在此基础上,结合分裂电容三相四线制拓扑和三维空间矢量脉宽调制(3D-SVPWM),提出一种零轴控制策略,实现输出电压零序分量的抑制和分裂电容的均压控制;同时,采用准谐振控制实现对输出电压负序分量的抑制。针对基于下垂控制的多逆变器并联运行情况,详细分析不平衡负载对输出功率均分的影响和基本关系,提出一种改进分序虚拟阻抗下垂控制方法,基于二次广义积分构造虚拟阻抗来减小各序分量下输出阻抗的差异,有效解决了不平衡负载造成的输出负序功率和零序电流无法均分的问题。仿真和实验结果验证了所提出方案的有效性。
服务
把本文推荐给朋友
加入我的书架
加入引用管理器
E-mail Alert
RSS
作者相关文章
关键词 不平衡负载三相四线制分序下垂控制虚拟阻抗    
Abstract:Under the island operation mode, unbalanced load in the micro-grid will not only cause the voltage distortion of the inverter, but also affect the power sharing of the parallel inverters. In this paper, the fundamental reason of the output voltage distortion is firstly analyzed. Then, based on the three-phase four-wire inverter topology of the split capacitor and 3D-SVPWM, a zero-axis control strategy is proposed to suppress the zero-sequence component of the output voltage and control the voltage balance of the split capacitors. Meanwhile, the quasi-resonant control is used to suppress the negative sequence component of the output voltage. Subsequently, the influence of the unbalanced load on output power and their basic relationship are analyzed in detail for the parallel operation of multi-inverters based on droop control. An improved sequential droop control method is proposed. The virtual impedance based on the second-order generalized integral is used to reduce difference among each sequence components of output impedance, which effectively solves the imbalance sharing problem of the negative sequence output power and zero sequence current caused by unbalanced load. Simulation and experimental results verify the effectiveness of the proposed scheme.
Key wordsUnbalanced load    three-phase four-wire    sequential droop control    virtual impedance   
收稿日期: 2017-07-02      出版日期: 2018-10-30
PACS: TM46  
基金资助:江苏省产学研合作前瞻性联合研究项目(BY2015003-05),台达环境与教育基金会《电力电子科教发展计划》(DREG2016006)和国家自然科学基金面上项目(51777095)资助
作者简介: 陈 杰 男,1982年生,博士,副教授,研究方向为微电网与分布式发电技术、并网逆变器的建模与控制技术、航空电源系统等。E-mail: chen_jie@nuaa.edu.cn(通信作者); 赵 冰 女,1993年生,硕士研究生,研究方向为电力电子系统建模等。E-mail: 476643117@qq.com
引用本文:   
陈杰, 赵冰, 陈新, 刘名凹, 龚春英. 不平衡负载条件下三相四线制并联逆变器的下垂控制[J]. 电工技术学报, 2018, 33(20): 4790-4801. Chen Jie, Zhao Bing, Chen Xin, Liu Ming’ao, Gong Chunying. Droop Control of Three-Phase Four-Wire Parallel Inverters under Unbalanced Load Condition. Transactions of China Electrotechnical Society, 2018, 33(20): 4790-4801.
链接本文:  
https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.170929          https://dgjsxb.ces-transaction.com/CN/Y2018/V33/I20/4790