CN114113861A - Load current adjustable flexible straight half-bridge module short circuit test loop and test method - Google Patents
Load current adjustable flexible straight half-bridge module short circuit test loop and test method Download PDFInfo
- Publication number
- CN114113861A CN114113861A CN202111447449.9A CN202111447449A CN114113861A CN 114113861 A CN114113861 A CN 114113861A CN 202111447449 A CN202111447449 A CN 202111447449A CN 114113861 A CN114113861 A CN 114113861A
- Authority
- CN
- China
- Prior art keywords
- switch tube
- short
- current
- test
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
Abstract
The invention discloses a load current adjustable flexible-straight half-bridge module short circuit test loop and a test method, wherein the test loop comprises a main control system, a high-voltage direct current power supply, a pulse distribution plate and a load loop, and the main control system is connected with the high-voltage direct current power supply and the pulse distribution plate and provides logic control instructions for the high-voltage direct current power supply and the pulse distribution plate; the high-voltage direct-current power supply is connected with the power module and is used for charging the power module in a direct-current manner; the pulse distribution board is connected with a driver of a switch tube T1 of the power module, a driver of a switch tube T2 and a driver of a switch tube Ts of the load circuit, and provides on/off instructions for the three switch tubes. On the premise of not changing the structure of the half-bridge power module, the power module can be guaranteed to reach the operating temperature, the power module can be guaranteed to reach the operating current value, and the short circuit test of the power module is completed.
Description
Technical Field
The invention belongs to the technical field of short circuit tests of flexible-straight half-bridge modules, and particularly relates to a load current adjustable flexible-straight half-bridge module short circuit test loop and a test method.
Background
The modular multilevel converter based HVDC (modular multilevel converter based HVDC, MMC-HVDC) technology is a novel voltage source converter direct current transmission technology, has the unique advantages of high modularization degree, easiness in expansion, low loss, low switching frequency, small output voltage harmonic distortion, simple structure and the like, and is widely adopted and applied in the fields of new energy grid connection, island power supply, asynchronous networking, multi-terminal direct current transmission, urban power distribution network capacity increase and the like.
The reliability of the power module, which is a basic unit of the MMC converter valve, also becomes one of the key factors affecting the safe and reliable operation of the MMC, so it is necessary to detect various functions and performances of the power module, and it is important to effectively evaluate the severe short-circuit tolerance and driving protection capability of the power module.
The traditional short-circuit test method adopts an external short-circuit low-inductance inductor to turn on a tested switch to form a direct short circuit of capacitor discharge to verify the short-circuit capability, and the method is carried out under the condition that the tested switch has no initial current and no operating temperature, and only can verify the actual no-load working condition of the system. For flexible and direct power transmission engineering, the power module is mostly operated under load in practice, the power module has operating current and operating temperature working conditions in the process, and the traditional test method cannot meet the requirements of the actual engineering.
Therefore, a power module short circuit test method needs to be designed by combining the actual operation condition of the flexible direct current converter valve so as to solve the problems.
Disclosure of Invention
The invention provides a load current adjustable flexible straight half-bridge module short-circuit test loop and a test method, which enable a power module to reach an operation current value and complete a short-circuit test of a half-bridge power module.
In order to achieve the purpose, the load current adjustable flexible-straight half-bridge module short circuit test loop comprises a main control system, a high-voltage direct current power supply, a pulse distribution plate and a load loop, wherein the main control system is connected with the high-voltage direct current power supply and the pulse distribution plate and provides logic control instructions for the high-voltage direct current power supply and the pulse distribution plate; the high-voltage direct-current power supply is connected with the power module and is used for charging the power module in a direct-current manner; the pulse distribution board is connected with a driver of a switch tube T1 of the power module, a driver of a switch tube T2 and a driver of a switch tube Ts of the load circuit, and provides on/off instructions for the switch tube T1, the switch tube T2 and the switch tube Ts.
Further, the heating system is further included, and the heating system is connected with the switch tube T1 and the switch tube T2 radiator interface of the power module.
Furthermore, the heating system adopts an internal circulation and liquid cooling heating mode.
Further, the load loop comprises a load inductor Ls and a switching tube Ts which are connected in series, and a diode Ds is connected in anti-parallel to the switching tube Ts.
Further, the high-voltage direct-current power supply outputs the highest voltage of 6000V.
The short circuit test method of the flexible straight half-bridge module based on the short circuit test loop comprises the following steps:
step 1, setting test parameters: testing temperature, test voltage and load current;
step 2, starting the heating system until the heating temperature reaches the testing temperature and keeps unchanged;
step 3, starting the high-voltage direct-current power supply, detecting that the capacitor voltage of the power module reaches a test voltage, and closing the high-voltage direct-current power supply after the voltage is stable;
step 4, issuing control instructions of the switch tube T1 to be tested and the switch tube Ts of the load circuit through a pulse distribution board, turning off after T1 is turned on for a time ta, and turning off after the Ts is turned on for a time tb;
step 5, detecting whether the load current reaches the set load current:
if I Is larger than or equal to Is, issuing a control instruction of the switch tube T2 to be tested through a pulse distribution board, starting a short-circuit test, and turning off the switch tube T2 after the switch tube T2 Is turned on for tc;
if the I Is less than the Is within the time of ta + 10%, judging that the test Is abnormal, and ending the test;
in the short-circuit test process, detecting the capacitance voltage, the running current, the short-circuit current and the short-circuit time data of the power module;
and 6, recording and storing test data.
Further, the on-time tc of the switching tube T2 is greater than the IGBT driver short-circuit protection time value tsc.
Further, the on-time tc of the switching tube T2 is tsc +20 us.
Compared with the prior art, the invention has at least the following beneficial technical effects:
on the premise of not changing the structure of the half-bridge power module, the invention not only can ensure that the power module reaches the operating temperature, but also adds a load loop to the switch to be tested, opens the switch tube Ts and the switch tube T1 to be tested before the test, forms the current required by the test on the load loop through the load inductor Ls, and ensures that the power module reaches the operating current value by controlling the conduction time of the switch tube Ts and the switch tube T1 to be tested. And under the condition that the operating temperature and the operating current meet the requirements, completing the opening of the upper pipe and the lower pipe of the power module to form a direct short circuit test. The test loop is simple and easy to operate, the operation temperature value, the operation current value and the test voltage value are flexibly adjusted, the short circuit tolerance and the driving protection capability of the equipment are comprehensively tested, a basic guarantee is provided for the operation of the flexible-direct power module, and the reliability of the flexible-direct product is improved.
Furthermore, the pulse distribution board is communicated with the driver through optical signals and connected through optical fibers, so that the anti-electromagnetic interference capability of the control command is improved.
The method provided by the invention has the advantages that the power module is heated, charged at high voltage, and forms the full-flow sequential control logic of the running current and the direct short circuit, different test working conditions can be flexibly adjusted, key parameters such as the temperature value of the power module, the voltage value of the capacitor, the on/off feedback signal and the running current value of the switching tube are collected in real time in the test process to judge, full-automatic closed-loop control of each link is realized, and the method has the advantages of high test efficiency, full-automatic operation, automatic judgment and data generation.
Further, the on-time tc of the switching tube T2 is greater than the short-circuit protection time value tsc of the IGBT driver, so that it is ensured that the driver detects the short-circuit and then the protection is turned off, instead of the main control system.
Drawings
FIG. 1 is a schematic diagram of a short circuit test loop;
FIG. 2 is a flow chart of a short circuit test method.
Detailed Description
In order to make the objects and technical solutions of the present invention clearer and easier to understand. The present invention will be described in further detail with reference to the following drawings and examples, wherein the specific examples are provided for illustrative purposes only and are not intended to limit the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, a load current adjustable short circuit test loop for a flexible-straight half-bridge module comprises a main control system, a heating system, a high-voltage direct-current power supply, a pulse distribution board and a load loop.
As shown in fig. 1, the flexible-direct-current half-bridge power module is a power sub-module for a flexible-direct-current transmission converter valve, and includes a switching tube T1, a switching tube T2, a diode D1 connected in inverse parallel to the switching tube T1, a diode D2 connected in inverse parallel to the switching tube T2, a capacitor C, a discharge resistor R, and a bypass switch S, where the switching tube T1 is connected in series with the switching tube T2, the series connection point is a positive output end of the flexible-direct-current half-bridge power module, and a negative electrode of the capacitor C is a negative output end.
The main control system adopts a high-performance DSP with a main frequency of 1.25GHz and a high-capacity FPGA to realize a control algorithm and a logic protection function, is connected with the heating system, the high-voltage direct-current power supply and the pulse distribution board, provides logic control instructions for the heating system, the high-voltage direct-current power supply and the pulse distribution board, and is logically developed according to a power module heating → high-voltage charging → running current → short-circuit test. The heating system and the high-voltage direct-current power supply are subjected to closed-loop control by acquiring a temperature value of the power module and a voltage value of the capacitor; and judging whether the test conditions are met or not in real time by acquiring the on/off feedback signals and the running current value of the switching tube, and carrying out closed-loop control on the pulse distribution plate. And (4) reporting the fault and performing shutdown protection on the abnormal condition in each logic test process.
The heating system is connected with the switch tube T1 and the switch tube T2 radiator interfaces of the power module and is used for heating the power module to reach the operating temperature, and the highest temperature can reach 130 ℃; the heating system adopts an internal circulation and liquid cooling heating mode to provide continuous and stable circulating liquid with the temperature, pressure and flow meeting the requirements, the power of the heating system is 380V, the power is 10kW, the conductivity of a liquid cooling medium is less than or equal to 0.3 mu s/cm, and the highest temperature of 130 ℃ can be heated. The high-voltage direct-current power supply is connected with a capacitor C of the power module in parallel and used for charging the power module in a direct-current mode, the power supply voltage of the high-voltage direct-current power supply is 380V, the power is 6kW, and the highest voltage is output to be 6000V. The pulse distribution board is connected with a driver of a switch tube T1 and a driver of a switch tube T2 of the power module and a driver of a switch tube Ts of the load circuit, and provides on/off instructions for the switch tube T1, the switch tube T2 and the switch tube Ts; the pulse distribution board is communicated with the driver by optical signals and is connected with the driver by optical fibers; the load loop comprises a load inductor Ls, a switching tube Ts and a diode Ds which is connected with the switching tube Ts in an anti-parallel mode and is connected with the positive and negative output ends of the power module in parallel, and a loop is provided for the running current of the power module.
Referring to fig. 2, the short circuit test method of the flexible-straight half-bridge module with adjustable load current comprises the following steps:
step 1, the tester transacts the power-on operation ticket, supplies power to the half-bridge module short-circuit test loop, and ensures that the main control system, the high-voltage direct-current power supply and the heating system are normally electrified.
Step 2, setting test parameters in the main control system: and testing the temperature Tam, the test voltage Us and the load current Is, and storing the setting parameters.
And 3, starting the test, and calculating the conduction time tx-L-Is/Us of the switching tube, the conduction time ta of the switching tube T1 and the conduction time tb of the switching tube Ts by the main control system according to the test requirement, wherein the ta-tb-tx +100 Us.
And 4, starting the heating system by the main control system, detecting that the heating temperature reaches the test temperature Tam, and keeping the temperature stable until the test is finished.
And 5, starting the high-voltage direct-current power supply by the main control system, detecting that the capacitor voltage of the power module reaches the test voltage Us, and closing the high-voltage direct-current power supply after the voltage is stable.
And 6, the main control system issues control instructions of the switch tube T1 to be tested and the switch tube Ts of the load circuit through a pulse distribution board, the switch tube T1 is turned off after the switch tube T1 is turned on for a time ta, and the switch tube Ts is turned off after the switch tube Ts is turned on for a time tb.
Step 7, the main control system detects whether the actual load current I reaches the set load current Is or not,
if I Is larger than or equal to Is, a control command of the tested switching tube T2 Is issued through a pulse distribution board, a short-circuit test Is started, the tested switching tube T2 Is turned off after the on time tc Is reached, the on time tc Is larger than the short-circuit protection time value tsc of the IGBT driver by 20us + T, and the protection Is turned off after the driver detects the short circuit, but the driver Is not turned off by the main control system.
And if I Is less than Is within the time of ta + 10%, judging that the test Is abnormal, ending the test, and checking the flexible-straight half-bridge module of the test.
And in the short-circuit test process, the data of the capacitor voltage, the running current, the short-circuit current and the short-circuit time of the power module are detected.
And 8, synchronously receiving state information of the power module by the main control system according to the parameters set in the step 2 for displaying and recording, wherein the state information comprises the running state of the power module, the voltage value of the capacitor, the state of a driving plate of the switch tube T1 and the state of the driving plate of the switch tube T2.
And 9, finishing the short circuit test, closing the heating system by the main control system, and automatically storing the test data obtained in the step 7.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (8)
1. The load current adjustable flexible straight half-bridge module short circuit test loop is characterized by comprising a main control system, a high-voltage direct current power supply, a pulse distribution plate and a load loop, wherein the main control system is connected with the high-voltage direct current power supply and the pulse distribution plate and provides logic control instructions for the high-voltage direct current power supply and the pulse distribution plate;
the high-voltage direct-current power supply is connected with the power module and is used for charging the power module in a direct-current manner;
the pulse distribution board is connected with a driver of a switch tube T1 of the power module, a driver of a switch tube T2 and a driver of a switch tube Ts of the load circuit, and provides on/off instructions for the switch tube T1, the switch tube T2 and the switch tube Ts.
2. The load current adjustable short circuit test loop of flexible-straight half-bridge module as claimed in claim 1, further comprising a heating system interfacing with the T1 and T2 heat sinks of the power module.
3. The short circuit test loop of flexible-straight half-bridge module with adjustable load current according to claim 2, wherein the heating system adopts an internal circulation and liquid cooling heating mode.
4. The short-circuit test loop of a flexible straight half-bridge module with adjustable load current according to claim 1, wherein the load loop comprises a load inductor Ls and a switching tube Ts connected in series, and the switching tube Ts is connected with an anti-parallel diode Ds.
5. The short-circuit test loop of flexible-straight half-bridge module with adjustable load current according to claim 1, wherein the high-voltage DC power supply outputs a maximum voltage of 6000V.
6. The short circuit test method of the flexible straight half-bridge module based on the short circuit test loop of claim 1, characterized by comprising the following steps:
step 1, setting test parameters: testing temperature, test voltage and load current;
step 2, starting the heating system until the heating temperature reaches the testing temperature and keeps unchanged;
step 3, starting the high-voltage direct-current power supply, detecting that the capacitor voltage of the power module reaches a test voltage, and closing the high-voltage direct-current power supply after the voltage is stable;
step 4, issuing control instructions of the switch tube T1 to be tested and the switch tube Ts of the load circuit through a pulse distribution board, turning off after T1 is turned on for a time ta, and turning off after the Ts is turned on for a time tb;
step 5, detecting whether the load current reaches the set load current:
if I Is larger than or equal to Is, issuing a control instruction of the switch tube T2 to be tested through a pulse distribution board, starting a short-circuit test, and turning off the switch tube T2 after the switch tube T2 Is turned on for tc;
if the I Is less than the Is within the time of ta + 10%, judging that the test Is abnormal, and ending the test;
in the short-circuit test process, detecting the capacitance voltage, the running current, the short-circuit current and the short-circuit time data of the power module;
and 6, recording and storing test data.
7. The soft half-bridge module short-circuit test method according to claim 6, wherein in step 5, the on-time tc of the switching tube T2 is greater than the IGBT driver short-circuit protection time value tsc.
8. The soft half-bridge module short-circuit test method according to claim 7, wherein in step 5, the on-time tc of the switching tube T2 is tsc +20 us.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111447449.9A CN114113861A (en) | 2021-11-30 | 2021-11-30 | Load current adjustable flexible straight half-bridge module short circuit test loop and test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111447449.9A CN114113861A (en) | 2021-11-30 | 2021-11-30 | Load current adjustable flexible straight half-bridge module short circuit test loop and test method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114113861A true CN114113861A (en) | 2022-03-01 |
Family
ID=80369168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111447449.9A Pending CN114113861A (en) | 2021-11-30 | 2021-11-30 | Load current adjustable flexible straight half-bridge module short circuit test loop and test method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114113861A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116953464A (en) * | 2023-07-31 | 2023-10-27 | 荣信汇科电气股份有限公司 | All-condition short circuit test method and device for IGBT power module |
-
2021
- 2021-11-30 CN CN202111447449.9A patent/CN114113861A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116953464A (en) * | 2023-07-31 | 2023-10-27 | 荣信汇科电气股份有限公司 | All-condition short circuit test method and device for IGBT power module |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107332443B (en) | A kind of DC solid transformer and its control method | |
| WO2015081897A1 (en) | Device and method for testing steady-state operation of mmc flexible direct current sub-module | |
| CN100539294C (en) | Digital capacity measuring and repairing instrument for lead acid accumulator | |
| CN105743378B (en) | A kind of T-shaped three-level inverter parallel system and its decoupling control method | |
| CN102508073B (en) | Load test device for large-power frequency converter adopting front active end | |
| CN103972963B (en) | A kind of topological circuit based on cell transformation of electrical energy and system | |
| CN204271887U (en) | A kind of large power, electrically active power converter | |
| CN108879748A (en) | A kind of bidirectional energy-storage current transformer | |
| CN110474366A (en) | A kind of control system for three-phase tri-level photovoltaic combining inverter | |
| CN102005772A (en) | Network combination inversion system and control method thereof | |
| CN111541228B (en) | Device and method for modulating electric energy parameters of low-voltage line tail end of power distribution station area | |
| CN114113861A (en) | Load current adjustable flexible straight half-bridge module short circuit test loop and test method | |
| CN108429453A (en) | On-board high-voltage inversion conversion equipment and control method | |
| CN104900926B (en) | A kind of high-frequency resonance formula lead-acid accumulator prosthetic device and method | |
| CN207475209U (en) | A kind of multi-standard regenerating braking energy absorption plant | |
| CN113131512B (en) | AC-DC hybrid micro-grid switching control system and method based on optical storage | |
| CN102611171B (en) | High-pressure large-current direct-current charger | |
| CN216747916U (en) | Load current adjustable gentle straight half-bridge module short circuit test return circuit | |
| CN202737749U (en) | Low-voltage DC power energy feedback electronic load boost system controlled in digitalized manner | |
| CN102832820A (en) | Digitalized-control low-voltage direct-current power source energy feedback type electronic loading boosting system | |
| CN116298746A (en) | Test system and test platform for power module of energy storage converter | |
| CN108683218A (en) | A kind of quick charge device and its water-cooling system suitable for battery system | |
| CN101860070A (en) | Uninterruptible power supply for high-frequency soft switch of locomotive air conditioner and realization method thereof | |
| CN107026475A (en) | A kind of distributed solar electricity generation system enters network control method | |
| CN202997658U (en) | Inverter and charger integrally modularized H-bridge cascade UPS single/three-phase system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |