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Microcomputer automatic quasi-synchronization paralleling realization method

A technology of automatic quasi-synchronization and realization method, applied in the field of electrical engineering, which can solve problems such as measurement error

Inactive Publication Date: 2011-08-31
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Even so, because the two voltage frequencies are not completely equal before they are paralleled, there is still a certain error in the measurement

Method used

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  • Microcomputer automatic quasi-synchronization paralleling realization method
  • Microcomputer automatic quasi-synchronization paralleling realization method
  • Microcomputer automatic quasi-synchronization paralleling realization method

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The following are the implementation steps of synchronous generator and grid bus connection.

[0041] (1) Set T S =800Hz, m=3, N=48, and the initial value of k is 0, and the generator voltage on both sides of the parallel circuit breaker and the grid bus voltage are continuously sampled, and the obtained sequence of generator and system side voltage sampling values ​​is set Respectively {u G (n)} and {u X (n)}.

[0042] (2) Calculate {u according to the formula 1 The short-time Fourier transform of (n)}:

[0043] U ( 3 , k ) = Σ n = 0 47 u 1 ( n + k ) w ( n ) e - j 3 ...

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Abstract

The invention discloses a microcomputer automatic quasi-synchronization paralleling realization method. The method comprises following steps: step1) taking sample to obtain the sampling sequences {uG(n)} and {uX(n)} of generator voltage uG(t) and system voltage uX(t); step2) carrying out the short time Fourier transform added with discrete rectangular self convolution window to on the sampling sequence, and realtimely detecting the generator voltage and frequency, amplitude and phase angle of the system voltage; step3) calculating the voltage frequency difference, amplitude difference and angular phase difference of the parallel two sides, and carrying out the synchronous condition detection and the synchronous points forecast. The microcomputer automatic quasi-synchronization paralleling realization method has no need for taking whole period sample to paralleling voltage signal and has advantages of simple realization and less calculated amount. The method, which can do accurate measurement of the amplitude, the frequency and the phase angle for voltage signal with frequency change in large scale, can improve the reliability, accuracy and rapidity of the quasi-synchronization paralleling operation and can reduce the impact from the paralleling operation to the electrical network and the electric power device, and the method also has engineering practical value.

Description

technical field [0001] The invention belongs to the technical field of electric engineering, and relates to a method for realizing automatic quasi-synchronous paralleling by a microcomputer. Background technique [0002] The automatic quasi-synchronization device is an automatic control device in the power system that performs parallel operation on the two parts of the generator and the power grid or power system. Its core task is to realize the rapid and accurate measurement of the frequency, amplitude and phase of the voltages of the two sides in parallel. , so that when the quasi-synchronous parallel condition is satisfied, a parallel closing signal with a constant lead time is issued. At present, there are mainly two methods to realize the automatic quasi-synchronization device: one uses hardware circuit to measure the voltage frequency and phase difference of the parallel two sides; the other uses the numerical method to calculate the frequency and phase difference of t...

Claims

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Application Information

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IPC IPC(8): H02J3/42
Inventor 黄纯江亚群何怡刚朱智军文超罗蛟
Owner HUNAN UNIV
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