基于U-I下垂的同步定频微网孤岛运行控制策略研究
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摘要
微网孤岛运行时,由于微网中各输电线路表现为高R/X特性,导致采用下垂控制的分布式电源(DG)有功无功耦合,难以按其各自的容量对功率进行合理分配。提出一种新的基于U-I下垂的全逆变器型微网控制方法,用于微网孤岛运行时功率分配控制。每个全逆变器工作在电压控制模式下,经派克变换后的d轴和q轴电压根据d轴和q轴电流实现下垂控制,且同步相量测量(PMU)装置用来提供全局同步参考信号,消除了传统相角测量带来的误差。最后,通过Matlab/Simulink搭建模型进行仿真。仿真结果表明,所提出的控制策略能够对有功无功解耦控制,使功率在不同DG间合理分配,且保证了DG单元的即插即用性。
The transmission lines in the microgrid have high R/X characteristics during the operation of micro - grid islanding,which leads to the active-reactive coupling existing in distributed generation(DG)with droop control,and the power is difficult to allocate rationally according to the respective capacity. A new full-inverter micro-grid control method based on U-I drooping is proposed,and is used for power distribution control during the operation of micro-grid islanding. Each full-inverter operates in voltage control mode. The droop control of d-axis and q-axis voltage after Park transform is realized according the d-axis and q-reference signal to eliminate the error caused by traditional phase angle measurement. The Matlab/Simulink is used to build the model for simulation. Simulation results show that the proposed control strategy can realize the active and reactive decoupled control,distribute the power rationally among different DGs,and ensure the plug-and-play performance of DG unit.
The transmission lines in the microgrid have high R/X characteristics during the operation of micro - grid islanding,which leads to the active-reactive coupling existing in distributed generation(DG)with droop control,and the power is difficult to allocate rationally according to the respective capacity. A new full-inverter micro-grid control method based on U-I drooping is proposed,and is used for power distribution control during the operation of micro-grid islanding. Each full-inverter operates in voltage control mode. The droop control of d-axis and q-axis voltage after Park transform is realized according the d-axis and q-reference signal to eliminate the error caused by traditional phase angle measurement. The Matlab/Simulink is used to build the model for simulation. Simulation results show that the proposed control strategy can realize the active and reactive decoupled control,distribute the power rationally among different DGs,and ensure the plug-and-play performance of DG unit.
引文
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[4]姚骏,杜红彪,周特,等.微网逆变器并联运行的改进下垂控制策略[J].电网技术,2015,39(4):932-938.YAO Jun,DU Hongbiao,ZHAO Te,et al. A modified droop control strategy for parallel operation of microgrid inverters[J].Power system technology,2015,39(4):932-938.
[5] WANG Wenyuan,BARNES M. Power flow algorithms for multi-terminal VSC-HVDC with droop control[J]. IEEE transactions on power systems,2014,29(4):1721-1730.
[6]江晨,曾国宏,吴学智,等.双极性直流微网的分层控制策略[J].电网技术,2015,39(8):2217-2222.JIANG Chen,ZENG Guohong,WU Xuezhi,et al. Hierarchi-cal control strategy for bipolar DC microgrid[J]. Power system technology,2015,39(8):2217-2222.
[7] ZHANG Lirong,WANG Yi,LI Heming,et al. Hierarchical co-ordinated control of DC microgrid with wind turbines[C]//2012IEEE the 38th Annual Conference on Industrial Electronics So-ciety. Montreal:IEEE,2012:3547-3552.
[8]郭蕾,苏建徽,施永.微网孤岛运行模式下的调频控制策略[J].电力系统自动化,2017,41(8):110-115.GUO Lei,SU Jianhui,SHI Yong. Frequency modulation con-trol strategy under microgrid operation mode[J]. Automation of electric power systems,2017,41(8):110-115.
[9]李聪.基于下垂控制的微电网运行仿真及小信号稳定性分析[D].成都:西南交通大学,2013.LI Cong. Microgrid operation simulation and small signal stabi-lity analysis based on droop control[D]. Chengdu:Southwest Jiaotong University,2013.
[10]余辛,刘敏,刘君. PMU在配电网的应用综述[J].贵州电力技术,2016,19(6):60-64.YU Xin,LIU Min,LIU Jun. An overview of application of PMU in distribution network[J]. Guizhou electric power tech-nology,2016,19(6):60-64.
[11] YANG Han,PAN Shen,GUERRERO J M. Control strategies for islanded microgrid using enhanced hierarchical control structure with multiple current-loop damping schemes[J].IEEE transactions on smart grid,2017,8(3):1139-1153.