CN109270399B - Mutual inductor wiring automatic matching system of electric energy quality control equipment - Google Patents
Mutual inductor wiring automatic matching system of electric energy quality control equipment Download PDFInfo
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- CN109270399B CN109270399B CN201810892453.8A CN201810892453A CN109270399B CN 109270399 B CN109270399 B CN 109270399B CN 201810892453 A CN201810892453 A CN 201810892453A CN 109270399 B CN109270399 B CN 109270399B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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Abstract
An automatic matching system for mutual inductor wiring of power quality management equipment. The automatic matching device comprises a mutual inductor configurator, a positive and negative sequence extraction module and an automatic matching module which are sequentially connected, wherein the input of the mutual inductor configurator is a sampling value of a wiring port current, the output of the mutual inductor configurator is connected with the positive and negative sequence extraction module, the positive and negative sequence extraction module is connected with the automatic matching module, and the automatic matching function is realized by adjusting the polarity and the phase sequence of three-phase power through the automatic matching module. The invention can lead the management equipment to work normally by automatically configuring correct polarity and phase sequence parameters when the wiring of the mutual inductor of the power quality management equipment has wiring errors under the condition of not modifying the physical line.
Description
Technical Field
The invention relates to the field of electronic power, in particular to an automatic matching method for wiring of a three-phase transformer of power quality control equipment.
Background
When the electric energy quality control equipment such as SVG, SPC and APF is installed on site, three-phase external lines of a transformer of the control equipment are required to be connected to a bus according to correct phase sequence and polarity, and an external transformer for measuring load current is also connected to the electric energy quality control equipment according to correct phase sequence and polarity. Because the secondary side of the mutual inductor can not be opened under the condition of load, the secondary side of the mutual inductor must be short-circuited firstly to correct wiring errors, and the operation is time-consuming and labor-consuming.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides an automatic matching system for the wiring of a mutual inductor of power quality management equipment.
The technical scheme adopted by the invention for solving the technical problems is as follows: the transformer wiring automatic matching system of the power quality management equipment comprises a transformer configurator, a positive and negative sequence extraction module and an automatic matching module, wherein the input of the transformer configurator is a sampling value of wiring port current, the output of the transformer configurator is connected with the positive and negative sequence extraction module, and the positive and negative sequence extraction module is connected with the automatic matching module; the transformer configurator comprises:
a polarity configuration module having a forward select port and a reverse select port;
the phase sequence configuration module is provided with three input channels, including an A-phase input channel, a B-phase input channel and a C-phase input channel;
the parameter module comprises a polarity parameter and a phase sequence parameter, the polarity parameter controls the port selection of the polarity configuration module, and the phase sequence parameter controls the input channel selection of the phase sequence configuration module;
the matching steps of the automatic matching module are as follows:
1) the electric energy meter measures a power factor and sets a preset phase angle phi;
2) eight combinations are obtained through the polarity arrangement of the mutual inductor configurator on the three-phase current, and zero-sequence currents of the eight polarity combinations are obtained;
3) selecting two groups of combinations with the minimum zero sequence current from eight polarity combinations, namely a forward combination and a reverse combination with consistent three-phase polarities;
4) respectively arranging the forward combination and the reverse combination with a three-phase sequence through the mutual inductor configurator to obtain twelve combinations;
5) acquiring positive and negative sequence amplitudes of twelve polarity combinations through the positive and negative sequence module;
6) selecting six positive sequence combinations from the twelve combinations according to the magnitudes of the positive sequence amplitudes and the negative sequence amplitudes;
7) and respectively calculating the phase angles theta of the six positive sequence combinations through the automatic matching module, comparing the phase angles theta with a preset phase angle phi, and obtaining a combination of the phase angles and the preset phase angle with a difference value smaller than 30 degrees as a combination of a correct polarity parameter and a correct phase sequence parameter.
The polarity parameter comprises a three-bit binary code, wherein the first bit of the binary code is used for selecting the input polarity of the phase A, the second bit is used for selecting the input polarity of the phase B, and the third bit is used for selecting the input polarity of the phase C.
The phase sequence parameters comprise three-bit hexadecimal codes, the first bit of the hexadecimal codes is selected for an A-phase output channel, the second bit is selected for a B-phase output channel, and the third bit is selected for a C-phase output channel.
The phase angle theta is calculated from the positive sequence of sample values.
The invention has the beneficial effects that: after the power quality management equipment is wired on the site of a user, if a wiring error occurs, the power quality management equipment can recognize the error state through the automatic matching system and automatically configure the correct polarity and phase sequence, so that the power quality management equipment can normally work without modifying a physical line again, and the installation operation of personnel on the equipment is simplified.
Drawings
FIG. 1 is an external block diagram of an auto-match according to an embodiment of the present invention.
Fig. 2 is a block diagram of a transformer configurator according to an embodiment of the present invention.
Fig. 3 is a flow chart of automatic matching according to an embodiment of the present invention.
Detailed Description
The embodiments of the invention will be further described with reference to the accompanying drawings in which:
the three-phase mutual inductor has six wiring, including polarity and phase sequence attribute, and in the application field of power quality control equipment, 8 kinds of polarity combinations and 6 kinds of phase sequence combinations exist in the possibility of wiring, synthesizes the error condition of polarity and phase sequence up to 48 kinds of conditions, and once the condition of wiring error occurs, the condition is very inconvenient to investigate. The invention can automatically match the ports of the three-phase mutual inductor with the wiring without checking and reconnecting the physical line under the condition of wiring error.
In the embodiment of the invention, the mutual inductor wiring automatic matching system of the electric energy quality management equipment comprises a mutual inductor configurator, a positive and negative sequence extraction module and an automatic matching module, wherein the mutual inductor configurator, the positive and negative sequence extraction module and the automatic matching module are sequentially connected end to end, the mutual inductor configurator inputs a three-phase current sampling value, and the automatic matching module outputs configurator parameters after correct matching is completed.
In the automatic matching module, phi is a preset voltage and current phase angle automatically matched by the mutual inductor, and Right Sequence and Right Polarity are correct configurator parameters output after the automatic matching is finished; in positive and negative order extraction modeIn block, IdP、IqP、IdN、IqN、IzThe positive sequence negative sequence DQ axis component and the zero sequence component of the three-phase current sampling value are respectively.
Under normal power grid load, the zero-sequence current is small or even zero, and the obvious characteristic that the three-phase current polarity of the mutual inductor is inconsistent is that the fed-back zero-sequence current is very large, and the polarity can be judged through the zero-sequence current.
The steps of the automatic matching method are as follows:
1) measuring a power factor by using an electric energy meter, and setting a preset phase angle phi;
2) the polarity combination arrangement of the three-phase current through the mutual inductor configurator is totally eight conditions,
the method comprises the following steps:
A-A’-B-B’-C-C’，A-A’-B-B’-C’-C，A-A’-B’-B-C-C’，
A-A’-B’-B-C’-C，A’-A-B-B’-C-C’，A’-A-B-B’-C’-C，
a ' -A-B ' -B-C-C ', A ' -A-B ' -B-C ' -C, wherein A ', B ' and C ' are negative electrodes, and the zero sequence currents of the eight polarity combinations are respectively measured;
3) selecting and storing two groups of combinations with the minimum zero sequence current from eight polarity combinations, wherein the two polarity combinations are a forward combination and a reverse combination with consistent three-phase polarities;
4) the phase sequence combination arrangement of three-phase current is realized through the mutual inductor configurator, the wiring of the configurator port is totally six conditions,
the method comprises the following steps:
ABC, ACB, BAC, BCA, CAB and CBA, and combining the forward combination and the reverse combination with six phase sequence combinations respectively to obtain a total of twelve groups of mutual inductor configuration combinations;
5) calculating the positive sequence amplitude and the negative sequence amplitude of twelve polarity combinations through the positive sequence module and the negative sequence module;
6) selecting six positive sequence combinations from the twelve combinations according to the magnitudes of the positive sequence amplitudes and the negative sequence amplitudes;
7) the voltage and current phase angles theta (theta) in the 6 combinations are respectively calculated by an automatic matching moduleFrom IdP,IqPCalculating) and comparing with the automatically matched preset phase angle phi; and selecting a combination of which the absolute value of the difference value between the phase angle theta and the preset phase angle phi is less than 30 degrees as a correct parameter combination.
The wiring matching process of the mutual inductor is completed through an automatic matching method, so that the output current has correct polarity and phase sequence.
The skilled person should understand that: although the invention has been described in terms of the above specific embodiments, the inventive concept is not limited thereto and any modification applying the inventive concept is intended to be included within the scope of the patent claims.
Claims (1)
1. The utility model provides an automatic matching system of mutual-inductor wiring of electric energy quality treatment equipment which characterized in that: the system comprises a mutual inductor configurator, a positive and negative sequence extraction module and an automatic matching module, wherein the input of the mutual inductor configurator is a sampling value of the current of a wiring port, the output of the mutual inductor configurator is connected with the positive and negative sequence extraction module, and the positive and negative sequence extraction module is connected with the automatic matching module; the transformer configurator comprises:
a polarity configuration module having a forward select port and a reverse select port;
the phase sequence configuration module is provided with three input channels, including an A-phase input channel, a B-phase input channel and a C-phase input channel;
the parameter configuration module comprises a polarity parameter and a phase sequence parameter, the polarity parameter controls the port selection of the polarity configuration module, and the phase sequence parameter controls the input channel selection of the phase sequence configuration module;
the matching steps of the automatic matching module are as follows:
1) the electric energy meter measures a power factor and sets a preset phase angle phi;
2) eight combinations are obtained through the polarity arrangement of the mutual inductor configurator on the three-phase current, and zero-sequence currents of the eight polarity combinations are obtained;
3) selecting two groups of combinations with the minimum zero sequence current from eight polarity combinations, namely a forward combination and a reverse combination with consistent three-phase polarities;
4) respectively arranging the forward combination and the reverse combination with a three-phase sequence through the mutual inductor configurator to obtain twelve combinations;
5) acquiring positive and negative sequence amplitudes of twelve polarity combinations through the positive and negative sequence extraction module;
6) selecting six positive sequence combinations from the twelve combinations according to the magnitudes of the positive sequence amplitudes and the negative sequence amplitudes;
7) respectively calculating phase angles theta of six positive sequence combinations through the automatic matching module, comparing the phase angles theta with a preset phase angle phi, and obtaining a combination of the phase angles and the preset phase angle with a difference value smaller than 30 degrees as a combination of a correct polarity parameter and a correct phase sequence parameter;
the polarity parameter comprises a three-bit binary code, wherein the first bit of the binary code is an A-phase input polarity selection, the second bit is a B-phase input polarity selection, and the third bit is a C-phase input polarity selection;
the phase sequence parameters comprise three-bit hexadecimal codes, the first bit of the hexadecimal codes is selected for an A-phase output channel, the second bit is selected for a B-phase output channel, and the third bit is selected for a C-phase output channel;
the phase angle θ is calculated from the positive sequence DQ axis component of the sampled value.
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| CN103513220B (en) * | 2013-09-24 | 2014-11-19 | 国家电网公司 | Method for judging false wiring of three-phase three-wire electric energy meter |
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| CN104502736B (en) * | 2015-01-09 | 2017-06-23 | 珠海派诺科技股份有限公司 | A kind of online phase sequence self-adaption method |
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Denomination of invention: Automatic Matching System for Transformer Wiring of Power Quality Control Equipment Effective date of registration: 20221102 Granted publication date: 20210504 Pledgee: Wenzhou Financing Guarantee Co.,Ltd. Pledgor: ZHEJIANG YIDEK TECHNOLOGY CO.,LTD. Registration number: Y2022110000291 |