Phasor amplitude measurement method of power system

A power system and measurement method technology, applied in the field of power system phasor amplitude measurement, can solve problems such as large frequency deviation error, achieve the effect of satisfying error requirements and solving calculation accuracy

Active Publication Date: 2009-10-21
NARI TECH CO LTD
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Problems solved by technology

The author of literature [1] proposed a simplified amplitude correction method, but the error is larger when the frequency deviation is slightly larger

Method used

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  • Phasor amplitude measurement method of power system
  • Phasor amplitude measurement method of power system
  • Phasor amplitude measurement method of power system

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Embodiment Construction

[0024] Given that the original signal is x(t)=4096·cos(2·π·f·t), and N is 24, the fixed sampling pulse interval is t s = T 0 N = 1 f 0 · N = 1 50 × 24 , f takes different values, every t s Sampling once at intervals, a total of 96 points are sampled, and the obtained sampling point sequence is x f (0), x f (1),...,x f (95).

[0025] Since most of the CPUs used in frequency and voltage emergency control devices at this stage are shaping CPUs, it is to simulate the actual computing environment: when obtaining the original sampling point signal, the calculation result of cos(2·π·f·t) is a decimal, and then multiplied by 4096 and then rounded ...

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Abstract

The invention discloses a phasor amplitude measurement method of a power system. The method comprises the following steps: the low-pass filtration is firstly carried out on an original sinusoidal input signal, namely a voltage simulation quantity signal by a low-pass filter module; the original sinusoidal input signal respectively enters a hardware zero-crossing detection frequency module for measuring the frequency f of the signal and a hardware fixed time interval discrete sampling module for measuring the amplitude Fm and the initial phase angle phi after the filtration treatment by the low-pass filter module; and the signal respectively enters a module for calculating the offset Delta lambda of the frequency and an amplitude gain GAIN module at the current frequency after obtaining the frequency f. When the phasor frequencies which access to the same A/D multi-channel power system are inconsistent, the method can obtain the offset Delta lambda of the frequency by greatly reducing or even having no need of complicated calculation, thereby not only being easy to realize on a frequency voltage emergency control device of the power system, but also meeting the error requirements on a project and solving the contradiction between calculating the cost and the precision.

Description

technical field [0001] The invention belongs to the technical field of electric power systems and automation thereof, and more precisely relates to a method for measuring phasor amplitudes in electric power systems. Background technique [0002] The magnitude of the phasor in the power system is an important observation quantity, and the frequency and voltage emergency control device of the power system should measure its value in real time, and make corresponding control measures according to its value change. The commonly used amplitude calculation methods for power system frequency and voltage emergency control devices are root mean square method and Fourier transform algorithm. However, both the root mean square method and the Fourier transform algorithm require the sampling interval t s It satisfies the relationship with the number of sampling points per cycle N and the period T t s = T N ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25
Inventor 任建锋孙玉军徐军袁康朱传宏
Owner NARI TECH CO LTD
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