CN107966626B - Power module test system of power electronic transformer - Google Patents
Power module test system of power electronic transformer Download PDFInfo
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- CN107966626B CN107966626B CN201711245939.4A CN201711245939A CN107966626B CN 107966626 B CN107966626 B CN 107966626B CN 201711245939 A CN201711245939 A CN 201711245939A CN 107966626 B CN107966626 B CN 107966626B
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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
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
A power electronic transformer power module test system comprises a three-phase uncontrollable rectifier bridge and two power electronic transformer power modules to be tested. Each power module consists of an H-bridge unit and a double-active-bridge series resonance type DC-DC converter. The two power modules to be tested are connected in parallel through the filter inductor. The flow of active power is controlled by controlling the phase angle difference of the two power module modulation strategies through an open loop, so that the tested power module works at set current and voltage to test the steady-state operation condition. The invention can simulate the operation condition of the power module of the real three-phase cascade H-bridge power electronic transformer and provides convenience for the circuit parameter design of the power module of the real system.
Description
Technical Field
The invention relates to a power module testing device of a power electronic transformer.
Background
In the power distribution network, distribution transformers are the most commonly applied equipment, and the annual output of the distribution transformers in China is 1/3 of the annual output of all transformers. Therefore, the performance of the distribution transformer is related to the performance of the future smart grid, and the traditional transformer can not meet the requirements of high power supply quality and intellectualization of the future smart grid.
Compared with the traditional transformer, the power electronic transformer not only has the functions of voltage grade conversion and electrical isolation, but also can realize bidirectional flow of tide, power quality control, automatic protection of devices and bidirectional flow of energy of alternating current and direct current ports with different voltage grades. Therefore, the power electronic transformer is an important component of an intelligent power grid, an energy internet and a future alternating current-direct current interconnected power grid, and takes charge of the electric energy conversion and processing of the future power grid.
As a power device applied to a power distribution system, the conventional topology mainly comprises a cascading H-bridge type and a modular multi-level converter type, and aiming at the three-phase cascading H-bridge type power electronic transformer, a power module of the power electronic transformer consists of an H-bridge unit and a double-active-bridge series resonance type DC-DC converter, in order to test the running condition of the power module under the steady-state working condition, circuit parameters are reasonably designed, an actual device needs to be connected to a grid and closed-loop control is carried out at the same time, and the measurement difficulty of the power module is increased because the voltage of the high-voltage side of a power distribution network is 6-35 kV, and the voltage and the current of the network side need to be acquired by the.
The existing test method has the disadvantages that a power module needs to adopt a complex control method during measurement, and more voltage sensors and current sensors are needed, so that the cost of a test system and the difficulty of measurement are increased.
Disclosure of Invention
The invention aims to overcome the defects of complex control and higher cost of the power module of the conventional three-phase power electronic transformer during testing, and provides a power module testing system. The invention does not need to connect the power electronic transformer in a grid, and only needs to change the phase of the reference modulation wave signal of the H-bridge unit connected with the double-active-bridge series resonance type DC-DC converter in the power module by an open-loop control method to realize the simulation of the operating characteristics of the three-phase cascade H-bridge power electronic transformer power module in a real system.
The test system consists of a three-phase uncontrollable rectifier bridge and two power modules to be tested. The input end of the three-phase uncontrollable rectifier bridge is connected with an external three-phase alternating current power supply, and the output end of the three-phase uncontrollable rectifier bridge is respectively connected with the double-active-bridge series resonance type DC-DC transformer connected in parallel with the two power modules to be testedDC energy storage capacitor C on secondary side of converterLTwo power modules to be tested are connected through a filter inductor Lg2And (4) connecting in parallel. An external alternating current power supply is rectified through a three-phase uncontrollable rectifier bridge, and the rectified output provides direct current voltage for the two power modules to be tested.
Each power module to be tested consists of a double-active-bridge series resonance type DC-DC converter and an H-bridge unit. The direct current output terminals of the H-bridge unit are c and d, and the input terminal is x2、y2. Input terminal x of H-bridge unit of two power modules2Through a filter inductor Lg2Connected to, input terminal y2Are directly connected. The double-active-bridge series resonance type DC-DC converter is composed of a primary side direct current energy storage capacitor CHPrimary side H-bridge unit and primary resonance capacitor Cr1High frequency transformer TFSecondary resonance capacitor Cr2Secondary side DC energy storage capacitor CLAnd a secondary side H bridge unit. Primary side H bridge unit and primary side direct current energy storage unit CHConnected in parallel, the secondary side H bridge unit and the secondary side direct current energy storage unit CLAre connected in parallel; terminal e of primary side H-bridge unit and primary resonance capacitor Cr1Is connected with the positive pole of the secondary side H-bridge unit, and the terminal g of the secondary side H-bridge unit is connected with the resonance capacitor Cr2Is connected with the negative pole of the high-frequency transformer TFPrimary upper end and primary resonance capacitor Cr1Is connected with the negative pole of the high-frequency transformer TFIs connected to a terminal f of the primary side H-bridge unit, and a high-frequency transformer TFSecondary upper end and secondary resonance capacitor Cr2Is connected with the positive pole of the high-frequency transformer TFIs connected to the terminal H of the secondary side H-bridge unit. Primary side direct current energy storage capacitor C of simultaneous double-active-bridge series resonance type DC-DC converterHThe two ends of the secondary side are respectively connected with a direct current output C terminal and a d terminal of the H-bridge unit, and a direct current energy storage capacitor C at the secondary sideLRespectively connected with the output terminals a and b of the three-phase uncontrollable rectifier bridge.
The three-phase uncontrollable rectifier bridge consists of a diode rectifier bridge and a filter inductor Lg1And a filter capacitor C1And (4) forming. External three-phase AC power supply connection diode rectifierInput terminal x of current bridge1、y1And z1The upper end of the output of the diode rectifier bridge is connected with a filter inductor Lg1And a filter capacitor C1An output terminal a is formed behind the anode, and the lower end of the output of the diode rectifier bridge is connected with a filter capacitor C1The negative electrode forms an output terminal b.
When the test system works normally, the H-bridge units in the two power modules are subjected to open-loop control, and the running condition of the power modules under the steady-state working condition is tested. The drive signal of the H-bridge unit is generated by unipolar or bipolar sine pulse width modulation, and the sine modulation signals have the same frequency and amplitude, different phases and the same carrier signals. The working process of the invention is as follows:
(1) an external three-phase power frequency alternating current power supply is a double-active-bridge series resonance type DC-DC converter transformer secondary side direct current energy storage capacitor C through a three-phase uncontrollable rectifier bridgeLProviding a direct current voltage;
(2) the double-active-bridge series resonance type DC-DC converter adopts an open-loop voltage output control method with a 50% square wave duty ratio, and the switching frequency and the series resonance frequency of IGBTs in the primary side H-bridge unit and the secondary side H-bridge unit are the same;
(3) when a certain power module is tested, the phase of the sinusoidal modulation signal of the H-bridge unit corresponding to the power module lags behind that of another power module to be tested, and the power module to be tested is equivalent to an inverter alternating current power supply at the moment and provides active power for the power module to be tested.
The power module test system of the power electronic transformer has the following characteristics:
1. the power module of the power electronic transformer does not need to be connected to the grid;
2. the power module of the power electronic transformer adopts open-loop control in the test process, complex closed-loop control is not needed, and the control method is simpler.
Drawings
FIG. 1 is a schematic circuit diagram of a test system to which the present invention is applied;
in the figure: 1. the system comprises a single-phase uncontrollable rectifier bridge circuit, a 2 double-active-bridge series resonant DC-DC converter, a 3H bridge unit, a 4 power electronic transformer power module, a 5 power electronic transformer power module, a 6 double-active-bridge series resonant DC-DC converter primary H bridge unit and a 7 double-active-bridge series resonant DC-DC converter secondary H bridge unit.
Detailed Description
The invention is further described below with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, the testing system of the invention is composed of a three-phase uncontrollable rectifier bridge 1 and two power modules 4 and 5 to be tested. The input end of a three-phase uncontrollable rectifier bridge 1 is connected with an external three-phase alternating current power supply, the output end of the three-phase uncontrollable rectifier bridge 1 is respectively connected with secondary side direct current energy storage capacitors C of two parallel-connected power modules 4 and 5 to be tested and double active bridges series resonance type DC-DC converters 2LTwo power modules 4 and 5 to be tested are connected through a filter inductor Lg2And (4) connecting in parallel.
Each power module to be tested consists of a double-active-bridge series resonance type DC-DC converter 2 and an H-bridge unit 3. The DC output terminals of the H-bridge unit 3 are c and d, and the input terminal is x2、y2. Input terminals x of two power modules 4, 52Through a filter inductor Lg2Connected, input terminals y of two power modules 4, 5 to be tested2Are directly connected. The double-active-bridge series resonance type DC-DC converter 2 consists of a primary side direct current energy storage capacitor CHPrimary side H-bridge unit 6, primary resonance capacitor Cr1High frequency transformer TFSecondary resonance capacitor Cr2A secondary side H-bridge unit 7, and a secondary side DC energy storage capacitor CLAnd (4) forming. Primary side H bridge unit 6 and primary side DC energy storage unit CHConnected in parallel, the secondary side H bridge unit 7 and the secondary side direct current energy storage unit CLConnected in parallel, the terminal e of the primary side H-bridge unit 6 and the primary resonance capacitor Cr1Is connected to the positive terminal of the secondary side H-bridge unit 7, and the terminal g of the secondary side H-bridge unit 7 is connected to the resonant capacitor Cr2Is connected with the negative pole of the high-frequency transformer TFPrimary upper end and primary resonance capacitor Cr1Is connected with the negative pole of the high-frequency transformer TFIs connected to a terminal f of the primary side H-bridge unit 6, a high frequency transformer TFSecondary upper end and secondary harmonic ofVibration capacitance Cr2Is connected with the positive pole of the high-frequency transformer TFIs connected to the terminal H of the secondary side H-bridge unit 7. Simultaneous high-frequency transformer TFPrimary side dc energy storage capacitor CHAre respectively connected with the direct current output c terminal and the d terminal of the H-bridge unit 3, and a high-frequency transformer TFSecondary side dc energy storage capacitor CLIs connected to the output terminals a and b of the three-phase uncontrollable rectifier bridge 1 respectively.
The three-phase uncontrollable rectifier bridge 1 consists of a diode rectifier bridge and a filter inductor Lg1And a filter capacitor C1And (4) forming. Three-phase AC power supply connection diode rectifier bridge's input terminal x1、y1And z1The upper end of the output of the diode rectifier bridge is connected with a filter inductor Lg1And a filter capacitor C1An output terminal a of a three-phase uncontrollable rectifier bridge is formed after the positive pole, and the lower output end of the diode rectifier bridge is connected with a filter capacitor C1And an output terminal b of the three-phase uncontrollable rectifier bridge is formed after the negative pole.
When the test system works normally, the running condition of the power module under the steady-state working condition is tested by carrying out open-loop control on the H-bridge unit 3 in the two power modules 4 and 5 to be tested. The driving signal of the H-bridge unit 3 is generated by unipolar or bipolar sinusoidal pulse width modulation, and the sinusoidal modulation signals have the same frequency and amplitude, different phases, and the same carrier signal.
The working principle and the working process of the invention are as follows:
(1) an external three-phase power frequency alternating current power supply is a double-active-bridge series resonance type DC-DC converter 2 secondary side direct current energy storage capacitor C through a three-phase uncontrollable rectifier bridge 1LProviding a dc voltage.
(2) The double-active-bridge series resonance type DC-DC converter 3 adopts an open-loop square wave voltage output control method with a duty ratio of 50%, and the switching frequency and the series resonance frequency of the IGBTs in the primary side H-bridge unit 6 and the secondary side H-bridge unit 7 are the same.
(3) When testing the first power module 4, the phase of the sinusoidal modulation signal of the H-bridge unit 3 corresponding to the first power module 4 lags behind the second power module 5 by an angle, i.e. the phaseIn the difference angle, the second power module 5 is equivalent to an inverter alternating current power supply to provide active power for the first power module 4; when the second power module 5 is tested, the phase of the sinusoidal modulation signal of the H-bridge unit 3 corresponding to the second power module 5 lags behind the angle of the first power module 4, and the first power module 4 is equivalent to an inverted alternating current power supply to provide active power for the second power module 5. If the amplitude of the sinusoidal modulation signal of the H-bridge unit 3 of the two power modules 4, 5 to be tested is V1Then the phase difference angle can be expressed as:
where X is the filter reactance connecting the first power module 4 and the second power module 5, and X2 pi f L2And f is the power frequency of the power grid, L2Filter inductor L for connecting first power module 4 and second power module 5g2P is the rated power value of the first power module 4 and the second power module 5 under the normal working condition respectively.
Claims (2)
1. A power electronic transformer power module test system which characterized in that: the test system comprises a three-phase uncontrollable rectifier bridge (1) and two power modules (4, 5) to be tested; the input end of a three-phase uncontrollable rectifier bridge (1) is connected with an external three-phase alternating current power supply, and the output end of the three-phase uncontrollable rectifier bridge (1) is respectively connected with a direct current energy storage capacitor C which is connected in parallel with the secondary side of a double-active-bridge series resonance type DC-DC converter (2) of two power modules (4, 5) to be testedLTwo power modules (4, 5) to be tested are connected through a filter inductor Lg2Parallel connection;
each power module to be tested consists of a double-active-bridge series resonance type DC-DC converter (2) and an H-bridge unit (3); the DC output terminals of the H-bridge unit (3) are c and d, and the input terminal is x2、y2Input terminals x of two power modules (4, 5) to be tested2Through a filter inductor Lg2Connected, input terminals y of two power modules (4, 5) to be tested2Directly connecting; primary side direct current storage of double-active-bridge series resonance type DC-DC converter (2)Energy capacitor CHThe two ends of the double-active-bridge series resonant DC-DC converter are respectively connected with a direct-current output C terminal and a d terminal of an H-bridge unit (3), and a secondary side direct-current energy storage capacitor C of the double-active-bridge series resonant DC-DC converter (2)LThe anode and the cathode of the three-phase controllable rectifier bridge are respectively connected with output terminals a and b of the three-phase uncontrollable rectifier bridge (1);
the three-phase uncontrollable rectifier bridge (1) consists of a diode rectifier bridge and a filter inductor Lg1And a filter capacitor C1Composition is carried out; three-phase AC power supply connection diode rectifier bridge's input terminal x1、y1And z1The upper end of the output of the diode rectifier bridge is connected with a filter inductor Lg1And a filter capacitor C1An output terminal a of a three-phase uncontrollable rectifier bridge (1) is formed after the positive pole, and the output lower end of the diode rectifier bridge is connected with a filter capacitor C1The negative electrode forms an output terminal b of the three-phase uncontrollable rectifier bridge;
the three-phase alternating current power supply is a secondary side direct current energy storage capacitor C of a double-active-bridge series resonance type DC-DC converter (2) through the three-phase uncontrollable rectifier bridge (1)LProviding electric energy; the double-active-bridge series resonance type DC-DC converter (2) adopts an open-loop square wave voltage output control method with the duty ratio of 50% to test the operation condition of the power module under the steady-state working condition by controlling the H-bridge unit (3).
2. The power module test system according to claim 1, characterized in that open loop control is applied to the H-bridge unit (3) of the two power modules (4, 5) to be tested, the drive signal of the H-bridge unit (3) is generated by unipolar or bipolar sinusoidal pulse width modulation, and the sinusoidal modulation signals have the same frequency and amplitude, different phases and the same carrier signal; when the first power module (4) is tested, the phase of a sinusoidal modulation signal of the H-bridge unit (3) corresponding to the first power module (4) lags behind the phase of a second power module (5), and the second power module (5) is equivalent to an inverted alternating current power supply to provide active power for the first power module (4); when the second power module (5) is tested, the phase of the sinusoidal modulation signal of the H-bridge unit (3) corresponding to the second power module (5) lags behind the first power module (4), the first power module (4) is equivalent to an inverter alternating current power supply, and the sinusoidal modulation signal provides power for the second power module (5)Supplying active power; when the first power module (4) is tested, the phase of the sinusoidal modulation signal of the H-bridge unit 3 corresponding to the first power module (4) lags behind the angle of the second power module (5) and is a phase difference angle, and the second power module (5) is equivalent to an inverted alternating current power supply and provides active power for the first power module (4); when the second power module (5) is tested, the phase of the sinusoidal modulation signal of the H-bridge unit 3 corresponding to the second power module (5) lags behind the angle of the first power module (4), and the first power module (4) is equivalent to an inverted alternating current power supply to provide active power for the second power module (5); if the amplitude of the sinusoidal modulation signal of the H-bridge unit 3 of the two power modules (4, 5) to be tested is V1Then the phase difference angle can be expressed as:
wherein X is a filter reactance connecting the first power module (4) and the second power module (5), and X is 2 pi f L2And f is the power frequency of the power grid, L2Filter inductor L for connecting a first power module (4) and a second power module (5)g2P is the rated power value of the first power module (4) and the second power module (5) under the normal working condition respectively.
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| CN108539769B (en) * | 2018-05-11 | 2020-08-07 | 华北电力大学 | Method for reducing voltage unbalance degree of power distribution network by power electronic transformer |
| CN108959780B (en) * | 2018-07-06 | 2022-12-20 | 中国科学院电工研究所 | Large signal simulation model of single-phase power electronic transformer |
| CN109659977A (en) * | 2018-12-06 | 2019-04-19 | 国网江苏省电力有限公司连云港供电分公司 | A kind of microgrid power switching control method based on electric power electric transformer |
| CN110572042B (en) * | 2019-09-30 | 2020-08-14 | 华中科技大学 | Bilateral asymmetric voltage control method of bidirectional wireless power transmission system |
| CN110716157A (en) * | 2019-11-26 | 2020-01-21 | 国网江苏省电力有限公司南通供电分公司 | Power module test system of power electronic transformer |
| RU2739702C1 (en) * | 2019-12-02 | 2020-12-28 | Илья Николаевич Джус | Transformer testing facility |
| CN111505411B (en) * | 2020-04-09 | 2022-07-22 | 许继电气股份有限公司 | Operation test device and method for double-active-bridge DC/DC conversion module |
| CN113552509A (en) * | 2020-04-24 | 2021-10-26 | 南京南瑞继保电气有限公司 | Operation test circuit of power electronic transformer module and starting method thereof |
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| CN113917264A (en) * | 2021-10-09 | 2022-01-11 | 广东电网有限责任公司 | System and method for detecting power module of flexible loop closing device |
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| CN101707374A (en) * | 2009-11-25 | 2010-05-12 | 中国科学院电工研究所 | Direct current (DC) side capacitor voltage balancing control circuit for H-bridge cascaded active power filter |
| CN101795080A (en) * | 2010-03-03 | 2010-08-04 | 中国科学院电工研究所 | Three-phase power electronics transformer for power distribution |
| CN104578859B (en) * | 2015-01-19 | 2017-01-18 | 西安交通大学 | Voltage-sharing controlling method for direct current bus voltage of single-phase power electronic transformer |
| CN106645916A (en) * | 2015-10-29 | 2017-05-10 | 国网智能电网研究院 | Power test system of high-voltage DC-DC converter |
| CN106451576B (en) * | 2016-10-27 | 2019-04-12 | 西安交通大学 | A kind of control method of the electric power electric transformer of single-phase multi output |
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