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Calculation method of sub-synchronous oscillation mode attenuation coefficients based on Prony algorithm

A technology of subsynchronous oscillation and attenuation coefficient, which is applied in the direction of calculation, reduction/prevention of power oscillation, electrical digital data processing, etc., and can solve problems such as error-prone, increased unit operation risk, and heavy workload

Inactive Publication Date: 2015-08-19
SHENHUA GUOHUA (BEIJING) ELECTRIC POWER RES INST +1
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AI Technical Summary

Problems solved by technology

Modal damping is related to many system parameters. The theoretical calculation requires a large number of parameters, and the system is modeled in detail. The workload is heavy and error-prone
The field test needs to stimulate the sub-synchronous oscillation of the system at each sub-synchronous frequency, which requires a large amount of engineering and increases the risk of unit operation

Method used

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  • Calculation method of sub-synchronous oscillation mode attenuation coefficients based on Prony algorithm
  • Calculation method of sub-synchronous oscillation mode attenuation coefficients based on Prony algorithm
  • Calculation method of sub-synchronous oscillation mode attenuation coefficients based on Prony algorithm

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Embodiment Construction

[0035] According to the present invention, as attached figure 1 As shown, the steps to calculate the modal attenuation coefficient of the generator shaft speed signal are as follows.

[0036] (1) Determining the analysis signal: For the transmission system using high-voltage direct current transmission or series compensation transmission, after a single-phase ground fault disturbance occurs on the grid side, take out the generator shaft speed signal x, x contains the data of N sampling moments, Respectively denoted as x(1), x(2), ..., x(g), ... x(N), the x signal sampling time interval is dt, then the time series t=gdt corresponding to the gth data in x, which is

[0037] (2) Determine the number of modes to be analyzed: suppose the number of modes to be analyzed is m, and the frequency of each mode is recorded as f(1), f(2), ... f(m);

[0038] (3) Use the analysis signal to construct a matrix and solve the least squares solution: Construct a matrix X, X is a matrix of (N-...

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Abstract

The invention relates to a calculation method of the sub-synchronous oscillation mode attenuation coefficients based on Prony algorithm, and mainly aims at solving the problem in extracting key modal parameters as modal frequency and attenuation coefficients from sub-synchronous signals. The calculation method is based on the Prony algorithm, takes shafting rotating speed signal of high sensitivity as input signals, employs least square fit, greatly eliminates influence of noise signals, requires no filtering, reserves all data information, is capable of extracting multiple modal information, and thus, extracts attenuation coefficients of different modes accurately and rapidly.

Description

technical field [0001] The invention relates to a method for calculating the attenuation coefficient of the subsynchronous oscillation mode of a steam turbine generating set, which is applied in the analysis and simulation of the subsynchronous oscillation of the power system. Specifically, it involves the calculation of the attenuation coefficient of the subsynchronous oscillation mode based on the Prony algorithm, which eliminates the influence of noise during the measurement process, avoids the influence of traditional filters, and retains all data information. Background technique [0002] In order to carry out long-distance and large-capacity power transmission, the application of HVDC power transmission and line series capacitance compensation is becoming more and more common, and the problem of subsynchronous oscillation caused by it is also becoming more and more prominent. The power system subsynchronous oscillation is a kind of power oscillation lower than the powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24G06F17/50
CPCY02E60/00
Inventor 杨文超王顶辉范永胜张京锁张晋宇梁新艳郑巍常富杰赵伟华钱华东
Owner SHENHUA GUOHUA (BEIJING) ELECTRIC POWER RES INST
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