As the fastest growing renewable energy power generation technology, has broad application prospects. However, wind energy is a randomly changing energy source, and changes in wind speed will cause fluctuations in the output power of wind turbines, which will affect the power quality of the grid.
At present, the active power fluctuation of wind power mostly adopts the method of directly adjusting the operating state of the wind turbine to smooth its output power, but the power adjustment ability of this method is limited; the reactive power fluctuation usually adopts the parallel static reactive power compensation device for reactive power adjustment, but there is no The power compensation device cannot smooth the fluctuation of active power. With additional energy storage equipment, it is possible to adjust reactive power, stabilize the bus voltage of the wind farm, and adjust active power in a wide range. Wind power research shows that the fluctuating power between 0.01Hz-1Hz has the greatest impact on the power quality of the power grid, and the suppression of wind power fluctuations in this frequency band has the greatest impact on the power quality of the power grid. The suppression of wind power fluctuations in this frequency band can be achieved by using a shorter period of energy storage. Therefore, the small-capacity energy storage device that can realize short-term energy storage has high application value for wind power generation. Supercapacitors can adapt to the large current fluctuations of wind energy because they have more than tens of thousands of charging and discharging cycle life and high current charging and discharging characteristics. It can absorb energy under the conditions of sufficient sunlight or strong wind during the day, and it is more powerful at night or wind power. Discharge at weak time, so as to smooth the fluctuation of wind power and realize more effective grid connection.
