电工技术学报  2019, Vol. 34 Issue (19): 4143-4153    DOI: 10.19595/j.cnki.1000-6753.tces.L80765
电力系统 |
基于分散式微电网的虚拟同步发电机无通信预同步并网方案
颜湘武, 王德胜, 贾焦心
新能源电力系统国家重点实验室(华北电力大学) 北京 102206
Non-Communication Pre-Synchronization Scheme of VSGs Based on Decentralized Microgrids
Yan Xiangwu, Wang Desheng, Jia Jiaoxin
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China
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摘要 分散式微电网结构因为设备间无通信,具有成本低、稳定性好的优势而成为研究热点,但是其多机预同步并网却成为技术难点。该文针对分散式结构,提出利用一台虚拟同步发电机(VSG)进行无通信的预同步控制方案,并通过引入电流限幅环节解决环流问题。首先介绍了基于虚拟功率的预同步原理和三种多VSG预同步方案;其次,采用小信号模型对比分析了两种相位预同步控制器的性能,采用VSG并联系统频率等效模型对预同步过程中的有功环流问题进行理论分析,采用等值机的方法对一阶虚拟惯性环节参数进行整定;最后进行仿真和实验验证。结果表明,该文的预同步方法能够减小多VSG并联系统的动态功率环流,满足快速预同步并网,进而实现分布式电源间的无缝切换控制。
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颜湘武
王德胜
贾焦心
关键词 虚拟同步发电机预同步虚拟功率分散式功率环流    
Abstract:The new decentralized micro-grid structure has become the focus of research in recent years because of no communication between equipments, low cost and good stability, but its multi machine pre-synchronous grid connection has become a technical difficulty. In view of the decentralized structure, a non-communication pre-synchronous control scheme is proposed by using single VSG, and the current limitation is adopted to solve the circulation. Firstly, there are introductions to the principle of pre-synchronization based on virtual power and three pre-synchronization methods of multi-parallel VSGs. Secondly, the performance of two phase pre-synchronization controllers is analyzed by the small signal model; the theoretical analysis on the active power circulation problem is carried out by equivalent frequency model for parallel VSGs in the pre-synchronization process; the parameters of first-order virtual inertia link are designed by equivalent VSG. Finally, the simulation and experiment results of three pre-synchronization methods show that the proposed pre-synchronization method can not only reduce the dynamic power circulation of parallel VSGs but also actualize the fast-pre-synchronization control, and then the seamless switching control of DGs can be realized.
Key wordsVSG    pre-synchronization    virtual power    decentralized    power circulation   
收稿日期: 2018-07-11      出版日期: 2019-10-12
PACS: TM74  
基金资助:河北省自然科学基金项目(E2018502134)和国网辽宁省电力有限公司2018年科技项目“考虑源、荷波动特征的电网无功电压优化策略和评价指标研究”资助
通讯作者: 王德胜 男,1994年生,博士研究生,研究方向为微网运行及接口变换器控制。E-mail:deshengw@foxmail.com   
作者简介: 颜湘武 男,1965年生,教授,博士生导师,研究方向为新能源电力系统分析与控制、现代电力变换、新型储能与节能技术。E-mail:xiangwuy@ncepu.edu.cn
引用本文:   
颜湘武, 王德胜, 贾焦心. 基于分散式微电网的虚拟同步发电机无通信预同步并网方案[J]. 电工技术学报, 2019, 34(19): 4143-4153. Yan Xiangwu, Wang Desheng, Jia Jiaoxin. Non-Communication Pre-Synchronization Scheme of VSGs Based on Decentralized Microgrids. Transactions of China Electrotechnical Society, 2019, 34(19): 4143-4153.
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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.L80765          https://dgjsxb.ces-transaction.com/CN/Y2019/V34/I19/4143