风火打捆外送系统次同步振荡的改进自抗扰直流附加阻尼控制
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摘要
针对送端电网大规模风电接入可能加剧火电机组次同步振荡的问题,提出一种基于改进遗传算法的自抗扰附加阻尼控制方法。利用基于总体最小二乘法-旋转不变技术的信号参数估计(TLS-ESPRIT)算法对系统进行次同步振荡特性辨识,根据主模比指标选择合适的控制反馈信号,得到系统在次同步频段内各振荡模式对应的低阶传递函数;结合时间乘绝对误差积分准则(ITAE)指标与极大极小值原理确定被控系统控制目标,并利用改进遗传算法寻优确定多通道自抗扰控制器参数。在PSCAD上搭建含大规模风电的测试系统模型,仿真结果表明基于改进自抗扰控制的附加次同步阻尼控制器在送端电网多种运行方式和不同故障情况下都能有效抑制汽轮发电机组的次同步振荡,鲁棒性较强,同时低阶自抗扰控制器也具有令人满意的控制效果。
Aiming at the problem that the interconnection of large-scale wind power to the sending end of power grid may intensify the subsynchronous oscillation of thermal power units,an active disturbance rejection damping control method based on improved genetic algorithm is proposed. The TLS-ESPRIT( Total Least Squares-Estimation of Signal Parameters via Rotational Invariance Techniques) algorithm is used to identify the subsynchronous oscillation characteristics of the power system,the suitable feedback signal is selected according to the dominant mode ratio index,and the low-order transfer functions corresponding to each oscillation mode in subsynchronous frequency band are obtained,and the control objectives of controlled system are determined by combining the ITAE( Integral Time Absolute Error) index and the minimax principle,and the parameters of multi-channel active disturbance rejection controller are searched by the improved genetic algorithm. A test system model with large-scale wind power is constructed on PSCAD,and the simulative results show that the supplementary subsynchronous damping controller based on the improved active disturbance rejection control can effectively suppress the subsynchronous oscillation of steam turbine units under multiple operation modes and fault conditions of sending power grid,and it has strong robustness and satisfactory control effect.
Aiming at the problem that the interconnection of large-scale wind power to the sending end of power grid may intensify the subsynchronous oscillation of thermal power units,an active disturbance rejection damping control method based on improved genetic algorithm is proposed. The TLS-ESPRIT( Total Least Squares-Estimation of Signal Parameters via Rotational Invariance Techniques) algorithm is used to identify the subsynchronous oscillation characteristics of the power system,the suitable feedback signal is selected according to the dominant mode ratio index,and the low-order transfer functions corresponding to each oscillation mode in subsynchronous frequency band are obtained,and the control objectives of controlled system are determined by combining the ITAE( Integral Time Absolute Error) index and the minimax principle,and the parameters of multi-channel active disturbance rejection controller are searched by the improved genetic algorithm. A test system model with large-scale wind power is constructed on PSCAD,and the simulative results show that the supplementary subsynchronous damping controller based on the improved active disturbance rejection control can effectively suppress the subsynchronous oscillation of steam turbine units under multiple operation modes and fault conditions of sending power grid,and it has strong robustness and satisfactory control effect.
引文
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[14]李明节,于钊,许涛,等.新能源并网系统引发的复杂振荡问题及其对策研究[J].电网技术,2017,41(4):1035-1042.LI Mingjie,YU Zhao,XU Tao,et al.Study of complex oscillation caused by renewable energy integration and its solution[J].Power System Technology,2017,41(4):1035-1042.
[15]关宏亮,赵海翔,刘燕华.风力发电机组对称短路特性分析[J].电力自动化设备,2008,28(1):61-64.GUAN Hongliang,ZHAO Haixiang,LIU Yanhua.Symmetrical short circuit analysis of wind turbine generator[J].Electric Power Automation Equipment,2008,28(1):61-64.
[16]TRIPATHY P,SRIVASTAVA S C,SINGH S N.A modified TLS-ESPRIT based method for low-frequency mode identification in power systems utilizing synchrophasor measurements[J].IEEETransactions on Power Systems,2011,26(2):719-727.
[17]蒋平,吴熙,罗曦.基于TLS-ESPRIT算法的附加励磁阻尼控制抑制次同步振荡[J].电力自动化设备,2009,29(10):25-29.JIANG Ping,WU Xi,LUO Xi.SSO mitigation using supplementary excitation damping controller based on TLS-ESPRIT[J].Electric Power Automation Equipment,2009,29(10):25-29.
[18]贺静波,李立浧,陈辉祥,等.基于广域信息的电力系统阻尼控制器反馈信号选择[J].电力系统自动化,2007,31(9):6-10.HE Jingbo,LI Licheng,CHEN Huixiang,et al.Selection of feedback signal for power system damping controller based on wide area measurements[J].Automation of Electric Power Systems,2007,31(9):6-10.
[19]彭乔,刘天琪,李保宏,等.基于误差最小化射影控制的降阶高压直流鲁棒控制器[J].电网技术,2016,40(3):704-711.PENG Qiao,LIU Tianqi,LI Baohong,et al.Low order HVDC robust controller based on projective control with minimum error[J].Power System Technology,2016,40(3):704-711.
[2]BJORKLIND H,JOHANSSON K E,LISS G.Damping of subsynchronous oscillations in systems containing turbine and HVDC links[J].IEEE Transactions on Power Systems,2007,22(1):314-323.
[3]江全元,程时杰,曹一家.基于遗传算法的HVDC附加次同步阻尼控制器的设计[J].中国电机工程学报,2002,22(11):87-91.JIANG Quanyuan,CHENG Shijie,CAO Yijia.Design of HVDC subsynchronous damping controller using genetic algorithms[J].Proceedings of the CSEE,2002,22(11):87-91.
[4]顾威,李兴源,王渝红,等.基于改进粒子群算法的次同步阻尼控制器设计[J].电网技术,2010,34(8):52-56.GU Wei,LI Xingyuan,WANG Yuhong,et al.Design of subsynchronous damping controller based on improved particle swarm optimization algorithm[J].Power System Technology,2010,34(8):52-56.
[5]伍凌云,李兴源,龚勋.基于模糊免疫方法的次同步阻尼控制器设计[J].电力系统自动化,2007,31(11):12-16.WU Lingyun,LI Xingyuan,GONG Xun.Design of subsynchronous damping controller based on fuzzy immune method[J].Automation of Electric Power Systems,2007,31(11):12-16.
[6]付旺保,赵栋利,潘磊,等.基于自抗扰控制器的变速恒频风力发电并网控制[J].中国电机工程学报,2006,26(3):13-18.FU Wangbao,ZHAO Dongli,PAN Lei,et al.Cutting-in control of the VSCF wind-power generator based on auto-disturbance rejection controller[J].Proceedings of the CSEE,2006,26(3):13-18.
[7]刘炜,王朝亮,赵成勇,等.基于自抗扰控制原理的MMC-HVDC控制策略[J].电力自动化设备,2015,35(9):87-93.LIU Wei,WANG Chaoliang,ZHAO Chengyong,et al.ADRC-based controller for MMC-HVDC[J].Electric Power Automation Equipment,2015,35(9):87-93.
[8]马燕峰,周一辰,刘海航,等.一种基于自抗扰控制的多机低频振荡本地控制方法[J].中国电机工程学报,2017,37(5):1360-1373.MA Yanfeng,ZHOU Yichen,LIU Haihang,et al.A local control method of multi-machine low frequency oscillation based on active disturbance rejection control[J].Proceedings of the CSEE,2017,37(5):1360-1373.
[9]韩京清.自抗扰控制技术一估计补偿不确定因素的控制技术[M].北京:国防工业出版社,2013:255-261.
[10]郭一峰,徐赵东,涂青,等.基于遗传算法的LQR算法中权矩阵的优化分析[J].振动与冲击,2010,29(11):217-220.GUO Yifeng,XU Zhaodong,TU Qing,et al.Optimization analysis of weight matrix in the LQR algorithm based on genetic algorithm[J].Vibration and Shock,2010,29(11):217-220.
[11]康忠健,王清伟,黄磊,等.基于改进遗传算法的自抗扰控制器参数优化[J].信息与控制,2008,37(5):588-593.KANG Zhongjian,WANG Qingwei,HUANG Lei,et al.Parameter optimization of active disturbance rejection controller based on improved genetic algorithm[J].Information and Control,2008,37(5):588-593.
[12]赵磊,刘天琪,李兴源.基于变结构控制理论的高压直流附加频率控制器设计[J].电力自动化设备,2017,37(11):218-223.ZHAO Lei,LIU Tianqi,LI Xingyuan.Design of HVDC additional frequency controller based on variable structure control theory[J].Electric Power Automation Equipment,2017,37(11):218-223.
[13]赵睿,李兴源,刘天琪,等.抑制次同步和低频振荡的多通道直流附加阻尼控制器设计[J].电力自动化设备,2014,34(3):89-93.ZHAO Rui,LI Xingyuan,LIU Tianqi,et al.Design of multi-channel DC supplementary damping controller for subsynchronous and lowfrequency oscillation suppression[J].Electric Power Automation Equipment,2014,34(3):89-93.
[14]李明节,于钊,许涛,等.新能源并网系统引发的复杂振荡问题及其对策研究[J].电网技术,2017,41(4):1035-1042.LI Mingjie,YU Zhao,XU Tao,et al.Study of complex oscillation caused by renewable energy integration and its solution[J].Power System Technology,2017,41(4):1035-1042.
[15]关宏亮,赵海翔,刘燕华.风力发电机组对称短路特性分析[J].电力自动化设备,2008,28(1):61-64.GUAN Hongliang,ZHAO Haixiang,LIU Yanhua.Symmetrical short circuit analysis of wind turbine generator[J].Electric Power Automation Equipment,2008,28(1):61-64.
[16]TRIPATHY P,SRIVASTAVA S C,SINGH S N.A modified TLS-ESPRIT based method for low-frequency mode identification in power systems utilizing synchrophasor measurements[J].IEEETransactions on Power Systems,2011,26(2):719-727.
[17]蒋平,吴熙,罗曦.基于TLS-ESPRIT算法的附加励磁阻尼控制抑制次同步振荡[J].电力自动化设备,2009,29(10):25-29.JIANG Ping,WU Xi,LUO Xi.SSO mitigation using supplementary excitation damping controller based on TLS-ESPRIT[J].Electric Power Automation Equipment,2009,29(10):25-29.
[18]贺静波,李立浧,陈辉祥,等.基于广域信息的电力系统阻尼控制器反馈信号选择[J].电力系统自动化,2007,31(9):6-10.HE Jingbo,LI Licheng,CHEN Huixiang,et al.Selection of feedback signal for power system damping controller based on wide area measurements[J].Automation of Electric Power Systems,2007,31(9):6-10.
[19]彭乔,刘天琪,李保宏,等.基于误差最小化射影控制的降阶高压直流鲁棒控制器[J].电网技术,2016,40(3):704-711.PENG Qiao,LIU Tianqi,LI Baohong,et al.Low order HVDC robust controller based on projective control with minimum error[J].Power System Technology,2016,40(3):704-711.