Method for improving utilization rate of wind power by using hybrid energy storage

Abstract

A method for improving the utilization rate of wind power by using hybrid energy storage. The method combines a battery pack, a flywheel energy storage, a supercapacitor, and a pumped storage power station into a hybrid energy storage device, which is divided into a DC part and an AC part to be applied to a wind farm, and uses an energy management system to formulate strategies to control the charging-discharging of the hybrid energy storage device and improve the utilization rate of wind power. The battery pack, the flywheel energy storage, and the supercapacitor form the DC part. The pumpedstorage power station forms the AC part. The energy-type and power-type energy storage devices are combined to further improve the overall performance of the energy storage device. Wind-driven generation power fluctuation is non-linear and is coverted according to the Hilbert frequency to calculate the low-frequency, intermediate-frequency and high-frequency fluctuations, which correspond to the power distribution among the battery pack, the flywheel energy storage, and the super capacitor of the DC part so as to stablize the real-time output fluctuation of the wind farm and improve power quality. When the wind power has a large fluctuation rate, the storage capacity of the pumped storage power station with a large capacity is used for peak shaving, which directly improves the utilizationrate of wind power. The hybrid energy storage device can effectively suppress the wind power fluctuation, achieves peak shaving, and finally achieve the purpose of improving the utilization rate of wind power.

Description

technical field [0001] The invention belongs to the technical field of wind power generation and control, and relates to a method for improving the utilization rate of wind power by using a hybrid energy storage device. Background technique [0002] With the continuous application of new energy power generation technology, the proportion of new energy and distributed power generation in the power grid is getting higher and higher. Wind power is a renewable clean energy. my country has a vast territory, large land area and long coastline. It has abundant wind power resources and huge potential for wind energy development. At present, my country has become the largest and fastest growing wind power market in the world. [0003] Due to the fluctuation and intermittence of wind energy, the output power of the wind farm and the predicted power have nonlinear and unstable deviations. The incorporation of large-scale wind power into the power grid has adverse effects on the relia...

AI Technical Summary

Problems solved by technology

The incorporation of large-scale wind power into the power grid has adverse effects on the reliability and continuity of power supply, leading to a series of problems such as a decrease in the safety and stability of the power system, which brings great difficulties to power grid dispatching and limits the development of wind power generation.

At present, with the increasing scale of wind power generation, the difficulty of wind power grid connection and the phenomenon of wind abandonment are intensifying, improving the shortcomings of large output power fluctuations and uneven output power of wind power generation, and improving the utilization rate of wind power are problems that need to be solved urgently

[0004] At this stage, there are three main methods to solve the low utilization rate of wind power: the first is to allow wind power to participate in economic dispatch at the macro level to improve the capacity of wind power consumption, but it does not fundamentally solve the problem of wind power volatility and does not meet the objective objective of large-scale wind power in my country. The second is to optimize the wind power generation model and wind power forecasting algorithm, correct the wind power dispatching curve according to the error distribution law, and reduce the difference between the actual output of wind power generation and the dispatching curve

This method can reduce the fluctuation of wind power generation output, but the intermittence of wind energy cannot be completely predicted by historical data, and the error cannot be completely eliminated; Fast charging and discharging to smooth out fluctuations in wind power output

However, a single energy storage device has the disadvantages of slow charging and discharging, small energy storage capacity, or short service life, and the focus of solving the problem is to stabilize small fluctuations, not to cut peaks and fill valleys, and to improve wind power utilization more effectively.

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