基于飞轮储能装置的风力发电系统输出功率柔性控制

Flexible Control of Output Power for Wind Power Generation System Using Flywheel Energy Storage

风力发电系统的输出功率和频率受风能的随机性、波动性和不确定性影响,使得大规模的风力发电系统不能直接并网,严重影响了风力发电事业的发展。针对此问题提出了采用飞轮储能装置对系统输出功率进行柔性控制的解决方案。通过双PWM变流器将发电系统与储能系统相连,并控制系统间能量双向流动,从而调节风力发电系统的输出功率。基于瞬时功率理论,对风力发电系统输出功率采用内、外环相结合的控制策略。网侧PWM变流器采用直流侧电压和无功功率的外环控制,储能侧PWM变流器则采用直接功率控制策略,双PWM变流器的内环控制均采用dq轴电流解耦控制。仿真结果验证了该方法的有效性。

The output power and frequency of wind power generation system have been greatly affected by randomness, volatility and uncertainties of wind, which makes large-scale wind power system not grid directly, and seriously influences the development of wind power. To solve the problem, a control strategy using flywheel energy storage device to control the output power of wind power generation system flexibly was provided. Using dual PWM converter as a link between the wind power system and energy storage system, the bidirectional flow of energy was realized, adjusting the output power of wind power generation system. Based on the instantaneous reactive power theory, the combination of inside loop and outside loop used for the control of wind power generator output power was introduced. The gird side PWM converter is used for the outside loop control of DC voltage and the reactive power, the energe storage side PWM converter is used for the control of the direct power control, the dq axis current decoupling control method is used for the dual PWM converters in the inside loop. The simulation results show the effectiveness of the method.