Method for smoothing output power of wind power station by utilizing energy storage system

Abstract

The invention discloses a method for smoothing output power of a wind power station by utilizing an energy storage system. In the method, not only wind power is introduced to predict or rectify the output power of the wind power station, but an improved self-adaptive filtering algorithm is applied. Since the output power of the wind power station is rectified by predicting the wind power, the change rate of the output power of the wind power station is decreased, and the output power of the wind power station can meet standards to inject into a power grid. By employing the self-adaptive filtering algorithm, regarding to the input power in different time, time weight coefficient in an adaptive filtering structure can be automatically calculated according to the input, so that the defect that different input cannot correspond to different filtering time constant by utilizing a low pass filter smoothing method in the past can be overcome. After the smoothing method is employed to smooth the output power of the wind power station, the output voltage of the wind power station is kept stable, fluctuation and flicker of the power grid voltage is reduced, harmonic pollution is reduced and accidents are reduced.

Description

technical field

[0001] The invention belongs to the technical field of wind power generation control, and more specifically relates to a method for smoothing the output power of a wind farm by using an energy storage system. Background technique

[0002] As a renewable and clean energy, wind power has attracted more and more attention. However, the output power of the wind farm is affected by the wind speed. The randomness and uncontrollability of the wind speed cause the output power to rise or fall instantaneously. The output power of the field is smoothed to reduce the change of output power and ensure the stability and safety of the power grid.

[0003] With the continuous increase of wind power installed capacity, the grid has to face the double test of grid voltage fluctuation caused by large-scale wind power penetration and the need to continuously improve the grid operation level, and energy storage technology is one of the effective ways to solve this dilemma. [...

Examples

Embodiment

[0045] figure 2 It is a structural diagram of a specific embodiment of a method for smoothing the output power of a wind farm by utilizing an energy storage system in the present invention.

[0046] Such as figure 2 As shown, in this embodiment, the structure implementing the method of the present invention includes a power prediction module, a power correction module, an adaptive filtering module, an adaptive algorithm module, and a desired signal limiting module, wherein the adaptive filtering module, The adaptive algorithm module and the expected signal limiting module constitute an adaptive filter.

[0047] The power prediction prediction module is used to correct the wind farm output power P wf (k) and make up for its delay in the acquisition time; through the adaptive algorithm module, adapt to the power input value, and realize power smoothing; the expected signal limiting module combines the requirements of the national grid for the output change rate of the wind f...

example

[0073] The method of the present invention for smoothing the output power of a wind farm using an energy storage system is applied to a specific application, and the data collected by a certain wind farm is used for testing. The input signal is the wind farm output power value P wf , corrected by the prediction module, and finally the final output power is obtained by the adaptive filter.

[0074] This example uses the data of a certain wind farm with an installed capacity of 25MW; it is used to correct the original data (ΔP peak +ΔP) takes a value of 2MW. According to the "Technical Regulations for Connecting Wind Farms to Power Systems", the output power change rate of wind farms is stipulated. For the installed capacity of wind farms E 总 Less than 30MW, the maximum change in 1min is 6MW; installed capacity E 总 30-150MW, 1min change is installed capacity E 总 / 5, Δm=6MW is taken in this example. The order of the adaptive filter is selected as N=10, and the data of this sp...

technical field

[0001] The invention belongs to the technical field of wind power generation control, and more specifically relates to a method for smoothing the output power of a wind farm by using an energy storage system. Background technique

[0002] As a renewable and clean energy, wind power has attracted more and more attention. However, the output power of the wind farm is affected by the wind speed. The randomness and uncontrollability of the wind speed cause the output power to rise or fall instantaneously. The output power of the field is smoothed to reduce the change of output power and ensure the stability and safety of the power grid.

[0003] With the continuous increase of wind power installed capacity, the grid has to face the double test of grid voltage fluctuation caused by large-scale wind power penetration and the need to continuously improve the grid operation level, and energy storage technology is one of the effective ways to solve this dilemma. [...

Examples

Embodiment

[0045] figure 2 It is a structural diagram of a specific embodiment of a method for smoothing the output power of a wind farm by utilizing an energy storage system in the present invention.

[0046] Such as figure 2 As shown, in this embodiment, the structure implementing the method of the present invention includes a power prediction module, a power correction module, an adaptive filtering module, an adaptive algorithm module, and a desired signal limiting module, wherein the adaptive filtering module, The adaptive algorithm module and the expected signal limiting module constitute an adaptive filter.

[0047] The power prediction prediction module is used to correct the wind farm output power P wf (k) and make up for its delay in the acquisition time; through the adaptive algorithm module, adapt to the power input value, and realize power smoothing; the expected signal limiting module combines the requirements of the national grid for the output change rate of the wind f...

example

[0073] The method of the present invention for smoothing the output power of a wind farm using an energy storage system is applied to a specific application, and the data collected by a certain wind farm is used for testing. The input signal is the wind farm output power value P wf , corrected by the prediction module, and finally the final output power is obtained by the adaptive filter.

[0074] This example uses the data of a certain wind farm with an installed capacity of 25MW; it is used to correct the original data (ΔP peak +ΔP) takes a value of 2MW. According to the "Technical Regulations for Connecting Wind Farms to Power Systems", the output power change rate of wind farms is stipulated. For the installed capacity of wind farms E 总 Less than 30MW, the maximum change in 1min is 6MW; installed capacity E 总 30-150MW, 1min change is installed capacity E 总 / 5, Δm=6MW is taken in this example. The order of the adaptive filter is selected as N=10, and the data of this sp...

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