Coordinated smooth control method for wind turbines and energy storage devices

Abstract

The invention relates to a coordinating and smoothing control method for a wind turbine generator and an energy storing device and belongs to the technical field of safe and economical operation and control of a grid-connected wind power field. The method comprises the following steps: calculating the low-pass filtering cut-off frequency of the wind turbine generator, performing low-pass filtering on the output power of the wind turbine generator, calculating the high-pass filtering cut-off frequency of the energy storing device, performing high-pass filtering on power instruct of the energy storing device by adopting the cut-off frequency, outputting active power for power compensation of the wind turbine generator, and restraining the high frequency part of the output power of the wind turbine generator by the active power. The method not only is free of relatively largely modifying on a control strategy of the wind turbine generator, convenient in practical application, relatively slight in influence on the wind turbine generator stability and the wind energy utilization rate and capable of simultaneously effectively reducing the capacity and cost of the energy storing device, prolonging the service life of the energy storing device, and has a relatively good economic benefit.

Description

technical field [0001] The invention belongs to the technical field of safe and economical operation and control of grid-connected wind farms, and in particular relates to a coordinated and smooth control method for wind turbines and energy storage devices. Background technique [0002] The volatility and randomness of wind power have a great impact on the safe and stable operation of the grid, increasing the difficulty of grid active power balance and scheduling, and becoming a bottleneck restricting the further development of wind power. [0003] At present, there are two main schemes for wind turbine power smoothing: optimized wind turbine control strategy and the use of external energy storage devices. [0004] The research on suppressing the fluctuation of wind power active power by optimizing the control strategy of wind turbines mainly focuses on the two aspects of torque control and pitch control of wind turbines. Torque control mainly uses the method of low-pass fi...

AI Technical Summary

Problems solved by technology

The biggest advantage of using external energy storage devices to smooth wind power active power is that it does not need to modify the control strategy of wind turbines, and it is an effective means to smooth wind power fluctuations. is an important factor that cannot be ignored

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