Computing method of frequency characteristic coefficient of electric system
A technology of frequency characteristics and power systems, applied in the field of calculation of power system frequency characteristic coefficients, can solve problems such as different calculation results, and achieve the effect of reducing errors
Active Publication Date: 2014-01-01
WUHAN UNIV
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[0003] The present invention mainly solves the technical problem that the traditional frequency characteristic coefficient calculation method in the prior art only calculates the value in a certain mode, and cannot characterize the characteristic technical problem that the frequency characteristic coefficient of the system changes with the change of the operating condition; Aiming at the problem that the same system has different calculation results due to different frequency deviations in different working conditions, a calculation method for the frequency characteristic coefficient of the power system is provided. The frequency characteristic coefficient value calculated by this method can better reflect the actual power system. frequency characteristics
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[0028] A method for judging frequency characteristics of a grid system, characterized in that it comprises the following steps:
[0029] Step 1, through simulation calculation Corresponding frequency characteristic coefficient values under different schemes of inputting different hot standby units and removing different loads ,in, , is a positive integer; simulation calculation Frequency characteristic coefficient values corresponding to various load schemes The specific method is based on the following formula:
[0030]
[0031] and are the power deviation and frequency deviation in a certain operating mode, respectively. In the formula: , is the system frequency before the disturbance, is the system frequency after the disturbance; It is the sum of the increased power of all generators in the studied system during this process, and the increased power includes all the increased power of the secondary frequency modulation; is the sum of the c...
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The invention relates to the field of the electric system and automation, in particular to a computing method of frequency characteristic coefficient of the electric system. The computing method is characterized by including the following steps of firstly, computing i frequency characteristic coefficient values Ki input into different standby heat units and corresponding to schemes for eliminating different loads in a simulation manner, wherein the i=1,2...n is a positive integer; secondly, determining probability distribution function, namely P(fi), of a frequency value fi of the electric system; and thirdly, computing different frequency characteristic coefficients K in i schemes by weighted average algorithm. Accordingly, the computing method has the following advantages that the problem of different computing results in the same system caused by errors of frequencies used in computing is solved, and error between the frequency characteristic coefficient computed by the computing method and the actual frequency characteristic coefficient is reduced greatly.
Description
technical field [0001] The invention relates to the fields of power systems and automation, in particular to a calculation method for frequency characteristic coefficients of power systems. Background technique [0002] The static frequency characteristic of the power system refers to the relationship between active power and frequency when the system is in a stable state. It is a comprehensive result of the frequency characteristic, generator frequency characteristic and voltage influence, and is expressed by the static characteristic coefficient K. The traditional calculation method of static characteristic coefficient usually has two methods of survey statistics method and test method. The workload of the survey and statistics method is heavy, and the compliance is constantly changing, so it is difficult to accurately obtain the frequency characteristic coefficient; the test method is too much work, and the test will affect the normal and stable operation of the system. ...
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IPC IPC(8): H02J3/00
Inventor 邓长虹黄文涛
Owner WUHAN UNIV