Method and system for measuring effective value of electric parameter of electric motor powered up by frequency converter

A measurement method and electric parameter technology, applied in effective value measurement, AC motor control, control system, etc., can solve the problem of low control precision of AC motor, failure of effective feedback by frequency conversion speed control system, non-sinusoidal periodic electric parameter The measurement method is not ideal enough to achieve the effect of convenient processing, low hardware requirements and high practicality

Active Publication Date: 2010-08-18
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: in the prior art, the measurement method of the effective value of the non-sinusoidal period electric parameter is not ideal enough, which leads to the failure of the frequency conversion speed regulation control system to obtain effective feedback, especially the control of the AC motor powered by the frequency converter low precision

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  • Method and system for measuring effective value of electric parameter of electric motor powered up by frequency converter
  • Method and system for measuring effective value of electric parameter of electric motor powered up by frequency converter
  • Method and system for measuring effective value of electric parameter of electric motor powered up by frequency converter

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Embodiment Construction

[0024] see figure 1 , the present invention firstly proposes a method for measuring the effective value of the electrical parameters of a motor powered by a frequency converter. The method includes an initialization stage and a dynamic tracking stage, wherein the initialization stage includes the following steps:

[0025] (a) Obtain the period T of the electrical parameter, determine the number of sampling N times according to the period T, and establish an array {p (0) 2 ,p (1) 2 ,p (2) 2 ,...p (N) 2 , P’} for data storage;

[0026] (b) Sampling the electrical parameter N times in one cycle, the interval time of each sampling is T / N, square the sampling value and store it in sequence: p (1) 2 ,p (2) 2 ,...p (N) 2 ;

[0027] (c) Using the formula Calculate the effective value P of the electric parameter in the period T;

[0028] Among them, the dynamic tracking phase includes the following steps:

[0029] (d) Read the new electrical parameter sampling value p...

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Abstract

The invention relates to a measuring method for an effective value of an electric parameter of an electric motor powered up by a frequency converter and a frequency control system. The method comprises the following steps of: (a) obtaining a period T of the electric parameter, determining the sampling frequency N according to the period T, and establishing an array {p(0)2, p(1)2, p(2)2, to p(N)2, p'} for data storage; (b) sampling the electric parameter N times in one period T, and sequentially storing the square of the sampling value to p(1)2, p(2)2, to p(N)2; and (c) utilizing a formula to compute the effective value P of the electric parameter in the period T. By adopting the method, the effective value of a non-sinusoidal periodic electric signal can be precisely obtained in real time, the computational method is simple, the treatment of an arithmetic unit is convenient and fast, the requirements for hardware are low, and the practical degree is high.

Description

technical field [0001] The invention relates to the technical field of signal processing and control, in particular to a method for measuring the effective value of electric parameters of a motor powered by a frequency converter and a frequency conversion speed regulation control system using the measurement method. Background technique [0002] Traditionally, the design and operation of AC motors are aimed at power frequency voltage (or current) close to sine waves, and the design of measuring instruments for the effective value of electrical parameters (such as voltage and current) is also mainly aimed at sinusoidal alternating currents. There are two types of instruments of the magnetoelectric system and the magnetoelectric system, and the effective value is obtained through the average value or peak-to-peak conversion. [0003] With the development of speed regulation and energy saving, servo control and production technology, more and more AC motors are powered by inver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/02H02P27/04
Inventor 王爱元
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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