CN109655703A - Self checking method, device, equipment and the storage medium of parallel power module - Google Patents
Self checking method, device, equipment and the storage medium of parallel power module Download PDFInfo
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- CN109655703A CN109655703A CN201811649478.1A CN201811649478A CN109655703A CN 109655703 A CN109655703 A CN 109655703A CN 201811649478 A CN201811649478 A CN 201811649478A CN 109655703 A CN109655703 A CN 109655703A
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
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Abstract
The embodiment of the present application provides self checking method, device, equipment and the storage medium of a kind of parallel power module.The self checking method of the parallel power module is included in when meeting preset self-test condition, executes following self-test step at least one of at least one set of parallel power module power module to be measured: the switching device of the first bridge arm is with first frequency turn-on and turn-off in the power module that control and power module to be measured are in parallel；Detect the three-phase alternating current in the circuit that power module to be measured is formed with the power module being in parallel；Judge in three-phase alternating current with the presence or absence of the loop current changed with first frequency；If there is the loop current changed with first frequency in three-phase alternating current, it is determined that there are short troubles for power module to be measured.The embodiment of the present application, which is not necessarily to increase other circuits in modularization wind electric converter system, can be realized fault detection to power module, and the fault identification ability to power module is improved on the basis of not increasing system cost.
Description
Technical field
This application involves converter topology fields, specifically, this application involves a kind of parallel power modules from procuratorial organ
Method, device, equipment and storage medium.
Background technique
With the development of wind generating technology, for the trend that degree of reply electricity cost reduces, the capacity of wind power generating set
It is continuous to improve.In order to realize the Quick Extended of wind electric converter capacity, modularization wind electric converter technology starts to realize application,
It is a kind of to standardize power module (Power Stack) at present there are many kinds of the technology paths of modularization wind electric converter, pass through
The capacity of different wind electric converters is realized in the parallel connection of multiple power modules；Another by power module and periphery main electricity
(realize reduces the electricity that current transformer pusher side is input to wind-driven generator to road such as dudt (i.e. du/dt, the derivative of current versus time) circuit
Buckling rate and common-mode voltage, differential mode voltage peak value function) and filter (filter) circuit (current transformer net side
Filter circuit reduces the grid-connected harmonic wave of current transformer) it is encapsulated in a power cabinet body, in parallel by power cabinet body realizes wind-powered electricity generation
The promotion of converter system capacity.
For wind electric converter, power module therein be easy to occur failure of removal, first power on starting or
During being restarted after failure, how to judge whether power module can work normally, become asking for a urgent need to resolve
Topic.Existing scheme generally directly detects the output voltage of power module, by output voltage and control signal comparison,
Or whether the multilevel iudge power module between output voltage accurately performs switch order.
However the method that the existing output voltage to power module is directly detected, need additionally to increase a set of voltage inspection
It surveys and sample circuit, comparison circuit and judges processing circuit, increase the quantity of internal system device, while increasing system
Cost is unfavorable for promoting the use of；For multiple module paralleling system, the quantity of execution processing unit structure is multiplied, and increases system
Risk point, while will increase the insulation request for voltage detecting processing circuit.
Summary of the invention
The application is directed to the shortcomings that existing way, proposes the self checking method of parallel power module a kind of, device, equipment and deposits
Storage media, to solve increase internal system device of the existing technology and increase system risk point the technical issues of.
In a first aspect, the embodiment of the present application provides a kind of self checking method of parallel power module, it is default to be included in satisfaction
Self-test condition when, following self-test step is executed at least one of at least one set of parallel power module power module to be measured:
The switching device for controlling the first bridge arm in the power module being in parallel with power module to be measured is led with first frequency
Logical and shutdown；
Detect the three-phase alternating current in the circuit that power module to be measured is formed with the power module being in parallel；
Judge in three-phase alternating current with the presence or absence of the loop current changed with first frequency；
If there is the loop current changed with first frequency in three-phase alternating current, it is determined that there are short for power module to be measured
Road failure.
Second aspect, the embodiment of the present application provide a kind of self-checking unit of parallel power module, and it is default to be included in satisfaction
Self-test condition when the following of self-test step is executed at least one of at least one set of parallel power module power module to be measured
Module:
Switching device control module, for controlling opening for the first bridge arm in the power module being in parallel with power module to be measured
Device is closed with first frequency turn-on and turn-off；
Current detection module, the three-phase in circuit that the power module for detecting power module to be measured and being in parallel is formed
Alternating current；
Breakdown judge module, is used for: judging in three-phase alternating current with the presence or absence of the loop current changed with first frequency；
If there is the loop current changed with first frequency in three-phase alternating current, it is determined that there are short troubles for power module to be measured.
The third aspect, the embodiment of the present application provide a kind of self-checking equipment of parallel power module, comprising: memory and place
Device is managed, memory is stored with computer program, which is executed by processor to realize the embodiment of the present application first party
The self checking method for the parallel power module that face provides.
Fourth aspect, the embodiment of the present application provide a kind of computer readable storage medium, are stored with computer program, should
The self checking method for the parallel power module that the embodiment of the present application first aspect provides is realized when computer program is executed by processor.
Technical solution provided by the embodiments of the present application, at least has the following beneficial effects:
Structure of the embodiment of the present application based on existing modularization wind electric converter system applies one to parallel power module
The pulse control signal of frequency is determined to control the switch motion of corresponding switching device, to form current loop, and to parallel connection
The electric current of power module is detected, so that the fault detection to parallel power module is realized, without becoming in modularization wind-powered electricity generation
It flows and increases other circuits in device system, the quantity of modularization wind electric converter internal system device is reduced in fault detection,
It reduces system cost while decreasing system risk point, improve on the basis of not increasing system cost to power module
Fault identification ability.
The additional aspect of the application and advantage will be set forth in part in the description, these will become from the following description
It obtains obviously, or recognized by the practice of the application.
Detailed description of the invention
The application is above-mentioned and/or additional aspect and advantage will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, in which:
Fig. 1 be the invention relates to a kind of modularization wind electric converter topological schematic diagram；
Fig. 2 is two level circuit schematic illustrations of the Modular cabinet parallel connection of modularization wind electric converter；
Fig. 3 is the tri-level circuit schematic illustration of the Modular cabinet parallel connection of modularization wind electric converter；
Fig. 4 is a kind of flow diagram of the self checking method of parallel power module provided by the embodiments of the present application；
Fig. 5 is the part flow diagram of the self checking method of another parallel power module provided by the embodiments of the present application；
Fig. 6 is a kind of self-test principle signal of the parallel power module of two level wind electric converters in the embodiment of the present application
Figure；
Fig. 7 is a kind of self-test principle signal of the parallel power module of three level wind electric converters in the embodiment of the present application
Figure；
Fig. 8 is another self-test principle signal of the parallel power module of three level wind electric converters in the embodiment of the present application
Figure；
Fig. 9 is a kind of structural framing schematic diagram of the self-checking unit of parallel power module provided by the embodiments of the present application；
Figure 10 is a kind of structural framing schematic diagram of the self-checking equipment of parallel power module provided by the embodiments of the present application.
Specific embodiment
The application is described below in detail, the example of the embodiment of the present application is shown in the accompanying drawings, wherein it is identical from beginning to end or
Similar label indicates same or similar component or component with the same or similar functions.In addition, if known technology
Detailed description is characterized in the application shown unnecessary, then omits it.Below with reference to the reality of attached drawing description
It applies example to be exemplary, is only used for explaining the application, and the limitation to the application cannot be construed to.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific term), there is meaning identical with the general understanding of those of ordinary skill in the application fields.Should also
Understand, those terms such as defined in the general dictionary, it should be understood that have in the context of the prior art
The consistent meaning of meaning, and unless idealization or meaning too formal otherwise will not be used by specific definitions as here
To explain.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singular " one " used herein, " one
It is a ", " described " and "the" may also comprise plural form.It is to be further understood that being arranged used in the description of the present application
Diction " comprising " refer to that there are the feature, integer, step, operation, element and/or component, but it is not excluded that in the presence of or addition
Other one or more features, integer, step, operation, element, component and/or their group.It should be understood that when we claim member
Part is " connected " or when " coupled " to another element, it can be directly connected or coupled to other elements, or there may also be
Intermediary element.In addition, " connection " used herein or " coupling " may include being wirelessly connected or wirelessly coupling.It is used herein to arrange
Diction "and/or" includes one or more associated wholes for listing item or any cell and all combinations.
First to this application involves several nouns be introduced and explain:
Wind generator system: a kind of energy absorbing wind, and it is converted into the system that electric energy generates electricity by way of merging two or more grid systems.
Modularization wind electric converter: it is a kind of to use modular framework, realize the wind electric converter of operational blocks which partition system parallel connection.
Power module: one kind is mainly made of controllable semiconductor device, realizes DC/AC (Direct Current/
Alternating Current, DC/AC) or AC/DC (Alternating Current/Direct Current, friendship
Stream/direct current) conversion funtion part.
Current transformer pusher side: the input side of current transformer is connected to wind-driven generator.
Current transformer net side: the outlet side of current transformer is connected to AC network.
Become device to modularization wind-powered electricity generation referring to Fig. 1 and Fig. 2 to be introduced:
Fig. 1 shows the topological schematic diagram of modularization wind electric converter, as shown in Figure 1, modularization wind electric converter is by N (N
For positive integer) a modular power cabinet body (Module) is in parallel constitutes, and the exchange input side parallel connection of N number of modular power cabinet body connects
It is connected together, wind-driven generator is connected to by switch S1, the exchange outlet side of N number of modular power cabinet body is connected in one in parallel
It rises, the transformer of grid side is connected to by switch S2, the direct current of N number of modular power cabinet body is connected in parallel respectively, forms DC+
The bus rod of the bus rod and DC- (direct current is negative) of (direct current is just).
Q11, Q21, Q31 and QN1 in Fig. 1 be respectively power cabinet body 1 (Module 1), power cabinet body 2 (Module 2),
Close to the switch of generator side in power cabinet body 3 (Module 3) and power cabinet body N (Module N), Q12, Q22, Q32 and
QN2 is respectively the switch in power cabinet body 1, power cabinet body 2, power cabinet body 3 and power cabinet body N close to transformer side, wherein
Between power cabinet body 3 and power cabinet body N can also include other parallel connections power cabinet body, accordingly, between Q31 and QN1 and
May include other switches between Q32 and QN2, be not shown to simplify the explanation, in Fig. 1 other parallel connections power cabinet body and
Corresponding switch.
Fig. 2 shows two level circuit schematic illustrations of Modular cabinet parallel connection, as shown in Fig. 2, each modularization cabinet
Body is respectively by pusher side power module Power Stack n1 (being responsible for the low frequency ac of pusher side being converted to direct current) and net side function
Rate module Power Stack n2 composition (is responsible for DC inversion being that industrial-frequency alternating current is grid-connected), and all power modules are total to direct current
Bus, all power modules are respectively arranged with three-phase Hall current sensor (standard configuration) in three-phase alternating current output end, and n is positive integer.
Fig. 3 shows the tri-level circuit schematic illustration of Modular cabinet parallel connection, compared to two level circuits in Fig. 2,
Tri-level circuit in Fig. 3 can also export NP (neutral point) level other than DC+ level and DC- level.
In modularization wind electric converter, full-control type semiconductor devices IGBT (Insulated Gate Bipolar
Transistor, insulated gate bipolar transistor) be power module chief component, since semiconductor devices is for electricity
The extraneous factors such as pressure, temperature, humidity, electric current, height above sea level are especially sensitive, it is easy to failure of removal occurs, and event occurs for IGBT
After barrier, power module can not just be continued to run.IGBT failure normally behaves as short circuit or open circuit, after short circuit occurs for IGBT,
The short circuit current circuit that uncontrollable rectifier can be formed by the diode of other bridge arms in three-phase bridge arm, in turn results in power module
Whole damage, expand failure；After open circuit occurs for IGBT, it will form the electric current missing of half period, cause power control
Unstable and reactor magnetic saturation, it is final to influence system operational safety.
How the technical solution of the application and the technical solution of the application are solved with specifically embodiment below above-mentioned
Technical problem is described in detail.These specific embodiments can be combined with each other below, for the same or similar concept
Or process may repeat no more in certain embodiments.Below in conjunction with attached drawing, embodiments herein is described.
The embodiment of the present application provides a kind of self checking method of parallel power module, as shown in figure 4, the self checking method includes
When meeting preset self-test condition, at least one of at least one set of parallel power module power module to be measured is executed following
Self-test step:
The switching device of the first bridge arm is with the first frequency in the power module that S401, control and power module to be measured are in parallel
Rate turn-on and turn-off.
Parallel power module in the embodiment of the present application may belong to two level block wind electric converters, also may belong to
Three level block wind electric converters, accordingly, self checking method provided by the embodiments of the present application is applicable to two level blocks
Wind electric converter is equally applicable to three level block wind electric converters.
Optionally, when parallel power module belongs to two level block wind electric converters, the first bridge arm is affiliated power
Half bridge arm of any one in module；When parallel power module belongs to three level block wind electric converters, the first bridge arm is institute
Any one half bridge arm or the first bridge arm belonged in power module in non-zero level bridge arm is zero level bridge in affiliated power module
Any one IGBT bridge arm in arm.
Optionally, when power module to be measured is more than two, the power being in parallel with the first power module to be measured is controlled
While the switching device of the first bridge arm is connected with first frequency in module, what control was in parallel with the second power module to be measured
The switching device of the first bridge arm is turned off with first frequency in power module；Wherein, the first power module to be measured and second to be measured
Power module is two power modules to be measured adjacent in more than two power modules to be measured.
For example, for by N number of power module (pusher side and net side be N number of power module) wind electric converter in parallel formed
System, in order to detect the failure of n-th power module and the N-2 power module simultaneously, in control and n-th power module phase
While the switching device of first bridge arm is connected with first frequency in the N-1 power module in parallel, control is a with N-2
The switching device of the first bridge arm turns off at the same frequency in the N-3 power module that power module is in parallel.
S402 detects the three-phase alternating current in the circuit that power module to be measured is formed with the power module being in parallel.
Specifically, power module to be measured and phase can be detected using the current sensor in power module said system to be measured
The three-phase alternating current in circuit that power module in parallel is formed；For example, for modularization wind electric converter system, it can
Electric current is detected using the current sensor of modularization wind electric converter itself, without additionally increasing detection circuit.
S403 judges in three-phase alternating current with the presence or absence of the loop current changed with first frequency；If so, executing step
Rapid S404；If it is not, then executing S405.
Optionally, judge whether at least phase alternating current in three-phase alternating current is the circulation changed with first frequency
Electric current；If so, thinking to have the loop current changed with first frequency in three-phase alternating current and executing S404；If it is not, then
Think it is that there is no the loop currents changed with first frequency, and execute S405 in three-phase alternating current.
S404 determines that there are short troubles for power module to be measured.
Optionally, it may be determined that there are short troubles for the corresponding bridge arm of an at least phase alternating current in power module to be measured.
S405 controls the switching device of the second bridge arm in power module to be measured with second frequency turn-on and turn-off, and
The switching device for controlling the first bridge arm in the power module being in parallel is held on second frequency turn-on and turn-off or
State.
Optionally, when parallel power module belongs to two level block wind electric converters, the first bridge arm is affiliated power
Any one half bridge arm in module, the second bridge arm are one and half bridge arms corresponding with the first bridge arm in affiliated power module.
When parallel power module belongs to three level block wind electric converters, the first bridge arm is zero in affiliated power module
Any one IGBT bridge arm in level bridge arm, the second bridge arm be in affiliated power module in non-zero level bridge arm with the first bridge
Corresponding one and half bridge arm of arm, or, the first bridge arm is any one half-bridge in affiliated power module in non-zero level bridge arm
Arm, the second bridge arm are the IGBT bridge arm corresponding with the first bridge arm in affiliated power module in zero level bridge arm.
Optionally, when power module to be measured is more than two, the power being in parallel with the first power module to be measured is controlled
While the switching device of the first bridge arm is connected with second frequency in module, what control was in parallel with the second power module to be measured
The switching device of the first bridge arm is turned off with second frequency in power module.
For example, for by N number of power module (pusher side and net side be N number of power module) wind electric converter in parallel formed
System, in order to detect the failure of n-th power module and the N-2 power module simultaneously, the in controlling n-th power module
While the switching device of one bridge arm is connected with second frequency, the derailing switch of the first bridge arm in the N-2 power module is controlled
Part turns off at the same frequency, i.e. the turn-on and turn-off in n-th power module and the first bridge arm of the N-2 power module
In the process, whenever the switch device conductive of the first bridge arm in n-th power module, the first bridge arm in the N-2 power module
Switching device shutdown, whenever the switching device shutdown of the first bridge arm in n-th power module, in the N-2 power module
The switch device conductive of first bridge arm；The movement for the N-1 power module being in parallel with n-th power module and n-th function
Rate module keeps strokes or is always maintained on state, the N-3 power module being in parallel with the N-2 power module
Movement and the N-2 power module keep strokes or are always maintained on state.
Optionally, the specific frequency values of the first frequency in the embodiment of the present application and second frequency can identical not yet
Together, can be arranged according to actual needs.
S406 detects the actual current value of the three-phase output electric current of power module to be measured.
Specifically, the three of power module to be measured can be detected using the current sensor in power module said system to be measured
Mutually export the actual current value of electric current；For example, for modularization wind electric converter system, using modularization wind-powered electricity generation unsteady flow
The current sensor of device itself detects electric current, without additionally increasing detection circuit.
S407 judges whether the actual current value of three-phase output electric current is consistent with the theoretical value of three-phase output electric current；If so,
Then follow the steps S408；If it is not, thening follow the steps S409.
Optionally, whether the difference of the actual current value and theoretical value that judge three-phase output electric current is in preset difference model
In enclosing；If so, thinking that the actual current value of three-phase output electric current is consistent with the three-phase output theoretical value of electric current and executes step
S408；If three-phase, which exports, has the actual current value of at least phase output electric current and the difference of theoretical value not preset in electric current
In difference range, then it is assumed that the actual current value of three-phase output electric current is inconsistent with the theoretical value that three-phase exports electric current and executes step
Rapid S409.
S408, determining power module to be measured, there is no failure of removal.
S409 determines that there are failure of removal for power module to be measured.
Specifically, it may be determined that a bridge arm (such as the first bridge arm) corresponding in power module, there are failure of removal.
In an optional embodiment, it may be determined that the corresponding bridge arm of at least phase output electric current in power module to be measured
There are failure of removal；Wherein, failure of removal includes short trouble or open circuit fault.
Above-mentioned steps S405-S409 in the embodiment of the present application is optional step.
It optionally, can be simultaneously to two at least one set of parallel power module when power module to be measured is more than two
A above power module to be measured executes above-mentioned self-test step.
Specifically, in order to improve the efficiency of self-test, the power module to be measured of the power module to be measured of pusher side and net side can be with
Above-mentioned self-test step is separately executed, such as is performed simultaneously above-mentioned self-test step.For by N number of power module (pusher side and
Net side is N number of power module) the wind electric converter system formed in parallel can be right in order to further increase self-test efficiency
While n-th power module carries out self-test, self-test also is carried out to the N-2 power module, remaining power module is similarly.
Optionally, as shown in figure 5, the self checking method of parallel power module provided by the embodiments of the present application, in step S401
It before further include following steps S501-S503；
S501 detects DC voltage when the DC bus connected at least one set of parallel power module charges.
S502, judges whether DC voltage reaches preset voltage threshold；If so, executing S503；If it is not, then executing
S501。
The voltage threshold can be arranged according to actual needs.
S503, determination meet self-test condition.
Fig. 6 shows a kind of self-test principle of the parallel power module of two level wind electric converters, below by the function in Fig. 6
Rate module 12 is used as power module to be measured, and as example to the self checking method of parallel power module provided by the embodiments of the present application
The expansion process of optional embodiment a kind of be introduced:
As shown in fig. 6, being filled first with preliminary filling electrical circuit to DC bus in the case where switch S1 and S2 disjunction
Electricity, real-time detection DC voltage during the charging process, when DC voltage reaches preset voltage threshold, it is believed that meet self-test item
Part simultaneously disconnects preliminary filling electrical circuit, starts following self-check program:
1) exchange output the switch Q12 and Q22 for controlling power module are closed, so that power module 12 and power module 22
Ac output end links together after reactor (Inductor).
2) all of the lower half bridge arm (i.e. an IGBT bridge arm in Fig. 6 between DC- and AC) of power module 22 are controlled
IGBT starts simultaneously at the three-phase alternating current of acquisition power module 12 and power module 22 with first frequency turn-on and turn-off, if
There is the loop current that changes with first frequency at this time, then there are short dots by the IGBT for showing inside power module 12；Specifically,
If A phase there are the loop current that first frequency changes, shows A phase upper half bridge arm (the i.e. DC+ and AC in Fig. 6 of power module 12
Between an IGBT bridge arm) IGBT occur short circuit；If B phase has the loop current changed with first frequency, show function
Short circuit occurs for the IGBT of the B phase upper half bridge arm of rate module 12；If C phase has the loop current changed with first frequency, show
Short circuit occurs for the IGBT of the C phase upper half bridge arm of power module 12.
If being detected as step 2) is normal, that is, appoint in the three-phase alternating current of the power module 12 and power module 22 that acquire
The loop current changed with first frequency is not present in a phase alternating current of anticipating, then continues to examine by subsequent step 3)
It surveys.
3) all IGBT in the upper half bridge arm of power module 12 are controlled with second frequency turn-on and turn-off, and switch motion
It is synchronous with all IGBT in the lower half bridge arm of power module 22, i.e., when the IGBT of the upper half bridge arm of power module 12 is connected, function
The IGBT of the lower half bridge arm of rate module 22 is similarly on state, and detects the reality of the three-phase output electric current of power module 12
Current value.
When the IGBT of the upper half bridge arm of power module 12 IGBT corresponding with the lower half bridge arm of power module 22 equally locates
When on state, will form the circulation flow path as shown in dotted portion in Fig. 5, (it is logical to there is independent electric current in three-phase bridge arm
Road only shows a current path therein to simplify the explanation in Fig. 6), the electric current of DC support capacitor can pass through power mould
The IGBT of the upper half bridge arm of block 12, by the outputting inductance of power module 12, then successively by switch Q12, switch Q22 and
Then the outputting inductance of power module 22 constitutes circuit by the IGBT of the lower half bridge arm of power module 22.
In this step, reasonable computation and control turn-on time and preliminary filling can be passed through according to the parameter of converter system
The threshold voltage of electricity, it is ensured that export the peak value of electric current in the permission current range of IGBT.
4) judge whether the actual current value for detecting the three-phase output electric current of power module 12 equal and difference with theoretical value
Whether value is in preset difference range, if it is detected that any phase exports the actual current value and reason of electric current in three-phase output electric current
By value difference exceed preset difference range, then it is believed that the IGBT of the upper half bridge arm of power module 12 there are failure conditions.
Above-mentioned theory value can calculate in the following way:
Assuming that the frequency of IGBT switch motion is Fsw, the turn-on time for switching each period is Ton, DC bus-bar voltage is
Udc, the common mode inductance amount of the outputting inductance of power module is Lcom, then the three-phase output current peak of the power module 12 detected
Ia、IbAnd IcShould be equal and it be all satisfied following expression:
Ia=Ib=Ic=Udc×Ton/(2×Lcom)
U in above formuladc×Ton/(2×Lcom) it is the theoretical value that three-phase exports electric current.
Based on the example of two level blocks wind electric converter shown in fig. 6, it will be understood by those skilled in the art that passing through
The turn-on and turn-off for controlling the lower half bridge arm of power module 12 and the upper half bridge arm of power module 22, can be to power module 12
The failure conditions of lower half bridge arm carry out self-test, and testing principle is identical as principle shown in fig. 6, and details are not described herein again.
It in the embodiment of the present application, can also be to appointing in power module 22, power module 11 and the power module 21 in Fig. 6
Module of anticipating carries out fault detection, and testing principle is identical as the testing principle detected to power module 12.
Fig. 7 shows a kind of self-checking system of the parallel power module of three level wind electric converters, below by the function in Fig. 7
Rate module 12 is used as power module to be measured, and as example to the self checking method of parallel power module provided by the embodiments of the present application
The expansion process of optional embodiment a kind of be introduced:
As shown in fig. 7, being filled first with preliminary filling electrical circuit to DC bus in the case where switch S1 and S2 disjunction
Electricity, real-time detection DC voltage during the charging process, when DC voltage reaches preset voltage threshold, it is believed that meet self-test item
Part simultaneously disconnects preliminary filling electrical circuit, starts following self-check program:
1) exchange output the switch Q12 and Q22 for controlling power module are closed, so that power module 12 and power module 22
Ac output end links together after dudt circuit.
2) it controls in power module 22 the lower half bridge arm of non-zero level bridge arm (such as the bridge arm in Fig. 7 between DC+ and DC-)
All IGBT start simultaneously at the three-phase alternating current of acquisition power module 12 and power module 22 with first frequency turn-on and turn-off
Stream, if there is the loop current that changes with first frequency at this time, there are short dots by the IGBT for showing inside power module 12；Tool
Body, if there are the loop currents that first frequency changes for A phase, show the IGBT of the zero level bridge arm of the A phase of power module 12
Short circuit occurs；If B phase has the loop current changed with first frequency, show the zero level bridge arm of the B phase of power module 12
IGBT occur short circuit；If C phase has the loop current changed with first frequency, show zero electricity of the C phase of power module 12
Short circuit occurs for the IGBT of level bridge arm.
If being detected as step 2) is normal, that is, appoint in the three-phase alternating current of the power module 12 and power module 22 that acquire
The loop current changed with first frequency is not present in a phase alternating current of anticipating, then continues to examine by subsequent step 3)
It surveys.
3) the zero level bridge arm (bridge arm in such as Fig. 7 between NP point and above-mentioned non-zero level bridge arm) of power module 12 is controlled
In the IGBT of first IGBT bridge arm (an IGBT bridge arm in such as Fig. 7 on zero level bridge arm close to NP) (IGBT electric current is towards electricity
Net direction) with second frequency turn-on and turn-off, and the lower half bridge arm of non-zero level bridge arm in switch motion and power module 22
All IGBT are synchronous, i.e., in power module 12 in zero level bridge arm when the IGBT conducting of first IGBT bridge arm, power module 22
All IGBT of the lower half bridge arm of middle non-zero level bridge arm are similarly on state, and detect the three-phase output of power module 12
The actual current value of electric current.
When non-zero level in the IGBT of first IGBT bridge arm and power module 22 in zero level bridge arm in power module 12
When the IGBT of the lower half bridge arm of bridge arm is similarly on state, it will form circulation flow path (three as shown in dotted portion in Fig. 7
There is independent current path in phase bridge arm, only show a current path therein in Fig. 7 to simplify the explanation), direct current branch
The electric current for supportting capacitor can be by the IGBT of first IGBT bridge arm in zero level bridge arm in power module 12, by power module
12 outputting inductance, then successively by the outputting inductance of switch Q12, switch Q22 and power module 22, then through overpower
The IGBT of the lower half bridge arm of non-zero level bridge arm constitutes circuit in module 22.
In this step, reasonable computation and control turn-on time and preliminary filling can be passed through according to the parameter of converter system
The threshold voltage of electricity, it is ensured that export the peak value of electric current in the permission current range of IGBT.
4) judge whether the actual current value for detecting the three-phase output electric current of power module 12 equal and difference with theoretical value
Whether value is in preset difference range, if it is detected that any phase exports the actual current value and reason of electric current in three-phase output electric current
Exceed preset difference range by the difference of value, then it is believed that first IGBT bridge arm in the zero level bridge arm of power module 12
IGBT there are failure conditions.
The calculation of above-mentioned theory value is as previously mentioned, details are not described herein again.
Fig. 8 shows another self-checking system of the parallel power module of three level wind electric converters, below will be in Fig. 8
Power module 22 is used as power module to be measured, and as example to parallel power module provided by the embodiments of the present application from procuratorial organ
A kind of expansion process of optional embodiment of method is introduced:
In example as shown in Figure 8, is charged to DC bus and judge whether the process and Fig. 7 that meet self-test condition
Shown in example it is identical, details are not described herein again, when meeting self-test condition disconnect preliminary filling electrical circuit, start following self-check program:
1) exchange output the switch Q12 and Q22 for controlling power module are closed, so that power module 12 and power module 22
Ac output end links together after dudt circuit.
2) it controls in power module 12 the upper half bridge arm of non-zero level bridge arm (such as the bridge arm in Fig. 8 between DC+ and DC-)
All IGBT start simultaneously at the three-phase alternating current of acquisition power module 12 and power module 22 with first frequency turn-on and turn-off
Stream, if there is the loop current that changes with first frequency at this time, there are short dots by the IGBT for showing inside power module 22；Tool
Body, if there are the loop currents that first frequency changes for A phase, show the IGBT of the zero level bridge arm of the A phase of power module 22
Short circuit occurs；If B phase has the loop current changed with first frequency, show the zero level bridge arm of the B phase of power module 22
IGBT occur short circuit；If C phase has the loop current changed with first frequency, show zero electricity of the C phase of power module 22
Short circuit occurs for the IGBT of level bridge arm.
If being detected as step 2) is normal, that is, appoint in the three-phase alternating current of the power module 12 and power module 22 that acquire
The loop current changed with first frequency is not present in a phase alternating current of anticipating, then continues to examine by subsequent step 3)
It surveys.
3) the zero level bridge arm (bridge arm in such as Fig. 8 between NP point and above-mentioned non-zero level bridge arm) of power module 22 is controlled
In second IGBT bridge arm (close to an IGBT of the alternating current AC point of non-zero level bridge arm on zero level bridge arm in such as Fig. 8
Bridge arm) IGBT (IGBT electric current towards capacitance direction) with second frequency turn-on and turn-off, and in switch motion and power module 12
All IGBT of the upper half bridge arm of non-zero level bridge arm are synchronous, i.e., second IGBT bridge arm in zero level bridge arm in power module 22
IGBT conducting when, all IGBT of the upper half bridge arm of non-zero level bridge arm are similarly on state in power module 12, and
Detect the actual current value of the three-phase output electric current of power module 22.
When non-zero level in the IGBT of second IGBT bridge arm and power module 12 in zero level bridge arm in power module 22
When the IGBT of the upper half bridge arm of bridge arm is similarly on state, it will form circulation flow path (three as shown in dotted portion in Fig. 8
There is independent current path in phase bridge arm, only show a current path therein in Fig. 8 to simplify the explanation), direct current branch
The electric current for supportting capacitor can be by the IGBT of the upper half bridge arm in non-zero level bridge arm in power module 12, by power module 12
Then outputting inductance passes through power module then successively by the outputting inductance of switch Q12, switch Q22 and power module 22
The IGBT of second IGBT bridge arm in 22 in zero level bridge arm constitutes circuit.
In this step, reasonable computation and control turn-on time and preliminary filling can be passed through according to the parameter of converter system
The threshold voltage of electricity, it is ensured that export the peak value of electric current in the permission current range of IGBT.
4) judge whether the actual current value for detecting the three-phase output electric current of power module 22 equal and difference with theoretical value
Whether value is in preset difference range, if it is detected that any phase exports the actual current value and reason of electric current in three-phase output electric current
Exceed preset difference range by the difference of value, then it is believed that second IGBT bridge arm of the zero level bridge arm of power module 22
There are failure conditions by IGBT.
The calculation of above-mentioned theory value is as previously mentioned, details are not described herein again.
In the example of Fig. 7 and three level blocks wind electric converter shown in Fig. 8, power module 12 in parallel can be made
Different level is exported with power module 22, realizes the alternating inspection to all bridge arms at different voltage levels.For example, first
So that power module 12 is exported DC+ level, the output NP level of power module 22, power module 12 is then made to export NP level, power
Module 22 exports DC- level, and then power module 22 is made to export DC+ level, the output NP level of power module 12, finally makes power
Module 22 exports NP level, power module 12 exports DC- level.
Example based on Fig. 7 and three level blocks wind electric converter shown in Fig. 8, those skilled in the art can manage
Solution, by controlling second IGBT bridge arm of the zero level bridge arm of power module 12 and the non-zero level bridge arm of power module 22
The turn-on and turn-off of middle half bridge arm of correspondence, can be to the failure conditions of second IGBT bridge arm of zero level bridge arm in power module 12
Self-test is carried out, the upper half bridge arm and lower half bridge arm and power module 22 of the non-zero level bridge arm of control power module 12 are passed through
The turn-on and turn-off of half bridge arm of correspondence of middle zero level bridge arm, can non-zero level bridge arm to power module 12 upper half bridge arm and
The failure conditions of lower half bridge arm carry out self-test, and details are not described herein again.
Example based on Fig. 7 and three level blocks wind electric converter shown in Fig. 8, those skilled in the art can manage
Solution, by controlling first IGBT bridge arm of the zero level bridge arm of power module 22 and the non-zero level bridge arm of power module 12
The turn-on and turn-off of middle half bridge arm of correspondence, can be to the failure of first IGBT bridge arm of zero level bridge arm in power power module 22
Situation carries out self-test, passes through the upper half bridge arm and lower half bridge arm and power mould of the non-zero level bridge arm of control power module 22
The turn-on and turn-off of half bridge arm of correspondence of zero level bridge arm in block 12, can non-zero level bridge arm to power module 22 upper half-bridge
The failure conditions of arm and lower half bridge arm carry out self-test, and details are not described herein again.
It is all the same to the principle of the self-check program of power module 12 or power module 22 under each output level.
It in the embodiment of the present application, can also be to the power module 11 and power module in three level block wind electric converters
Any one module in 21 carries out fault detection, and testing principle carries out self-test with to power module 12 and power module 22
Testing principle it is identical.
According to the example of mentioned-above two level blocks wind electric converter and three level block wind electric converters, originally
Field technical staff is appreciated that under the premise of principle is identical, how in power module 11 and the progress failure of power module 21
It is adaptively adjusted during self-test to form corresponding current loop, for example, to power module 11 or power mould
When block 21 carries out automatic fault selftesting, step 1) need to be adjusted to exchange output switch Q11 and the Q21 closure of control power module, make
The ac input end for obtaining power module 11 and power module 21 links together after dudt circuit, for another example, for being formed
Current loop adjustment, be not introduced one by one herein.
In order to improve the efficiency of self-test, the self-test step of power module 11 and power module 21 can be with 12 He of power module
The self-check program of power module 22 carries out simultaneously.
Using the self checking method of parallel power module provided by the embodiments of the present application, at least may be implemented following beneficial to effect
Fruit:
1) structure of the embodiment of the present application based on existing modularization wind electric converter system applies parallel power module
The pulse control signal of certain frequency controls the switch motion of corresponding switching device, to form current loop, and utilizes
The current sensor of modularization wind electric converter system itself detects the electric current of parallel power module, to realize to simultaneously
The fault detection for joining power module, without increasing other circuits in modularization wind electric converter system, in fault detection
The quantity for reducing modularization wind electric converter internal system device, reduces system cost while decreasing system risk
Point improves the fault identification ability to power module on the basis of not increasing system cost.
2) the embodiment of the present application can identify in parallel power module according to the electric current of the parallel power module detected
Failure of removal, compared with the prior art in by output voltage and the mode that is compared of control signal, the embodiment of the present application is not necessarily to
The comparison of signal is carried out, method is simpler easy, and self-test is more efficient.
3) the scheme scope of application in the embodiment of the present application is wider, is applicable not only to modularization wind electric converter system, also
It is applicable to any parallel power module flowed using reactor, such as other types of current transformer, inverter.
Based on the same inventive concept, the embodiment of the present application provides a kind of self-checking unit of parallel power module, is meeting
Self-test step is executed at least one of at least one set of parallel power module power module to be measured when preset self-test condition, such as
Shown in Fig. 9, the self-checking unit 900 of the parallel power module is comprised the following modules: switching device control module 901, current detecting
Module 902 and breakdown judge module 903.
Switching device control module 901, for controlling the first bridge arm in the power module being in parallel with power module to be measured
Switching device with first frequency turn-on and turn-off.
Current detection module 902, for detecting in the circuit that power module to be measured is formed with the power module being in parallel
Three-phase alternating current.
Breakdown judge module 903, for judging in three-phase alternating current with the presence or absence of the circulation electricity changed with first frequency
Stream；If there is the loop current changed with first frequency in three-phase alternating current, it is determined that power module to be measured has short circuit event
Barrier.
Optionally, switching device control module 901 is also used to: when there is no changed with first frequency in three-phase alternating current
Loop current when, control the switching device of the second bridge arm in power module to be measured with second frequency turn-on and turn-off, and
The switching device for controlling the first bridge arm in the power module being in parallel is held on second frequency turn-on and turn-off or
State.
Optionally, current detection module 902 is also used to: detecting the actual current of the three-phase output electric current of power module to be measured
Value；Breakdown judge module 903 is also used to: the theoretical value of the actual current value and three-phase output electric current that judge three-phase output electric current is
It is no consistent；If the theoretical value that three-phase exports the actual current value of electric current and three-phase exports electric current is inconsistent, it is determined that power scale
There are failures for module.
Optionally, switching device control module 901, current detection module 902 and breakdown judge module 903 are used for when to be measured
When power module is more than two, while the two or more power module to be measured at least one set of parallel power module is executed certainly
Examine step.
Optionally, the self-checking unit 900 of parallel power module provided by the embodiments of the present application further include: self-test condition judgement
Module.
Self-test condition judgment module is used for: being held at least one of at least one set of parallel power module power module to be measured
Before row self-test step, when the DC bus connected at least one set of parallel power module charges, direct current is detected
Pressure；Judge whether DC voltage reaches preset voltage threshold, if so, determination meets self-test condition.
The self-checking unit 900 of parallel power module provided by the embodiments of the present application has with mentioned-above embodiment of the method
There are identical inventive concept and identical beneficial effect, is not shown specifically in the self-checking unit 900 of the parallel power module interior
Appearance can refer to mentioned-above embodiment of the method, and details are not described herein.
Based on the same inventive concept, the embodiment of the present application provides a kind of self-checking equipment of parallel power module, such as Figure 10
Shown, the self-checking equipment 1000 of the parallel power module includes: memory 1001 and processor 1002.
It is stored with computer program on memory 1001 in the embodiment of the present application, the computer program is by processor 1002
Execute the self checking method to realize parallel power module provided by the embodiment of the present application.
Memory 1001 in the embodiment of the present application can be ROM (Read-Only Memory, read-only memory) or can
Store static information and instruction other kinds of static storage device, can be RAM (Random Access Memory, with
Machine accesses memory) or the other kinds of dynamic memory of information and instruction can be stored, it is also possible to EEPROM
(Electrically Erasable Programmable Read Only Memory, Electrically Erasable Programmable Read-Only Memory),
CD-ROM (Compact Disc Read-Only Memory, CD-ROM) or other optical disc storages, optical disc storage (including pressure
Contracting optical disc, laser disc, optical disc, Digital Versatile Disc, Blu-ray Disc etc.), magnetic disk storage medium or other magnetic storage apparatus or
Person can be used in the desired program code of carrying or storage with instruction or data structure form and can be by computer access
Any other medium, but not limited to this.
Processor 1002 in the embodiment of the present application can be CPU (Central Processing Unit, central processing
Device), general processor, DSP (Digital Signal Processor, data signal processor), ASIC (Application
Specific Integrated Circuit, specific integrated circuit), FPGA (Field-Programmable Gate
Array, field programmable gate array) either other programmable logic device, transistor logic, hardware component or its
Meaning combination.Its may be implemented or execute combine present disclosure described in various illustrative logic blocks, module and
Circuit.Processor 1002 is also possible to realize the combination of computing function, such as combines comprising one or more microprocessors, DSP
With the combination of microprocessor etc..
Those skilled in the art of the present technique are appreciated that the self-checking equipment of parallel power module provided by the embodiments of the present application
1000 can specially design and manufacture for required purpose, or also may include the known device in general purpose computer.This
A little equipment have the computer program being stored in it, these computer programs are selectively activated or reconstructed.Such calculating
Machine program, which can be stored in equipment (for example, computer) readable medium or be stored in, is suitable for storage e-command and difference
It is coupled in any kind of medium of bus.
The self-checking equipment 1000 of parallel power module provided by the embodiments of the present application has with mentioned-above each embodiment
Identical inventive concept and identical beneficial effect, the content not being shown specifically in the self-checking equipment 1000 of the parallel power module
It can refer to mentioned-above each embodiment, details are not described herein.
Based on the same inventive concept, the embodiment of the present application provides a kind of computer readable storage medium, is stored thereon with
Computer program, the computer program realize oneself of parallel power module provided by the embodiment of the present application when being executed by processor
Detecting method.
The computer-readable medium include but is not limited to any kind of disk (including floppy disk, hard disk, CD, CD-ROM and
Magneto-optic disk), (Erasable Programmable Read-Only Memory, erasable programmable are read-only by ROM, RAM, EPROM
Memory), EEPROM, flash memory, magnetic card or light card.It is, readable medium includes by equipment (for example, computer)
With any medium for the form storage or transmission information that can be read.
Computer readable storage medium provided by the embodiments of the present application, with mentioned-above each embodiment hair having the same
Bright design and identical beneficial effect, the content not being shown specifically in the computer readable storage medium can refer to mentioned-above
Each embodiment, details are not described herein.
Those skilled in the art of the present technique have been appreciated that in the application the various operations crossed by discussion, method, in process
Steps, measures, and schemes can be replaced, changed, combined or be deleted.Further, each with what is crossed by discussion in the application
Kind of operation, method, other steps, measures, and schemes in process may also be alternated, changed, rearranged, decomposed, combined or deleted.
Further, in the prior art to have and the step in various operations disclosed herein, method, process, measure, scheme
It may also be alternated, changed, rearranged, decomposed, combined or deleted.
In the description of the present application, it is to be understood that term " on " and "lower" instruction orientation or positional relationship be base
In orientation or positional relationship shown in the drawings, it is merely for convenience of description of the present invention and simplification of the description, rather than indication or suggestion
Signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as to this
The limitation of invention.
Term " first ", " second " be used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or
Implicitly indicate the quantity of indicated technical characteristic." first " is defined as a result, the feature of " second " can be expressed or imply
Ground includes one or more of the features.In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two or
It is more than two.
It should be understood that although each step in the flow chart of attached drawing is successively shown according to the instruction of arrow,
These steps are not that the inevitable sequence according to arrow instruction successively executes.Unless expressly stating otherwise herein, these steps
Execution there is no stringent sequences to limit, can execute in the other order.Moreover, at least one in the flow chart of attached drawing
Part steps may include that perhaps these sub-steps of multiple stages or stage are not necessarily in synchronization to multiple sub-steps
Completion is executed, but can be executed at different times, execution sequence, which is also not necessarily, successively to be carried out, but can be with other
At least part of the sub-step or stage of step or other steps executes in turn or alternately.
The above is only some embodiments of the application, it is noted that for the ordinary skill people of the art
For member, under the premise of not departing from the application principle, several improvements and modifications can also be made, these improvements and modifications are also answered
It is considered as the protection scope of the application.
Claims (15)
1. a kind of self checking method of parallel power module characterized by comprising
When meeting preset self-test condition, at least one of at least one set of parallel power module power module to be measured
Execute following self-test step:
The switching device for controlling the first bridge arm in the power module being in parallel with the power module to be measured is led with first frequency
Logical and shutdown；
Detect the three-phase alternating current in the circuit that the power module to be measured and the power module being in parallel are formed；
Judge in the three-phase alternating current with the presence or absence of the loop current changed with first frequency；
If there is the loop current changed with first frequency in the three-phase alternating current, it is determined that the power module to be measured is deposited
In short trouble.
2. the method according to claim 1, wherein in the judgement three-phase alternating current with the presence or absence of with
The loop current of first frequency variation, comprising:
Judge whether at least phase alternating current in the three-phase alternating current is the loop current changed with first frequency；
And if there is the loop current changed with first frequency in the three-phase alternating current, it is determined that described to be measured
There are short troubles for power module, comprising:
If at least phase alternating current in the three-phase alternating current is the loop current changed with first frequency, it is determined that institute
Stating the corresponding bridge arm of an at least phase alternating current described in power module to be measured, there are short troubles.
3. the method according to claim 1, wherein
When the parallel power module belongs to two level block wind electric converters, first bridge arm is affiliated power mould
Half bridge arm of any one in block；
When the parallel power module belongs to three level block wind electric converters, first bridge arm is affiliated power module
Any one half bridge arm in middle non-zero level bridge arm, or, first bridge arm is in zero level bridge arm in affiliated power module
Any one IGBT bridge arm.
4. the method according to claim 1, wherein further include:
If controlling the power module to be measured there is no the loop current changed with first frequency in the three-phase alternating current
In the second bridge arm the power module that is in parallel with second frequency turn-on and turn-off, and described in controlling of switching device in first
The switching device of bridge arm is tended to remain on second frequency turn-on and turn-off or；
Detect the actual current value of the three-phase output electric current of the power module to be measured；
Judge whether the actual current value of the three-phase output electric current is consistent with the theoretical value of three-phase output electric current；
If the actual current value of the three-phase output electric current and the theoretical value of three-phase output electric current are inconsistent, it is determined that described
There are failure of removal for power module to be measured.
5. according to the method described in claim 4, it is characterized in that, the actual current value of the judgement three-phase output electric current
It is whether consistent with the theoretical value of three-phase output electric current, comprising:
Whether the difference of the actual current value and the theoretical value that judge the three-phase output electric current is in preset difference range
It is interior；
And if the actual current value of three-phase output electric current and the theoretical value of three-phase output electric current are inconsistent, really
There are failure of removal for the fixed power module to be measured, comprising:
If the difference of the actual current value and the theoretical value that there is at least phase output electric current in the three-phase output electric current is not
In the preset difference range, it is determined that described to be deposited to the corresponding bridge arm of the output electric current of an at least phase described in power module
In failure of removal.
6. according to the method described in claim 4, it is characterized in that,
When the parallel power module belongs to two level block wind electric converters, first bridge arm is affiliated power module
In any one half bridge arm, second bridge arm be affiliated power module in a half-bridge corresponding with first bridge arm
Arm；
When the parallel power module belongs to three level block wind electric converters, first bridge arm is affiliated power module
Any one IGBT bridge arm in middle zero level bridge arm, second bridge arm is in non-zero level bridge arm in affiliated power module
One and half bridge arm corresponding with first bridge arm；Or, first bridge arm is non-zero level bridge arm in affiliated power module
In any one half bridge arm, second bridge arm be in affiliated power module in zero level bridge arm with the first bridge arm phase
A corresponding IGBT bridge arm.
7. described according to the method described in claim 4, it is characterized in that, when the power module to be measured is more than two
Following self-test step is executed at least one of at least one set of parallel power module power module to be measured, comprising:
The self-test is executed to the two or more power module to be measured at least one set of parallel power module simultaneously to walk
Suddenly.
8. described the method according to the description of claim 7 is characterized in that when the power module to be measured is more than two
The switching device for controlling the first bridge arm in the power module that is in parallel with the power module to be measured be connected with first frequency and
Shutdown, including；
The switching device for controlling the first bridge arm in the power module being in parallel with the first power module to be measured is led with first frequency
While logical, the switching device of first bridge arm is with the first frequency in the power module that control is in parallel with the second power module to be measured
Rate shutdown；
And in the control power module to be measured second bridge arm switching device with second frequency turn-on and turn-off,
Include:
While controlling the switching device of the second bridge arm in the first power module to be measured and be connected with second frequency, control second to
The switching device of the second bridge arm is turned off with second frequency in power scale module；
And the switching device of the first bridge arm is connected and is closed with second frequency in the power module being in parallel described in the control
It is disconnected, comprising:
The switching device of first bridge arm is with the second frequency in the power module that control is in parallel with the described first power module to be measured
While rate is connected, the switching device for controlling the first bridge arm in the power module being in parallel with the described second power module to be measured is equal
It is turned off with second frequency；
And first power module to be measured and second power module to be measured are more than two power modules to be measured
In adjacent two power modules to be measured.
9. the method according to claim 1, wherein it is described at least one set of parallel power module extremely
A few power module to be measured executes before following self-test step, further includes:
When the DC bus connected at least one set of parallel power module charges, DC voltage is detected；
Judge whether the DC voltage reaches preset voltage threshold, if so, determination meets the self-test condition.
10. a kind of self-checking unit of parallel power module, which is characterized in that when meeting preset self-test condition at least one set
At least one of parallel power module power module to be measured executes self-test step；The self-checking unit includes with lower die
Block:
Switching device control module, for controlling opening for the first bridge arm in the power module being in parallel with the power module to be measured
Device is closed with first frequency turn-on and turn-off；
Current detection module, for detecting in the circuit that the power module to be measured and the power module being in parallel are formed
Three-phase alternating current；
Breakdown judge module, for judging in the three-phase alternating current with the presence or absence of the loop current changed with first frequency；
If there is the loop current changed with first frequency in the three-phase alternating current, it is determined that there are short for the power module to be measured
Road failure.
11. device according to claim 10, which is characterized in that the switching device control module is also used to: when described
There is no when the loop current changed with first frequency in three-phase alternating current, the second bridge arm in the power module to be measured is controlled
The power module that is in parallel with second frequency turn-on and turn-off, and described in controlling of switching device in the first bridge arm switch
Device is tended to remain on second frequency turn-on and turn-off or；
And the current detection module is also used to: the actual current of the three-phase output electric current of the detection power module to be measured
Value；
And the breakdown judge module is also used to: judging that the actual current value of the three-phase output electric current and the three-phase are defeated
Whether the theoretical value of electric current is consistent out；If the actual current value of the three-phase output electric current and the theory of three-phase output electric current
It is worth inconsistent, it is determined that there are failure of removal for the power module to be measured.
12. device according to claim 11, which is characterized in that the switching device control module, the current detecting
Module and the breakdown judge module are used for when the power module to be measured is more than two, while described at least one set simultaneously
Join the power module to be measured of the two or more in power module and executes the self-test step.
13. device according to claim 10, which is characterized in that further include: self-test condition judgment module；
The self-test condition judgment module is used for: at least one of at least one set of described parallel power module to power scale mould
Before block executes the self-test step, charge in the DC bus connected at least one set of parallel power module
When, detect DC voltage；Judge whether the DC voltage reaches preset voltage threshold, if so, determining that satisfaction is described certainly
Inspection condition.
14. a kind of self-checking equipment of parallel power module characterized by comprising memory and processor, the memory are deposited
Computer program is contained, the computer program is executed as the processor to realize as described in any one of claims 1 to 9
Parallel power module self checking method.
15. a kind of computer readable storage medium, which is characterized in that be stored with computer program, the computer program is located
Reason device realizes the self checking method of parallel power module described in any one of claims 1 to 9 when executing.
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| CN110308347A (en) * | 2019-07-02 | 2019-10-08 | 西门子（上海）电气传动设备有限公司 | The self-test of frequency converter and review one's lessons by oneself positive system, method and frequency converter |
| CN112003244A (en) * | 2020-07-31 | 2020-11-27 | 深圳市禾望电气股份有限公司 | Fault pre-judging method and system for power module |
| CN112448425A (en) * | 2019-08-30 | 2021-03-05 | 比亚迪股份有限公司 | Fault processing method, system and storage medium thereof |
| CN114325287A (en) * | 2022-01-04 | 2022-04-12 | 深圳市永联科技股份有限公司 | Power MOS manages fault detection's circuit |
| CN115097277A (en) * | 2022-06-20 | 2022-09-23 | 南方电网科学研究院有限责任公司 | Atmospheric neutron accelerated irradiation test method for flexible direct current converter valve power unit |
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