Wind power plant power smoothing method for lowering power fluctuation frequency and interval maximum variation rate

A power fluctuation and power smoothing technology, which is applied in wind power generation, single-net parallel feeding arrangement, AC network load balancing, etc., to achieve the effect of prolonging battery life and reducing the variation amplitude

Inactive Publication Date: 2017-10-03
DONGHUA UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Predecessors have conducted a lot of research from the perspective of energy storage system smoothing wind power fluctuations, but there is still a lot of room for improvement in terms of the economy and smooth control effect of the configured energy storage system

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  • Wind power plant power smoothing method for lowering power fluctuation frequency and interval maximum variation rate
  • Wind power plant power smoothing method for lowering power fluctuation frequency and interval maximum variation rate
  • Wind power plant power smoothing method for lowering power fluctuation frequency and interval maximum variation rate

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Embodiment Construction

[0012] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0013] Such as figure 1 As shown, it is a structural diagram of a wind farm with an energy storage system: the energy storage system is generally connected to the grid-connected port of the wind farm or the output side of each fan, and the energy storage system is connected to the grid-connected port of the wind farm. The output power Pb smoothes the output power Pw of the wind farm, so that the grid-connected power Pg of the ...

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Abstract

The invention relates to a wind power plant power smoothing method for lowering power fluctuation frequency and an interval maximum variation rate. The method is characterized by comprising the following steps: decomposing a wind power plant power signal into a high-frequency component and a low-frequency component through a wavelet packet decomposition method; filtering out the high-frequency component; further filtering the low-frequency component through a low-pass filtering algorithm while reducing an output maximum fluctuation quantity in order to obtain expected grid-connection power; and subtracting the expected grid-connection power from the wind power plant power, and issuing a charging/discharging command to an energy storage system through a control system in order to obtain actual grid-connection power. A low-pass filtering algorithm smoothing control strategy fusing wavelet packets is provided on the basis of relevant indexes of the national wind power grid-connection standard, so that the inspection segment indexes of 1min and 10min in the grid-connection standard are met; the variation amplitude of a battery state of charge (SOC) is reduced at the same time; and the battery life is prolonged.

Description

technical field [0001] The invention relates to a wind farm power smoothing method for reducing power fluctuation frequency and interval maximum change rate, and belongs to the technical field of wind power control. Background technique [0002] With the vigorous development of wind power generation, the proportion of wind power generation in the entire power system in my country continues to increase, and the inherent volatility and intermittency of wind power will bring more and more impact on the power system. Therefore, the national standard for wind power grid connection has made clear regulations on output fluctuations, fault ride-through, and active and reactive power adjustment of wind farms. The assessment of the fluctuation of wind farm output is mainly based on the maximum variation within 1 minute and 10 minutes. In addition to improving the control of wind turbines and wind farms, smoothing wind power fluctuations using energy storage systems is also an importa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/32
CPCH02J3/32H02J3/38Y02E10/76
Inventor 李征陈佳瑜石坤
Owner DONGHUA UNIV
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