基于预测虚拟转矩控制的DFIG并网逆变方法
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摘要
针对双馈风力发电机组(DFIG)高性能并网控制问题,提出一种DFIG并网逆变系统预测虚拟转矩控制方法。虚拟转矩的概念衍生于直接转矩控制中的电磁转矩,是由DFIG的转子磁链和电网虚拟磁链合成产生的。在建立DFIG并网逆变系统数学模型的基础上,分析了不同扇区中电压矢量对系统虚拟转矩、转子磁链的影响趋势,选取一个包含两个有效电压矢量和一个零电压矢量的三矢量序列,并给出功率无差拍跟踪时的矢量作用时间求取方法。最后,基于55 kW双馈风力发电实验样机对所提预测虚拟转矩方法进行性能验证。实验结果表明,该方法可实现DFIG系统平滑、无冲击并网,保证了并网接入点的动、稳态电能品质。
To solve the high performance control grid-connected control problem of doubly fed induction generator(DFIG), we propose a predictive virtual torque control method for distributed DFIG grid connected inverter system. Virtual torque is derived from the concept of direct torque control in motor driven system. It is synthesized from the rotor flux of DFIG and the virtual flux of grid. On the basis of establishing the mathematical model of the DFIG grid-connected inverter system. The effects of voltage vectors in different sectors on virtual torque and rotor flux are analyzed. Sequence of three vectors containing two effective voltage vectors and a zero voltage vector are selected, and it also give a method to calculate the vector action time to make the power tracking. Finally, the performance of the proposed method is verified based on the 55 kW DFIG experimental prototype. The experimental results show that this method can achieve the DFIG system smooth and shock free grid-connection, and guarantee the dynamic and steady power quality of the grid-connection point.
To solve the high performance control grid-connected control problem of doubly fed induction generator(DFIG), we propose a predictive virtual torque control method for distributed DFIG grid connected inverter system. Virtual torque is derived from the concept of direct torque control in motor driven system. It is synthesized from the rotor flux of DFIG and the virtual flux of grid. On the basis of establishing the mathematical model of the DFIG grid-connected inverter system. The effects of voltage vectors in different sectors on virtual torque and rotor flux are analyzed. Sequence of three vectors containing two effective voltage vectors and a zero voltage vector are selected, and it also give a method to calculate the vector action time to make the power tracking. Finally, the performance of the proposed method is verified based on the 55 kW DFIG experimental prototype. The experimental results show that this method can achieve the DFIG system smooth and shock free grid-connection, and guarantee the dynamic and steady power quality of the grid-connection point.
引文
[1]吴霜,季聪,孙国强.含分布式储能的配电网多目标运行优化策略研究[J].电力工程技术,2018,37(02):20-26.WU Shuang,JI Cong,SUN Guoqiang.Multiple objection operation strategy optimization research of distribution network including distributed energy storage[J].Electric power Engineering Technology,2018,37(02):20-26.
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[11]GUO W,XIAO L,DAI S.Enhancing low-voltage ride-through capability and smoothing output power of DFIG with a superconducting fault-current limiter-magnetic energy storage system[J].IEEE Transactions on Energy Conversion,2012,27(2):277-295.
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[15]IAZNLO A,GHOLAMIAN S A,KAZEMI M V.Using of fourswitch three-phase converter in the structure DPC of DFIG under unbalanced grid voltage condition[J].Electrical Engineering,2017(3):1-14.
[16]赵梅花,阮毅,宋文祥,等.DFIG的SVM-IPC与SVM-DPC比较[J].电机与控制学报,2014,18(9):68-73.ZHAO Meihua,RUAN Yi,SONG Wenxiang,et al.Comparison of indirect power control and direct power control for doubly-fed induction generator[J].Electric Machines and Control,2014,18(9):68-73.
[17]KOU P,LIANG D,Li J,et al.Finite-control-set model predictive control for DFIG wind turbines[J].IEEE Transactions on Automation Science&Engineering,2017,32(99):1-10.
[18]LI Xiaoming,ZHANG X,LIN Z,et al.Adaptive multiple MPC for a wind farm with DFIG[J].Journal of Electrical Engineering&Technology,2016,11(5):1116-1127.
[2]金楚,黎嘉明,徐沈智,等.大规模光伏发电并网概率潮流计算及对电网的影响[J].电力工程技术,2017,36(01):1-8.JIN Chu,LIJiaming,XU Shenzhi,et al.Probabilistic load flow calculation and influence analysis for power grid connected with large scale photovoltaic generation system[J].Electric power Engineering Technology,2017,36(01):1-8.
[3]丁明,王伟胜,王秀丽,等.大规模光伏发电对电力系统影响综述[J].中国电机工程学报,2014,34(1):2-14.DING Ming,WANG Weisheng,WANG Xiuli,et al.A review on the effect of large-scale PV generation on power systems[J].Proceedings of the CSEE,2014,34(1):2-14.
[4]赵伟然,汪海蛟,李光辉,等.分布式光伏并网电压和功率因数协调控制策略[J].电力工程技术,2017,36(6):20-26.ZHAO Weiran,WANG Haijiao,LI Guanghui,et al.Voltage and power factor coordination control for distributed photovoltaic integration[J].Electric Power Engineering Technology,2017,36(6):20-26.
[5]BAO X,ZHUO F,TIAN Y,et al.Simplified feedback linearization control of three-phase photovoltaic inverter with an LCLfilter[J].IEEE Transactions on Power Electronics,2013,28(6):2739-2752.
[6]吴子双,于继来,彭喜云.高风速段次优功率追踪方式的风电调频方法[J].电工技术学报,2013,28(5):112-119.WU Zishuang,YU Jilai,PENG Xiyun.DFIG's frequency regulation method only for high wind speed with suboptimal power tracking[J].Transaction of China Electro Technical Society,2013,28(5):112-119.
[7]刘璇,李琦,乐波,等.DFIG风场并网柔直系统的启动策略研究[J].电力电子技术,2016(11):39-41.LIU Xuan,LI Qi,YUE Bo,et al.Starting-up control of HVDCsystem for integrating DFIG-based wind farm[J].Power Electronics,2016(11):39-41.
[8]荣飞,朱斌,黄守道,等.基于前馈补偿的双馈风力发电控制系统[J].电力电子技术,2015,49(9):34-36.RONG Fei,ZHU Bin,HUANG Shoudao,et al.DFIG wind generation control system based on feedforward compensation[J].Power Electronics,2015,49(9):34-36.
[9]李涛涛,贾嵘,尹浩霖,等.风力发电机组状态监测系统设计与应用[J].电网与清洁能源,2016,32(1):95-99.LI Taotao,JIA Rong,YIN Haolin,et al.Design and application of condition monitoring system for wind turbine generator unit[J].Power System and Clean Energy,2016,49(9):34-36.
[10]朱玲,王建锋,时维俊.基于变流器网侧电流的双馈风力发电机转子绕组故障诊断[J].江苏电机工程,2016,35(3):76-79,83.ZHU Ling,WANG Jianfeng,SHI Weijun.Double-fed induction generator rotor fault diagnosis based on grid-side current of back-to-back converter[J].Jiangsu Electrical Engineering,2016,35(3):76-79,83.
[11]GUO W,XIAO L,DAI S.Enhancing low-voltage ride-through capability and smoothing output power of DFIG with a superconducting fault-current limiter-magnetic energy storage system[J].IEEE Transactions on Energy Conversion,2012,27(2):277-295.
[13]ANANTH D V N,KUMAR G V N.Fault ride-through enhancement using an enhanced field oriented control technique for converters of grid connected DFIG and STATCOM for different types of faults[J].Isa Transactions,2016,62:2-18.
[14]王向东,李湘宸,黄利刚.基于定子电压定向矢量控制系统的改进研究[J].自动化技术与应用,2015,34(11):19-24.WANG Xiangdong,LI Xiangchen,HUANG Ligang.Research on the improvement of stator voltage oriented vector control system[J].Industry Control and Applications,2015,34(11):19-24.
[15]IAZNLO A,GHOLAMIAN S A,KAZEMI M V.Using of fourswitch three-phase converter in the structure DPC of DFIG under unbalanced grid voltage condition[J].Electrical Engineering,2017(3):1-14.
[16]赵梅花,阮毅,宋文祥,等.DFIG的SVM-IPC与SVM-DPC比较[J].电机与控制学报,2014,18(9):68-73.ZHAO Meihua,RUAN Yi,SONG Wenxiang,et al.Comparison of indirect power control and direct power control for doubly-fed induction generator[J].Electric Machines and Control,2014,18(9):68-73.
[17]KOU P,LIANG D,Li J,et al.Finite-control-set model predictive control for DFIG wind turbines[J].IEEE Transactions on Automation Science&Engineering,2017,32(99):1-10.
[18]LI Xiaoming,ZHANG X,LIN Z,et al.Adaptive multiple MPC for a wind farm with DFIG[J].Journal of Electrical Engineering&Technology,2016,11(5):1116-1127.