CN214409146U - Power module test platform - Google Patents
Power module test platform Download PDFInfo
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- CN214409146U CN214409146U CN202120000887.XU CN202120000887U CN214409146U CN 214409146 U CN214409146 U CN 214409146U CN 202120000887 U CN202120000887 U CN 202120000887U CN 214409146 U CN214409146 U CN 214409146U
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Abstract
The utility model discloses a to dragging formula power module test platform, include DC power supply, single-phase inductance, control system and power module under test, accompany and try one's things on the power module. The direct current power supply is used for providing adjustable direct current voltage for the tested power module and the accompanying test power module; the single-phase inductor is connected with the output ends of the two groups of power modules; the control system comprises a controller and a current and voltage sampling circuit. The two groups of power modules are adopted to be in a dragging mode, under the condition that the configuration of the middle inductor is fixed, the output voltage and the output current can be flexibly controlled, the absolute value of the power factors of the two groups of modules is higher, electric energy flows through the other power module from one power module, feedback is completed on the direct current side, and the input current of the direct current side is only a few amperes, so that the electric energy consumption is saved.
Description
Technical Field
The utility model belongs to the technical field of the power module test, a power module test platform is related to, specifically is a to dragging formula power module test platform.
Background
In a power module test, a resistance inductor or a pure resistor is generally used as a load, and the output voltage is controlled by adjusting a modulation ratio to output alternating current to meet test requirements. This method is well established, but has the disadvantage that mass production tests consume energy, and the regulation of the alternating current can only be achieved by regulating the output voltage after a fixed load is provided.
The towed test platform or method is commonly used in tests of motors, generator sets, prime movers and the like, wherein one of the towed test platforms or the towed test methods is used as an accompanying test device, and the other towed test platform or the towed test platforms is used as a tested device, or the towed test platforms and the towed test platforms or the towed test methods are mutually accompanying test devices. The tested equipment outputs rotating mechanical energy through the shafting, the rotating mechanical energy is dragged to the test accompanying equipment to rotate, the test accompanying equipment resists rotation, a contra-torsion is formed, and the rotating mechanical energy is converted into other energy or consumed. The opposite-dragging test method has the advantages that the accompanying test equipment can better simulate the actual working condition of the tested equipment, and meanwhile, the energy is saved.
Chinese utility model patent "a to dragging formula SVG module debugging platform" and CN108663592A utility model patent "a to dragging formula SVG module debugging platform and method" that bulletin number is CN208350911U states that two sets of SVG are on the primary side, the SVG module under test outputs the inductive reactive current to the ac side of power supply system and the corresponding accompanying test SVG module outputs the inductive reactive current with opposite direction such as amplitude to the ac side of power supply system, the mode that the SVG module in pairs drags to offset is adopted to reduce the current of flowing through of transformer in the power supply system, thereby effectively reduce the capacity of transformer, solve the great problem that leads to of the cost of the more SVG test transformer capacity demand.
Above-mentioned patent is connected in the friendship through two sets of SVG, to dragging compensation alternating current reactive power, has offset a set of SVG and has exported reactive power to the alternating current power supply system when experimental for alternating current input current reduces.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to providing a to dragging formula power module test platform, it can not only adjust output voltage and output current in a flexible way, has higher power factor, can also save the electric energy.
In order to achieve the above object, the utility model provides a technical scheme that its technical problem adopted is: a power module test platform comprises a direct-current common bus connected with a three-phase alternating-current power supply through a controllable rectifier module, and a supporting capacitor cabinet, a tested power module and an accompanying test power module which are connected to the direct-current common bus in parallel, wherein the direct-current common bus is used for providing adjustable direct-current voltage for the tested power module and the accompanying test power module; the output ends of the tested power module and the power module for accompanying test are connected with a single-phase inductor for filtering high-frequency voltage signals, bearing the difference value of the output voltages of the two groups of power modules after offset and generating alternating current output current; still include the control system who comprises current-voltage sampling circuit and controller for control power module's output voltage waveform and electric current, and realize the fault protection function, current-voltage sampling circuit be used for gathering power module's electric current and voltage, current-voltage sampling circuit and debugging platform are connected to the input of controller, and the output of controller is even received and is tried power module and accompany and try power module.
Furthermore, the output voltages of the tested power module and the power module under test are equal in magnitude and same in frequency, a phase difference exists, namely, the phase of the modulation wave is shifted, and the phase of the output voltage of the tested power module leads the phase of the output voltage of the power module under test.
Furthermore, the output phases of the tested power module and the power module under test are the same, and are single-phase, three-phase, multi-phase or a combination thereof; the bridge arm structure forms are the same and are half-bridge or full-bridge structures with at least one bridge arm, and the main power device is an IGBT, an IGCT or a thyristor; the tested power module and the auxiliary power module are of two-level, three-level or multi-level types.
Furthermore, the tested power module and the accompanying power module are both two-level H-bridge inverter power modules.
Still further, the single-phase inductor is provided with at least one independent winding and at least two connecting terminals, one connecting terminal of at least one winding of the single-phase inductor is connected with at least one bridge arm output end of the power module to be tested, the other connecting terminal of at least one winding of the single-phase inductor is connected with at least one bridge arm output end of the power module to be tested, and connecting terminals of other windings of the single-phase inductor are sequentially connected with the bridge arm output end of the power module to be tested and the bridge arm output end of the power module to be tested.
The utility model has the advantages that:
1, two groups of power modules are oppositely dragged through a single-phase inductor at an alternating current side in a mutual dragging mode, and are connected in parallel at a direct current side to realize electric energy feedback, so that electric energy consumption is saved;
2, the direct current power supply provides direct current voltage to supplement electric energy loss, and the input current is only a few amperes, so that the current requirement of the direct current power supply is reduced;
3, the two groups of power modules are connected by using a single-phase inductor to replace a pure resistance load or a resistance-inductance load required by a group of power module test, so that the volume and the weight of the load are reduced, and the cost is saved;
and 4, independently decoupling and adjusting the output voltage and the output current under the condition that the configuration of the single-phase inductor is fixed according to the requirement of the test working condition. After the configuration of the load is better than that of a pure resistance load or a resistance-inductance load and is fixed, the output current can meet the requirement of the test working condition only by adjusting the modulation ratio, wherein the output voltage cannot be independently adjusted;
5, the test device can be used for testing a single group of power modules and can also be used for testing two groups of power modules. When two sets of power modules are tested, the two sets of power modules are mutually tested, and the test efficiency is improved.
Drawings
Fig. 1 is a schematic diagram of a power module test platform according to the present invention;
fig. 2 is the utility model relates to a two-level H bridge inverter power module test platform schematic diagram.
The figures are numbered: the device comprises a three-phase alternating current power supply 1, a controllable rectifying module 2, a direct current common bus 3, a supporting capacitor cabinet 4, a tested power module 5, a test accompanying power module 6, a single-phase inductor 7, a controller 8 and a current and voltage sampling circuit 9.
Detailed Description
The technical solution of the present invention is further specifically described below with reference to the accompanying drawings and examples.
The first embodiment of the present invention is shown in fig. 1, which is a power module testing platform, comprising a dc common bus 3 connected to a three-phase ac power supply 1 through a controllable rectifier module 2, and a supporting capacitor cabinet 4, a tested power module 5 and an accompanying power module 6 connected in parallel to the dc common bus 3, wherein the dc common bus 3 is used for providing adjustable dc voltage to the tested power module 5 and the accompanying power module 6; the output ends of the tested power module 5 and the accompanying power module 6 are connected with a single-phase inductor 7 for filtering high-frequency voltage signals, bearing the difference value of the output voltages of the two groups of power modules after offset and generating alternating current output current; still include the control system who comprises current-voltage sampling circuit 9 and controller 8 for control power module's output voltage waveform and electric current, and realize the fault protection function, current-voltage sampling circuit 9 be used for gathering power module's electric current and voltage, current-voltage sampling circuit 9 and debugging platform are connected to controller 8's input, controller 8's output even receives examination power module 5 and accompany examination power module 6, and controller 8 is the intermediate node of examination power module 5 and accompanying examination power module 6, receives communication data such as power module's temperature, and transmits the debugging platform through the communication with the voltage electric current data of gathering together. The control system is also used for man-machine interaction, parameter setting, starting and stopping tests, emergency stop in emergency, observation of voltage, current, temperature and other real-time state data of the power module.
The utility model discloses a realize power module's experiment, adopt two sets of power module to the mode of dragging, under the fixed condition of middle inductance configuration, can control output voltage and output current in a flexible way, two sets of power module's power factor's absolute value is higher, and the electric energy flows through another power module from a power module, accomplishes the repayment in the direct current side, and direct current side input current is only several amperes to electric energy consumption has been saved. The three-phase alternating current power supply 1 outputs direct current voltage required by a power module test after passing through the controllable rectifier module 2 and the supporting capacitor cabinet 4, and direct current input ends of the tested power module 5 and the accompanying power module 6 are connected in parallel to an output end of the direct current power supply, so that a common bus for obtaining electric energy and feedback electric energy is provided, and electric energy loss is supplemented. The tested power module 5 obtains electric energy from the DC common bus 3, outputs AC voltage and AC current after inversion, has a positive power factor, outputs AC voltage and inflow AC current after rectification by the auxiliary test power module 6 through the single-phase inductor 7, has a negative power factor, and feeds back the electric energy to the DC side common bus through the auxiliary test power module 6.
The output voltages of the tested power module 5 and the accompanying power module 6 are equal in magnitude and same in frequency, a phase difference exists, namely, a modulation wave phase shift exists, and the phase of the output voltage of the tested power module 5 leads the phase of the output voltage of the accompanying power module 6.
Further, the tested power module 5 and the accompanying power module 6 have the same output phase number, and are single-phase, three-phase, multi-phase or a combination thereof; the bridge arm structure forms are the same and are half-bridge or full-bridge structures with at least one bridge arm, and the main power device is an IGBT, an IGCT or a thyristor; the power module under test 5 and the power module under test 6 are of two-level, three-level or multi-level type. The power modules include but are not limited to two-level, three-level, multi-level and other types according to the number of levels, and the number of the levels of the power module 5 to be tested and the power module 6 to be tested can be the same or different; the power module includes but is not limited to IGBT, IGCT, thyristor, etc. according to the main power device, the main power device of the power module under test 5 and the auxiliary power module 6 may be the same or different.
As a second embodiment, the power module under test 5 and the power module under test 6 are both two-level H-bridge inverter power modules. The single-phase inductor 7 is provided with at least one independent winding and at least two connecting terminals, one connecting terminal of at least one winding of the single-phase inductor 7 is connected with at least one bridge arm output end of the power module 5 to be tested, the other connecting terminal of at least one winding of the single-phase inductor 7 is connected with at least one bridge arm output end of the power module 6 to be tested, and connecting terminals of other windings of the single-phase inductor 7 are sequentially connected with the bridge arm output end of the power module 5 to be tested and the bridge arm output end of the power module 6 to be tested.
Taking a two-level H-bridge inverter power module as an example to introduce a test platform thereof, as shown in fig. 2, an H-bridge power module test platform comprises a direct-current power supply, a single-phase inductor 7, a control system, a tested H-bridge power module group, and a test-accompanying H-bridge power module group. The direct-current power supply comprises a three-phase alternating-current power supply 1 input, a controllable rectification and operation control unit thereof and a supporting capacitor, and is used for providing adjustable direct-current voltage for the tested H-bridge power module and the test-accompanying H-bridge power module; the single-phase inductor 7 is formed by combining two single-phase inductors 7 and is connected to the output ends of the two groups of H-bridge power modules; the control system comprises a controller 8 and a current and voltage sampling circuit 9.
The single-phase inductor 7 is a single-phase inductor 7 with two conjugated independent windings, or two independent single-phase inductors 7, and comprises four wiring terminals, wherein one winding of the single-phase inductor 7 is connected with the left bridge arm output end of the H-bridge power module to be tested and the left bridge arm output end of the H-bridge power module to be tested, and the other winding of the single-phase inductor 7 is connected with the right bridge arm output end of the H-bridge power module to be tested and the right bridge arm output end of the H-bridge power module to be tested. The single-phase inductor 7 filters high-frequency voltage signals, bears the difference value of the output voltages of the two groups of H-bridge power modules after offset, and generates alternating current.
The controller 8 of the control system is used for controlling the output voltage waveform and the current of the H bridge power module and realizing the fault protection function, the input end of the controller 8 is connected with the current and voltage sampling circuit 9 and the debugging platform, the output end of the controller 8 is connected with the H bridge power module to be tested and the H bridge power module to be tested, the controller 8 of the control system is used for man-machine interaction, parameters are set, the starting and stopping tests are carried out, the emergency stop is carried out under the emergency condition, the real-time state data such as the voltage, the current and the temperature of the H bridge power module are observed, and the current and the voltage of the H bridge power module are collected by the current and voltage sampling circuit 9 of the control system.
The controller 8 of the control system is communicated with the tested H-bridge power module and the accompanying tested H-bridge power module, and the controller 8 receives communication data such as the temperature of the H-bridge power module. And the controller 8 of the control system receives communication data such as parameters, control instructions and the like, converts the communication data into control data and outputs the control data to the H-bridge power module.
The tested H bridge power module obtains electric energy from the common bus at the direct current side, outputs alternating voltage and alternating current after inversion, the power factor is a positive value, the alternating voltage and the alternating current flow after rectification by the test-accompanying H bridge power module through the single-phase inductor 7 are output, the power factor is a negative value, and the test-accompanying H bridge power module feeds back the electric energy to the common bus at the direct current side.
The output voltage of the tested H-bridge power module is equal to the output voltage of the power module of the accompanying H-bridge, the frequency of the output voltage of the power module of the accompanying H-bridge is the same, and a phase difference exists. The phase difference is the modulation wave phase shift. The phase of the output voltage of the tested H-bridge power module leads the phase of the output voltage of the tested H-bridge power module.
The novel patent 'a double-drag type SVG module debugging platform' and the utility model patent 'a double-drag type SVG module debugging platform and method' are completely different from the H bridge power module test platform and method introduced in the text; the patent of the power module test method applied by the applicant on the same day connects two groups of H bridge power modules in parallel at the direct current input side, the alternating current output side connects the single-phase inductor 7, the cancellation alternating current output power is cancelled, the cancellation power is mainly active power and also contains reactive power, the feedback of electric energy is realized at the direct current side, the requirement of obtaining the electric energy from a power grid is reduced, and the energy consumption is reduced; the difference is also that the main circuit topology is different. A further difference is also the control pattern. The circuit topology and method introduced in the research on the large-power three-phase back-to-back converter valve drag experiment of journal thesis is completely different from the circuit topology and method introduced in the patent of a power module test method applied by the same applicant on the same day
The scope of the claims of the present invention is not limited to the embodiments described above. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.
Claims (5)
1. A power module test platform which is characterized in that: the device comprises a direct-current common bus (3) connected with a three-phase alternating-current power supply (1) through a controllable rectification module (2), and a supporting capacitor cabinet (4), a tested power module (5) and an accompanying and testing power module (6) which are connected to the direct-current common bus (3) in parallel, wherein the direct-current common bus (3) is used for providing adjustable direct-current voltage for the tested power module (5) and the accompanying and testing power module (6); the output ends of the tested power module (5) and the accompanying power module (6) are connected with a single-phase inductor (7) which is used for filtering high-frequency voltage signals, bearing the difference value of the output voltages of the two groups of power modules after offset and generating alternating current output current; still include the control system who constitutes by current-voltage sampling circuit (9) and controller (8), current-voltage sampling circuit (9) be used for gathering power module's electric current and voltage, current-voltage sampling circuit (9) are connected to the input of controller (8), and the output of controller (8) is even to be received and is tried power module (5) and accompany and try power module (6).
2. The power module test platform as claimed in claim 1, wherein the output voltages of the tested power module (5) and the power module under test (6) have the same magnitude and frequency, and are modulated wave phase-shifted, and the phase of the output voltage of the tested power module (5) is ahead of the phase of the output voltage of the power module under test (6).
3. The power module test platform according to claim 2, wherein the output phases of the tested power module (5) and the auxiliary test power module (6) are the same, and are single-phase, three-phase, multi-phase or a combination thereof; the power devices are half-bridge or full-bridge structures with at least one bridge arm, and the main power devices are IGBTs, IGCTs or thyristors; the tested power module (5) and the auxiliary power module (6) are of two-level, three-level or multi-level type.
4. A power module test platform according to claim 3, characterized in that the tested power module (5) and the accompanying power module (6) are both two-level H-bridge inverter power modules.
5. A power module test platform according to claim 4, characterized in that the single-phase inductor (7) has at least one independent winding and at least two terminals, one terminal of at least one winding of the single-phase inductor (7) is connected to at least one leg output terminal of the power module under test (5), the other terminal of at least one winding of the single-phase inductor (7) is connected to at least one leg output terminal of the power module under test (6), and terminals of the other windings of the single-phase inductor (7) are sequentially connected to the leg output terminal of the power module under test (5) and the leg output terminal of the power module under test (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120000887.XU CN214409146U (en) | 2021-01-03 | 2021-01-03 | Power module test platform |
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| CN202120000887.XU CN214409146U (en) | 2021-01-03 | 2021-01-03 | Power module test platform |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116068361A (en) * | 2023-04-04 | 2023-05-05 | 常州博瑞电力自动化设备有限公司 | Alternating current test system |
| CN116381395A (en) * | 2023-06-05 | 2023-07-04 | 北京市轨道交通运营管理有限公司 | Power converter valve group opposite-impact test platform and test method |
-
2021
- 2021-01-03 CN CN202120000887.XU patent/CN214409146U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116068361A (en) * | 2023-04-04 | 2023-05-05 | 常州博瑞电力自动化设备有限公司 | Alternating current test system |
| CN116068361B (en) * | 2023-04-04 | 2023-07-11 | 常州博瑞电力自动化设备有限公司 | Alternating current test system |
| CN116381395A (en) * | 2023-06-05 | 2023-07-04 | 北京市轨道交通运营管理有限公司 | Power converter valve group opposite-impact test platform and test method |
| CN116381395B (en) * | 2023-06-05 | 2023-08-01 | 北京市轨道交通运营管理有限公司 | Power converter valve group opposite-impact test platform and test method |
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