CN113640709B - H-bridge cascade PET test method based on black box test - Google Patents
H-bridge cascade PET test method based on black box test Download PDFInfo
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- CN113640709B CN113640709B CN202110681229.6A CN202110681229A CN113640709B CN 113640709 B CN113640709 B CN 113640709B CN 202110681229 A CN202110681229 A CN 202110681229A CN 113640709 B CN113640709 B CN 113640709B
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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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- 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
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2607—Circuits therefor
- G01R31/2608—Circuits therefor for testing bipolar transistors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Inverter Devices (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention discloses an H-bridge cascade type PET test method based on black box test, which comprises a plurality of power conversion sub-modules, wherein each power conversion sub-module is controlled by a sub-module controller through an IGBT driver; the testing method comprises the following steps: s1, carrying out black box test on each power conversion sub-module, and if all the power conversion sub-modules have no defects, turning to the step S2 and the step S3; s2, carrying out black box test on the continuous running stability of PET; s3, performing black box test on the fault isolation capability of the PET; and if the test results of the S2 and the S3 meet the preset requirements, the PET test is passed. According to the black box test principle, if the test result of the current test item meets the requirement, the next test is carried out, and if the test result does not meet the requirement, the test result can be immediately fed back to an operator and the operator is assisted in overhauling and maintenance. The invention can realize comprehensive test of PET, improve the test efficiency and ensure the stability of PET in practical application.
Description
Technical Field
The invention relates to the technical field of alternating current and direct current hybrid power distribution, in particular to a black box test-based H-bridge cascade PET power module and a fault isolation function test method
Background
As a novel power electronic device, a Power Electronic Transformer (PET) not only can provide high-quality electric energy for AC/DC loads, but also can safely and reliably connect various new energy power generation systems, and has the multiple advantages of environmental protection, fault isolation, harmonic suppression, operation mode control, electric energy quality control, DC micro-grid interface provision, stability control and the like, and the advent of the power electronic transformer provides reliable support for overcoming multiple problems existing in the operation and use processes of the existing power system. Clean energy power generation and the like will lead the main stream of future power grid development, new energy power will be pushed in a large range in the near future, the power grid safety risk is practically reduced, and the advantages of the power electronic transformer will be more obvious under the support of a series of advanced technologies such as information technology and the like.
In order to ensure that the power electronic transformer can stably and reliably operate after being put into operation, a power electronic switching device and a power module are required to be tested, and whether the power module meets the design research and development requirements is determined through the test; the power electronic transformer function is required to be tested, whether the power electronic transformer meets the function design requirement or not is determined through the test, and fault protection and self protection can be realized. In this context, the power module and the functional testing method of the power electronic transformer are particularly important.
Because the number of the H-bridge cascade PET internal submodules is large, the individual submodules are different, and the problems that part of submodules are weak in compression resistance and current resistance and the like can exist, if the converter is not subjected to comprehensive functional test, the stability of the converter and even the system operation can be seriously damaged under extreme conditions.
Noun interpretation
The black box test, i.e. the function test, is to consider all test items as a black box whole which cannot be opened during the test, and to detect whether each function can be normally used by the test without considering the internal structure and the internal characteristics thereof. Both causal mapping and decision table methods are common black box tests, typically used in combination, to determine decision conditions by mapping multiple inputs that are simultaneously interacting.
Disclosure of Invention
The invention aims to provide an H-bridge cascade type PET test method based on a black box test, which utilizes a black box test technology to comprehensively test a power module, a fault isolation function and the like of the H-bridge cascade type PET, improves the test efficiency and ensures the stability of the PET in practical application.
The invention adopts the technical scheme that: an H-bridge cascade PET test method comprises the steps that the H-bridge cascade PET comprises a plurality of power conversion submodules, and each power conversion submodule is controlled by a submodule controller through an IGBT driver; the testing method comprises the following steps:
s1, performing black box testing on each power conversion sub-module, wherein the black box testing comprises the following steps: simulating the operation environment of the power conversion submodule, outputting a driving signal to the power conversion submodule by using a submodule controller through an IGBT driver, acquiring the operation parameters of the power conversion submodule in real time, and judging whether the power conversion submodule has defects according to the operation parameters;
if all the power conversion sub-modules have no defects, the step S2 and/or the step S3 is/are carried out;
s2, carrying out black box test on continuous running stability of PET, wherein the black box test comprises the following steps: simulating the running environment of the PET, enabling the PET to run continuously for a set time, controlling a power conversion submodule by utilizing a submodule controller with a voltage stabilizing control function, monitoring the running process parameters of the PET in real time, and judging whether the continuous running stability of the PET meets the preset requirement or not according to the running parameters of the PET;
s3, performing black box testing on the fault isolation capability of the PET, wherein the black box testing comprises the following steps: simulating the operation environment of the joint operation of the PET and the relay protection device, performing power conversion submodule control by using a submodule controller with a voltage stabilizing control function, simulating inter-electrode short-circuit faults, monitoring the operation process parameters of the PET before and after the faults in real time, and judging whether the fault isolation capability of the PET meets the preset requirements;
and if the test results of the S2 and the S3 meet the preset requirements, the PET test is passed.
Optionally, in step S1, the operating environment of the analog power conversion sub-module includes accessing a dc power supply to a bus side of the power conversion sub-module;
the method for judging whether the power conversion sub-module has defects or not according to the operation parameters by utilizing the sub-module controller to output a driving signal to the power conversion sub-module through the IGBT driver comprises the following steps:
s11, performing a driving pulse test, and judging whether a control signal output by the submodule controller accords with preset control program logic or not;
s12, performing IGBT driving test, and judging whether the matching performance of the IGBT driver and the IGBT meets the preset requirement;
s13, performing rated power test of the power conversion submodule, and judging whether the overall electrical performance, long-term stable operation capability and transient short-time overload capability of the power conversion submodule meet preset requirements or not;
s14, performing protection function test of the power conversion sub-module, and judging whether the overcurrent protection capability of the power conversion sub-module under the condition of short circuit meets the preset requirement;
if all the S11-S14 tests are passed, the power conversion sub-module test is passed.
Further optionally, step S11 includes: the method comprises the steps of obtaining a control signal output by a sub-module controller to an IGBT driver, comparing the control signal with a control pulse signal corresponding to preset control program logic, and judging the consistency between the control signal and the control pulse signal; the driving signals received by the power conversion sub-module are obtained and compared with the driving pulse signals corresponding to the control program logic, and the consistency between the driving signals and the driving pulse signals is judged; if the consistency meets the preset requirement, the driving pulse test is passed, and the control signal output by the submodule controller accords with the preset control program logic.
Optionally, step S12 includes: detecting a driving signal output by the IGBT, an IGBT turn-off voltage peak, an IGBT real-time voltage, a reverse recovery current and di/dt of a diode when the IGBT is turned on, and a submodule current, calculating a current increase and decrease rate, and judging whether the coordination performance of the IGBT driver and the IGBT meets preset requirements according to parameters obtained by detection and calculation. The specific judgment basis can refer to the prior art, and can be automatic judgment or manual judgment by a computer.
Optionally, step S13 includes: the direct current power supplies corresponding to rated direct current are added at the two ends of the power conversion submodule, and the on-off of the IGBT in the power conversion submodule is controlled by the submodule controller, so that the converter stably operates for a set time for a long time; after the long-term stable operation is finished, short-time overload test is carried out under the set temperature and the cooling mode according to the parameter specification of the device, if the device is not damaged, the test is passed, and the overall electrical performance, the long-term stable operation capability and the transient short-time overload capability of the power conversion sub-module meet the requirements.
Optionally, in step S14, the performing a protection function test of the power conversion sub-module includes: testing whether a bridge arm IGBT of the power conversion sub-module is locked in time under the condition of short circuit, and if so, conforming to the requirement on the overcurrent protection capability of the power conversion sub-module;
step S14 further includes: and testing the minimum opening voltage of the protection bypass thyristor, the period and the duration of the triggering opening pulse of the protection bypass thyristor, and the shunt capacity of the protection thyristor.
Optionally, in S2, the operating environment of the simulated PET includes: the PET is connected into a medium-high voltage system according to a topological structure, and a filter and a load are configured on a direct current side;
the power conversion submodule control is carried out by utilizing a submodule controller with a voltage-stabilizing control function, PET operation process parameters are monitored in real time, whether the continuous operation stabilizing capability of the PET meets preset requirements is judged according to the PET operation parameters, and the method comprises the following steps:
s21, electrifying a medium-high voltage system to enable the PET to be put into operation under voltage stabilization control, monitoring alternating voltage and current, direct current and load power after the PET runs stably and capacitor voltage of a power conversion submodule, judging whether the fluctuation of data obtained through monitoring accords with a preset range, and if so, passing the test;
s22, performing an AC/DC dynamic conversion power transmission function test, including: under voltage stabilizing control, the load on the direct current side of the sudden increase or sudden decrease power conversion submodule monitors the output power and direct current of the PET in real time, and judges whether the change of the direct current accords with the change of the output power; after the sudden increase or the sudden decrease of the load reaches a steady state, judging whether the direct current voltage of the PET is kept within a preset voltage range and whether the increase and increase amplitude of the load power meets preset requirements; if all the power signals accord with the power transmission function test, the AC/DC dynamic conversion power transmission function test is passed;
if both the tests of S21 and S22 are passed, the continuous operation stabilization capability test of PET is passed.
Optionally, in S3, the operating environment for simulating the joint operation of the PET and the relay protection device includes: the PET is connected into a low-voltage system provided with a direct-current breaker according to a topological structure, and a filter and partial load are arranged on the direct-current side;
the power conversion submodule control is carried out by utilizing a submodule controller with a voltage stabilizing control function, interelectrode short-circuit faults are simulated, running process parameters of PET before and after the faults are monitored in real time, and whether the fault isolation capability of the PET meets preset requirements or not is judged, and the method comprises the following steps:
s31, configuring voltage stabilizing control logic in a submodule controller, electrifying a low-voltage system connected with the PET to enable the PET to be put into operation, and monitoring alternating current voltage and current, direct current voltage, load power and power conversion submodule capacitor voltage after the PET is in steady-state operation;
s32, simulating an interelectrode short circuit fault, switching PET to a blocking operation, monitoring PET alternating current, direct current voltage and current and submodule capacitor voltage in real time, if short-time current impact occurs in alternating current and direct current during faults, the direct current voltage and the capacitor voltage of the power conversion submodule rapidly drop, at the moment, the PET can be blocked in time, and system power transmission is stopped, and judging that the PET has fault isolation capability, and then, turning to the step S33;
s33, simulating interelectrode short circuit fault recovery, enabling the PET to be recovered to voltage stabilizing control, monitoring voltage and current at the direct current side of the PET, alternating current and capacitor voltage of the power conversion submodule in real time, if the PET is recovered to run, the direct current voltage is gradually recovered to a set value, the alternating current and the direct current are recovered to normal running values, the capacitor voltage of the power conversion submodule is recovered to the set value, and the PET and an accessed system run normally, and then the fault isolation capability test of the PET is passed.
Advantageous effects
According to the invention, the black box test method is adopted to test various performance indexes of the H-bridge cascade PET, so that the voltage and current resistant tests of all sub-modules of the PET and the long-term stable operation capability and fault isolation function tests of the PET can be completed, the test efficiency can be greatly improved, and the safe and stable operation of the PET and an accessed system after the PET is put into operation can be ensured.
Drawings
FIG. 1 is a schematic diagram of an H-bridge cascade PET topology;
FIG. 2 is a schematic diagram of a cascade H-bridge PET test flow in accordance with the method of the present invention;
fig. 3 is a schematic diagram of a causal graph method of an H-bridge cascade PET test based on a black box test according to the present invention.
Description of the embodiments
Further description is provided below in connection with the drawings and the specific embodiments.
The technical conception of the invention is as follows: aiming at the problems that the number of the submodules in the H-bridge cascade PET is large, the individual difference exists, the compression resistance and the current resistance of partial submodules are weak, and if the comprehensive functional test is not carried out on the converter, the problem that the converter and even the stability of the system operation are seriously damaged under extreme conditions is solved, the high-efficiency black box test method is adopted, the submodules and the PET are sequentially subjected to the functional test, the next test item is carried out only when the current test item passes, and the specific test failure item and the test failure reason can be fed back to the system each time the item test does not pass. The test efficiency can be improved, and the reliability of the test result is ensured.
Example 1
As shown in fig. 1, the H-bridge cascade PET includes a plurality of power conversion sub-modules, each of which is controlled by a sub-module controller through an IGBT driver.
The embodiment describes an H-bridge cascade PET testing method based on a black box testing technology, and referring to fig. 2, the method includes:
s1, performing black box testing on each power conversion sub-module, wherein the black box testing comprises the following steps: simulating the operation environment of the power conversion submodule, outputting a driving signal to the power conversion submodule by using a submodule controller through an IGBT driver, acquiring the operation parameters of the power conversion submodule in real time, and judging whether the power conversion submodule has defects according to the operation parameters;
if all the power conversion sub-modules have no defects, turning to the step S2 and the step S3, wherein the step S2 and the step S3 are preferably selected from the preceding test, and then any test item does not pass, i.e. the subsequent test is not performed, or the two can be respectively and simultaneously tested;
s2, carrying out black box test on continuous running stability of PET, wherein the black box test comprises the following steps: simulating the running environment of the PET, enabling the PET to run continuously for a set time, controlling a power conversion submodule by utilizing a submodule controller with a voltage stabilizing control function, monitoring the running process parameters of the PET in real time, and judging whether the continuous running stability of the PET meets the preset requirement or not according to the running parameters of the PET;
s3, performing black box testing on the fault isolation capability of the PET, wherein the black box testing comprises the following steps: simulating the operation environment of the joint operation of the PET and the relay protection device, performing power conversion submodule control by using a submodule controller with a voltage stabilizing control function, simulating inter-electrode short-circuit faults, monitoring the operation process parameters of the PET before and after the faults in real time, and judging whether the fault isolation capability of the PET meets the preset requirements;
and if the test results of the S2 and the S3 meet the preset requirements, the PET test is passed.
Example 2
Based on embodiment 1, the embodiment specifically introduces an H-bridge cascade type PET test method based on a black box test technology, and simultaneously utilizes a causal method and a decision table method in a common black box test case design method to determine a decision condition by mapping a plurality of inputs which are mutually influenced at the same time, so that the test efficiency is further improved.
A graph of the cause and effect of this embodiment is shown in fig. 3, where the cause-effect is from left to right in the graph. Symbols-represent non-logic, if the cause is true, the result is not true; symbol A represents AND logic, and the result is true if the reasons are all true; the symbol v indicates or logic, and the result is established if one of the reasons is established. Wherein the reason-result is described as follows:
reason 1: 11-sub-module function test;
intermediate node 1: 21-represents PET basic test pass; 22-represents the failure of the PET basic test, and the maintenance of a specific submodule is required;
reason 2:31-PET continuous run test; testing the fault isolation capability of the 32-PET;
intermediate node 2: 41-indicates that the functional test passes; 42-indicating a functional test failure and informing about the item and reason of the specific test failure;
results: 51-PET can work normally; 52-PET does not work properly.
When PET needs to be tested, the power conversion sub-module is subjected to function and electric test preferentially, after the test is finished, the whole function test of the converter is performed, wherein the whole function test comprises an alternating current-direct current conversion power transmission function and a low voltage ride through function, a black box test method with higher efficiency is adopted, specific test failure items and test failure reasons can be fed back to the system each time item test is not passed, and the inspection and maintenance of each fault item are assisted by an inspection staff.
Specifically, the present embodiment is performed according to the following steps.
1. Corresponding to step S1: in order to ensure that a plurality of internal submodules of the converter PET can meet the requirements of supporting high power transmitted by medium-high voltage power conversion and direct current transmission and short-time various electric shocks when a control strategy is switched, a method for testing functions and electric of the power conversion submodules is provided. The power conversion sub-module is briefly described as a sub-module below.
Firstly, preparing test equipment, including a PET submodule main controller, a test power supply and real-time monitoring equipment, connecting a signal line of the main controller with a submodule signal receiving port, connecting a direct current power supply with an electric interface of the submodule, and monitoring various parameters such as voltage and current of the submodule by the real-time monitoring equipment. According to the black box test principle, when the function test of the sub-module is carried out, other test items are not considered, and the test result is fed back to an operator to assist the operator in maintenance or next test. The method specifically comprises the following steps:
and S11, performing a driving pulse test to test whether the control signal meets the actual control requirement, and after the main controller sends out the IGBT on-off signal, verifying whether the waveform of the sent signal is consistent with the program logic, and then detecting whether the receiving signal of the submodule is consistent with the program logic.
Step S12, performing IGBT driving test, and testing the coordination performance of an IGBT driver and the IGBT, for example, testing the turn-off voltage spike of the IGBT by a step two test method, detecting the real-time voltage of the IGBT, and detecting the voltage spike when the IGBT is turned off; and testing the reverse recovery current and di/dt of the diode when the IGBT is turned on, and monitoring the current and the current increasing and decreasing rate of the submodule in real time.
Step S13: and (3) testing rated power of the submodule, testing integral electrical performance of the submodule, and testing long-term stable operation capability and short-term overload capability of the submodule. Performing long-time operation test according to rated parameters of the submodule; and after the long-time stable operation is finished, short-time overload test is carried out at a specified temperature and in a cooling mode according to the parameter specification of the device.
Step S14: testing the protection function of the submodule, testing the overcurrent protection capability of the IGBT under the short circuit condition, and judging whether the bridge arm IGBT is locked in time under the short circuit condition, wherein if the bridge arm IGBT is locked, the overcurrent protection capability of the submodule meets the actual operation requirement; testing the minimum opening voltage of the bypass thyristor; testing the period and the duration of the bypass thyristor triggering opening pulse and testing the shunt capacity of the protection thyristor.
According to the schematic diagram of the black box test, if the performance test of the submodule passes, the next test is carried out; if the performance test of the submodule is not passed, the performance test is immediately fed back to an operator and is assisted in overhauling and maintenance.
2. Corresponding to step S2: in order to ensure that PET is continuously, safely and stably transmitted, the PET is required to be tested for long-time running stability.
The preparation test equipment comprises a sub-module main controller, an alternating current power supply, a test monitoring system, a load and the like. The controller is provided with voltage stabilizing control, alternating current voltage and current monitoring, direct current voltage monitoring, load power monitoring and converter power unit voltage monitoring, and PET is connected into a medium-high voltage system. According to the black box test principle, when the PET long-term stable operation test is carried out, other test items are not considered, and the test result is fed back to an operator to assist the operator in maintenance or next test. The method specifically comprises the following steps:
and S21, connecting the PET to a medium-high voltage system, and monitoring alternating voltage and current output, direct voltage output, load power and module capacitance voltage in real time after the PET is stable. If the direct current voltage and the direct current are stable direct current waveforms and the load power is stable, the capacitance voltage of the submodule fluctuates near a set value, and the steady state normal operation of the converter is represented;
and S22, under the control of voltage stabilization, the PET output power is increased and decreased along with the increase and decrease of the DC side sudden increase and decrease of the load, the increase and decrease of the DC current are monitored in real time and are in line with the increase and decrease of the power, after the steady state is reached, the DC voltage is still kept at a set value, the load power is increased and the increase amplitude meets the control design, and then the AC-DC dynamic conversion power transmission function test of the converter is passed.
According to the schematic diagram of the black box test, if the PET long-term stable operation test meets the requirement, performing the next test; if the PET long-term stable operation test does not pass, the PET long-term stable operation test is immediately fed back to an operator and is assisted in overhauling and maintenance.
3. Corresponding to step S3: the PET is considered to have the capability of isolating AC/DC faults, so that the DC fault isolation test method is designed.
Firstly, a testing device is prepared, wherein the testing device comprises a sub-module main controller, an alternating current power supply, a controllable direct current power supply, real-time monitoring equipment, a relay protection device, a filter and a load. And configuring links such as voltage stabilizing control, alternating voltage and current monitoring, direct voltage monitoring, load power monitoring, converter power unit voltage monitoring and the like in the main controller. In the test stage, the converter can be connected into a low-voltage system according to a topological structure for testing, and a filter and partial load are configured on the DC side. Because the inter-electrode short circuit fault is serious, the test is carried out under a low-voltage system and a direct current breaker is configured. According to the black box test principle, when the PET fault isolation capability test is carried out, other test items are not considered, and the test result is fed back to an operator to assist the operator in maintenance or next test. The method specifically comprises the following steps:
s31, configuring voltage stabilizing control logic in a submodule controller, electrifying a low-voltage system connected with the PET to enable the PET to be put into operation, and monitoring alternating current voltage and current, direct current voltage, load power and power conversion submodule capacitor voltage after the PET is in steady-state operation;
s32, simulating an interelectrode short-circuit fault, and switching the PET converter to a locking operation. The main controller monitors alternating current, direct current voltage and current and submodule capacitor voltage in real time, if the alternating current and the direct current have short-time current impact during faults, the direct current voltage and the submodule capacitor voltage can drop rapidly, and if the PET can be locked in time at the moment, the system power transmission is stopped, and the PET has fault isolation capability;
s33, simulating interelectrode short-circuit fault recovery, recovering PET to voltage stabilization control, and monitoring direct-current side voltage and current, alternating current and submodule capacitor voltage in real time by a main controller; after the PET is recovered to run, the direct current voltage is gradually recovered to a set value, the alternating current and the direct current are recovered to normal running values, the capacitance voltage of the submodule is recovered to the set value, the PET and the system run normally, and the fault isolation test is completed.
According to the schematic diagram of the black box test, if the fault isolation capability test of the PET meets the requirement, performing the next test; if the fault isolation capability test of the PET is not passed, the fault isolation capability test is immediately fed back to an operator and is assisted in overhauling and maintenance.
According to the embodiment, the black box testing technology is utilized, so that the PET can be comprehensively tested, the testing efficiency is improved, and the stability of the PET in practical application is guaranteed.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are all within the protection of the present invention.
Claims (7)
1. An H-bridge cascade PET test method comprises the steps that the H-bridge cascade PET comprises a plurality of power conversion submodules, and each power conversion submodule is controlled by a submodule controller through an IGBT driver; the testing method is characterized by comprising the following steps:
s1, performing black box testing on each power conversion sub-module, wherein the black box testing comprises the following steps: simulating the operation environment of the power conversion submodule, outputting a driving signal to the power conversion submodule by using a submodule controller through an IGBT driver, acquiring the operation parameters of the power conversion submodule in real time, and judging whether the power conversion submodule has defects according to the operation parameters; the operation environment of the analog power conversion sub-module comprises that a direct current power supply is connected to a bus side of the power conversion sub-module;
the method for judging whether the power conversion sub-module has defects or not according to the operation parameters by utilizing the sub-module controller to output a driving signal to the power conversion sub-module through the IGBT driver comprises the following steps:
s11, performing a driving pulse test, and judging whether a control signal output by the submodule controller accords with preset control program logic or not;
s12, performing IGBT driving test, and judging whether the matching performance of the IGBT driver and the IGBT meets the preset requirement;
s13, performing rated power test of the power conversion submodule, and judging whether the overall electrical performance, long-term stable operation capability and transient short-time overload capability of the power conversion submodule meet preset requirements or not;
s14, performing protection function test of the power conversion sub-module, and judging whether the overcurrent protection capability of the power conversion sub-module under the condition of short circuit meets the preset requirement;
if the tests of S11-S14 are all passed, the test of the power conversion submodule is passed;
if all the power conversion sub-modules have no defects, the step S2 and/or the step S3 is/are carried out;
s2, carrying out black box test on continuous running stability of PET, wherein the black box test comprises the following steps: simulating the running environment of the PET, enabling the PET to continuously run for a set time, performing power conversion submodule voltage stabilization control and alternating current-direct current dynamic conversion power transmission function test by using a submodule controller with a voltage stabilization control function, monitoring PET running process parameters in real time, and judging whether the continuous running stability of the PET meets preset requirements according to the PET running parameters; wherein the simulated PET operating environment comprises: the PET is connected into a medium-high voltage system according to a topological structure, and a filter and a load are configured on a direct current side;
s3, performing black box testing on the fault isolation capability of the PET, wherein the black box testing comprises the following steps: simulating the operation environment of the joint operation of the PET and the relay protection device, performing power conversion submodule control by using a submodule controller with a voltage stabilizing control function, simulating inter-electrode short circuit faults and fault recovery, monitoring the operation process parameters of the PET before and after the faults are recovered in real time, and judging whether the fault isolation capability of the PET meets preset requirements or not; the operation environment for simulating the joint operation of the PET and the relay protection device comprises the following steps: the PET is connected into a low-voltage system provided with a direct-current breaker according to a topological structure, and a filter and partial load are arranged on the direct-current side;
and if the test results of the S2 and the S3 meet the preset requirements, the PET test is passed.
2. The method according to claim 1, wherein step S11 comprises: the method comprises the steps of obtaining a control signal output by a sub-module controller to an IGBT driver, comparing the control signal with a control pulse signal corresponding to preset control program logic, and judging the consistency between the control signal and the control pulse signal; the driving signals received by the power conversion sub-module are obtained and compared with the driving pulse signals corresponding to the control program logic, and the consistency between the driving signals and the driving pulse signals is judged; if the consistency meets the preset requirement, the driving pulse test is passed, and the control signal output by the submodule controller accords with the preset control program logic.
3. The method according to claim 1, wherein step S12 comprises: detecting a driving signal output by the IGBT, an IGBT turn-off voltage peak, an IGBT real-time voltage, a reverse recovery current and di/dt of a diode when the IGBT is turned on, and a submodule current, calculating a current increase and decrease rate, and judging whether the coordination performance of the IGBT driver and the IGBT meets preset requirements according to parameters obtained by detection and calculation.
4. The method according to claim 1, wherein step S13 comprises: the direct current power supplies corresponding to rated direct current are added at the two ends of the power conversion submodule, and the on-off of the IGBT in the power conversion submodule is controlled by the submodule controller, so that the converter stably operates for a set time for a long time; after the long-term stable operation is finished, short-time overload test is carried out under the set temperature and the cooling mode according to the parameter specification of the device, if the device is not damaged, the test is passed, and the overall electrical performance, the long-term stable operation capability and the transient short-time overload capability of the power conversion sub-module meet the requirements.
5. The method according to claim 1, wherein in step S14, the performing a protection function test of the power conversion sub-module includes: testing whether a bridge arm IGBT of the power conversion sub-module is locked in time under the condition of short circuit, and if so, conforming to the requirement on the overcurrent protection capability of the power conversion sub-module;
step S14 further includes: and testing the minimum opening voltage of the protection bypass thyristor, the period and the duration of the triggering opening pulse of the protection bypass thyristor, and the shunt capacity of the protection thyristor.
6. The method according to claim 1, wherein in S2, the performing power conversion submodule control by using a submodule controller configured with a voltage-stabilizing control function, monitoring PET operation process parameters in real time, and determining whether continuous operation stability of the PET meets a preset requirement according to the PET operation parameters includes:
s21, electrifying a medium-high voltage system to enable the PET to be put into operation under voltage stabilization control, monitoring alternating voltage and current, direct current and load power after the PET runs stably and capacitor voltage of a power conversion submodule, judging whether the fluctuation of data obtained through monitoring accords with a preset range, and if so, passing the test;
s22, performing an AC/DC dynamic conversion power transmission function test, including: under voltage stabilizing control, the load on the direct current side of the sudden increase or sudden decrease power conversion submodule monitors the output power and direct current of the PET in real time, and judges whether the change of the direct current accords with the change of the output power; after the sudden increase or the sudden decrease of the load reaches a steady state, judging whether the direct current voltage of the PET is kept within a preset voltage range and whether the increase and increase amplitude of the load power meets preset requirements; if all the power signals accord with the power transmission function test, the AC/DC dynamic conversion power transmission function test is passed;
if both the tests of S21 and S22 are passed, the continuous operation stabilization capability test of PET is passed.
7. The method according to claim 1, wherein in S3, the performing power conversion sub-module control by using the sub-module controller with the voltage stabilizing control function, simulating an inter-electrode short circuit fault, monitoring operation process parameters of the PET before and after the fault in real time, and determining whether fault isolation capability of the PET meets a preset requirement includes:
s31, configuring voltage stabilizing control logic in a submodule controller, electrifying a low-voltage system connected with the PET to enable the PET to be put into operation, and monitoring alternating current voltage and current, direct current voltage, load power and power conversion submodule capacitor voltage after the PET is in steady-state operation;
s32, simulating an interelectrode short circuit fault, switching PET to a blocking operation, monitoring PET alternating current, direct current voltage and current and submodule capacitor voltage in real time, if short-time current impact occurs in alternating current and direct current during faults, the direct current voltage and the capacitor voltage of the power conversion submodule rapidly drop, at the moment, the PET can be blocked in time, and system power transmission is stopped, and judging that the PET has fault isolation capability, and then, turning to the step S33;
s33, simulating interelectrode short circuit fault recovery, enabling the PET to be recovered to voltage stabilizing control, monitoring voltage and current at the direct current side of the PET, alternating current and capacitor voltage of the power conversion submodule in real time, if the PET is recovered to run, the direct current voltage is gradually recovered to a set value, the alternating current and the direct current are recovered to normal running values, the capacitor voltage of the power conversion submodule is recovered to the set value, and the PET and an accessed system run normally, and then the fault isolation capability test of the PET is passed.
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