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New energy power generation oscillation suppression method and system

A new energy and oscillation component technology, applied in wind power generation, reducing/preventing power oscillation, electrical components, etc., can solve the problems of unfavorable new energy transmission and consumption, insufficient adaptability, large engineering volume, etc., and achieve grid connection Oscillating puzzles, versatile effects

Pending Publication Date: 2022-06-07
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Directly cutting off the new energy station will cut off the overall power of the station, which is not conducive to the transmission and consumption of new energy, and at the same time, may cause damage to the new energy unit
The method of off-line optimization of the control of new energy generator sets has insufficient adaptability when grid-connected conditions and operating conditions change, and the amount of work to deal with new oscillation problems is large

Method used

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  • New energy power generation oscillation suppression method and system
  • New energy power generation oscillation suppression method and system
  • New energy power generation oscillation suppression method and system

Examples

Experimental program
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Effect test

Embodiment 1

[0050] The present invention proposes a method for suppressing oscillation of new energy power generation, such as figure 2 shown, including:

[0051] S1. For the collected instantaneous voltage and current of the unit port, use online FFT analysis to determine the oscillation component of each frequency band;

[0052] S2. Perform oscillation identification on the oscillation components of each frequency band;

[0053] S3. On the basis of the oscillation identification result, online adjustment of the control parameters is started according to the oscillation frequency band and the trigger condition corresponding to the frequency band, so as to realize oscillation suppression.

[0054] Below, a new energy generation oscillation suppression method of the present invention is described in detail, and the process is as follows image 3 shown.

[0055] Step S1, using on-line FFT analysis to determine the oscillating components of each frequency band for the collected instantan...

Embodiment 2

[0065] Based on the same inventive concept, the present invention also provides a new energy power generation oscillation suppression system, including:

[0066] The acquisition module is used to determine the oscillation component of each frequency band by using online FFT analysis for the collected instantaneous voltage and current of the unit port;

[0067] The identification module is used to identify the oscillation components of each frequency band;

[0068] The suppression module is used for starting the online adjustment of the control parameters according to the oscillation frequency band and the trigger condition corresponding to the frequency band based on the oscillation identification result, so as to realize oscillation suppression.

[0069] Wherein, the identification module is specifically used for: sorting according to the amplitudes of the oscillating current components based on different frequency bands, and identifying the dominant oscillating components of...

Embodiment 3

[0073] A new energy power generation oscillation suppression method based on the present invention is built on a real-time simulation platform. Image 6 The simulation model of the system shown, the oscillation monitoring and suppression control module is implemented by C language programming, and the direct-drive wind turbine adopts the grid-connected inverter model.

[0074] The simulation results of oscillation suppression control are as follows: Figure 7 shown. At 5s, the active power of the wind turbine is increased, and the amplitude of the oscillating current reaches I m2,ssb , trigger the timer to reach the set time threshold T m,ssb When =1s, the control is triggered, and the control parameters are adjusted from the initial parameter group 1 to the parameter group 2. As the power continues to increase, the oscillation current threshold is reached again at 11.3s, the trigger is controlled at 12.3s, and adjusted to parameter group 3, the oscillation gradually decays...

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Abstract

The invention provides a new energy power generation oscillation suppression method and system, and the method comprises the steps: collecting the voltage and current instantaneous quantity of a unit port in real time, obtaining the oscillation components of different frequency bands such as sub / super synchronization, middle frequency band, high frequency band and the like through online FFT analysis, triggering an alarm signal through oscillation recognition and judgment, starting the online adjustment of control parameters, and achieving the suppression of new energy power generation oscillation. And multi-loop control parameters of a phase-locked loop, a current loop, a direct-current voltage loop and the like of the wind turbine generator are adjusted. According to the method, a control parameter online adjustment method for the oscillation frequency of each frequency band is considered, and adjustment and optimization of the control parameters and effective suppression of the broadband oscillation problem of the wind turbine generator in a weak power grid are realized in real time. Meanwhile, the method is suitable for different types of new energy power generation devices, has universality, and is beneficial to solving the problem of grid-connected oscillation of various types of actual new energy power generation devices.

Description

technical field [0001] The invention relates to the field of power generation oscillation suppression, in particular to a new energy power generation oscillation suppression method and system. Background technique [0002] In northern and northwestern China, most large-scale new energy power generation is developed in remote areas and connected to the main grid through long-distance transmission lines, and the grid strength of new energy access points is weak. The complex interaction between new energy generation control and weak grid can lead to instability and oscillation problems. For example, from 2015 to 2017, the sub- / super-synchronous oscillation problem frequently occurred in Xinjiang Hami Wind Power Base. figure 1 shown. The oscillation component in this wide frequency range is easy to interact with the torsional vibration of the shafting of the synchronous generator set, resulting in permanent damage to the shafting. [0003] In recent years, the above-mentioned...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/241H02J3/381H02J2300/20Y02E10/76
Inventor 汪海蛟张君何国庆田旭王伟胜张祥成刘纯刘联涛冯双磊刘飞李光辉孙艳霞王世斌马俊华许德操李积泰张仕钰梁国勇白左霞车琰瑛范瑞铭
Owner CHINA ELECTRIC POWER RES INST
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