CN105652116B - Back-to-back test circuit based on DC/DC converter - Google Patents
Back-to-back test circuit based on DC/DC converter Download PDFInfo
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- CN105652116B CN105652116B CN201511008924.7A CN201511008924A CN105652116B CN 105652116 B CN105652116 B CN 105652116B CN 201511008924 A CN201511008924 A CN 201511008924A CN 105652116 B CN105652116 B CN 105652116B
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- 238000012360 testing method Methods 0.000 title claims abstract description 39
- 230000005540 biological transmission Effects 0.000 claims description 23
- 239000003990 capacitor Substances 0.000 claims description 13
- 238000009499 grossing Methods 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000010998 test method Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000001502 supplementing effect Effects 0.000 description 1
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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
Abstract
The invention provides a back-to-back test circuit based on a DC/DC converter, which comprises: the back-to-back test circuit includes: the direct current bus, the power module and the DC/DC converter module; the direct current bus connects the power supply module and the DC/DC converter module in series. The test sample is connected back to back, only one end of the direct current voltage needs to be provided for the test sample, the voltage level can be selected according to the rated direct current voltage at the lower side of the test sample, more importantly, the two converters can feed most of the absorbed electric energy back to the power grid, the power supply part of the test circuit only needs to provide smaller output current, the capacity and the manufacturing difficulty of the test equipment are greatly reduced, and the cost of the test equipment and the test operation cost are greatly reduced.
Description
Technical Field
The invention relates to a power electronic system, in particular to a back-to-back test circuit based on a DC/DC converter.
Background
The requirements of access of distributed renewable energy sources, power supply of ocean islands, centralized sending of offshore wind farm clusters and the like provided by constructing a novel urban power grid make the traditional alternating current power grid face more and more challenges. The direct-current transmission network based on the high-voltage direct-current transmission technology provides a flexible, economic and efficient technical means for solving the problems, and becomes one of the research hotspots in the technical field of the power grid in the world at present.
In an alternating current power grid, an alternating current transformer realizes conversion between different voltage levels, and in a direct current power grid, a DC/DC converter realizes direct current voltage interconnection and voltage conversion of different levels. The main function of the system comprises the realization of the connection of direct current networks with different voltage levels, different direct current technologies and different topological types; realizing power exchange among different subsystems; electrical isolation between different sub-networks is achieved; the access of a power plant or a load in the middle of a remote direct current transmission line is realized; and long-distance small-capacity power transmission is realized.
The DC/DC converter directly determines the safety and the economy of a direct-current power grid, so a technical scheme for detecting the performance of the DC/DC converter is needed to break through the current research aiming at the high-voltage high-capacity DC/DC converter, most research institutions are in the stages of theoretical analysis and simulation verification, small-capacity experimental prototype development is partially carried out, and the current situation of large gap from engineering application exists.
Disclosure of Invention
In order to overcome the above-mentioned defects of the prior art, the present invention provides a back-to-back test circuit based on DC/DC converters, which includes: the back-to-back test circuit includes: the direct current bus, the power module and the DC/DC converter module; the direct current bus connects the power supply module and the DC/DC converter module in series.
The power module includes: the three-phase rectifier bridge, the smoothing reactor and the two capacitors are connected in sequence to form a series circuit; the secondary side of the transformer is connected with the three-phase rectifier bridge, and the initial end of the alternating current power supply is grounded; one end of a capacitor branch in the series circuit is connected with one end of the isolating switch, and the other end of the capacitor branch is connected with the direct current bus; the midpoint of the capacitor branch is grounded.
The DC/DC converter module includes: an auxiliary DC/DC converter and a DC/DC converter to be tested; + -U of auxiliary DC/DC converter and DC/DC converter to be testedd1The positive terminal at one side of the voltage is connected with a positive bus bar, +/-Ud1The negative end on one voltage side is connected with a negative bus; + -U of auxiliary DC/DC converterd2Positive terminal of one side and + -U of DC/DC converter to be testedd2Positive pole terminal at one side is connected to assist the positive pole terminal of DC/DC converterUd2One side negative terminal and + -U of DC/DC converter to be testedd2The negative terminal on one side is connected.
Under the normal operating mode state, isolator is closed, and the power transmission direction of DC/DC converter module includes: a forward transmission mode and a reverse transmission mode.
The forward transmission mode includes: + -U of DC/DC converter to be testedd1The voltage side absorbs electric energy from the DC bus, and the voltage side is from the +/-U of the tested DC/DC converterd2The voltage side transmits electric energy to the auxiliary DC/DC converter, and after the auxiliary DC/DC converter absorbs the energy, the electric energy is transmitted from +/-U of the auxiliary DC/DC converterd1And the voltage side feeds back the electric energy to the direct current bus.
The reverse transmission mode includes: + -U of auxiliary DC/DC converterd1Voltage side absorbs power from DC bus, from + -U of auxiliary DC/DC converterd2The voltage side transmits electric energy to the DC/DC converter to be tested, and after the DC/DC converter to be tested absorbs the energy, the energy is transmitted from +/-U of the DC/DC converter to be testedd1And the voltage side feeds back the electric energy to the direct current bus.
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
1. according to the invention, two capacitors C are connected in series, and the midpoint of each capacitor is selectively grounded to form positive and negative voltages to meet the test requirements of a high-voltage high-capacity DC/DC converter with symmetrical positive and negative voltages;
2. the test circuit of the invention has only one power supply, the output energy of the power supply is absorbed by the tested DC/DC converter, and is fed back to the power supply through the auxiliary DC/DC converter, or is absorbed by the auxiliary DC/DC converter, and is fed back to the power supply through the tested DC/DC converter, only a small loss part in the middle is used for supplementing the loss of the circuit, thereby realizing full power circulation and power bidirectional transmission, and not only checking the full voltage and full current of the test product, but also checking the performance of the test product power bidirectional transmission;
3. the test sample is connected back to back, only one end of the direct current voltage needs to be provided for the test sample, the voltage level can be selected according to the rated direct current voltage at the lower side of the test sample, more importantly, the two converters can feed most of the absorbed electric energy back to the power grid, the power supply part of the test circuit only needs to provide smaller output current, the capacity and the manufacturing difficulty of the test equipment are greatly reduced, and the cost of the test equipment and the test operation cost are greatly reduced.
Drawings
Fig. 1 is a schematic diagram of a back-to-back test method of a high-voltage high-capacity DCDC converter.
Detailed Description
The test method of the present invention is described in further detail below with reference to FIG. 1.
The test method mainly aims at a test method of a high-voltage large-capacity DC/DC converter, a circuit schematic diagram of the test method is shown in figure 1, the circuit mainly comprises a power supply part and a test article part, wherein the power supply part comprises a grounding part E, an alternating current voltage source AC, a circuit breaker QF, a transformer TM, a three-phase rectifier bridge U, a smoothing reactor L, two series capacitors C and an isolating switch QS, wherein the primary side of the transformer is connected with an alternating current power supply through the circuit breaker, the secondary side of the transformer is connected with the three-phase rectifier bridge, the three-phase rectifier bridge rectifies alternating current transmitted by the alternating current power supply into direct current, the direct current is charged into the capacitors C through the smoothing reactor, a direct current voltage with small fluctuation amplitude is formed, the middle points of the two capacitors are grounded, the direct current voltage is in positive and negative symmetry, and the test article part is mainly connected back to back by two DC/DC converters withd1) Connected to the positive and negative bus bars and the other end (± U)d2) Directly connected, one is used as a tested object, and the other is used as auxiliary equipment. In this way, for the sample DC/DC converter, the primary side direct-current voltage is supplied by the direct-current voltage source, and the secondary side direct-current voltage is supplied by the secondary side of the auxiliary DC/DC converter, so that the step-up and step-down and power conversion of the DC/DC converter are realized.
When the test is started, the isolating switch QS is closed firstly, then the breaker QF is closed, the three-phase rectifier bridge U is started, and the DC/DC converter is set to be in a charging mode for charging before the test. After charging, the sample is switched to a normal working mode, and according to the power transmission direction of the sample, the sample can be divided into a forward transmission mode and a reverse transmission mode:
(1) forward transmission mode: + -U of DC/DC converter to be testedd1The voltage side absorbs electric energy from the direct current bus, and the electric energy is converted from +/-U after passing through the internal electric energyd2The voltage side transmits the electric energy to the auxiliary DC/DC converter, and the auxiliary DC/DC converter absorbs the energy and then the +/-U of the energy is absorbed by the auxiliary DC/DC converterd1The voltage side feeds back the electric energy to the positive and negative DC buses, and the current i1、i2、i1' flow in the direction shown in fig. 1, completing the power forward cycle process.
(2) Reverse transmission mode: auxiliary DC/DC converter + -U opposite to forward transmission mode power circulation directiond1The voltage side absorbs electric energy from the direct current bus, and the electric energy is converted from +/-U after passing through the internal electric energyd2The voltage side transmits the electric energy to the DC/DC converter to be tested, and the DC/DC converter absorbs the energy and then the +/-U of the DC/DC converter is converted into the electric energyd1The voltage side feeds back the electric energy to the positive and negative DC buses, and the current i1、i2、i1' the flow direction is opposite to that shown in fig. 1, completing the power reversal cycle process.
The power cycle size and the transmission direction are realized by the control of the tested DC/DC converter and the auxiliary DC/DC converter.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (4)
1. A back-to-back test circuit based on a DC/DC converter, comprising:
the back-to-back test circuit includes: the direct current bus, the power module and the DC/DC converter module;
the direct current bus connects the power supply module and the DC/DC converter module in series;
the power module includes: the three-phase rectifier bridge, the smoothing reactor and the two capacitors are connected in sequence to form a series circuit;
the secondary side of the transformer is connected with the three-phase rectifier bridge, and the starting end of the alternating current voltage source is grounded;
the back-to-back test circuit further comprises an isolating switch;
one end of a capacitor branch in the series circuit is connected with one end of the isolating switch, and the other end of the capacitor branch is connected with the direct current bus; the midpoint of the capacitor branch is grounded;
in a normal operation mode, the isolation switch is closed, and a power transmission direction of the DC/DC converter module includes: a forward transmission mode and a reverse transmission mode.
2. The back-to-back test circuit of claim 1, wherein the DC/DC converter module comprises: an auxiliary DC/DC converter and a DC/DC converter to be tested;
+ -U of the auxiliary DC/DC converter and the DC/DC converter under testd1The positive terminal at one side of the voltage is connected with a positive bus, the plus or minus Ud1The negative end on one voltage side is connected with a negative bus;
+ -U of the auxiliary DC/DC converterd2Positive terminal of one side and + -U of the DC/DC converter under testd2Positive terminal of one side is connected, and plus or minus U of the auxiliary DC/DC converterd2One negative terminal and + -U of the DC/DC converter under testd2The negative terminal on one side is connected.
3. The back-to-back test circuit of claim 2,
the forward transmission mode includes: + -U of the DC/DC converter under testd1The voltage side absorbs electric energy from the direct current bus, and the voltage side absorbs electric energy from +/-U of the tested DC/DC converterd2The voltage side transmits electric energy to the auxiliary DC/DC converter, and after the auxiliary DC/DC converter absorbs the energy, the auxiliary DC/DC converter outputs +/-U (direct current) of the auxiliary DC/DC converterd1The voltage side converts the electric energyAnd feeding back to the direct current bus.
4. The back-to-back test circuit of claim 2,
the reverse transmission mode includes: + -U of the auxiliary DC/DC converterd1The voltage side absorbs electric energy from the DC bus, from the +/-U of the auxiliary DC/DC converterd2The voltage side transmits electric energy to the DC/DC converter to be tested, and after the DC/DC converter to be tested absorbs the energy, the DC/DC converter to be tested is subjected to +/-Ud1And feeding back the electric energy to the direct current bus at one voltage side.
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| CN201511008924.7A CN105652116B (en) | 2015-12-29 | 2015-12-29 | Back-to-back test circuit based on DC/DC converter |
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| CN201511008924.7A CN105652116B (en) | 2015-12-29 | 2015-12-29 | Back-to-back test circuit based on DC/DC converter |
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| CN105652116B true CN105652116B (en) | 2020-08-04 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106019174A (en) * | 2016-07-20 | 2016-10-12 | 许继集团有限公司 | Test circuit and method for electric and electronic transformer DC-DC power module |
| CN109194132B (en) * | 2018-08-29 | 2021-06-11 | 宁夏银利电气股份有限公司 | Control method for high-frequency transformer temperature field test power supply topology |
| CN110196371B (en) * | 2019-06-28 | 2021-02-23 | 潍柴动力股份有限公司 | Test system of DC-DC converter |
| CN112014665A (en) * | 2020-08-07 | 2020-12-01 | 清华大学 | Fuel cell high-power DC-DC converter test system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW583400B (en) * | 2002-12-26 | 2004-04-11 | Ind Tech Res Inst | DC/DC converter burn-in testing method and system using an active feedback load |
| CN101083860A (en) * | 2006-06-01 | 2007-12-05 | 索尼株式会社 | Drive device for light emitting diode element, light source device, and display |
| CN102323546A (en) * | 2011-08-25 | 2012-01-18 | 中国电力科学研究院 | Back-to-back test method of VSC-HVDC MMC valve stable state operation test |
| JP2013021790A (en) * | 2011-07-08 | 2013-01-31 | Advantest Corp | Control circuit and control method for switching power supply, and test device using them |
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2015
- 2015-12-29 CN CN201511008924.7A patent/CN105652116B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW583400B (en) * | 2002-12-26 | 2004-04-11 | Ind Tech Res Inst | DC/DC converter burn-in testing method and system using an active feedback load |
| CN101083860A (en) * | 2006-06-01 | 2007-12-05 | 索尼株式会社 | Drive device for light emitting diode element, light source device, and display |
| JP2013021790A (en) * | 2011-07-08 | 2013-01-31 | Advantest Corp | Control circuit and control method for switching power supply, and test device using them |
| CN102323546A (en) * | 2011-08-25 | 2012-01-18 | 中国电力科学研究院 | Back-to-back test method of VSC-HVDC MMC valve stable state operation test |
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