虚拟同步发电机频率稳定性分析
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摘要
在电力电子逆变器控制领域,通过仿真同步发电机的同步特性来实现的虚拟同步发电机(VSG)技术作为近年来提高电力系统稳定性的主要手段得到了充分的研究,在一定程度上解决了分布式能源(DG)并网系统缺少惯性的问题,提高了系统电网频率的稳定性。然而,当电网强度发生变化时,原有的VSG控制策略并不能维持系统频率稳定性。为了进一步提升VSG对频率稳定性的作用,在传统VSG控制策略的基础上,对电网强度变化时VSG系统的频率稳定性进行了分析,研究了影响电网强度变化的因素,并在此基础上提出,可以通过增大VSG中系统惯量的方法来提高电网强度变化时频率稳定性。最后,通过MATLAB/Simulink仿真工具,验证了所提方法的有效性。
In the field of power electronic inverter control,the virtual synchronous generator( VSG) technology realized by simulating the synchronous characteristics of synchronous generator had been fully researched as the main means to improve the stability of power system in recent years. And the stability of the system grid frequency was improved by solving the problem of the inertia of the distributed energy( DG) grid-connected system. However,when the power grid strength changes,the original VSG control strategy could not maintain the system frequency stability. In order to further improve the effect of VSG on frequency stability,the frequency stability of VSG system when the strength of grid is changed on the basis of traditional VSG control strategy was analyzed,and studies the factors that affect the change of power intensity. It was suggested that the frequency stability can be improved by increasing the system inertia in VSG. Finally, the effectiveness of the proposed method was verified by MATLAB/Simulink simulation tool.
In the field of power electronic inverter control,the virtual synchronous generator( VSG) technology realized by simulating the synchronous characteristics of synchronous generator had been fully researched as the main means to improve the stability of power system in recent years. And the stability of the system grid frequency was improved by solving the problem of the inertia of the distributed energy( DG) grid-connected system. However,when the power grid strength changes,the original VSG control strategy could not maintain the system frequency stability. In order to further improve the effect of VSG on frequency stability,the frequency stability of VSG system when the strength of grid is changed on the basis of traditional VSG control strategy was analyzed,and studies the factors that affect the change of power intensity. It was suggested that the frequency stability can be improved by increasing the system inertia in VSG. Finally, the effectiveness of the proposed method was verified by MATLAB/Simulink simulation tool.
引文
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[13]曾正,杨欢,赵荣祥,等.多功能并网逆变器研究综述[J].电力自动化设备,2012,32(8):5-15.
[14]LISERRE M,TEODORESCU R,BLAABJERG F.Stability of photovoltaic and wind turbine gridconnected inverters for a large set of grid impedance values[J].IEEE Trans on Power Electronics,2006,21(1):263-272.
[15]KARAPANOS V,KOTSAMPOPOULOS P,HATZIARGYRIOU N.Performance of the linear and binary algorithm of virtual synchronous generators for the emulation of rotational inertia[J].Electric Power Systems Research,2015(123):119-127.
[2]刘振亚.中国电力与能源[M].北京:中国电力出版社,2012.
[3]LASSETER R.Microgrids[C]∥IEEE Power Engineering Society Winter Meeting,USA,2002:305-308.
[4]杨占刚.微网实验系统研究[D].天津:天津大学,2010.
[5]丁明,杨向真,苏建徽.基于虚拟同步发电机思想的微电网逆变电源控制策略[J].电力系统自动化,2009,33(8):89-93.
[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(27):165-175.
[7]ZHONG Q C,WEISS G.Synchronverters:Inverters that mimic synchronous generators[J].IEEE Transactions on Industrial Electronics,2011,58(4):1259-1267.
[8]ZHONG Q C,NGUYEN P L,MA Z Y,et al.Selfsynchronized synchronverters:Inverters without a dedicated synchronization unit[J].IEEE Transactions on Power Electronics,2014,29(2):617-630.
[9]杨向真,苏建徽,丁明,等.微电网孤岛运行时的频率控制策略[J].电网技术,2010,8(5):76-79.
[10]田雨青,郑天文,陈来军,等.基于自适应调节的虚拟同步发电机频率控制[J].南方电网技术,2014,8(5):76-79.
[11]ALIPOOR J,MIURA Y,ISE T.Distributed generation grid integration using virtual synchronous generator with adaptive virtual inertia[C]∥Energy Conversion Congress and Exposition,2013:4546-4552.
[12]ALIPOOR J,MIURA Y,ISE T.Power system stabilization using virtual synchronous generator with Alternating moment of inertia[J].IEEE Journal Emerging and Selected Topics in Power Electronics,2014,3(2):451-458.
[13]曾正,杨欢,赵荣祥,等.多功能并网逆变器研究综述[J].电力自动化设备,2012,32(8):5-15.
[14]LISERRE M,TEODORESCU R,BLAABJERG F.Stability of photovoltaic and wind turbine gridconnected inverters for a large set of grid impedance values[J].IEEE Trans on Power Electronics,2006,21(1):263-272.
[15]KARAPANOS V,KOTSAMPOPOULOS P,HATZIARGYRIOU N.Performance of the linear and binary algorithm of virtual synchronous generators for the emulation of rotational inertia[J].Electric Power Systems Research,2015(123):119-127.