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Gray wolf optimization algorithm based frequency modulation PID control method of doubly-fed induction wind-powered generation unit

A wind turbine and optimization algorithm technology, applied in wind power generation, electrical components, circuit devices, etc., can solve the problems of high control cost, long tracking time, and restrictions on the development of wind power generation, and achieve the effect of improving control accuracy and speeding up control speed

Inactive Publication Date: 2018-09-14
KUNMING UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

However, the current maximum power tracking control for double-fed induction motors has the characteristics of high control cost, long tracking time, and low tracking accuracy, which greatly limits the development of wind power generation, so it is necessary to improve it

Method used

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  • Gray wolf optimization algorithm based frequency modulation PID control method of doubly-fed induction wind-powered generation unit
  • Gray wolf optimization algorithm based frequency modulation PID control method of doubly-fed induction wind-powered generation unit
  • Gray wolf optimization algorithm based frequency modulation PID control method of doubly-fed induction wind-powered generation unit

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Example 1: The response of the system when the wind speed is continuously stepped from 8m / s to 12m / s, and the wind speed is increased by 1m / s for each step change to simulate a sudden change in wind speed. from image 3 It can be clearly found that compared with before optimization, the gray wolf algorithm can provide the largest power factor and achieve the largest wind energy capture. When adjusting the active power, the gray wolf algorithm obtains the minimum active power, which can adjust the active power more smoothly and quickly.

Embodiment 2

[0035] Example 2: The response of the system when the wind speed varies randomly between 8m / s and 12m / s. The wind speed is unpredictable, so the random wind speed change is used to study the control performance of the pack of gray wolves algorithm. The wind speed is within the rated working range, starting from 10m / s, changing randomly, and finally returning to 10m / s. The system responds as Figure 4 shown. It can be clearly found that the pack of gray wolves algorithm can obtain the power coefficient with the smallest oscillation. In the case that the active power adjustment is still oscillating when the optimization is not used, an almost smoothed curve appears. It is proved that when the algorithm of gray wolves is used, it is not easy to disturb the adjustment of the system due to the random mutation of wind force.

Embodiment 3

[0036] Embodiment 3: The rated voltage of the simulated power grid is dropped by 30% due to a sudden ground short circuit of the line and lasted for 625ms. The response of the system is as follows Figure 5 shown. The results show that the gray wolf algorithm has smaller power coefficient fluctuations than before optimization, and can still maintain a relatively minimum active power. Therefore, the gray wolf algorithm can quickly and effectively repair the system interference caused by the grid voltage drop, and enhance the stability of the power system.

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Abstract

The invention relates to a gray wolf optimization algorithm based frequency modulation PID control method of a doubly-fed induction wind-powered generation unit, and belongs to the technical field ofpower system control. The method comprises the following steps: performing PID control on parameters of a current converter at the power grid side of the doubly-fed induction wind-powered generation unit in an offline state; comparing the reference rotor speed of a generator and the reactive powder with the actual values; inputting the difference into the PID control to obtain corresponding reference current; comparing the obtained reference current with the actual current; inputting the difference into the PID control to obtain rotor voltage; optimizing the PID control link through the gray wolf algorithm; outputting the obtained voltage to the outside of the controller by adding compensation quantity; performing frequency modulation on the wind-powered generation unit through the outputvoltage; recycling the frequency modulation of the wind-powered generator in order to realize continuous tracking of the maximum power point. With the adoption of the method, the problem of local optimization of the maximum power point tracking target function in the frequency modulation process of the doubly-fed induction wind-powered generation unit can be solved.

Description

technical field [0001] The invention relates to a frequency modulation PID control method of a doubly-fed induction wind turbine based on a pack of gray wolves optimization algorithm, and belongs to the technical field of electric power system control. Background technique [0002] With the approaching of environmental protection society and energy crisis, wind power system, as a kind of green energy, plays an important role in the power system. Due to the influence of continuous random changes in wind speed, wind power generation equipment often has deviations in power and frequency when its output power is connected to the grid system. Once this deviation intensifies, it is easy to damage the internal frequency regulation capability of the grid and affect system stability. . The maximum power tracking control of wind power generation is to make the wind turbine maximize the use of wind energy so that it can continuously obtain the maximum power. However, the current maxi...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/386H02J3/24H02J2203/20Y02E10/76
Inventor 束洪春滕伟业杨博
Owner KUNMING UNIV OF SCI & TECH
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