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Power control system and method of wind turbine generator

A technology for wind turbines and power control, applied in wind power generation, current collectors, electric vehicles, etc., can solve the problems of wind speed fluctuations, combustion products polluting the environment, and fan working instability, etc., to improve stability and reduce operation. Effects of costs and losses

Active Publication Date: 2020-12-11
NANJING VOCATIONAL UNIV OF IND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As a non-polluting renewable energy, wind energy has been valued and protected at home and abroad. The biggest difference between wind power and thermal power is the combustion of thermal power It will pollute the environment, and wind power generation is inexhaustible with the help of natural wind. However, with the development of wind power generation technology, the wind speed has severe fluctuations, which leads to the instability of fan work. , it is impossible to reduce the impact of wind speed on the power system and the effective time period of wind speed, and it is impossible to know the specific voltage value when the super capacitor is charged and discharged, and the remaining power in the energy storage capacitor can supply the user with a specific range of power, so people urgently need A wind turbine power control system and method to solve the above problems

Method used

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  • Power control system and method of wind turbine generator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Embodiment 1: In step S1, wavelet decomposition and DE-SVM are used to predict the power according to the wind speed, and the sequence of the original wind speed is F={13,10,8,5,10}, The wind speed sequence decomposed by wavelet is D 1 = 0.1, 0.5, 0.4, 0.4, 0.5, D 2 =0.4,09,0.7,0.7,0.9, the wind speed sequence of the approximate sequence is A={12,9,7,8,10}, and choose the Db2 wavelet base to decompose and reconstruct the experimental data in two layers, and merge Normalize the original wind speed sequence F to train the SVM and get the normalized sample x' i , and normalize the sample x′ i Denormalize to get the real value x i , so as to obtain the output power P of the fan, and the rated wind speed is 1500KW;

[0072] According to the formula:

[0073]

[0074] x' 2 =0.625,x' 3 =0.375,x' 4 =0,x' 5 =0.625;

[0075] x 1 =x' 1 (13-5)+5=13;

[0076] x 2 =10;x 3 =8,x 4 =5,x 5 = 10;

[0077]

[0078] P 2 =1166KW; P3 =833kW; P 4 =333kW;P 5 =833kW; ...

Embodiment 2

[0081] Example 2: In step S2, the set of wind turbines generating electricity for users is ={Z, H, Q}, the electricity supplied to users by wind turbines in the first month is Z=600w, and the electricity supplied to users in the second month is H=580w, it is known that the electricity supplied to users in the third month is 450w, and the electricity supplied to users in the fourth month is 540w

[0082] According to the formula:

[0083]

[0084] | e 4 |=543-540=3w;

[0085]

[0086] | e 3 |=590-450=140w

[0087] According to the calculation results, it can be seen that the forecast of the fourth month is more accurate.

Embodiment 3

[0088] Embodiment 3: The energy storage capacitor of the existing wind turbine is charged and discharged, the charging time is 5 minutes, the discharging time is 2 minutes, and the voltage value in the charging process is V t , the voltage value during discharge is V o , the initial voltage of the capacitor is 180v, the known equivalent resistance is 500Ω, and the capacitance value is 3F;

[0089] According to the formula:

[0090]

[0091]

[0092] According to the calculation results, it can be obtained; V o >V t , the capacitor needs to be charged.

[0093] in: is a moving average of period 1, Z t-i is the observed value of period t-1 (t=1,2,3...N),|e t | is the absolute value of the deviation.

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Abstract

The invention belongs to the technical field of wind power generation, and particularly discloses a power control system and method of a wind turbine generator, and the system comprises a wind power prediction module, a power control module, and a data detection module. The wind power prediction module is used to predict the output power according to the wind speed of a wind farm, wherein the power control module is used for predicting the output quantity of power, and the data detection module is used for detecting the residual voltage of an energy storage capacitor in real time and controlling the usage amount of discharge voltage according to the residual voltage, the invention is scientific and reasonable, and is convenient and safe to use, the output power can be controlled by adjusting the wind speed of the wind power plant through the wind power prediction module to predict the output power corresponding to the wind speed within a certain time, and the actual output power of thepower can be distributed through the power control module. The data detection module is used for detecting the discharge voltage of the energy storage capacitor in the wind turbine generator in realtime, and a worker can know the electric quantity stored in the energy storage capacitor in the wind turbine generator in advance and can adjust the electric quantity in time.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a power control system and method for a wind turbine. Background technique [0002] As a non-polluting renewable energy, wind energy has been valued and protected at home and abroad. The biggest difference between wind power and thermal power is that the combustion of thermal power will pollute the environment, while wind power relies on the wind of nature. It can be said to be inexhaustible, but with the development of wind power generation technology, the wind speed has severe fluctuations, which leads to the instability of the fan work, and cannot reduce the impact of wind speed on the power system and the effective wind speed. During the time period, it is impossible to know the specific voltage value of the supercapacitor charging and discharging and the power of the specific range that the remaining power in the energy storage capacitor can supply to the user....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/46H02J3/28H02J3/00H02J7/00H02J7/34
CPCH02J3/466H02J3/381H02J3/28H02J3/004H02J7/345H02J7/0068H02J2300/28H02J2207/50H02J2203/10H02J2203/20Y02E10/76Y02E70/30Y02E10/72
Inventor 刘颖罗乔
Owner NANJING VOCATIONAL UNIV OF IND TECH