10kWh飞轮储能变流器在风电场的应用研究

发布时间：2018-07-03 02:35

本文选题：功率平滑 + 飞轮储能　；参考：《沈阳工业大学》2017年硕士论文

【摘要】：风力发电具有间歇性、随机性和波动性,风电的大规模并网会严重威胁到电网的调度及电网的稳定性。为了提高风电场输出电能质量、抑制功率波动,减缓电网对风电的接纳限制,可采用储能装置抑制风电场输出功率波动。充分利用飞轮储能响应速度快、转换效率高、维护简单、使用寿命长、对环境无污染等优点。本文研究基于飞轮储能装置的风电场输出功率平滑控制策略,风电场10kWh飞轮储能装置变流器的控制策略是研究的重点。主要工作如下:(1)研究飞轮储能的技术特点、工作原理及其装置结构;飞轮储能装置选用永磁同步电机作为飞轮电机,采用矢量控制技术作为飞轮电机的控制方法,构建飞轮储能装置的数学模型。(2)针对飞轮储能控制中外界扰动过大、电机内部参数发生变化的问题,在飞轮储能装置电机侧变流器控制系统中,设计了基于滑模控制的飞轮电机电流调节器,用以替代PID控制器。滑模调节器以飞轮储能装置的参考功率和飞轮电机的实际转速作为输入、将积分项和时变项引入到常规滑模面、根据指数趋近律设计控制律,这些设计使该飞轮储能装置的控制系统具有更好地鲁棒性、更佳的抗扰能力和动态响应性能。(3)针对飞轮储能存在的容量小、功率较低的主要缺点,在储能系统中加入蓄电池装置,用以配合飞轮储能装置进行储能。提出了基于飞轮-蓄电池联合储能的风电功率平滑控制策略。采用低通滤波的方法来确定飞轮储能装置和蓄电池的功率分配参考值,并设计模糊控制器对蓄电池和飞轮储能装置的参考功率进行实时修正,更加充分的发挥飞轮储能响应速度快和循环使用寿命长特点。在Matlab/Simulink的仿真环境下搭建模型,仿真结果表明:本文所设计的基于滑模控制的飞轮电机电流调节器,具有更佳的动态响应能力和抗扰性,使飞轮电机的转速波动减小,同时使风电场功率平滑效果更好,证明了所设计方法的有效性。提出的基于飞轮-蓄电池联合储能的风电功率平滑控制策略既能够对频率高、且幅值小的功率波动起到平抑作用,又能够对频率低、但幅值大的功率波动起到平抑作用,使风电场输出的功率平滑效果有了大幅提升,证明了本文所提出的控制策略的正确性。
[Abstract]:Wind power generation is intermittent, random and fluctuating. The large-scale grid connection of wind power will seriously threaten the dispatching and stability of power grid. In order to improve the output power quality of wind farm, restrain the fluctuation of power and slow down the acceptance of wind power in power grid, the energy storage device can be used to restrain the fluctuation of output power of wind farm. The advantages of flywheel energy storage, such as fast response speed, high conversion efficiency, simple maintenance, long service life and no pollution to the environment, are fully utilized. In this paper, the output power smoothing control strategy of wind farm based on flywheel energy storage device is studied. The control strategy of wind farm 10kWh flywheel energy storage device converter is the focus of the research. The main work is as follows: (1) the technical characteristics, working principle and device structure of flywheel energy storage are studied, the permanent magnet synchronous motor (PMSM) is selected as flywheel motor, and vector control technology is used as flywheel motor control method. The mathematical model of flywheel energy storage device is built. (2) aiming at the problem that the external disturbance in flywheel energy storage control is too large and the internal parameters of motor change, in the control system of motor side converter of flywheel energy storage device, A flywheel motor current regulator based on sliding mode control is designed to replace pid controller. The sliding mode regulator takes the reference power of the flywheel energy storage device and the actual speed of the flywheel motor as input. The integral term and the time-varying term are introduced into the conventional sliding mode surface, and the control law is designed according to the exponential approach law. These designs make the control system of the flywheel energy storage device have better robustness, better immunity against disturbance and dynamic response performance. (3) the main disadvantages of the flywheel energy storage are small capacity and low power. Accumulator is added to energy storage system for energy storage with flywheel energy storage device. A smooth control strategy of wind power based on flywheel-battery combined energy storage is proposed. The method of low-pass filter is used to determine the power distribution reference value of flywheel energy storage device and battery, and a fuzzy controller is designed to modify the reference power of storage battery and flywheel energy storage device in real time. More fully display the flywheel energy storage response speed and long cycle life. The simulation results of Matlab / Simulink show that the current regulator based on sliding mode control has better dynamic response ability and immunity, and reduces the speed fluctuation of flywheel motor. At the same time, the wind farm power smoothing effect is better, which proves the effectiveness of the design method. The proposed wind power smoothing control strategy based on flywheel battery combined storage energy can not only stabilize the power fluctuation with high frequency and small amplitude, but also stabilize the power fluctuation with low frequency but large amplitude. The power smoothing effect of wind farm output is greatly improved, which proves the correctness of the control strategy proposed in this paper.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM614;TM46

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