CN103399228B - The total power burn in test circuit of current transformer or frequency converter - Google Patents
The total power burn in test circuit of current transformer or frequency converter Download PDFInfo
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- CN103399228B CN103399228B CN201310325114.9A CN201310325114A CN103399228B CN 103399228 B CN103399228 B CN 103399228B CN 201310325114 A CN201310325114 A CN 201310325114A CN 103399228 B CN103399228 B CN 103399228B
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Abstract
The total power burn in test circuit that the embodiment of the invention discloses a kind of current transformer or frequency converter, comprises filter reactor and step-up transformer, and the dc source being communicated with the two ends of bus capacitor; The input of step-up transformer is communicated with the output of three-phase inverter via filter reactor, and its output is communicated with the input of three-phase rectifier; Total power burn in test circuit also comprises the burn-in test module being arranged in controller and is arranged at the burn-in test trigger element on human interface device; Burn-in test trigger element is for controlling the running status of burn-in test module; Burn-in test module is used for controlling current transformer or frequency converter carries out burn-in test. The present invention can effectively reduce the energy loss in burn-in test process, and has simplified the structure of test macro, has reduced system maintenance cost.
Description
Technical field
The present invention relates to current transformer or converter technology, relate in particular to the total power of a kind of current transformer or frequency converterBurn in test circuit.
Background technology
The manufacturer of current transformer or frequency converter, before its product export, need be tested its various performances.Burn-in test is exactly the electrical feature oepration at full load of simulation actual loading, to test current transformer or frequency converterInverter, drive circuit etc. Total power burn-in test is very heavy in current transformer or frequency converter reliability testingA ring of wanting, especially for current transformer and the frequency converter of high-power. Adopt at present more high-power changeThe total power burn in test circuit of stream device or frequency converter is mainly divided three classes.
The patent of invention of application number CN201220260394.0 has provided first kind total power burn in test circuit,As shown in Figure 1, the output of current transformer (or frequency converter) connects asynchronous machine as load, at asynchronous electricityAfter machine, can further connect the device such as generator, flywheel, will test power back off in electrical network, transformConsume for the kinetic energy of flywheel or by generator resistance heating. The energy consumption of this class burn in test circuit is higher.In test circuit, by generator, electric energy feedback is arrived to electrical network, because intermediate link is too much, cause electric energy to existIn intermediate link consume larger, the ratio that can feed back to electrical network is less. In addition, some groups of electricity need to be setMachine, system complex, floor space is large, and cost is high. And, adopt asynchronous machine to do load, equipment easily grindsDamage, maintenance cost is high, and mechanicalness noise is large simultaneously.
The patent of invention of application number CN200710123594.5 has provided Equations of The Second Kind total power burn in test circuit,As shown in Figure 2, the output of current transformer (or frequency converter) connects real electrical machinery power factor (PF) (0.8 left and right)Resistance reactance as load, described current transformer is worked under the test mode that is similar to actual working state,The dc-link capacitance of high inductive load and current transformer (or frequency converter) is realized controlled energy by reactive powerMove in circles. The energy consumption of this class testing circuit is also higher, and the electric energy in system all consumes negativeIn live resistance. And resistance heating is serious, in the time that power is larger, need to increase extra heat abstractor.
The patent of invention of application number CN201210407764.3 has provided the 3rd class total power burn in test circuit,As shown in Figure 3, the output of current transformer (or frequency converter) is connected to unsteady flow by the grid-connected reactor increasingThe input of device (or frequency converter), then access electrical network. Wherein, additional control module to line voltage withAnd the output current of current transformer (or frequency converter) samples, and it is processed, control current transformer (orFrequency converter) output pulse, by energy feedback to electrical network. This class testing circuit passes through sampling output current,And it is processed, control current transformer (or frequency converter) output pulse, by grid-connected reactor by energyAmount feeds back to electrical network, compares the first kind and Equations of The Second Kind circuit and all greatly reduce the consumption of energy. But unsteady flowWhen device is aging, need to increase extra sampling and grid-connected control module, output current control algolithm relative complex.And owing to there is the problem of switch subharmonic circulation on main circuit, grid-connected reactor often needs to select greatlyr.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, for current transformer in prior art or frequency converterThe high or defect of system complex of the large cost of total power burn in test circuit power consumption, provideA total power burn in test circuit for frequency converter or current transformer, can save energy, reduces harmonic circulating current, andWith low cost, simple in structure.
In order to solve the problems of the technologies described above, the embodiment of the present invention provides the full merit of a kind of current transformer or frequency converterRate burn in test circuit, described current transformer or frequency converter comprise bus capacitor, controller and respectively with describedThree-phase rectifier, three-phase inverter and human interface device that controller communication is connected, described three-phase rectifierTwo outputs be connected with two inputs of described three-phase inverter, described in described bus capacitor is connected toBetween two outputs of three-phase rectifier, described controller comprises for controlling described current transformer or frequency converterThe standard control module of normal operation, described total power burn in test circuit comprise be arranged at described current transformer orThe filter reactor of frequency converter outside and step-up transformer, and be communicated with the two ends of described bus capacitor straightStream power supply; The input of described step-up transformer is defeated via described filter reactor and described three-phase inverterGo out end and be communicated with, the output of described step-up transformer is communicated with the input of described three-phase rectifier; Described completePower aging test circuit also comprises the burn-in test module being arranged in described controller and is arranged at described peopleBurn-in test trigger element on machine interface equipment; Described burn-in test trigger element is communicated by letter with described controllerBe connected, for controlling the running status of described burn-in test module; Described burn-in test module and described filteringReactor is connected with described step-up transformer communication, carries out aging survey for controlling described current transformer or frequency converterExamination; On described human interface device, be provided with for controlling current transformer or frequency converter and carry out corresponding control programInterface.
In total power burn in test circuit of the present invention, described dc source is direct current network.
In total power burn in test circuit of the present invention, described dc source comprise be connected in series threeCross streams electrical network and phase controlled rectifier, described three-phase alternating current electrical network is via described phase controlled rectifier and described busElectric capacity is communicated with.
In total power burn in test circuit of the present invention, described dc source comprise be connected in series threeCross streams electrical network and pulse rectifier, described three-phase alternating current electrical network is via described pulse rectifier and described busElectric capacity is communicated with.
In total power burn in test circuit of the present invention, described burn-in test trigger element is button.
In total power burn in test circuit of the present invention, described burn-in test trigger element is touch-screen.
In total power burn in test circuit of the present invention, described filter reactor comprises three inductance,Each inductance is communicated with an output of described three-phase inverter respectively.
In total power burn in test circuit of the present invention, described step-up transformer comprise primary coil andSecondary coil, three inputs of primary coil are communicated with three inductance respectively, three of described secondary coilOutput is communicated with three inputs of described three-phase rectifier respectively.
Implement the embodiment of the present invention, there is following beneficial effect: by by the mother of tested current transformer or frequency converterLine connects dc source, and by the reactor connection after filtering of the output of inverter in current transformer or frequency converterTo step-up transformer, other one end of step-up transformer is connected to the input of rectifier in current transformer or frequency converterEnd, forming energy circulation, does not have the energy dissipation devices such as motor, can effectively reduce the energy in burn-in test processLoss; Directly utilize controller intrinsic in frequency converter or current transformer, in intrinsic controller, increase independentlyBurn-in test program, without increasing the extra hardware circuit such as sample circuit, control module; The utilization change of boostingDepressor can effectively reduce the ripple current in test loop, with respect to the scheme that adopts isolating transformer, and canReduce the impact of loop ripple current on burn-in test; The structure of having simplified test macro, thereby reduced isSystem maintenance cost, without considering heat radiation, can not produce noise, has increased testing reliability.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will be to implementingIn example or description of the Prior Art, the accompanying drawing of required use is briefly described, and apparently, the following describesIn accompanying drawing be only some embodiments of the present invention, for those of ordinary skill in the art, do not payingGo out under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic diagram of first kind total power burn in test circuit in prior art;
Fig. 2 is the schematic diagram of Equations of The Second Kind total power burn in test circuit in prior art;
Fig. 3 is the schematic diagram of the 3rd class total power burn in test circuit in prior art;
Fig. 4 is the schematic diagram of the total power burn in test circuit that provides of first embodiment of the invention;
Fig. 5 is the schematic diagram of the total power burn in test circuit that provides of second embodiment of the invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearlyChu, intactly description, obviously, described embodiment is only the present invention's part embodiment, instead ofWhole embodiment. Based on the embodiment in the present invention, those of ordinary skill in the art are not making creationThe every other embodiment obtaining under property work prerequisite, belongs to the scope of protection of the invention.
Current transformer or frequency converter generally include bus capacitor, controller and communicate by letter and be connected with controller respectivelyThree-phase rectifier, three-phase inverter and human interface device, the current transformer wherein having or frequency converter only comprise wholeStream device and inverter one of them. In controller, generally include for controlling this current transformer or frequency converter and normally transportThe standard control module of row, for example, is provided with conventionally for controlling change on human interface device (control panel)Stream device or frequency converter are carried out the interface of corresponding control program, for example " standardization program key ". When user presses " markQuasi-ordering key " time, current transformer or frequency converter enter its Standard Control Procedure, and normally operation, realizes current transformerOr the inherent function of frequency converter.
The present invention is only for the current transformer or the frequency converter that comprise three-phase rectifier and three-phase inverter simultaneously. As Fig. 4Shown in, current transformer or frequency converter 6 comprise bus capacitor 3, controller 1 and the phase of communicating by letter with controller 1 respectivelyThe three-phase rectifier 4, three-phase inverter 5 and the human interface device 2 that connect. Two outputs of three-phase rectifier 4End is connected with two inputs of three-phase inverter 5, and bus capacitor 3 is connected to two of three-phase rectifier 4Between output. Controller 1 comprises the standard control for controlling this current transformer or frequency converter 6 normal operationsModule 101, particularly, standard control module 101 and three-phase rectifier 4, three-phase inverter 5 and man-machineInterface equipment 2 communications are connected. Wherein, the electric wire that the two ends of bus capacitor 3 are connected is called bus, motherLine capacitance 3 is for supporting bus voltage. Three-phase rectifier 4 both can be the not control rectifying circuit that adopts diode,Also can be adopt IGBT (InsulatedGateBipolarTransistor, insulated gate bipolar transistor) canControl rectifying circuit.
As shown in Figure 4, total power burn in test circuit comprises the filter that is arranged at current transformer or frequency converter 6 outsidesWave reactor 7, step-up transformer 8 and dc source 9, the two ends of bus capacitor 3 are communicated with dc source 9,The input of step-up transformer 8 is communicated with the output of three-phase inverter 5 via filter reactor 7, boostsThe output of transformer 8 is communicated with the input of 4 three-phase rectifiers. Total power burn in test circuit also comprisesBe arranged at the burn-in test module 102 in controller 1 and be arranged at the burn-in test on human interface device 2Trigger element 201. 1 communication of burn-in test trigger element 201 and controller be connected (in a specific embodiment,Be connected with burn-in test module 102 communications in controller 1), for controlling the fortune of burn-in test module 102Row state. 8 communications are connected (at one burn-in test module 102 with step-up transformer with filter reactor 7In specific embodiment, be also connected with three-phase rectifier 4, three-phase inverter 5 communications), for controlling current transformerOr frequency converter carries out burn-in test. Human interface device 2 can be mounted on current transformer or shell of frequency converterControl panel, can be also external keyboard, burn-in test trigger element can be button, touch-screen etc.User's operated device.
Filter reactor 7 can reduce the switching harmonics electric current in test loop, reduces the change of boosting of its rear endThe loss of depressor 8 and heating. Step-up transformer 8 can lift three-phase inverter 5 output voltage, then willThe output voltage promoting passes to three-phase rectifier 4, forming energy self-loopa. If there is no step-up transformer 8,At three-phase rectifier 4 during for control rectifying circuit not, cannot forming energy circulation.
If three-phase rectifier 4 is the controlled rectification circuits that comprise IGBT, in burn-in test process, aging surveyDie trial piece 102 can regulate by the modulation ratio and the phase place that regulate three-phase rectifier 4 and three-phase inverter 5It exports pulse, and the electric energy that makes to be added on dc bus flows to filter reactor 7 Hes by three-phase inverter 5Step-up transformer 8, flows into three-phase rectifier 4, finally flows back to dc bus, realizes moving in circles of energy.Burn-in test module 102 can also be wide by the output pulse of control three-phase rectifier 4 and three-phase inverter 5Degree carrys out the size of controlled circulation electric current.
If three-phase rectifier is the not control rectifying circuit that comprises diode, in burn-in test process, aging surveyDie trial piece only need be by regulating the modulation of three-phase inverter 5 recently to regulate its output pulse, i.e. adjustable three-phaseThe output voltage of inverter 5, and then the size of controlled circulation electric current, without extra electric current and voltage sampling electricityRoad, three-phase inverter and control element.
For example, burn-in test module 102 can be utilized SPWM (SinusoidalPulseWidthModulation, sinusoidal pulse width modulation) or SVPMW (SpaceVectorPulseWidthModulation,Space vector pulse width modulation) method, control output pulse by amplitude and the phase place of controlling reference sine waveSize. User can select to enter burn-in test by human interface device 2, and wherein man-machine interface is establishedEach interface on standby 2 all has a function number, and each function is number corresponding to one section of journey in controller 1Order, in the time that controller detects function, calls corresponding program. For example,, at the embodiment shown in Fig. 4In, user triggers burn-in test trigger element 201, burn-in test module 102 brings into operation, like this withoutProgramming burn-in test program again in the time of each test. After burn-in test completes, user can choice criteria journeyOrder unit, brings into operation standard control module 101, or in the time there is no standardization program unit, standard controlMolding piece 101 can bring into operation in the time that burn-in test trigger element 201 resets.
In burn-in test process, access the voltage of the dc source of bus by adjustment, can realize different electricityPress the current transformer of grade or the burn-in test of inverter.
In test process, the electric energy obtaining from electrical network, loss is mainly distributed in auxiliary rectifier, filtered electricalAnti-device 7 and step-up transformer 8, the energy loss in these modules accounts for 10% left and right of system power. ItsIn the main loss module loss that is tested system, therefore can effectively save energy.
The total power burn in test circuit that the embodiment of the present invention provides, only for separate unit high-power converter or changeFrequently device, current transformer or frequency converter comprise three-phase rectifier 4 and 5 two power section of three-phase inverter, pass throughThe bus of tested current transformer or frequency converter is connected to dc source, and by the output of three-phase inverter after filtrationWave reactor is connected to step-up transformer, and other one end of step-up transformer is connected to the input of three-phase rectifierEnd, forming energy circulation, does not have the energy dissipation devices such as motor, can effectively reduce the energy in burn-in test processLoss; Directly utilize controller intrinsic in frequency converter or current transformer, in intrinsic controller, increase independentlyBurn-in test program, without increasing the extra hardware circuit such as sample circuit, control module; The utilization change of boostingDepressor can effectively reduce the ripple current in test loop, with respect to the scheme that adopts isolating transformer, and canReduce the impact of loop ripple current on burn-in test; The structure of having simplified test macro, thereby reduced isSystem maintenance cost, without considering heat radiation, can not produce noise, has increased testing reliability.
Wherein, dc source can be directly direct current network. But, because civil power is three-phase alternating current electrical network,Therefore conventionally connect rectifier so that DC voltage to be provided at the output of three-phase alternating current electrical network. As shown in Figure 5,Dc source 9 comprises the three-phase alternating current electrical network and the rectifier that are connected in series, and three-phase alternating current electrical network is via rectifierBe communicated with bus capacitor 3. Wherein, rectifier can be phase controlled rectifier or pulse rectifier.
Fig. 5 is another reality of the total power burn in test circuit of current transformer provided by the invention or frequency converter 6Execute routine schematic diagram, for more succinctly clear, controller 1 and human interface device 2 are not shown in Fig. 5.
Preferably, as shown in Figure 5, filter reactor 7 comprises three inductance, each inductance respectively with three-phaseAn output of inverter is communicated with.
Preferably, as shown in Figure 5, step-up transformer 8 comprises primary coil and secondary coil, primary coilThree inputs be communicated with three inductance respectively, three outputs of secondary coil respectively with three-phase rectifierThree inputs be communicated with.
One of ordinary skill in the art will appreciate that all or part of flow process realizing in above-described embodiment method,Be can carry out the hardware that instruction is relevant by computer program to complete, described program can be stored in a calculatingIn machine read/write memory medium, this program, in the time carrying out, can comprise as the flow process of the embodiment of above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-OnlyMemory,Or random store-memory body (RandomAccessMemory, RAM) etc. ROM).
Above disclosed only for a kind of preferred embodiment of the present invention, certainly can not limit this with thisBright interest field, one of ordinary skill in the art will appreciate that all or part of stream of realizing above-described embodimentJourney, and the equivalent variations of doing according to the claims in the present invention, still belong to the scope that invention is contained.
Claims (8)
1. a total power burn in test circuit for current transformer or frequency converter, described current transformer or frequency converter compriseBus capacitor, controller and respectively with described controller the communicate by letter three-phase rectifier, the three-phase inverter that are connectedAnd human interface device, two inputs of two outputs of described three-phase rectifier and described three-phase inverterEnd is connected, and described bus capacitor is connected between two outputs of described three-phase rectifier, described controllerComprise the standard control module for controlling the normal operation of described current transformer or frequency converter, it is characterized in that instituteState total power burn in test circuit and comprise the filter reactor and the liter that are arranged at described current transformer or frequency converter outsidePressure transformer, and the dc source being communicated with the two ends of described bus capacitor; Described step-up transformer defeatedEnter end and be communicated with the output of described three-phase inverter via described filter reactor, described step-up transformerOutput is communicated with the input of described three-phase rectifier; Described total power burn in test circuit also comprises settingBurn-in test module in described controller and the burn-in test being arranged on described human interface device triggerUnit; Described burn-in test trigger element is communicated by letter and is connected with described controller, for controlling described burn-in testThe running status of module; Described burn-in test module is communicated by letter with described step-up transformer with described filter reactorBe connected, carry out burn-in test for controlling described current transformer or frequency converter; On described human interface device, arrangeBe useful on control current transformer or frequency converter and carry out the interface of corresponding control program.
2. total power burn in test circuit as claimed in claim 1, is characterized in that, described dc sourceFor direct current network.
3. total power burn in test circuit as claimed in claim 1, is characterized in that, described dc sourceComprise the three-phase alternating current electrical network and the phase controlled rectifier that are connected in series, described three-phase alternating current electrical network is via described phasedRectifier is communicated with described bus capacitor.
4. total power burn in test circuit as claimed in claim 1, is characterized in that, described dc sourceComprise the three-phase alternating current electrical network and the pulse rectifier that are connected in series, described three-phase alternating current electrical network is via described pulseRectifier is communicated with described bus capacitor.
5. total power burn in test circuit as claimed in claim 1, is characterized in that, described burn-in testTrigger element is button.
6. total power burn in test circuit as claimed in claim 1, is characterized in that, described burn-in testTrigger element is touch-screen.
7. the total power burn in test circuit as described in any one in claim 1-6, is characterized in that, instituteState filter reactor and comprise three inductance, each inductance connects with an output of described three-phase inverter respectivelyLogical.
8. total power burn in test circuit as claimed in claim 7, is characterized in that, described in the transformation of boostingDevice comprises primary coil and secondary coil, and three inputs of primary coil are communicated with three inductance respectively, instituteThree outputs stating secondary coil are communicated with three inputs of described three-phase rectifier respectively.
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| CN102074971A (en) * | 2010-12-14 | 2011-05-25 | 东莞市冠佳电子设备有限公司 | Feedback load energy-saving circuit for aging test and control method thereof |
| TW201326860A (en) * | 2011-12-23 | 2013-07-01 | Delta Electronics Shanghai Co | A load test system for an inverter |
Cited By (1)
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| CN108614168A (en) * | 2016-12-12 | 2018-10-02 | 北京天诚同创电气有限公司 | Generating field current transformer total power test method |
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