独立微网中并网逆变器自抗扰控制辅助调频算法
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摘要
针对独立微网系统暂态频率稳定性较差的问题,提出了典型光-风-储交直流混合微网中并网逆变器采用自抗扰控制的暂态辅助调频控制方法。首先,分析了常规PD控制辅助调频算法的结构和原理。然后,从抑制系统功率扰动的角度分析了微网同步发电机调频原理,推导了自抗扰控制器的设计。最后,通过仿真模型和实验平台进行验证,对比分析了无辅助功率调频、常规PD控制辅助调频和自抗扰控制辅助调频的系统频率扰动,得出所设计的自抗扰控制器的调频能力明显提升,且具有一定抗参数扰动能力,在独立微网辅助调频控制中有较强应用价值。
In order to improve the transient frequency stability of the stand-alone micro-grid system,the auto-disturbance rejection control( ADRC) method is applied in the grid-connected inverter in a typical PV-WT-SB AC/DC hybrid micro-grid to enable it to participate in the transient frequency regulation.First,the structure and principle of a conventional proportional differential( PD) control auxiliary frequency regulation algorithm were analyzed. Then,from the point of view of restraining system power disturbance,the principle of frequency regulation of micro-grid synchronous generator was analyzed and the design of ADRC controller was deduced. Finally,the simulation model and experimental platform were used to verify the system frequency perturbations through without auxiliary power frequency regulation,conventional PD control auxiliary frequency regulation and ADRC auxiliary frequency regulation. It is concluded that the designed frequency regulation ability of the ADRC is obviously improved,and it has certain antiparameter disturbance ability. It has strong application value in the independent micro-grid auxiliary frequency regulation control.
In order to improve the transient frequency stability of the stand-alone micro-grid system,the auto-disturbance rejection control( ADRC) method is applied in the grid-connected inverter in a typical PV-WT-SB AC/DC hybrid micro-grid to enable it to participate in the transient frequency regulation.First,the structure and principle of a conventional proportional differential( PD) control auxiliary frequency regulation algorithm were analyzed. Then,from the point of view of restraining system power disturbance,the principle of frequency regulation of micro-grid synchronous generator was analyzed and the design of ADRC controller was deduced. Finally,the simulation model and experimental platform were used to verify the system frequency perturbations through without auxiliary power frequency regulation,conventional PD control auxiliary frequency regulation and ADRC auxiliary frequency regulation. It is concluded that the designed frequency regulation ability of the ADRC is obviously improved,and it has certain antiparameter disturbance ability. It has strong application value in the independent micro-grid auxiliary frequency regulation control.
引文
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[16]李文林,李钧涛.不确定系统的不确定项观测器设计[J].控制理论与应用,2007,24(6):933.LI Wenlin,LI Juntao.Uncertainty observers for uncertain systems[J].Control Theory and Applications,2007,24(6):933.
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[2]谢文浩,王建赜,纪延超.提高多逆变器并网运行稳定性的控制方法[J].哈尔滨理工大学学报,2018(1):70.XIE Wenhao,WANG Jianze,JI Yanchao.Research on control strategy for a multiple grid-connected-inverter system[J].Journal of Harbin University of Science and Technology,2018(1):70.
[3]米阳,王成山.基于负荷估计的光柴独立微网频率优化控制[J].中国电机工程学报,2013,33(34),115.MI Yang,WANG Chengshan.Frequency optimization control for isolated photovoltaic-diesel hybrid microgrid based on load estimation[J].Proceedings of the CSEE,2013,33(34),115.
[4]茆美琴,奚媛媛,张榴晨,等.基于Q学习的微网二次频率在线自适应控制[J].电力系统自动化,2015,39(20):26.MAO Meiqin,XI Yuanyuan,ZHANG Liuchen,et al.Q-learing algorithm based secondary frequecy adaptive online control in realtime operation for microgrids[J].Automation of Electric Power System,2015,39(20),26.
[5]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,2010,34(1):164.YANG Xiangzhen,SU Jianhui,DING Ming,et al.Research on frequency control for microgrid in islanded operation[J].Power System Technology,2010,34(1),164.
[6]赵晶晶,吕雪,符杨,等.基于双馈感应风力发电机虚拟惯量和桨距角联合控制的风光柴微电网动态频率控制[J].中国电机工程学报,2015,35(15),3815.ZHAO Jinjin,LV Xue,FU Yang,et al.Dynamic frequency control strategy of wind/photovoltaic/diesel microgrid based on DFIG virtual inertia control and pitch angle control[J].Proceedings of the CSEE,2015,35(15),3815.
[7]李辉,刘海涛,宋二兵,等.双馈抽水蓄能机组参与电网调频的改进虚拟惯性控制策略[J].电力系统自动化,2017,41(10):58.LI Hui,LIU Haitao,SONG Erbing,et al.Improved virtual inertial control strategy of doubly fed pumped storage unit for power network frequency modulation[J].Automation of Electric Power Systems,2017,41(10):58.
[8]侍乔明,王刚,马伟明,等.直驱永磁风电机组虚拟惯量控制的实验方法研究[J].中国电机工程学报,2015,35(8):2033.SHI Qiaoming,WANG Gang,MA Weiming,et al.An experimental study method of D-PMSG with virtual inertia control[J].Proceedings of the CSEE,2015,35(8),2033.
[9]孙凯.自抗扰控制策略在永磁同步电动机伺服系统中的应用研究与实现[D].天津:天津大学,2007.
[10]姚书龙,刘志刚,张桂南,等.基于自抗扰控制的牵引网网压低频振荡抑制方法[J].电网技术,2016,40(1):207.YAO Shulong,LIU Zhigang,ZHANG Guinan,et al.A novel approach based on ADRC to traction network voltage low frequency oscillation suppression research[J].Power System Technology,2016,40(1):207.
[11]唐艳梅.线性自抗扰控制器在孤岛微网负荷频率控制中的应用[D].保定:华北电力大学,2015.
[12]时珊珊,鲁宗相,闵勇,等.微电网孤网运行时的频率特性分析[J].电力系统自动化,2011,35(9):36.SHI Shanshan,LU Zongxiang,MIN Yong,et al.Analysis on frequency characteristics of islanded microgird[J].Automation of Electric Power System,2011,35(9),36.
[13]韩京清.自抗扰控制器及其应用[J].控制与决策,1998,13(1):19.HAN Jingqing.Auto-disturbance-rejection controller and its application[J].Control and Decision,1998,13(1):19.
[14]魏永清,许江宁,马恒.自抗扰控制器在陀螺稳定平台控制系统中的应用[J].电机与控制学报,2017,21(1):39.WEI Yongqing,XU Jiangning,MA Heng.Application of actiive disturbance rejection controller in gyro-stabilized platform control system[J].Electric Machines and Control,2017,21(1):39.
[15]刘星桥,丁网芳,李慧.复合自抗扰在三电机同步控制系统的应用[J].电机与控制学报,2018,22(2):108.LIU Xingqiao,DING Wangfang,LI Hui.Compound active disturbance rejection applied in three-motor synchronous control system[J].Electric Machines and Control,2018,22(2):108.
[16]李文林,李钧涛.不确定系统的不确定项观测器设计[J].控制理论与应用,2007,24(6):933.LI Wenlin,LI Juntao.Uncertainty observers for uncertain systems[J].Control Theory and Applications,2007,24(6):933.
[17]ROCABERT J,LUNA A,BLAABJERG F.Control of power converters in AC microgrids[J].IEEE Transaction on Power Electronics,2012,27(11):4734.
[18]刘金琨.先进PID控制MATLAB仿真[M].第4版.北京:电子工业出版社,2016:210-243.