CN113552509B - Operation test circuit of power electronic transformer module and starting method thereof - Google Patents
Operation test circuit of power electronic transformer module and starting method thereof Download PDFInfo
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- CN113552509B CN113552509B CN202010331368.1A CN202010331368A CN113552509B CN 113552509 B CN113552509 B CN 113552509B CN 202010331368 A CN202010331368 A CN 202010331368A CN 113552509 B CN113552509 B CN 113552509B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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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
- H02M3/3353—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 at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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- General Physics & Mathematics (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses an operation test circuit of a power electronic transformer module and a starting method thereof, wherein the power electronic transformer module is a two-port converter, and each module at least comprises two conversion modules which are connected in cascade and are marked as a first conversion module and a second conversion module; the ports of the cascade connection of the two conversion modules are direct current ports; the operation test circuit comprises at least two power electronic transformer modules with the structure, and the DC ports connected in series in the two modules are led out and connected with an external DC power supply in parallel; and leading out and connecting the non-cascade connection ports of the first conversion modules of the two modules in parallel, leading out and connecting the non-cascade connection ports of the second conversion modules of the two modules in parallel to respectively form two power pair push loops, and completing a power operation test. Compared with the prior art, the scheme of the invention can perform decoupling operation on the power electronic transformer module, particularly the module with multi-stage connection, and simultaneously improve the system operation efficiency.
Description
Technical Field
The invention belongs to the field of power electronic application, and particularly relates to an operation test circuit of a power electronic transformer module and a starting method thereof.
Background
Compared with the traditional power frequency transformer, the weight and the volume of the transformer are greatly reduced due to the adoption of a high-frequency power electronic technology, and meanwhile, more flexible voltage conversion and energy transmission functions can be realized. When the power electronic transformer is applied to a high-voltage field, a plurality of power electronic transformer modules are often adopted and input into a serial structure (such as ISOP or ISOS) under the influence of the stress and the cost of a switching tube device, so that a large number of test experiments of the power electronic transformer modules are needed in actual production.
When the power electronic transformer module is subjected to full-power test, the traditional test system and method not only need a high-capacity power supply to provide power, but also need to be configured with a high-capacity direct-current load, so that the test system is high in cost and serious in electric energy waste. Therefore, patent document CN107966626a proposes a system for testing power by two modules in a push-to-push manner, which can test the forward and reverse power operation conditions of the modules and reduce the waste of electric energy. However, further researches find that in the power loop of the method, from power input to power output, an energy path continuously passes through four energy conversion modules, and a tandem system has a certain closed loop stability problem and needs to be improved in the aspect of system operation efficiency.
Disclosure of Invention
The invention aims to: in order to solve the problems of low stability, low operation efficiency and the like in the prior art, the invention provides an operation test circuit of a power electronic transformer module and a starting method thereof.
The technical scheme is as follows: the invention provides an operation test circuit of a power electronic transformer module, which comprises a first conversion module, a second conversion module, a third conversion module, a fourth conversion module, a first adapter circuit and a second adapter circuit, wherein the first conversion module, the second conversion module, the third conversion module and the fourth conversion module are cascaded; the output ends of the first conversion module and the third conversion module are respectively connected with the input ends of the second conversion module and the fourth conversion module; the input ends of the second conversion module and the fourth conversion module are connected with a direct current power supply; the input end of the first conversion module is connected with the input end of the third conversion module through a first adapting circuit; the output end of the second conversion module is connected with the output end of the fourth conversion module through a second adapting circuit.
Further, the first adapting circuit is a direct-direct conversion circuit or an alternating-direct conversion circuit; the second adapting circuit is a direct-direct conversion circuit; the first conversion module and the third conversion module have the same structure and are a full-bridge circuit or a half-bridge circuit; the second conversion module and the fourth conversion module are isolated double-H-bridge circuits, and the isolated double-H-bridge circuits comprise double active bridge circuits and isolated LC resonance circuits or isolated CLLC resonance circuits; when the first conversion module and the third conversion module are half-bridge circuits, the first adaptation circuit is a direct-direct conversion circuit.
Further, when the first adapting circuit is a direct-direct conversion circuit, the input ports of the first and third conversion modules are direct-current input ends; the first adapting circuit is a direct-direct conversion circuit, and includes: a first port and a second port; the first port includes: corresponding first and second terminals, the second port comprising: corresponding third and fourth terminals; the first and third terminals are located; the two corresponding terminals of the first port are connected through a disconnecting switch branch, and the two corresponding terminals of the second port are also connected through a disconnecting switch branch; or at least one port, two corresponding terminals of the port are connected with a circuit connected with the isolating switch branch in series through a resistor or a resistor; the first terminal and the third terminal are connected with the input end of the first conversion module; the second terminal and the fourth terminal are connected with the input end of the third conversion module; the isolating switch branch comprises an isolating switch or a direct current wire.
Further, when the first adapting circuit is a direct-direct conversion circuit, the first adapting circuit further comprises two input ports connected with a direct-current power supply; in the first port and the second port, if two corresponding terminals of one port are connected through a disconnecting switch branch, any one end of the disconnecting switch branch is used as an input port of the first adapting circuit; if two corresponding terminals of one port are connected in series through a circuit formed by two resistors connected in series or a circuit formed by connecting two resistors in series with the isolating switch branch circuit; the junction of the two resistors is used as an input port for the first adaptation circuit.
Further, when the first adapting circuit is an ac-dc converting circuit, the input ports of the first converting module and the third converting module are ac input ends; the first adapting circuit is an ac-dc converting circuit, and includes: third, four ports; the third port includes: respective fifth and sixth terminals, the fourth terminal comprising: a corresponding seventh and eighth terminal; at least one of the third port and the fourth port is connected with a circuit which is connected with the isolating switch branch in series through an inductor or an inductor between two corresponding terminals of the port; if only two corresponding terminals of one of the two ports are connected with the isolating switch branch in series by adopting an inductor or a circuit of the inductor and the isolating switch branch, the two corresponding terminals of the other port are connected with each other through the isolating switch branch; the fifth terminal and the seventh terminal are connected with the input end of the first conversion module; the sixth terminal and the eighth terminal are connected with the input end of the third conversion module; the isolating switch branch comprises an isolating switch or a direct current wire.
Further, when the first adapting circuit is an ac-dc converting circuit, the first adapting circuit further comprises two input ends connected with an ac power supply, and in the third and fourth ports, if two corresponding terminals of a certain port are connected through a disconnecting switch branch, any one end of the disconnecting switch branch is used as one input end of the first adapting circuit; if two corresponding terminals of one port are connected in series through a circuit formed by two series inductors or a circuit formed by connecting two inductors in series and then connecting the two inductors with an isolating switch branch circuit; the junction of the two inductances is used as an input of the first adaptation circuit.
Further, the second power distribution circuit includes: fifth and sixth ports; the fifth port includes: respective ninth and tenth terminals, the sixth port comprising: a corresponding eleventh and twelfth terminal; the two corresponding terminals of the fifth port are connected through a disconnecting switch branch, and the two corresponding terminals of the sixth port are also connected through a disconnecting switch branch; or at least one port, two corresponding terminals of the port are connected with a circuit connected with the isolating switch branch in series through a resistor or a resistor; the ninth terminal and the eleventh terminal are connected with the input end of the first conversion module; the tenth and twelfth terminals are connected with the input end of the third conversion module; the isolating switch branch comprises an isolating switch or a direct current wire.
Further, the second circuit further includes two input ends connected to the dc power supply, and in the fifth and sixth ports, if two corresponding terminals of a certain port are connected through the isolating switch branch, any one end of the isolating switch branch is used as an input end of the second adapting circuit; if two corresponding terminals of one port are connected in series through a circuit formed by two resistors connected in series or a circuit formed by connecting two resistors in series with the isolating switch branch circuit; the junction of the two resistors is used as an input to the second adaptation circuit.
A method for starting an operation test circuit of a power electronic transformer module, the method comprising a voltage starting method or a power starting method:
the voltage starting method specifically comprises the following steps:
step 1: unlocking the first transformation module and the second transformation module;
step 2: unlocking the fourth conversion module and enabling the direct-current voltages of the direct-current output ends of the fourth conversion module and the second conversion module to be equal;
step 3: sampling the voltage phase of the input end of the first conversion module, tracking the phase by the third conversion module, and unlocking the third conversion module if the tracked output phase is the same as the voltage phase of the alternating current input end of the first conversion module;
step 4: if the first adapting circuit or the second adapting circuit is provided with isolating switches, closing all isolating switches and turning back to the step 5; otherwise, directly turning to the step 5;
Step 5: gradually increasing or decreasing the direct-current voltage amplitude of the direct-current output end of the second conversion module, so that the power between the second conversion module and the fourth conversion module reaches rated power; gradually increasing or decreasing the alternating voltage phase of the alternating current input end of the first conversion module, so that the power between the first conversion module and the third conversion module reaches rated power;
Step 6: after the operation test circuit is started and operated normally, performing performance test on the operation test circuit;
The power starting method specifically comprises the following steps:
S1: unlocking the first transformation module and the second transformation module;
S2: if the first adapting circuit or the second adapting circuit is provided with isolating switches, closing all isolating switches and turning to S3; otherwise, directly turning to S3;
s3: unlocking the fourth conversion module and controlling the reference power of the fourth conversion module to be 0;
S4: sampling the voltage phase of the input end of the first conversion module, tracking the phase by the third conversion module, unlocking the third conversion module if the tracked output phase is the same as the voltage phase of the input end of the first conversion module, and controlling the reference power of the third conversion module to be 0;
S5: gradually increasing or decreasing the reference power of the fourth conversion module so that the power between the second conversion module and the fourth conversion module reaches the rated power; gradually increasing or decreasing the reference power of the third conversion module so that the power between the first conversion module and the third conversion module reaches the rated power;
s6: and after the operation test circuit is started to operate normally, performing performance test on the operation test circuit.
The beneficial effects are that:
(1) Compared with the traditional experimental scheme of the power electronic transformer module, the scheme of the application can effectively reduce the electric energy waste and reduce the power supply requirement of system test.
(2) Compared with the prior patent scheme, the scheme of the application can decouple the system power operation loop and improve the system stability.
(3) Compared with the prior patent scheme, the two power operation loops of the scheme of the application are operated in parallel in structure, and the system operation efficiency can be further improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of a two-port first adapter circuit configuration;
FIG. 3 is a schematic diagram of a three-port first adapter circuit configuration;
FIG. 4 is a schematic diagram of a two-port second adapter circuit configuration;
FIG. 5 is a schematic diagram of a three-port second adapter circuit configuration;
FIG. 6 is a diagram of a four-switch full-bridge circuit configuration;
FIG. 7 is a schematic diagram of a conventional dual active bridge circuit;
FIG. 8 is a schematic diagram of an isolated CLLC circuit;
FIG. 9 is a circuit diagram of a power electronic transformer module with two full bridges respectively cascading two dual active bridge circuits;
FIG. 10 is a circuit diagram of a power electronic transformer module of a full-bridge cascaded dual active bridge circuit and a full-bridge cascaded isolated CLLC resonant circuit;
FIG. 11 is a circuit diagram of a power electronic transformer module with two half-bridges respectively cascading two dual-active bridge circuits;
FIG. 12 is a circuit diagram of a power electronic transformer module with two full bridges respectively cascading two dual active bridge circuits and a first adapter circuit being a three-port circuit;
FIG. 13 is a circuit diagram of a power electronic transformer module with two full bridges respectively cascading two dual active bridge circuits and a second adapter circuit having an isolation switch;
fig. 14 is a schematic diagram of a power electronic transformer with in-series output and parallel connection.
Description of the drawings: 101: first transformation module, 102: second transformation module, 201: third transformation module, 202: fourth transformation module, 40: first adaptation circuit, 50: second adaptation circuit, 30: a DC power supply.
Detailed Description
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
As shown in fig. 1, the present invention provides an operation test circuit of a power electronic transformer module, a first power electronic transformer module, a second power electronic transformer module, a first adapting circuit 40, a second adapting circuit 50; the first power electronic transformer module comprises a first conversion module 101 and a second conversion module 102 which are cascaded; the second power electronic transformer module comprises third and fourth cascaded conversion modules 201 and 202; the output ends of the first conversion module and the third conversion module are respectively connected with the input ends of the second conversion module and the fourth conversion module; the input ends of the second conversion module and the fourth conversion module are connected with a direct current power supply 30; the input end of the first conversion module is connected with the input end of the third conversion module through a first adapting circuit; the output end of the second conversion module is connected with the output end of the fourth conversion module through a second adapting circuit:
The first adapting circuit is a two-port circuit and is a direct-direct conversion circuit; the input ends of the first conversion module and the third conversion module are alternating current input ends; the two ports of the first adapting circuit are connected through the isolating switch branch, or at least one port is arranged, and the two corresponding terminals of the port are connected with the circuit connected in series with the isolating switch branch through a resistor or a resistor; the isolating switch branch comprises an isolating switch or a direct current wire;
When the first adapting circuit is a three-port circuit and is a direct-direct conversion circuit, the input ends of the first conversion module and the third conversion module are alternating current input ends; the two output ports of the first adapting circuit are connected through the isolating switch branch, or at least one port is arranged, and two corresponding terminals of the port are connected with a circuit connected in series with the isolating switch branch through a resistor or a resistor;
As shown in fig. 2, when the first adapting circuit is a two-port circuit and is an ac-dc converting circuit, the input ports of the first converting module and the third converting module are ac input ports, at least one port is arranged on both ports of the first adapting circuit, and two corresponding terminals of the ports are connected with a circuit connected in series with the isolating switch branch circuit through an inductor or an inductor; if only two corresponding terminals of one of the two ports are connected with the isolating switch branch in series by adopting an inductor or a circuit of the inductor and the isolating switch branch, the two corresponding terminals of the other port are connected with each other through the isolating switch branch;
As shown in fig. 3, when the first adapting circuit is a three-port circuit and is an ac-dc converting circuit, the input ports of the first and third converting modules are ac input ports; at least one of the two output ports of the first adapting circuit is provided with two corresponding terminals of the port, and the two corresponding terminals of the port are connected with a circuit connected in series with the isolating switch branch circuit through an inductor or an inductor; only two corresponding terminals of one of the two ports are connected with a circuit which is connected in series with the isolating switch branch by adopting an inductor or an inductor, and then the two corresponding terminals of the other port are connected with each other through the isolating switch branch;
as shown in fig. 4, the second adapting circuit is a two-port circuit; the two ports of the second adapting circuit are connected through the isolating switch branch, or at least one port is arranged, and the two corresponding terminals of the port are connected with the circuit connected in series with the isolating switch branch through a resistor or a resistor;
As shown in fig. 5, the second adapting circuit is a three-port circuit: the two ports of the second adapting circuit are connected through the isolating switch branch, or at least one port is arranged, and the two corresponding terminals of the port are connected with the circuit connected in series with the isolating switch branch through a resistor or a resistor;
the first conversion module and the third conversion module have the same structure as a full-bridge circuit or a half-bridge circuit; the second conversion module and the fourth conversion module are isolated double-H-bridge circuits, and the isolated double-H-bridge circuits comprise double active bridge circuits and isolated LC resonance circuits or double active bridge circuits and isolated CLLC resonance circuits; when the first conversion module and the third conversion module are half-bridge circuits, the first conversion module and the third conversion module are connected through a direct-direct conversion circuit. A full-bridge circuit schematic is shown in fig. 6; FIG. 7 is a schematic diagram of a dual active bridge circuit; FIG. 8 is a schematic diagram of an isolated CLLC resonant circuit;
to illustrate the method of starting the above-described run test circuit;
The method comprises the following steps: as shown in fig. 9, the circuit structure is shown in the figure, wherein two power electronic transformer modules of a full-bridge cascaded double-active bridge circuit are adopted, L g is a reactor of a first adaptive circuit, and R L is a resistor of a second adaptive circuit; during the experiment, the method is started and operated as follows:
step 1: unlocking the full-bridge circuit and the double-active-bridge circuit of the second power electronic transformer module;
step 2: unlocking the double active bridge circuits of the second power electronic transformer module to equalize the direct current voltages of the output ports (output ends of the double active bridge circuits) of the two modules;
step 3: sampling the voltage phase of an input port (input end of a full-bridge circuit) of a first power electronic transformer module, and tracking the phase to unlock the full-bridge circuit of a second power electronic transformer module;
step 4: when the first adapting circuit and the second adapting circuit comprise isolating switches, all isolating switches are closed, and the isolating switches are not arranged in the circuit in fig. 9, and the step is skipped;
Step 5: gradually increasing/decreasing the direct-current voltage amplitude of the output port of the first power electronic transformer module, so that the power between the double active bridge circuits of the two modules is gradually increased to rated power;
Step 6: the alternating voltage phase of the input port of the first power electronic transformer module is gradually increased/decreased, so that the power between the full-bridge circuits of the two modules is gradually increased to rated power.
The method is not limited to the circuit structure of fig. 9
The method comprises the following steps: as shown in fig. 10, the experimental circuit structure is shown, wherein a full-bridge cascading dual-active bridge circuit and a power electronic transformer module of a full-bridge cascading isolation type CLLC resonant circuit are adopted in the diagram, the full-bridge cascading isolation type CLLC resonant circuit is a first power electronic transformer module, the full-bridge cascading dual-active bridge circuit is a second power electronic transformer module, L g is a reactor of a first adapting circuit, and K0 is an isolating switch of a second adapting circuit; during the experiment, the method can be started and operated as follows:
Step 1: unlocking the full-bridge circuit and the double-active-bridge circuit of the first power electronic transformer module;
step2: when the first adapting circuit and the second adapting circuit comprise isolating switches, all isolating switches are closed; closing the K0 isolation switch;
step 3: unlocking the double active bridge circuits of the second power electronic transformer module, and controlling the power reference of the double active bridge circuits to be 0;
Step 4: sampling the voltage phase of an input port of a first power electronic transformer module, tracking the phase to unlock a full-bridge circuit of a second power electronic transformer module, and controlling the power reference of the full-bridge circuit to be 0;
step 5: gradually increasing/decreasing the power reference of the double active bridge circuits of the second power electronic transformer module, so that the power between the double active bridge circuits of the two modules is gradually increased to rated power;
Step 6: gradually increasing/decreasing the power reference of the full-bridge circuit of the second power electronic transformer module to gradually increase the power between the full-bridge circuits of the two modules to rated power;
The method is not limited to the circuit structure of FIG. 10
As shown in fig. 11, a power electronic transformer module adopting two half-bridge cascaded double-active-bridge circuits is shown, and a method one can be referred to for starting and operating modes of the double-active-bridge circuits; the half-bridge circuit outputs direct current, so the first adapting circuit is of a series resistance structure, and the starting and running modes can refer to a first method.
As shown in fig. 12, the experimental circuit structure adopts a power electronic transformer module of two full-bridge cascaded double-active-bridge circuits, and the starting and running modes of the double-active-bridge circuits can refer to a first method; the output of the two full-bridge circuits is respectively connected with an inductor and then connected with an alternating current power grid, so that the operating power of the full-bridge circuits and the power grid of the two power electronic transformer modules can be adjusted by adjusting the voltage phases of the two power electronic transformer modules during starting.
As shown in fig. 13, the experimental circuit structure is shown, in which two power electronic transformer modules of a full-bridge cascade dual-active bridge circuit are adopted, and the starting and running modes of the full-bridge circuit can refer to a first method; after the output of the two double-active-bridge circuits is respectively connected with a switch and then is connected with a second direct-current power supply, when the power electronic transformer is started, the two double-active-bridge circuits are firstly unlocked, the voltages of the second ports of the corresponding power electronic transformer modules are regulated to be equal, and then the isolating switches K1 and K2 are combined, so that the running power of the two double-active-bridge circuits of the two power electronic transformer modules and the running power of the second direct-current power supply can be regulated.
The start-up and operation test process of the power electronic transformer module can be completed according to the patent.
As shown in fig. 14, the power electronic transformer module with the completed operation experiment can be formed into a power electronic transformer (ISOP) by adopting an input series-output parallel connection mode, and can be formed into a system with an input series-output series connection and an input parallel-output parallel connection for practical engineering; and the third ports of all the power electronic transformer modules are suspended.
It will be understood that equivalents and modifications will occur to those skilled in the art in light of the present invention and their spirit, and all such modifications and substitutions are intended to be included within the scope of the present invention as defined in the following claims.
Claims (6)
1. A starting method of an operation test circuit of a power electronic transformer module comprises a first conversion module, a second conversion module, a first adapting circuit and a second adapting circuit; the output end of the first conversion module is connected with the input end of the second conversion module, and the output end of the third conversion module is connected with the input end of the fourth conversion module; the input ends of the second conversion module and the fourth conversion module are connected with a direct current power supply; the input end of the first conversion module is connected with the input end of the third conversion module through a first adapting circuit; the output end of the second conversion module is connected with the output end of the fourth conversion module through a second adapting circuit; the first adapting circuit is a direct-direct conversion circuit or an alternating-direct conversion circuit; the second adapting circuit is a direct-direct conversion circuit; the first conversion module and the third conversion module have the same structure and are a full-bridge circuit or a half-bridge circuit; the second conversion module and the fourth conversion module are isolated double-H-bridge circuits, and the isolated double-H-bridge circuits comprise double active bridge circuits and isolated LC resonance circuits or isolated CLLC resonance circuits; when the first conversion module and the third conversion module are half-bridge circuits, the first adaptation circuit is a direct-direct conversion circuit; when the first adapting circuit is a direct-direct conversion circuit, the input ports of the first conversion module and the third conversion module are direct-current input ends; the first adapting circuit is a direct-direct conversion circuit, and includes: a first port and a second port; the first port includes: corresponding first and second terminals, the second port comprising: corresponding third and fourth terminals; the two corresponding terminals of the first port are connected through a disconnecting switch branch, and the two corresponding terminals of the second port are also connected through a disconnecting switch branch; or at least one of the first port and the second port, and two corresponding terminals of the port are connected with a circuit connected in series with the isolating switch branch through a resistor or a resistor; the first terminal and the third terminal are connected with the input end of the first conversion module; the second terminal and the fourth terminal are connected with the input end of the third conversion module; the isolating switch branch comprises an isolating switch or a direct current wire, and is characterized in that the method comprises a voltage starting method or a power starting method:
the voltage starting method specifically comprises the following steps:
step 1: unlocking the first transformation module and the second transformation module;
step 2: unlocking the fourth conversion module and enabling the direct-current voltages of the direct-current output ends of the fourth conversion module and the second conversion module to be equal;
step 3: sampling the voltage phase of the input end of the first conversion module, tracking the phase by the third conversion module, and unlocking the third conversion module if the tracked output phase is the same as the voltage phase of the alternating current input end of the first conversion module;
step 4: if the first adapting circuit or the second adapting circuit is provided with isolating switches, closing all isolating switches and turning back to the step 5; otherwise, directly turning to the step 5;
Step 5: gradually increasing or decreasing the direct-current voltage amplitude of the direct-current output end of the second conversion module, so that the power between the second conversion module and the fourth conversion module reaches rated power; gradually increasing or decreasing the alternating voltage phase of the alternating current input end of the first conversion module, so that the power between the first conversion module and the third conversion module reaches rated power;
Step 6: after the operation test circuit is started and operated normally, performing performance test on the operation test circuit;
The power starting method specifically comprises the following steps:
S1: unlocking the first transformation module and the second transformation module;
S2: if the first adapting circuit or the second adapting circuit is provided with isolating switches, closing all isolating switches and turning to S3; otherwise, directly turning to S3;
s3: unlocking the fourth conversion module and controlling the reference power of the fourth conversion module to be 0;
S4: sampling the voltage phase of the input end of the first conversion module, tracking the phase by the third conversion module, unlocking the third conversion module if the tracked output phase is the same as the voltage phase of the input end of the first conversion module, and controlling the reference power of the third conversion module to be 0;
S5: gradually increasing or decreasing the reference power of the fourth conversion module so that the power between the second conversion module and the fourth conversion module reaches the rated power; gradually increasing or decreasing the reference power of the third conversion module so that the power between the first conversion module and the third conversion module reaches the rated power;
s6: and after the operation test circuit is started to operate normally, performing performance test on the operation test circuit.
2. The method for starting an operation test circuit of a power electronic transformer module according to claim 1, wherein when the first adapting circuit is a direct-direct conversion circuit, the first adapting circuit further comprises two input ports connected with a direct-current power supply; in the first port and the second port, if two corresponding terminals of one port are connected through a disconnecting switch branch, any one end of the disconnecting switch branch is used as an input port of the first adapting circuit; if two corresponding terminals of one port are connected in series through a circuit formed by two resistors connected in series or a circuit formed by connecting two resistors in series with the isolating switch branch, the connection part of the two resistors is used as an input port of the first adapting circuit.
3. The method for starting an operation test circuit of a power electronic transformer module according to claim 1, wherein when the first adapting circuit is an ac-dc converting circuit, the input ports of the first and third converting modules are ac input ends; the first adapting circuit is an ac-dc converting circuit, and includes: third, four ports; the third port includes: respective fifth and sixth terminals, the fourth terminal comprising: a corresponding seventh and eighth terminal; at least one of the third port and the fourth port is connected with a circuit which is connected with the isolating switch branch in series through an inductor or an inductor between two corresponding terminals of the port; if only two corresponding terminals of one of the two ports are connected with the isolating switch branch in series by adopting an inductor or a circuit of the inductor and the isolating switch branch, the two corresponding terminals of the other port are connected with each other through the isolating switch branch; the fifth terminal and the seventh terminal are connected with the input end of the first conversion module; the sixth terminal and the eighth terminal are connected with the input end of the third conversion module; the isolating switch branch comprises an isolating switch or a direct current wire.
4. A method for starting an operation test circuit of a power electronic transformer module according to claim 3, wherein when the first adapting circuit is an ac-dc converting circuit, the method further comprises two input ends connected with an ac power source, and in the third and fourth ports, if two corresponding terminals of a certain port are connected through a disconnecting switch branch, any one end of the disconnecting switch branch is used as one input end of the first adapting circuit; if two corresponding terminals of one port are connected in series through a circuit formed by two series inductors or a circuit formed by connecting two inductors in series and then connecting the two inductors with an isolating switch branch circuit; the junction of the two inductances is used as an input of the first adaptation circuit.
5. The method of starting an operation test circuit of a power electronic transformer module according to claim 1, wherein the second adapting circuit comprises: fifth and sixth ports; the fifth port includes: respective ninth and tenth terminals, the sixth port comprising: a corresponding eleventh and twelfth terminal; the two corresponding terminals of the fifth port are connected through a disconnecting switch branch, and the two corresponding terminals of the sixth port are also connected through a disconnecting switch branch; or at least one of the fifth port and the sixth port, wherein two corresponding terminals of the port are connected with a circuit connected in series with the isolating switch branch through a resistor or a resistor; the ninth terminal and the eleventh terminal are connected with the input end of the first conversion module; the tenth and twelfth terminals are connected with the input end of the third conversion module; the isolating switch branch comprises an isolating switch or a direct current wire.
6. The method according to claim 5, wherein the second adapting circuit further comprises two input terminals connected to a dc power supply, and wherein, in the fifth and sixth ports, if two corresponding terminals of a certain port are connected through a disconnecting switch branch, either end of the disconnecting switch branch is used as one input terminal of the second adapting circuit; if two corresponding terminals of one port are connected in series through a circuit formed by two resistors connected in series or a circuit formed by connecting two resistors in series with the isolating switch branch, the connection part of the two resistors is used as one input end of the second adapting circuit.
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