基于虚拟同步发电机控制技术的能量路由器交直流协调控制
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摘要
作为能源互联网的关键设备,能量路由器的电路拓扑和控制策略与可再生能源接纳、灵活电力变换息息相关。基于虚拟电机理论,提出一种能量路由器拓扑结构,对此结构的交、直流端口均采用虚拟同步发电机控制,以实现对交、直流接口能量的协调控制。分别建立了虚拟直流电机和虚拟交流电机控制数学模型,以实现交、直流侧协调控制;并针对直流侧突增负荷、电网频率突增和突减三种工况,验证了所提出的能量路由器在拓扑结构、能量流动、维持母线电压稳定的正确性。并且在MATLAB中与传统的下垂控制进行了比较研究,对比研究结果显示下垂控制具有调节速度较快的优点,但超调大,变化较为突兀的缺点;而虚拟电机控制方法则由于具备阻尼和惯性特性的优越性,所以超调小,调节则较为平缓有利于系统的稳定运行。所提出的控制策略为能量路由器的稳定运行提出了一种新的解决方案。
As the key equipment of the energy internet,the circuit topology and control strategy of energy routers are closely related to the acceptance of renewable energy and flexible power conversion.An energy router topology is proposed in this paper.The AC and DC ports in the structure are controlled by the virtual synchronous generator to achieve the coordinated control of the AC/DC interface energy.Models of DC-VSG controller and the AC-VSG are established to realize the coordinated control of the AC and DC side,respectively.With the proposed method,the paper verified the correctness of the proposed energy router topology,the energy flow and the stability of the bus voltage under three operation conditions of DC-side load sudden increasing,system frequency sudden increasing and decreasing.The proposed control method is compared with the traditional droop control in MATLAB.Droop control has the advantages of fast adjusting but with larger overshoot and more abrupt change.The VSG control has better damping and inertia characteristics,which is helpful to the stable operation of the system.The proposed control strategy presents a new type of solution for the stable operation of energy routers.
As the key equipment of the energy internet,the circuit topology and control strategy of energy routers are closely related to the acceptance of renewable energy and flexible power conversion.An energy router topology is proposed in this paper.The AC and DC ports in the structure are controlled by the virtual synchronous generator to achieve the coordinated control of the AC/DC interface energy.Models of DC-VSG controller and the AC-VSG are established to realize the coordinated control of the AC and DC side,respectively.With the proposed method,the paper verified the correctness of the proposed energy router topology,the energy flow and the stability of the bus voltage under three operation conditions of DC-side load sudden increasing,system frequency sudden increasing and decreasing.The proposed control method is compared with the traditional droop control in MATLAB.Droop control has the advantages of fast adjusting but with larger overshoot and more abrupt change.The VSG control has better damping and inertia characteristics,which is helpful to the stable operation of the system.The proposed control strategy presents a new type of solution for the stable operation of energy routers.
引文
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[3]潘岱栋.基于虚拟同步发电机的VSC变换器控制策略研究[D].吉林:东北电力大学,2016.
[4]毛福斌.微网逆变器的虚拟同步发电机控制策略研究[D].合肥:合肥工业大学,2016.
[5]刘振亚.全球能源互联网[M].北京:中国电力出版社,2015.
[6]张玉治,张辉,贺大为,等.具有同步发电机特性的微电网逆变器控制[J].电工技术学报,2014,29(7):261-268.ZHANG Yuzhi,ZHANG Hui,HE Dawei,et al.Control strategy of micro grid converters with synchronous generator characteristic[J].Transactions of China Electrotechnical Society,2014,29(7):261-268.
[7]赖柏竹,吴靖,章玮明,等.基于电力电子变压器的能量路由器研究[J].浙江电力,2017,36(8):7-12.LAI Baizhu,WU Jing,ZHANG Weiming,et al.Research on energy router based on power electronic transformer[J].Zhejiang Electric Power,2017,36(8):7-12.
[8]曹阳,袁立强,朱少敏,等.面向能源互联网的配网能量路由器关键参数设计[J].电网技术,2015,39(11):3094-3101.CAO Yang,YUAN Liqiang,ZHU Shaomin,et al.Parameter design of energy router orienting energy internet[J].Power System Technology,2015,39(11):3094-3101.
[9]陈静鹏,余志文,艾芊.面向能源互联网的能量路由器研究[J].电器与能效管理技术,2015(24):10-15.CHEN Jingpeng,YU Zhiwen,AI Qian.Study on power router oriented to energy internet system.[J].Electric Appliance and Energy Efficiency Management Technology,2015(24):10-15.
[10]D′ARCO S,SUUL J A,FOSSO O B.A virtual synchronous machine implementation for distributed control of power converters in smartgrids[J].Electric Power Systems Research,2015(122):180-197.
[11]HUANG A Q,CROW M L,THOMAS,et al.The future renewable electric energy delivery and management(FREEDM)system[J].Proceedings of the IEEE,2011,99(1):133-148.
[12]LI Fangxing,QIAO Wei,SUN Hongbin,et al.Smart transmission grid:vision and framework[J].IEEE Transactions on Smart Grid,2010,1(2):168-177.