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Phase sequence rapid measuring method based on instantaneous point

A measurement method, a technology of phase sequence detection, which is applied in the direction of phase sequence/synchronous indication, etc.

Active Publication Date: 2013-02-06
NANJING UNIV OF SCI & TECH
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  • Description
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  • Phase sequence rapid measuring method based on instantaneous point
  • Phase sequence rapid measuring method based on instantaneous point
  • Phase sequence rapid measuring method based on instantaneous point

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Embodiment Construction

[0028] In conjunction with the accompanying drawings, a fast phase sequence measurement method based on instantaneous points includes the following steps:

[0029] Step 1. Install a voltage sensor or a current sensor on each phase of the three-phase system to monitor the voltage or current of the three phases;

[0030] Step 2. Take the zero-crossing point of any phase voltage or current of the three-phase system as a reference point, sample the other two-phase instantaneous values ​​at the zero-crossing point and store the above-mentioned instantaneous values; wherein, the connected three-phase circuits are respectively x, y, z, and their instantaneous values ​​of voltage or current at a certain moment are expressed as: u x , u y , u z or i x i y i z , the zero-crossing point refers to positive zero-crossing or negative zero-crossing;

[0031] Step 3. Judging the phase sequence of the three-phase system according to the magnitude of the detected instantaneous value, if x...

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Abstract

The invention discloses a phase sequence rapid measuring method based on a three-phase instantaneous point. According to the phase sequence rapid measuring method, an existing hardware basis of a system is utilized, a circuit is not additionally arranged, an instantaneous value relation of a three-phase system is utilized, and the phase sequence relation of the three-phase system can be rapidly judged by using a simple logical judgement relation according to a three-phase component instantaneous value relation of an optional ZCP (Zero Crossing Point) time in the three-phase system. Compared with the traditional independent phase sequence measuring method, the phase sequence rapid measuring method disclosed by the invention has the advantages that the calculation is simple, the judgement is rapid, a hardware circuit for independently measuring the phase sequence is not added, the response time is not higher than 1 / 6 work period, and the phase sequence rapid measuring method is very effective for a three-phase symmetrical system or an application occasion similar to the three-phase symmetrical system.

Description

technical field [0001] The invention belongs to the technical field of power system measurement, in particular to a fast phase sequence measurement method based on instantaneous points. Background technique [0002] In a three-phase AC system, phase sequence is a very important parameter. If there is a phase sequence error, it will cause measurement failure, reverse rotation of the three-phase motor, and burning of components in the inverter circuit. Therefore, there are many different phase sequence detection methods. In the traditional phase sequence measurement, one is to use a separate phase sequence detection circuit, which requires an external phase sequence detection capacitor; the other is to use the phase characteristics of the three-phase system, but the calculation is cumbersome and the response speed is slow. Considering that the current three-phase system, whether it is a motor control or an inverter circuit, has a three-phase voltage and current detection syst...

Claims

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Application Information

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IPC IPC(8): G01R29/18
Inventor 吕广强李强程洪德
Owner NANJING UNIV OF SCI & TECH
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