CN105652116B - Back-to-back test circuit based on DC/DC converter - Google Patents

Back-to-back test circuit based on DC/DC converter Download PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
converter
voltage
auxiliary
direct current
test
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201511008924.7A
Other languages
Chinese (zh)
Other versions
CN105652116A (en
Inventor
高冲
杨俊�
王新颖
王秀环
冯健
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMART GRID RESEARCH INSTITUTE OF STATE GRID
State Grid Corp of China SGCC
State Grid Zhejiang Electric Power Co Ltd
Original Assignee
SMART GRID RESEARCH INSTITUTE OF STATE GRID
State Grid Corp of China SGCC
State Grid Zhejiang Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SMART GRID RESEARCH INSTITUTE OF STATE GRID, State Grid Corp of China SGCC, State Grid Zhejiang Electric Power Co Ltd filed Critical SMART GRID RESEARCH INSTITUTE OF STATE GRID
Priority to CN201511008924.7A priority Critical patent/CN105652116B/en
Publication of CN105652116A publication Critical patent/CN105652116A/en
Application granted granted Critical
Publication of CN105652116B publication Critical patent/CN105652116B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements 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

Back-to-back test circuit based on DC/DC converter
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.
CN201511008924.7A 2015-12-29 2015-12-29 Back-to-back test circuit based on DC/DC converter Active CN105652116B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201511008924.7A CN105652116B (en) 2015-12-29 2015-12-29 Back-to-back test circuit based on DC/DC converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201511008924.7A CN105652116B (en) 2015-12-29 2015-12-29 Back-to-back test circuit based on DC/DC converter

Publications (2)

Publication Number Publication Date
CN105652116A CN105652116A (en) 2016-06-08
CN105652116B true CN105652116B (en) 2020-08-04

Family

ID=56477152

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201511008924.7A Active CN105652116B (en) 2015-12-29 2015-12-29 Back-to-back test circuit based on DC/DC converter

Country Status (1)

Country Link
CN (1) CN105652116B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN109194132A (en) * 2018-08-29 2019-01-11 宁夏银利电气股份有限公司 A kind of high frequency transformer temperature field test electric source topology and control method
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
CN105652116A (en) 2016-06-08

Similar Documents

Publication Publication Date Title
Wang et al. Harmonizing AC and DC: A hybrid AC/DC future grid solution
US9502991B2 (en) Hybrid converter and wind power generating system
EP2810353B1 (en) Dc connection scheme for windfarm with internal mvdc collection grid
CN102738836B (en) Alternating current and direct current hybrid micro power grid system and control method thereof
CN103545905B (en) A kind of photovoltaic direct-current micro-grid energy coordination control method
CN103441691B (en) A kind of mode of resonance electronic power convertor and converter device
CN104065157B (en) Uninterruptible power supply with improved power supply reliability
CN103997033B (en) A kind of HVDC transmission system possessing DC Line Fault ride-through capability
CN103895534B (en) Double-current system traction power supply system based on modularized multi-level current converter
CN105024582B (en) A kind of novel two-stage type bidirectional energy-storage converter control system and its control method
CN105811447A (en) Intelligent DC power distribution center-based urban distribution network grid structure
CN102931653A (en) Comprehensive coordination control method of wind-solar direct current micro-grid
CN203071836U (en) Mixed microgrid system and AC/DC coupler thereof
CN103956761B (en) A kind of mixing micro-grid system of extensive energy regenerating power battery pack testing equipment
CN103607032B (en) Renewable energy power generation, power transmission and transformation and electrical network access integral system
CN103516221A (en) Bi-direction direct-current solid-state transformer with high-frequency alternating-current isolation link
WO2013082857A1 (en) Centralized-distributed hybrid new energy power generation system and maximum power point tracking control method
CN103236706B (en) The battery energy storage system of transformation topology is handed over based on modular multilevel
CN105703388B (en) A kind of grid-connected photovoltaic system based on the access of mesohigh direct current
Kan et al. Voltage-fed dual active bridge bidirectional DC/DC converter with an immittance network
CN102593832B (en) Three-wire DC microgrid system suitable for modern buildings and control method thereof.
CN102097966A (en) Cascade megawatt photovoltaic grid-connected inverter
CN203313097U (en) Large power photovoltaic power generation system
CN102684183B (en) DC LAN (Direct Current Local Area Network)-based distributed power generation system and control method
CN102163856A (en) Vehicle-to-grid (V2G)-technology-based vehicle-mounted charging and discharging device and control method thereof

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant