【摘要】 以改善风电场接入的电力系统稳定性并降低稳定控制对场内机组负面影响为目标,设计基于变速风电机组的电力系统综合稳定控制器。控制器基于广域信息,应用同步机状态反馈,通过风电场衰减系统故障不平衡能量以提高同步机主系统暂态稳定性;考虑风电场与同步机关联程度的差异,简化的部分同步机状态反馈方案可有效降低控制器的通信负担。在测量风速偏差的前提下,稳定控制器通过扩张状态观测前馈线性化H∞鲁棒变桨方案,抑制稳定控制引发的风电机组轴系扭矩波动。控制器分散控制,服务全局,无需风场控制中心协调。仿真研究表明,控制器可有效减小同步机主系统过渡时间与振幅,增加系统故障临界切除时间,并显著降低轴系扭矩波动对风电机组的不利影响。更多还原

【Abstract】 This paper presents a novel integrated stability controller for wind farm equipped with variable speed wind generators.The controller regards the power system stability improvement and reduction of negative effect of stability control on the wind generator reduction as objectives.According to the synchronous machine state feedback strategy,the controller,which would dissipate the system transient energy,can improve the synchronous machines transient stability basing on the wide area information.With the different correlation between wind farm and synchronous machines,the non-full synchronous machine state feedback strategy can greatly relieve the control system communication burden.According to the feed forward linearization H$ robust pitch regulation using extended state observer,the controller alleviates the extra mechanical loading on the drive train.The controller contributes to the system stability by distributed control without wind farm center coordination.The simulation results show that,with the controller,power system with wind farms has less settling time,oscillatory peak value and more critical clear time,and the torque fluctuation on the wind generator drive train is significantly reduced.更多还原