基于坐标变换的微源逆变器虚拟复阻抗功率分配方法
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摘要
微电网中线路的阻抗特性与微源逆变器的功率解耦控制、环流抑制、电能质量等问题密切相关。针对传统虚拟阻抗控制容易引起公共连接点电压幅值跌落、控制鲁棒性差以及线路电阻漂移造成系统失稳等不足,提出基于坐标变换的微源逆变器虚拟复阻抗功率分配方法,通过引入虚拟复阻抗控制环实现并联运行的微源逆变器功率输出的精确解耦以及等效线路阻抗的匹配,从而使得负荷功率按微源逆变器容量比例进行精确分配。仿真和实验结果验证了所提控制方法的有效性。
The impedance characteristics of the line in microgrid are closely related to the power decoupling control of micro sources inverter, circulation suppression, power quality and so on.Traditional virtual impedance control can easily cause voltage drop of common connection point,control robustness difference, and the deficiency of system instability caused by line resistance drift, a virtual complex impedance power sharing method for micro sources inverter based on coordinate transformation is proposed, the power output of parallel micro sources inverter is decoupled precisely and the equivalent line impedance is matched by virtual complex impedance control loop, the load power is effectively distributed according to the capacity ratio of the micro sources inverter. Simulation and experimental results verify the proposed method.
The impedance characteristics of the line in microgrid are closely related to the power decoupling control of micro sources inverter, circulation suppression, power quality and so on.Traditional virtual impedance control can easily cause voltage drop of common connection point,control robustness difference, and the deficiency of system instability caused by line resistance drift, a virtual complex impedance power sharing method for micro sources inverter based on coordinate transformation is proposed, the power output of parallel micro sources inverter is decoupled precisely and the equivalent line impedance is matched by virtual complex impedance control loop, the load power is effectively distributed according to the capacity ratio of the micro sources inverter. Simulation and experimental results verify the proposed method.
引文
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[24]吴恒,阮新波,杨东升,等.虚拟同步发电机功率环的建模与参数设计[J].中国电机工程学报,201535(24):6508-6518.Wu Heng,Ruan Xinbo,Yang Dongsheng,et al.Modeling of the power loop and parameter design of virtual synchronous generators[J].Proceedings of the CSEE,2015,35(24):6508-6518.
[2]Sun Xiaofeng,Tian Yanjun,Chen Zhe.Adaptive decoupled power control method for inverter connected DG[J].Renewable Power Generation2014,8(2):171-182.
[3]方红伟,陶月,肖朝霞,等.并网逆变器并联系统的鲁棒控制与环流分析[J].电工技术学报,2017,32(18):248-258.Fang Hongwei,Tao Yue,Xiao Zhaoxia,et al.Robust control and circulating current analysis for gridconnected parallel inverters[J].Transactions of China Electrotechnical Society,2017,32(18):248-258.
[4]Rocabert J,Luna A,Blaabjerg F,et al.Control of power converters in AC microgrids[J].IEEE Transactions on Power Electronics,2012,27(11):4734-4749.
[5]周贤正,荣飞,吕志鹏,等.低压微电网采用坐标旋转的虚拟功率V/f下垂控制策略[J].电力系统自动化,2012,36(2):47-51.Zhou Xianzheng,Rong Fei,LüZhipeng,et al.Acoordinate rotational transformation based virtual power V/f droop control method for low voltage microgrid[J].Automation of Electric Power Systems,2012,36(2):47-51.
[6]李培强,董彦婷,段克会,等.直流微电网双向AC/DC变换器并联系统控制策略仿真研究[J].电力系统保护与控制,2017,45(17):43-50.Li Peiqiang,Dong Yanting,Duan Kehui,et al.Simulation study for control strategy of bi-directional AC/DC converter parallel system in DC microgrid[J].Power System Protection and Control,2017,45(17):43-50.
[7]赵卓立,杨苹,郑成立,等.微电网动态稳定性研究述评[J].电工技术学报,2017,32(10):111-122.Zhao Zhuoli,Yang Ping,Deng Chengli,et al.Review on dynamic stability research of microgrid[J].Transactions of China Electrotechnical Society,2017,32(10):111-122.
[8]马皓,林钊,林燎源.基于多智能体的三相逆变器并联系统功率灵活分配[J].电工技术学报,2017,32(2):216-227.Ma Hao,Lin Zhao,Lin Liaoyuan.Flexible power distribution for three-phase parallel inverters based on multi-agent systems[J].Transactions of China Electrotechnical Society,2017,32(2):216-227.
[9]Guerrero J M,Hang L,Uceda J.Control of distributed uninterruptible power supply systems[J].IEEETransactions on Industrial Electronics,2008,55(8):2845-2859.
[10]陈丽娟,王致杰.基于改进下垂控制的微电网运行控制研究[J].电力系统保护与控制,2016,44(4):16-21.Chen Lijuan,Wang Zhijie.Research of operation control of micro-grid based on improved droop control[J].Power System Protection and Control2016,44(4):16-21.
[11]Yao Zhang,Hao Ma.Theoretical and experimental investigation of networked control for parallel operation of inverters[J].IEEE Transactions on Industrial Electronics,2012,59(4):1961-1970.
[12]王成山,肖朝霞,王守相.微网中分布式电源逆变器的多环反馈控制策略[J].电工技术学报,2009,24(2):100-107.Wang Chengshan,Xiao Zhaoxia,Wang Shouxiang.Multiple feedback loop control scheme for inverters of the micro source in microgrids[J].Transactions of China Electrotechnical Society,2009,24(2):100-107.
[13]张庆海,罗安,陈燕东,等.并联逆变器输出阻抗分析及电压控制策略[J].电工技术学报,2014,29(6):98-105.Zhang Qinghai,Luo An,Chen Yandong,et al.Analysis of output impedance for parallel inverters and voltage control strategy[J].Transactions of China Electrotechnical Society,2014,29(6):98-105.
[14]李浩然,杨旭红,冯成臣.多逆变器并联下的输出阻抗分析和改进下垂控制策略研究[J].电力系统保护与控制,2015,43(20):29-35.Li Haoran,Yang Xuhong,Feng Chengchen.Control strategy research of output impedance analysis and improved droop control based on multiple-inverters parallel[J].Power System Protection and Control,2015,43(20):29-35.
[15]Yao W,Chen M,Matas J,et al.Design and analysis of the droop control method for parallel inverters considering the impact of the complex impedance on the power sharing[J].IEEE Transactions on Industrial Electronics,2011,58(2):576-588.
[16]Li Bin,Zhou Lin,Yu Xirui,et al.New control scheme of power decoupling based on virtual synchronous generator[C]//IEEE Power and Energy Conference at Illinois(PECI),2016,1:1-8.
[17]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,201434(12):1844-1852.Zhang Ping,Shi Jianjiang,Li Ronggui,et al.Acontrol strategy of‘virtual negative’impedance for inverters in low-voltage microgrid[J].Proceedings of the CSEE,2014,34(12):1844-1852.
[18]Xu Shungang,Wang Jinping,Xu Jianping.A current decoupling parallel control strategy of single-phase inverter with voltage and current dual closed-loop feedback[J].IEEE Transactions on Industrial Electronics,2013,60(4):1306-1313.
[19]胡伟,孙建军,查晓明,等.基于动态相量法的逆变型分布式电源微电网建模与仿真[J].电力系统自动化,2014,38(3):14-18.Hu Wei,Sun Jianjun,Zha Xiaoming,et al.Modeling and simulation of microgrid including inverterinterfaced distributed resources based on dynamic phasors[J].Automation of Electric Power Systems,2104,38(3):14-18.
[20]高范强,王平,李耀华,等.基于时变相量小信号模型的逆变器并联控制系统分析与设计[J].中国电机工程学报,2011,31(33):75-84.Gao Fanqiang,Wang Ping,Li Yaohua,et al.Analysis and design of for paralleled inverter system[J].Proceedings of the CSEE,2011,31(33):75-84.
[21]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.Zhen TianWen,Chen Laijun,Chen Tianyi,et al Review and prospect of virtual synchronous generator technologies[J].Power System Protection and Control,2015,39(21):165-175.
[22]Bevrani H,Shokoohi S.An intelligent droop control for simultaneous voltage and frequency regulation in islanded microgrids[J].IEEE Transactions on Smart Grid,2013,4(3):1505-1513.
[23]Asiminoaei L,Teodorescu R,Blaabjerg F,et al.Adigital controlled PV-inverter with grid impedance estimation for ENS detection[J].IEEE Transactions on Power Electronics,2005,20(6):1480-1490.
[24]吴恒,阮新波,杨东升,等.虚拟同步发电机功率环的建模与参数设计[J].中国电机工程学报,201535(24):6508-6518.Wu Heng,Ruan Xinbo,Yang Dongsheng,et al.Modeling of the power loop and parameter design of virtual synchronous generators[J].Proceedings of the CSEE,2015,35(24):6508-6518.