飞轮储能风力发电系统的功率快速平滑控制策略研究

Research on Fast Power Smoothing Control Strategy for Wind Power Generation System with Flywheel Energy Storage

摘要:

飞轮储能风力发电系统可充分利用风能资源，抑制风电系统功率波动。但是飞轮储能系统的并网逆变器输出功率的高频扰动将降低电网吸纳风能的能力。且增加飞轮储能系统后，风力发电系统的软硬件成本较高。文中通过分析并网逆变器输出功率的高频扰动风量，计算飞轮储能系统功率参考值，实现快速功率平滑控制，减少并网功率波动，增加电网吸纳能力。通过采用定频滞环控制策略，克服了开关频率不固定、输出电流谐波含量高的缺点，其响应速度快，软硬件资源要求低，可减少PI控制器，减少锁相环等环节，降低软件开发成本。为验证采用定频滞环控制的快速功率平滑控制策略的性能，设计了仿真模型，并进行实验验证。仿真和实验结果表明：该控制策略可快速降低网侧有功功率波动，减小网侧电流谐波且软硬件成本低。

Abstract:

The wind power generation system with flywheel energy storage can make full use of wind energy resources and restrain the power fluctuation of wind power system. By analyzing the high-frequency disturbance air volume of output power of grid-side inverter, the power reference value of flywheel energy storage system can be calculated to realize fast power smoothing control, reduce the fluctuation of grid-connected power, and increase the absorption capacity of power grid. The hysteresis control strategy has fast response speed and low requirements of software and hardware, and the fixed-frequency hysteresis control strategy overcomes the shortcomings of unstable switching frequency and high harmonic content of output current. The use of fixed-frequency hysteresis control in the grid-connected inverter side can reduce the number of PI controllers, phase-locked loops and other links, and also reduce the software development cost of the control system. In order to verify the performances of the fast power smoothing control strategy using fixed-frequency hysteresis control, a simulation model is designed and verified by the experiments. The simulation and experimental results show that the proposed control strategy can quickly reduce the fluctuation of active power and the current harmonics in the grid side, and the cost of software and hardware is low.