Low-frequency oscillation identification method and suppression method of generator excitation system

A technology of excitation system and low frequency oscillation, which is applied in the direction of motor generator testing, measurement of electricity, and measurement of electrical variables, etc., can solve the problems of accuracy distortion, the processing speed of the embedded microcomputer system cannot meet the requirements, and the amount of calculation is extremely large. effect of time reduction

Active Publication Date: 2020-03-24
GUANGZHOU QINGTIAN INDAL
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  • Application Information

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Problems solved by technology

[0018] One of the technical problems to be solved by the present invention is to provide a low-frequency oscillation identification method for the generator excitation system to solve the serious distortion of the accuracy of identifying the low-frequency oscillation mode of the generator excitation system by the Prony method in the prior art, and because of The processing speed of the existing embedded microcomputer system cannot meet the actual needs of the project due to the huge amount of calculation

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  • Low-frequency oscillation identification method and suppression method of generator excitation system
  • Low-frequency oscillation identification method and suppression method of generator excitation system
  • Low-frequency oscillation identification method and suppression method of generator excitation system

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Embodiment 1

[0085] Such as figure 1 As shown, the present invention discloses a method for identifying low-frequency oscillations of a generator excitation system, including:

[0086]Step 1. Sampling the actual active power value of the generator excitation system at a fixed time interval Δt, and obtaining the actual active power collected at N sampling times before the current sampling time when low-frequency oscillation identification of the generator excitation system is required. value, and recorded as y in chronological order 0 ,y 1 ,...,y N-1 , and with y n Represents the actual value of active power at the n+1th said sampling moment, where N is a preset value, and the value of N can be set according to the actual needs of the project. The larger the value of N, the more accurate the results obtained in this application, But it will also increase the amount of calculation; the Nth sampling moment is the current sampling moment;

[0087] Step 2, the actual active power value y o...

Embodiment 2

[0125] Such as figure 1 As shown, the present invention also discloses a method for suppressing low-frequency oscillation of the generator excitation system, including:

[0126] Step 12. Calculate the DC component ds and the attenuation factor d with the order m according to the low-frequency oscillation identification method of the generator excitation system described in the first embodiment i , phase θ i , Oscillation frequency f i , Oscillation amplitude A i , i=1, 2,..., m, and, accordingly, the following active power prediction equation is constructed:

[0127]

[0128] In the formula, Indicates the predicted value of active power at the n+1th sampling moment;

[0129] Step 13, calculate the predicted active power value according to the following formula and the actual value of active power y n The signal-to-noise ratio SNR, if satisfy SNR>40dB, then consider that described active power prediction equation is effective, otherwise, repeat described step 12;

[...

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Abstract

The invention discloses a low-frequency oscillation identification method and suppression method of a generator excitation system. The method comprises the following steps: an AC component pre-estimation function is established and converted into a normal equation set, and SVD decomposition is carried out on a coefficient matrix to obtain k singular values; then, the Frobenious norms of k singularvalues are solved; an effective data order m of the active power of the lower generator excitation system is determined to solve an estimation function coefficient of the AC component estimation function according to the effective data order m; parameters b1, b2,..., bm are calculated, an attenuation factor di, a phase theta i, an oscillation frequency fi and an oscillation amplitude Ai with theorder of m are calculated by using the parameters according to the Prony method, so that the low-frequency oscillation mode of the generator excitation system at the current sampling moment and in N previous sampling moments can be identified. Moreover, the method can achieve the advanced intervention of the output quantity of the PSS model, and achieves the inhibition of the low-frequency oscillation of the generator excitation system in an advanced control mode.

Description

technical field [0001] The invention relates to a low-frequency oscillation identification method and suppression method of a generator excitation system. Background technique [0002] Low-frequency oscillation is an unstable state in the power system. If the system is not adjusted in time, it will easily cause the oscillation to diverge continuously, which will affect the stability of the entire power system, causing large-scale instability, solution, large-scale blackout, etc. Serious consequences. [0003] At present, the static excitation system of large-capacity generator sets uses the PSS (Power System Stabilizer) function to suppress low-frequency oscillations. By adding feedback quantities such as angular velocity and electric power, they are superimposed on the control output of the generator excitation system to achieve the effect of suppressing low-frequency oscillations. . This is a hysteresis feedback adjustment method, that is, it occurs first and then inhibi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34G06F17/16
CPCG01R31/343G06F17/16Y02E60/00
Inventor 张明棽李海燕徐小方
Owner GUANGZHOU QINGTIAN INDAL
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