CN107359800B - Multi-range current converter based on zero magnetic flux compensation and compensation method - Google Patents
Multi-range current converter based on zero magnetic flux compensation and compensation method Download PDFInfo
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- CN107359800B CN107359800B CN201710664999.3A CN201710664999A CN107359800B CN 107359800 B CN107359800 B CN 107359800B CN 201710664999 A CN201710664999 A CN 201710664999A CN 107359800 B CN107359800 B CN 107359800B
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- 230000004907 flux Effects 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000004804 winding Methods 0.000 claims abstract description 91
- 238000001514 detection method Methods 0.000 claims abstract description 56
- 238000006243 chemical reaction Methods 0.000 claims abstract description 24
- 230000015572 biosynthetic process Effects 0.000 claims description 14
- 238000003786 synthesis reaction Methods 0.000 claims description 14
- 230000003321 amplification Effects 0.000 claims description 11
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 11
- 238000012795 verification Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
- H02M5/12—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion of voltage or current amplitude only
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Abstract
The invention provides a multi-range current converter based on zero magnetic flux compensation and a compensation method, wherein a primary winding, a first secondary winding and an nth secondary winding are wound on a power conversion magnetic core and an error detection magnetic core together, a compensation winding is further wound on the power conversion magnetic core, a zero magnetic flux detection winding is further wound on the error detection magnetic core, an output range switching unit is connected on the first secondary winding and the nth secondary winding, and a zero magnetic flux compensation unit is connected between the compensation winding and the zero magnetic flux detection winding; the gain adjustment unit in the zero magnetic flux compensation unit is designed to meet the requirement of different amounts Cheng Raozu on output loop gain balance, so that the stability of output of the current conversion system is ensured, and the consistency of output precision in different measuring range states is ensured.
Description
Technical Field
The invention relates to a multi-range current converter, in particular to a multi-range current converter based on zero magnetic flux compensation and a compensation method.
Background
As gateway electric energy meters are increasingly applied, verification requirements are increasingly greater. In order to improve verification efficiency, centralized synchronous verification of gateway electric energy meters with different current specifications must be realized. In the verification process, a multi-range high-precision current converter is used, firstly, the electric isolation from the primary current to the secondary current is realized, and each epitope is ensured to work under the equipotential condition; and secondly, the primary current is converted into the secondary current in a proportional and accurate mode. The existing current converter cannot meet the requirements, so that a multi-range high-precision current converter based on zero magnetic flux compensation is needed.
Disclosure of Invention
The invention aims to solve the defects and shortcomings of the existing current converter, provides a multi-range current converter based on zero magnetic flux compensation, and realizes centralized synchronous verification of electric energy meters with different calibration current gateways so as to improve verification efficiency.
The technical scheme of the invention is as follows: the utility model provides a multiscale current transformer based on zero magnetic flux compensation, includes power conversion magnetic core, error detection magnetic core, primary winding, first secondary winding and nth secondary winding are wound jointly on power conversion magnetic core and error detection magnetic core, still wind the compensation winding on the power conversion magnetic core, still wind the zero magnetic flux detection winding on the error detection magnetic core, be connected with output range switching unit on first secondary winding and the nth secondary winding, be connected with zero magnetic flux compensation unit between compensation winding and the zero magnetic flux detection winding.
The zero magnetic flux compensation unit comprises a zero magnetic flux error detection unit, an error synthesis unit, a gain adjustment unit, a power amplification unit and a feedback unit which are connected together.
The zero magnetic flux error detection unit is connected with the zero magnetic flux detection winding and converts magnetic flux errors in the error detection magnetic core detected by the zero magnetic flux detection winding into electric signals to be output, the electric signals output by the zero magnetic flux error detection unit and the feedback unit are subjected to error synthesis through the error synthesis unit, the error synthesis unit sends the synthesized error signals into the gain adjustment unit, the power amplification unit is used for carrying out power amplification, and the amplified synthesized error signals are injected into the compensation winding.
The first secondary winding and the n secondary winding are n groups of secondary windings connected in parallel, and the n groups of secondary windings connected in parallel are connected to the output range switching unit and are controlled by the output range switching unit to be output and switched to the corresponding secondary output windings.
The power conversion magnetic core and the error detection magnetic core are arranged in parallel.
A zero magnetic flux compensation method of a multirange current transformer based on zero magnetic flux compensation comprises the following steps:
when alternating current is applied to a primary winding N11 of the current converter, an output switching unit controls output to be switched to a corresponding secondary output winding N21 or N2N;
the zero magnetic flux detection winding Ne carries out error detection on magnetic flux in the T2 magnetic core and converts the magnetic flux into electric signals to be output through a zero magnetic flux error detection unit;
the error electric signal detected by the zero magnetic flux error detection unit is subjected to error synthesis with the feedback unit;
the synthesized error signal is sent to a gain adjusting unit matched with the output range winding, and then amplified by power, and the amplified signal is injected to a compensation winding of the T1 magnetic core;
the equivalent input magnetomotive force of the power core T1 is increased, thereby reducing the conversion error of the input primary current to the secondary current.
The invention has the technical effects that: the multi-range winding design structure based on parallel connection of double magnetic cores is provided, and the wide range of the output current range is realized, so that the verification requirements of the gateway electric energy meter with different current specifications are met; the gain adjustment unit in the zero magnetic flux compensation unit is designed to meet the requirement of different amounts Cheng Raozu on output loop gain balance, so that the stability of output of the current conversion system is ensured, and the consistency of output precision in different measuring range states is ensured.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic diagram of compensation effect detection according to the present invention.
Reference numerals in the drawings denote: the device comprises a 1-output range switching unit, a 2-zero magnetic flux compensation unit, a 20-zero magnetic flux error detection unit, a 21-error synthesis unit, a 22-gain adjustment unit, a 23-power amplification unit, a 24-feedback unit, a T1-power conversion magnetic core, a T2-error detection magnetic core, an N11-primary winding, an N21-first secondary winding, an N2N-nth secondary winding, an Nb-compensation winding and an Ne-zero magnetic flux detection winding.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, the multi-range current transformer based on zero magnetic flux compensation comprises a power conversion magnetic core T1, an error detection magnetic core T2, a primary winding N11, a first secondary winding N21 and an N-th secondary winding N2N, wherein the primary winding N11, the first secondary winding N21 and the N-th secondary winding N2N are wound on the power conversion magnetic core T1 and the error detection magnetic core T2 together, a compensation winding Nb is further wound on the power conversion magnetic core T1, a zero magnetic flux detection winding Ne is further wound on the error detection magnetic core T2, an output range switching unit 1 is connected on the first secondary winding N21 and the N-th secondary winding N2N, and a zero magnetic flux compensation unit 2 is connected between the compensation winding Nb and the zero magnetic flux detection winding Ne.
The zero-flux compensation unit 2 includes a zero-flux error detection unit 20, an error synthesis unit 21, a gain adjustment unit 22, a power amplification unit 23, and a feedback unit 24, which are connected together.
The zero magnetic flux error detecting unit 20 is connected to the zero magnetic flux detecting winding Ne and converts the magnetic flux error in the error detecting magnetic core T2 detected by the zero magnetic flux detecting winding Ne into an electric signal to be output, the electric signal output by the zero magnetic flux error detecting unit 20 and the feedback unit 24 are subjected to error synthesis by the error synthesizing unit 21, the error synthesizing unit 21 sends the synthesized error signal to the gain adjusting unit 22, and then the power amplifying unit 23 amplifies the power, and the amplified synthesized error signal is injected into the compensation winding Nb.
The first secondary winding N21 and the N secondary winding N2N are N groups of secondary windings connected in parallel, and the N groups of secondary windings connected in parallel are connected to the output range switching unit 1 and are controlled by the output range switching unit 1 to be output and switched to the corresponding secondary output windings.
The power conversion magnetic core T1 and the error detection magnetic core T2 are arranged in parallel.
When an alternating current is applied to the primary winding N11 of the current transformer, the output switching unit controls the output to be switched to the corresponding secondary output winding N21 or N2N, and a part of the current applied to the primary winding is converted into exciting current due to the existence of an output load, and the other part is consumed in the iron loss and the magnetic loss. Therefore, magnetomotive force generated by the primary current and magnetomotive force generated by the secondary current have magnetic balance errors, at the moment, the zero magnetic flux detection winding Ne detects magnetic flux errors in the T2 magnetic core and converts the magnetic flux errors into electric signals to be output through the zero magnetic flux error detection unit, the signals and the feedback unit perform error synthesis, a synthesized error signal is sent to the gain adjustment unit matched with the output range winding, and then amplified signals are injected into the compensation winding of the T1 magnetic core through power amplification to increase equivalent input magnetomotive force of the power magnetic core T1, so that conversion errors from input primary current to secondary current are reduced. Through proper selection of the error detection magnetic core T2, design of turns of the error detection winding Ne and the compensation winding Nb and gain control of the zero magnetic flux compensation unit, the T1 magnetic core can work in a near zero magnetic flux state, so that high-precision conversion of the multi-range current converter is realized.
Through the design of the zero-flux current transformer and the construction of an actual compensation circuit for testing, an oscilloscope is used for observing an error detection signal of the error detection unit 20 and a compensation signal of the power amplification unit 23, in fig. 2, a thick line waveform is an error unit detection waveform, a thin line waveform is a compensation waveform, the error detection signal is about 21.29mV, the compensation signal is 3.149V, and the amplification is about 148 times. The data of the primary and secondary ratio differences and the angle difference before and after compensation are shown in the following chart, the three-phase ratio difference after compensation is better than 0.01 percent in the range of 0.05 to 20A, and the angle difference is better than 0.005 degrees.
Table I Compare difference before Compensation
The ratio difference after the second compensation
The angular difference before the compensation of table three
Table four compensated angular differences
According to the multi-range current converter and the compensation method based on zero magnetic flux compensation, a multi-range winding design structure based on parallel connection of double magnetic cores is provided, and the wide range of an output current range is realized, so that the verification requirements of gateway electric energy meters with different current specifications are met; the gain adjustment unit in the zero magnetic flux compensation unit is designed to meet the requirement of different amounts Cheng Raozu on output loop gain balance, so that the stability of output of the current conversion system is ensured, and the consistency of output precision in different measuring range states is ensured.
Claims (2)
1. The zero-flux compensation method of the multi-range current converter based on zero-flux compensation is characterized by comprising a power conversion magnetic core (T1), an error detection magnetic core (T2), a primary winding (N11), a first secondary winding (N21) and an nth secondary winding (N2N), wherein the primary winding (N11), the first secondary winding (N21) and the nth secondary winding (N2N) are wound on the power conversion magnetic core (T1) and the error detection magnetic core (T2) together, a compensation winding (Nb) is further wound on the power conversion magnetic core (T1), a zero-flux detection winding (Ne) is further wound on the error detection magnetic core (T2), an output switching unit (1) is connected on the first secondary winding (N21) and the nth secondary winding (N2N), and a zero-flux compensation unit (2) is connected between the compensation winding (Nb) and the zero-flux detection winding (Ne);
the zero magnetic flux compensation unit (2) comprises a zero magnetic flux error detection unit (20), an error synthesis unit (21), a gain adjustment unit (22), a power amplification unit (23) and a feedback unit (24) which are connected together;
the zero magnetic flux error detection unit (20) is connected with the zero magnetic flux detection winding (Ne) and converts magnetic flux errors in the error detection magnetic core (T2) detected by the zero magnetic flux detection winding (Ne) into electric signals to be output, the electric signals output by the zero magnetic flux error detection unit (20) and the feedback unit (24) are subjected to error synthesis through the error synthesis unit (21), the error synthesis unit (21) sends the synthesized error signals to the gain adjustment unit (22), the power amplification unit (23) is used for carrying out power amplification, and the amplified synthesized error signals are injected into the compensation winding (Nb);
the first secondary winding (N21) and the N secondary winding (N2N) are N groups of secondary windings connected in parallel, the N groups of secondary windings connected in parallel are connected to the output range switching unit (1) and the output range switching unit (1) controls the output to be switched to the corresponding secondary output windings,
the zero magnetic flux compensation method comprises the following steps:
when alternating current is applied to a primary winding (N11) of the current converter, an output range switching unit controls output to be switched to a corresponding secondary winding;
the zero magnetic flux detection winding (Ne) carries out error detection on magnetic flux in the error detection magnetic core (T2), and the magnetic flux is converted into an electric signal to be output through the zero magnetic flux error detection unit;
the error electric signal detected by the zero magnetic flux error detection unit is subjected to error synthesis with the feedback unit;
the synthesized error signal is sent to a gain adjusting unit matched with the output range winding, and then amplified by power, and the amplified signal is injected into a compensation winding of a power conversion magnetic core (T1);
the equivalent input magnetomotive force of the power conversion core (T1) is increased, thereby reducing the conversion error of the input primary current to the secondary current.
2. The method for zero-flux compensation of a multirange current transformer based on zero-flux compensation of claim 1, wherein: the power conversion magnetic core (T1) and the error detection magnetic core (T2) are arranged in parallel.
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| CN201710664999.3A CN107359800B (en) | 2017-08-07 | 2017-08-07 | Multi-range current converter based on zero magnetic flux compensation and compensation method |
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| CN107359800B true CN107359800B (en) | 2023-11-10 |
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| CN113030837A (en) * | 2021-03-04 | 2021-06-25 | 青岛鼎信通讯股份有限公司 | Full-range current output module and method based on electric energy meter calibrating device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203871167U (en) * | 2014-06-18 | 2014-10-08 | 海盐盛迪电子科技有限公司 | Center penetrating type isolation current transformer |
| CN204857430U (en) * | 2015-07-09 | 2015-12-09 | 广西电网有限责任公司电力科学研究院 | Monitoring metal zinc oxide arrester's zero passive magnetic flow current transformer |
| CN106298214A (en) * | 2016-09-23 | 2017-01-04 | 国网江西省电力公司电力科学研究院 | A kind of wide-range Zero flux current ratio changer |
| CN206948193U (en) * | 2017-08-07 | 2018-01-30 | 国家电网公司 | A kind of multrirange power pack based on Zero flux compensation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8421444B2 (en) * | 2009-12-31 | 2013-04-16 | Schneider Electric USA, Inc. | Compact, two stage, zero flux electronically compensated current or voltage transducer employing dual magnetic cores having substantially dissimilar magnetic characteristics |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203871167U (en) * | 2014-06-18 | 2014-10-08 | 海盐盛迪电子科技有限公司 | Center penetrating type isolation current transformer |
| CN204857430U (en) * | 2015-07-09 | 2015-12-09 | 广西电网有限责任公司电力科学研究院 | Monitoring metal zinc oxide arrester's zero passive magnetic flow current transformer |
| CN106298214A (en) * | 2016-09-23 | 2017-01-04 | 国网江西省电力公司电力科学研究院 | A kind of wide-range Zero flux current ratio changer |
| CN206948193U (en) * | 2017-08-07 | 2018-01-30 | 国家电网公司 | A kind of multrirange power pack based on Zero flux compensation |
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