基于反馈线性化的双馈风电机组次同步控制相互作用抑制策略
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摘要
大规模风电经固定串补线路送出时,由于变流器与固定串补之间的相互作用,使双馈风电机组(DFIG)可能会存在一种新的次同步谐振(SSR)问题,称为次同步控制相互作用(SSCI)。提出反馈线性化控制策略,并将之应用于DFIG转子侧变流器和网侧变流器控制回路以抑制SSCI。首先对系统的反馈线性化条件进行验证,再选取合适的坐标变换,在保证系统零动态稳定的前提下求得非线性状态反馈规律。在MATLAB/Simulink下的仿真结果表明:与参数已整定的比例-积分控制策略相比,反馈线性化控制策略能够有效抑制SSCI,使DFIG在不同串补度和风速下都能保持稳定运行,且不影响DFIG的故障穿越能力。
A nonlinear controller based on feedback linearization technique was proposed to mitigate sub-synchronous control interaction(SSCI) in series-compensated doubly fed induction generator(DFIG). The feedback linearization controller was developed for rotor side converter(RSC) and grid side converter(GSC) through four necessary steps, i.e., assessment of the feedback linearizability, coordinate transformation, feedback linearization, and derivation of control laws. A DFIG-based wind farm adapted from the IEEE first benchmark model was utilized to evaluate the performance of the designed controller at varied wind speeds and compensation levels, and the capability of the proposed controller in mitigating SSCI was compared to a well-tuned proportional-integral(PI) controller. The simulation results demonstrated the superior damping performance of the designed controller.
A nonlinear controller based on feedback linearization technique was proposed to mitigate sub-synchronous control interaction(SSCI) in series-compensated doubly fed induction generator(DFIG). The feedback linearization controller was developed for rotor side converter(RSC) and grid side converter(GSC) through four necessary steps, i.e., assessment of the feedback linearizability, coordinate transformation, feedback linearization, and derivation of control laws. A DFIG-based wind farm adapted from the IEEE first benchmark model was utilized to evaluate the performance of the designed controller at varied wind speeds and compensation levels, and the capability of the proposed controller in mitigating SSCI was compared to a well-tuned proportional-integral(PI) controller. The simulation results demonstrated the superior damping performance of the designed controller.
引文
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[2] 张剑,肖湘宁,高本锋,等.双馈风力发电机的次同步控制相互作用机理与特性分析[J].电工技术学报,2013,28(12): 142.
[3] ADAMS J, CARTER C, HUANG S H. ERCOT experience with sub-synchronous control interaction and proposed remediation[C]//Transmission and Distribution Conference and Exposition(T&D),IEEE PES,2012.
[4] FAN L L, MIAO Z X. Mitigating SSR using DFIG-based wind generation[J].IEEE Transactions on Sustainable Energy,2012,3(3): 349.
[5] HUANG P H, MOURSI M S E, XIAO W, et al. Subsynchronous resonance mitigation for series-compensated DFIG-based wind farm by using two-degree-of-freedom control strategy[J].IEEE Transactions on Power Systems,2015,30(3): 1442.
[6] MOKHTARI M, KHAZAEI J, NAZARPOUR D. Sub-synchronous resonance damping via doubly fed induction generator[J].International Journal of Electrical Power & Energy Systems,2013,53: 876.
[7] 卢强,梅生伟,孙元章.电力系统非线性控制[M].北京: 清华大学出版社,2008.
[8] MAHMUD M A, POTA H R, HOSSAIN M J. Dynamic stability of three-phase grid-connected photovoltaic system using zero dynamic design approach[J].IEEE Journal of Photovoltaics,2012,2(4): 564.
[9] MOHAMMADPOUR H A, SANTI E. Modeling and control of gate-controlled series capacitor interfaced with a DFIG-based wind farm[J].IEEE Transactions on Industrial Electronics,2015,62(2): 1022.
[10] LI P H, WANG J, XIONG L Y, et al. Nonlinear controllers based on exact feedback linearization for series-compensated DFIG-based wind parks to mitigate sub-synchronous control interaction[J].Energies,2017,10(8): 1182.
[11] 肖湘宁,郭春林,高本锋,等.电力系统次同步振荡及其抑制方法[M].北京: 机械工业出版社,2014.
[12] 梅生伟,申铁龙,刘康志.现代鲁棒控制理论与应用[M].北京: 清华大学出版社,2008.