Fan power smoothing method based on DC bus voltage

A DC bus voltage and power smoothing technology, applied in the field of wind power, can solve problems such as difficulty in determining the size of T, inability to effectively smooth the output power of the wind turbine, etc., to achieve accurate tracking, smooth output power, and reduce smoothing costs.

Active Publication Date: 2021-09-17
HOHAI UNIV
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Problems solved by technology

However, the square ΔU of the voltage difference before and after the sampling period is ignored 2 Therefore, the effectiveness of DC bus voltage to achieve power smoothing depends on the value of T. However, due to the fast charging and discharging capabilities of the capacitor itself, it is difficult to determine the size of T. Therefore, the current DC bus voltage control cannot effectively smooth the fan output. power

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  • Fan power smoothing method based on DC bus voltage
  • Fan power smoothing method based on DC bus voltage
  • Fan power smoothing method based on DC bus voltage

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Embodiment Construction

[0032] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0033] The fan power smoothing method based on the DC bus voltage provided by this application can be applied to such as figure 1 The environment of the permanent magnet direct drive wind power generation system shown. Among them, the permanent magnet direct drive wind power generation system includes a fan 1, a permanent magnet synchronous generator (Permanent Magnet Synchronous Generator, PMSG) 2, a back-to-back converter 3, a DC side capacitor 4 and a power grid 5, and the permanent magnet synchronous generator 2 is directly connected to the fan 1. The mechanical energ...

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Abstract

The invention relates to a fan power smoothing method based on DC bus voltage. The method comprises the following steps: acquiring a smooth change range of DC bus voltage; based on the smooth change range of the direct-current bus voltage, performing analyzing according to a maximum value calculation formula of a time constant tau to obtain an allowable maximum value of the time constant tau; performing analyzing according to a direct current bus voltage reference value calculation formula based on the allowable maximum value of the time constant tau by adopting a time segmentation control mode, and determining a direct current bus voltage reference value; and controlling the direct current bus voltage according to the direct current bus voltage reference value, so the output power of the smoothing fan system is realized, the smoothing quantity can be accurately tracked, the response control can be quickly performed when the fan is started, the output power of the fan can be effectively smoothed, and the accuracy of the smoothing power is improved.

Description

technical field [0001] The present application relates to the technical field of wind power, and in particular to a wind power smoothing method based on DC bus voltage. Background technique [0002] Wind energy has become the most concerned and developed renewable energy due to its clean, pollution-free, and abundant storage characteristics. However, due to the random change of wind energy caused by the uncertainty of wind speed, the output power of wind turbines will also fluctuate, resulting in the decline of output power power quality, frequency deviation and voltage flicker in the power grid. In order to meet the requirements of grid-connected wind turbines and improve the quality of output power, how to smooth the output power of wind turbines has become an urgent problem to be solved. [0003] The methods of smoothing the output power of wind turbines can be divided into indirect power control and direct power control according to whether energy storage devices are in...

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Application Information

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IPC IPC(8): H02P9/00H02P21/00H02J1/14
CPCH02P9/00H02P21/00H02J1/14H02J2300/28
Inventor 朱瑛马钲洲
Owner HOHAI UNIV
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