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A 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 the problems of not being able to effectively smooth the output power of wind turbines, and it is difficult to determine the size of T, and achieve the effects of accurate tracking, smooth output power, and reduced smoothing costs

Active Publication Date: 2022-07-22
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

Method used

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  • A fan power smoothing method based on DC bus voltage
  • A fan power smoothing method based on DC bus voltage
  • A fan power smoothing method based on DC bus voltage

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Embodiment Construction

[0032] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.

[0033] The fan power smoothing method based on the DC bus voltage provided in this application can be applied to such as figure 1 Shown in the context of a permanent magnet direct drive wind power system. 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 energy P that ...

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Abstract

The present application relates to a fan power smoothing method based on the DC bus voltage. The method includes: obtaining a smooth variation range of the DC bus voltage; based on the smooth variation range of the DC bus voltage, performing analysis according to a calculation formula for the maximum value of the time constant τ to obtain the maximum allowable value of the time constant τ; method, based on the maximum allowable value of the time constant τ, analyze according to the calculation formula of the DC bus voltage reference value, and determine the DC bus voltage reference value; control the DC bus voltage according to the DC bus voltage reference value to realize a smooth fan system The output power can accurately track the smoothing amount and respond quickly to control when the fan is started, which can effectively smooth the output power of the fan and improve the accuracy of the smoothing power.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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