【作者】 孙颖；

【导师】 颜湘武；

【作者基本信息】 华北电力大学 ， 电力系统及其自动化， 2021， 硕士

【摘要】 环境污染和能源危机推动了风力发电迅速发展,风力发电在电力系统中占比提高带来了对电力系统稳定性的挑战。风功率和负荷功率的波动,对系统频率的稳定控制提出了新要求。本文旨在关注双馈风力发电机组参与系统调频的方法研究,主要内容如下:首先,对双馈风力发电机组参与系统调频的研究背景和意义进行了介绍,对双馈风力发电机组进行建模,介绍了现有风力发电机组参与系统一次调频的方法原理,为进一步探讨双馈风力发电机参与系统调频研究打好了基础。其次,不同风电场面对不同风速,机组具有的惯量不同,目前普遍采用的虚拟惯量控制只简单的对其使用统一系数,对风速过高或过低的机组后期转速恢复不利。本文针对不同转速下的机组采用不同的系数进行虚拟惯量优化控制,并在频率恢复阶段修改控制参数极性,对频率恢复过程进行优化。针对目前采用超速或桨距角控制等牺牲平时发电量来为风机预留备用功率的情况,本文采用超级电容器作为双馈风机参与系统调频的备用,平时风力发电机组运行在最大功率跟踪下,保证其发电效益。最后,传统的双馈风力发电机转子侧闭环控制中采用PI控制器,该控制结构简单、使用广泛,但是面对风电这一扰动频繁的运行环境,其参数鲁棒性和抗扰性较差。本文采用线性自抗扰控制器,对转子侧功率环进行优化控制,使得功率能够快速、平滑地跟踪功率参考值,进而提高风电机组参与系统调频的效果,提高系统的抗扰动性。更多还原

【Abstract】 Environmental pollution and energy crisis promote the rapid development of wind power generation.The increasing proportion of wind power generation in the power system brings challenges to the stability of the power system.The fluctuation of wind power and load power puts forward new requirements for the stable control of system frequency.The purpose of this paper is to focus on the method of doubly fed wind turbine participating in system frequency regulationFirstly,the research background and significance of doubly fed wind turbine participating in system frequency regulation are introduced,the modeling of doubly fed wind turbine is carried out,and the methods and principles of existing wind turbine participating in system primary frequency regulation are introduced,which lays a good foundation for further research on doubly fed wind turbine participating in system frequency regulation.Secondly,different wind farms face different wind speeds and different inertia of units.At present,the traditional virtual inertia control only uses a uni fied coefficient for them,which is not conducive to the later speed recovery of units with too high or too low wind speed.In this paper,different coefficients are used to optimize the virtual inertia control for different speed units,and the polarity o f control parameters is modified in the frequency recovery stage to optimize the frequency recovery process.In view of the current situation of using overspeed or pitch angle control to reserve reserve reserve power for the wind turbine at the expense of normal power generation,this paper uses super capacitor as the reserve of doubly fed fan participating in system frequency regulation,and the normal operation of wind turbine is under maximum power tracking to ensure its power generation efficiency.Finally,PI controller is used in the traditional rotor side closed-loop control of doubly fed wind turbine.The control structure is simple and widely used.However,in the face of frequent disturbances of wind power,its parameter robustness and disturbance rejection are poor.In this paper,linear active disturbance rejection controller is used to optimize the rotor side power loop,so that the power can track the power reference value quickly and smoothly,so as to improve the effect of wind turbine participating in system frequency regulation and improve the anti disturbance performance of the system.更多还原