离网模式下虚拟同步发电机三相不平衡电压的研究
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摘要
微网逆变器以其灵活和快响应的特点成为再生能源与电网能源交换的桥梁,但是大量的分布式电源接入电网后,其惯性与阻尼过少,对电网的稳定性和安全带来了巨大忧患。采用虚拟同步发电机技术,运用基于间接虚拟阻抗法的VSG建模方式;对VSG带不平衡负载时三相不平衡电压进行研究,并进行仿真实验来验证相关解决策略的有效性。
Microgrid inverters become the bridge between renewable energy and grid energy exchange because of its flexibility and fast response.However,after a large number of distributed power sources are connected to the grid,their inertia and damping are too small,which brings stability and safety to the grid a huge worry.In this paper,the principle and control strategy of virtual synchronous generator(VSG)are introduced.The indirect virtual impedance is used to built the model of virtual synchronous generator.Finally,the problem of Three phase unbalanced voltage in unbalanced load is studied in depth,and simulation experiments are carried out to verify the effect of the relevant solution strategy.
Microgrid inverters become the bridge between renewable energy and grid energy exchange because of its flexibility and fast response.However,after a large number of distributed power sources are connected to the grid,their inertia and damping are too small,which brings stability and safety to the grid a huge worry.In this paper,the principle and control strategy of virtual synchronous generator(VSG)are introduced.The indirect virtual impedance is used to built the model of virtual synchronous generator.Finally,the problem of Three phase unbalanced voltage in unbalanced load is studied in depth,and simulation experiments are carried out to verify the effect of the relevant solution strategy.
引文
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[3]ZHAO X,WU X H,MENG L X,et al.A direct voltage unbalance compensation microgrids[C].IEEE Applied Power Electronics Conference and Exposition(APEC),2015:3252-3259.
[4]张平,石健将,李荣贵,等.低压微网逆变器的“虚拟负阻抗”控制策略[J].中国电机工程学报,2014,34(12):1844-1852.
[5]董杰,李领南,张纯江,等.微电网中的有功功率和无功功率均分控制[J].电力系统自动化,2016,40(10):90-96.
[6]郑天文,陈来军,陈天一,等.虚拟同步发电机技术及展望[J].电力系统自动化,2015,39(21):165-175.
[7]曹元峥.基于虚拟同步发电机的微电网逆变器控制策略研究[D].合肥:合肥工业大学,2017.
[8]王学华,阮新波,刘尚伟.抑制电网背景谐波影响的并网逆变器控制策略[J].中国电机工程学报,2011,31(6):7-14.
[9]孟建辉,石新春,王毅,等.改善微电网频率稳定性的分布式逆变电源控制策略[J].电工技术学报,2015,30(4):70-79.
[10]杨向真.微网逆变器及其协调控制策略研究[D].合肥:合肥工业大学,2011.
[11]吕志鹏,罗安,蒋雯倩,等.多逆变器环境微网环流控制新方法[J].电工技术学报,2012,27(1):40-47.
[12]BARTOSZ WOJSZCZYK,OMAR AL-JUBURI,王靖.分布式发电的高覆盖率对电力系统设计和运行的影响分析(英文)[J].电网技术,2009,33(15):37-46.
[13]叶金根.并网光伏电站的电能质量评估及运行特性分析[D].合肥:安徽大学,2012.
[14]吴云亚,谢少军,阚加荣,等.逆变器侧电流反馈的LCL并网逆变器电网电压前馈控制策略[J].中国电机工程学报,2013,33(6):54-60,9.
[15]尚磊,胡家兵,袁小明,等.电网对称故障下虚拟同步发电机建模与改进控制[J].中国电机工程学报,2017,37(2):403-412.
[16]王凯.微电网中逆变器控制策略及模式切换技术研究[D].徐州:中国矿业大学,2016.