CN204967283U - Virtual load of formula alternating current -direct current can be presented to three -phase four -wire - Google Patents

Virtual load of formula alternating current -direct current can be presented to three -phase four -wire Download PDF

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Publication number
CN204967283U
CN204967283U CN201520597141.6U CN201520597141U CN204967283U CN 204967283 U CN204967283 U CN 204967283U CN 201520597141 U CN201520597141 U CN 201520597141U CN 204967283 U CN204967283 U CN 204967283U
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China
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phase
load
line
brachium pontis
bus
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Expired - Fee Related
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CN201520597141.6U
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Chinese (zh)
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游菲
袁旭峰
邹晓松
熊炜
胡晟
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Guizhou University
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Guizhou University
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Abstract

The utility model discloses a virtual load of formula alternating current -direct current can be presented to three -phase four -wire, include the load transverter of compriseing three single -phase transverters, an inlet wire of every single -phase transverter is connected a phase line of test equipment leading -out terminal, another inlet wire is connected on being qualified for the next round of competitions and being qualified for the next round of competitions, the neutral conductor of test equipment leading -out terminal, the upper end of three single -phase transverters all be equipped with load side direct current breaker with the lower extreme to article three, be qualified for the next round of competitions and join for anodal dc bus in the upper end, and three lower extremes are qualified for the next round of competitions and are joind for the negative pole dc bus, and positive and negative dc bus returns and links AC electric network via presenting the transverter. The utility model discloses can realize the simulation to constant current, permanent power, constant -resistance multiple loadtype alternating load such as anti and direct current load to with above -mentioned direct current contravariant for the alternating current repayment to the electric wire netting in, but have energy -efficient, on a large scale, the advantage of high accuracy continuously adjustable load, great spreading value and economic value have.

Description

A kind of three-phase and four-line can present formula alternating current-direct current dummy load
Technical field
The utility model relates to a kind of three-phase and four-line can present formula alternating current-direct current dummy load, belongs to electron electric power and electric power system applied technical field.
Background technology
Along with Development of Power Electronic Technology, various power supply product, energy-conservation power supplying and distributing equipment, Event tourism equipment etc. are widely used, electric equipment performance and efficiency evaluation and test all need to carry out band and carry test, the mode that traditional test load often adopts RLC impedance load case to carry out energy consumption electric discharge is carried out, this method not only measuring accuracy is low, and cause the huge waste of electric energy, and there is following shortcoming:
One, load adopts has level to regulate, and when needs resistance value consecutive variations or its load form change flexibly, is difficult to meet the requirement that electric equipment regulates continuously to different operating mode;
Two, power is less, under long-time cranking test environment, easily cause the aging of device and scaling loss;
Three, poor heat stability, when the environmental temperature is changed, load also can change;
Four, its load form is single, can not meet in electric equipment test the requirement that load capacity, power factor, tri-phase unbalance factor and harmonic wave etc. dynamically regulate continuously;
Five, test power consumption on resistance, cause huge energy waste.
Therefore, tradition power consumption test load is not ideal enough, cannot meet the requirement that band carries test.
Summary of the invention
The purpose of this utility model is: provide a kind of three-phase and four-line can present formula alternating current-direct current dummy load, to be realized the simulation to the multiple loadtype AC load such as constant current, invariable power, constant-impedance and DC load by transformation of electrical energy, and be that alternating current feeds back to electrical network by above-mentioned DC inverter, reach energy-conservation object.
The technical solution of the utility model: a kind of three-phase and four-line can present formula alternating current-direct current dummy load, for testing the performance of the testing equipment be connected in AC network and efficiency, comprise the load current-change device be made up of three single-phase inverters, an inlet wire of every platform single-phase inverters connects a phase line of described testing equipment leading-out terminal, another inlet wire connects the neutral line of described testing equipment leading-out terminal, the upper end outlet of three single-phase inverters and lower end outlet are equipped with load-side DC circuit breaker, and three upper end outlet converges for positive DC bus, article three, lower end outlet converges for negative DC bus, positive and negative DC bus returns link in AC network via presenting converter.
Said system, load current-change device is formed in parallel by three identical single-phase inverters of structure, by controlling the on off operating mode of each load-side DC circuit breaker, can realize three single-phase inverters accesses or excision system, change the on off operating mode of device for power switching IGBT in single-phase inverters simultaneously, single-phase inverters can be changed for Boost circuit, making system converting is direct current dummy load, can to constant current, invariable power, the multiple loadtype AC load such as constant-impedance and DC load realize simulation, it is that alternating current feeds back in electrical network by above-mentioned DC inverter that recycling can present converter, realize the feedback of energy, the switching loss in each converter is mainly at this procedures system consumed energy, loss electric energy is little, thus save electric energy.
Described single-phase inverters comprises two brachium pontis parallel with one another, the upper parallel connected end of two brachium pontis converges the upper end outlet for single-phase inverters, the lower parallel connected end of two brachium pontis converges the lower end outlet for single-phase inverters, each brachium pontis forms by two anti-paralleled diode device for power switching serial connections, the middle part lead-out wire of one of them brachium pontis connects a phase line of described testing equipment leading-out terminal by reactor, the middle part lead-out wire of another brachium pontis connects the neutral line of described testing equipment leading-out terminal, and in the upper end outlet of described single-phase inverters, DC capacitor is connected with between the outlet of lower end.
Described converter of presenting comprises two capacitors be connected in series between positive and negative DC bus, and three single-phase brachium pontis be connected in parallel between positive and negative DC bus, each single-phase brachium pontis comprises four anti-paralleled diode device for power switching be connected in series successively and two clamping diodes be serially connected, be positioned at two anti-paralleled diode device for power switching in the middle part of single-phase brachium pontis and described two clamping diodes are in parallel, the middle part line of two clamping diodes on each single-phase brachium pontis is all connected with the middle part line of described two capacitors, the middle part line of two anti-paralleled diode device for power switching in the middle part of three single-phase brachium pontis draws A phase line respectively, B phase line, C phase line, and respectively via A phase reactor, B phase reactor, C phase reactor returns and is connected in AC network.
Also be provided with between described positive and negative DC bus mutually series connection can present side DC circuit breaker, charging resistor and another can present side DC circuit breaker.
Owing to adopting technique scheme, the utility model has the advantage of: the utility model is not only simple and reasonable for structure, and use three single-phase inverters as load current-change device, by transformation of electrical energy and change single-phase inverters operating state not only can analog AC three-phase equilibrium, three-phase imbalance load, also can analog DC load; Converter can be presented simultaneously and adopt three level diode clamp formula voltage source converter, electric energy feedback electrical network is achieved efficiently by transformation of electrical energy, compared with two level converters, it is less that three-level converter inversion produces harmonic wave contained by alternating current, and waveform more levels off to sine wave.Compared to tradition power consumption test load, the utility model have energy-efficient, on a large scale, high accuracy, can the advantage of regulating load continuously, there is larger promotional value and economic worth.
Accompanying drawing explanation
Fig. 1 is this System's composition figure of the present utility model;
Fig. 2 is the main circuit topological structure schematic diagram exchanging dummy load;
Fig. 3 is the schematic diagram of direct current dummy load.
Embodiment
In order to make the utility model object, technical scheme and advantage clearly, below in conjunction with drawings and Examples, the utility model is described in further detail.
Embodiment 1
See Fig. 1 and Fig. 2, for the utility model structural representation, this three-phase and four-line can be presented formula alternating current-direct current dummy load and mainly comprises load current-change device LC and can present converter FC, and load current-change device is three single-phase electricity Source Con-verters, and can present converter is three level diode clamp formula voltage source converter.
In the utility model, the device for power switching comprising anti-paralleled diode is called anti-paralleled diode device for power switching, and selects IGBT(InsulatedGateBipolarTransistor, insulated gate bipolar transistor).
Below first to load current-change device LC of the present utility model with converter FC can be presented be described.
Load current-change device LC comprises the identical converter of three phase structures, and every platform single-phase inverters main circuit includes device for power switching IGBT (the i.e. S that four groups comprise anti-paralleled diode lC1~ S lC2), reactor L lC, direct current capacitor C lC.Device for power switching IGBTS lC1, S lC2form a brachium pontis of single-phase inverters contained by load current-change device FC, device for power switching IGBTS lC3, S lC4form another brachium pontis, wherein device for power switching IGBTS lC1, S lC2middle part lead-out wire be A phase line, A phase line serial connection reactor L lC, device for power switching IGBTS lC3, S lC4middle part lead-out wire be N line.DC capacitor C lCbe in parallel with two brachium pontis.
Three above-mentioned single-phase inverters are in parallel and form load current-change device LC, and the brachium pontis upper end outlet of three single-phase inverters is connected in series DC switch circuit breaker K respectively a1, K b1, K c1, then three-phase is connected, and form a DC bus of system dc side, the brachium pontis lower end outlet of three single-phase inverters is connected in series DC switch circuit breaker K respectively a2, K b2, K c2, then three-phase is connected, and forms another DC bus of system dc side, is connected to the DC circuit breaker K be in series between the positive and negative DC bus in system dc side c1, charging resistor R cwith DC circuit breaker K c2.
Side converter main circuit can be presented and comprise device for power switching IGBT (the i.e. S that 12 groups comprise anti-paralleled diode a1~ S a4, S b1~ S b4, S c1~ S c4), six groups of clamping diode (i.e. D a1, D a2, D b1, D b2, D c1, D c2), three outlet reactor (i.e. L a, L b, L c), two direct current capacitor (C fC1, C fC2).Every four groups of device for power switching are in series (i.e. S a1~ S a4, S b1~ S b4, S c1~ S c4)), form A phase brachium pontis, B phase brachium pontis, the C phase brachium pontis that can present side converter FC respectively, and be connected between the both positive and negative polarity DC bus of system dc side, and two groups of DC capacitor C fC1, C fC2be in parallel with three-phase brachium pontis after being in series.Clamping diode D a1, D a2be in series, upper end and device for power switching IGBTS a1, S a2middle part lead-out wire be connected, lower end and device for power switching IGBTS a3, S a4middle part lead-out wire be connected; Clamping diode D b1, D b2be in series, upper end and device for power switching IGBTS b1, S b2middle part lead-out wire be connected, lower end and device for power switching IGBTS b3, S b4middle part lead-out wire be connected; Clamping diode D c1, D c2be in series, upper end and device for power switching IGBTS c1, S c2middle part lead-out wire be connected, lower end and device for power switching IGBTS c3, S c4middle part lead-out wire be connected.Clamping diode D c1, D c2series connection mid point lead-out wire meets clamping diode D b1, D b2mid point and D a1, D a2mid point, is finally connected to direct current capacitor C fC1, C fC2on series connection mid point.Device for power switching IGBTS a2, S a3middle part lead-out wire after series connection is A phase line, A phase line serial connection A phase reactor L aafter get access to grid, device for power switching IGBTS b2, S b3middle part lead-out wire after series connection is B phase line, B phase line serial connection B phase reactor L bafter get access to grid, device for power switching IGBTS c1, S c2middle part lead-out wire after series connection is C phase line, C phase line serial connection C phase reactor L cafter get access to grid.
embodiment 2
See accompanying drawing 3, be schematic diagram when system transition of the present utility model is direct current dummy load, system main circuit collection of illustrative plates structure see embodiment 1 accompanying drawing 2, by the DC switch circuit breaker K of the A phase single-phase inverters in control load converter LC a1, K a2closed, by the A phase single-phase inverters connecting system in load current-change device LC, the DC switch circuit breaker K of B, C phase single-phase inverters simultaneously in control load converter LC b1, K b2, K c1, K c2disconnect, by B, C phase single-phase inverters excision system in load current-change device LC, control A phase single-phase inverters device for power switching IGBTS lC1, S lC3permanent shutoff, S lC4permanent conducting, S lC2for Systematical control controlled switching devices, namely direct current dummy load schematic diagram as shown in Figure 3 can be obtained, it becomes a boost circuit, regulate input current instruction, the test to DC test power supply can be completed, d-c bus voltage value still regulates by presenting converter FC, to ensure complete machine energy balance.
The utility model uses three single-phase inverters as load current-change device, by transformation of electrical energy and change single-phase inverters operating state not only can analog AC three-phase equilibrium, three-phase imbalance load, also can analog DC load; Converter can be presented and adopt three level diode clamp formula voltage source converter, electric energy feedback electrical network is achieved efficiently by transformation of electrical energy, compared with two level converters, it is less that three-level converter inversion produces harmonic wave contained by alternating current, and waveform more levels off to sine wave; Compared to tradition power consumption test load, the utility model have energy-efficient, on a large scale, high accuracy, can the advantage of regulating load continuously, there is larger promotional value and economic worth.
Above-listed detailed description is illustrating for the utility model possible embodiments, and this embodiment is also not used to limit the scope of the claims of the present utility model, does not allly depart from the equivalence that the utility model does and implements or change, and all should be contained in the scope of the claims of this case.

Claims (4)

1. a three-phase and four-line can present formula alternating current-direct current dummy load, for testing the performance of the testing equipment be connected in AC network and efficiency, it is characterized in that: comprise the load current-change device be made up of three single-phase inverters, an inlet wire of every platform single-phase inverters connects a phase line of described testing equipment leading-out terminal, another inlet wire connects the neutral line of described testing equipment leading-out terminal, the upper end outlet of three single-phase inverters and lower end outlet are equipped with load-side DC circuit breaker, and three upper end outlet converges for positive DC bus, article three, lower end outlet converges for negative DC bus, positive and negative DC bus returns link in AC network via presenting converter.
2. three-phase and four-line according to claim 1 can present formula alternating current-direct current dummy load, it is characterized in that: described single-phase inverters comprises two brachium pontis parallel with one another, the upper parallel connected end of two brachium pontis converges the upper end outlet for single-phase inverters, the lower parallel connected end of two brachium pontis converges the lower end outlet for single-phase inverters, each brachium pontis forms by two anti-paralleled diode device for power switching serial connections, the middle part lead-out wire of one of them brachium pontis connects a phase line of described testing equipment leading-out terminal by reactor, the middle part lead-out wire of another brachium pontis connects the neutral line of described testing equipment leading-out terminal, and in the upper end outlet of described single-phase inverters, DC capacitor is connected with between the outlet of lower end.
3. three-phase and four-line according to claim 1 and 2 can present formula alternating current-direct current dummy load, it is characterized in that: described converter of presenting comprises two capacitors be connected in series between positive and negative DC bus, and three single-phase brachium pontis be connected in parallel between positive and negative DC bus, each single-phase brachium pontis comprises four anti-paralleled diode device for power switching be connected in series successively and two clamping diodes be serially connected, be positioned at two anti-paralleled diode device for power switching in the middle part of single-phase brachium pontis and described two clamping diodes are in parallel, the middle part line of two clamping diodes on each single-phase brachium pontis is all connected with the middle part line of described two capacitors, the middle part line of two anti-paralleled diode device for power switching in the middle part of three single-phase brachium pontis draws A phase line respectively, B phase line, C phase line, and respectively via A phase reactor, B phase reactor, C phase reactor returns and is connected in AC network.
4. three-phase and four-line according to claim 3 can present formula alternating current-direct current dummy load, it is characterized in that: be also provided with between described positive and negative DC bus mutually series connection can present side DC circuit breaker, charging resistor and another can present side DC circuit breaker.
CN201520597141.6U 2015-08-10 2015-08-10 Virtual load of formula alternating current -direct current can be presented to three -phase four -wire Expired - Fee Related CN204967283U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114910821A (en) * 2021-02-07 2022-08-16 中通服节能技术服务有限公司 AC virtual load tester for power distribution product

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114910821A (en) * 2021-02-07 2022-08-16 中通服节能技术服务有限公司 AC virtual load tester for power distribution product

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20160113

Termination date: 20210810

CF01 Termination of patent right due to non-payment of annual fee