CN208971409U - A kind of three-phase unsteady flow experiement control device - Google Patents
A kind of three-phase unsteady flow experiement control device Download PDFInfo
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- CN208971409U CN208971409U CN201821621004.1U CN201821621004U CN208971409U CN 208971409 U CN208971409 U CN 208971409U CN 201821621004 U CN201821621004 U CN 201821621004U CN 208971409 U CN208971409 U CN 208971409U
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Abstract
The utility model discloses a kind of three-phase unsteady flow experiement control devices, the experiement control device includes three-phase isolated location, three-phase protective unit, electric signal samples protection location, three-phase drive unit, central control unit, electric signal sampling unit, capacitor filtering unit, man-machine interaction unit and DC load unit, one end of three-phase isolated location is connected to three-phase electricity net side, the other end of three-phase isolated location is connect by AC relay switch and bus with three-phase drive unit, the three-phase drive unit is connect with capacitor filtering unit, capacitor filtering unit is connect by DC relay switch and bus with DC load unit, electric signal sampling unit enters on the bus that end is connected on the bus between three-phase isolated location and three-phase drive unit and is connected between capacitor filtering unit and DC load unit.The utility model can acquire three-phase alternating voltage and DC voltage simultaneously, and realize the mutual conversion between three-phase alternating current and direct current.
Description
Technical field
The utility model belongs to the voltage measurement of three-phase unsteady flow and control technology field more particularly to a kind of experiment of three-phase unsteady flow
Control device.
Background technique
Currently, common three-phase unsteady flow experimental rig usually contains only the full-bridge operating circuit of IGBT composition, need to use
Family separately selects the peripheral test devices such as pressure regulator, isolating transformer, working inductance, filter capacitor, control chip.And it needs to use
All experimental rigs are attached by family using cable.This requires user to have higher professional knowledge and application experience and cost
The additional time and energy goes to select suitably to test accessory.And have the following problems: the unmatched test of user's selection is matched
Part is difficult to obtain test effect, and there are security risk, unmatched test accessory space occupied for unmatched experiment accessory
Greatly, be also inconvenient to move, therefore, free accessory is difficult to ensure the safety and reliability of connection.
Utility model content
The purpose of this utility model is to provide a kind of three-phase unsteady flow experiement control device, the utility model can acquire simultaneously
Three-phase alternating voltage and DC voltage, and the mutual conversion between three-phase alternating current and direct current is realized, do not have to examine in sampling
Consider the total ground problem for using voltage, and strong interference immunity.To achieve the goals above, the utility model is imitated using following technology
Fruit:
According to the one aspect of this hair utility model, a kind of three-phase unsteady flow experiement control device is provided, it is characterised in that:
The experimental provision include three-phase isolated location, three-phase protective unit, electric signal sampling protection location, three-phase drive unit, in
Control unit, electric signal sampling unit, capacitor filtering unit, man-machine interaction unit and DC load unit are entreated, described three are separated by
One end from unit is connected to three-phase electricity net side, and the other end of the three-phase isolated location passes through AC relay switch and bus
It is connect with three-phase drive unit, the output end of the three-phase drive unit is connect with capacitor filtering unit, and capacitor filtering unit passes through
DC relay switch and bus are connect with DC load unit, and the acquisition input terminal of the electric signal sampling unit is separately connected
On bus between three-phase isolated location and three-phase drive unit and it is connected to capacitor filtering unit and DC load unit
Between bus on, the output end of the electric signal sampling unit samples protection location with central control unit and electric signal respectively
Connection, electric signal sampling protection location output end are connect with the input terminal of three-phase protective unit, the control of the three-phase protective unit
End processed is connect with the central control unit, which also connect with the control terminal of the three-phase drive unit, institute
The output end for stating three-phase protective unit connects with the control terminal of AC relay switch and the control terminal of DC relay switch respectively
It connects.
Preferably, the electric signal sampling unit includes at least one DC voltage acquisition unit and several alternating voltages
Acquisition unit, if if electric signal sampling protection location includes main line voltage comparator and main line voltage block circuit, it is described
The acquisition input terminal of DC voltage acquisition unit is connected on the bus between capacitor filtering unit and capacitor filtering unit, described
The acquisition input terminal of AC voltage sampling unit is connected on the bus between three-phase isolated location and three-phase drive unit, described
The input with the acquisition input terminal and voltage comparator of the central control unit respectively of the output end of AC voltage sampling unit
End connection, the output end of the DC voltage acquisition unit respectively with acquisition input terminal and the voltage ratio of the central control unit
Input unit compared with device connects, the differentiation control output difference of the output end of the voltage comparator and the central control unit
It is connect with the input terminal of the voltage block circuit, the output end of the voltage block circuit is connected respectively by three-phase protective unit
It connects on the AC relay switch between three-phase isolated location and three-phase drive unit and capacitor filtering unit is born with direct current
On DC relay switch between carrier unit, the input of the output control terminal of the central control unit and the driving unit
Control terminal connection.
Above scheme is it is further preferred that the voltage block circuit includes latch cicuit, latches display circuit and one
Logic control gate circuit, the output end and DC voltage acquisition unit of the AC voltage sampling unit are compared by voltage respectively
Device is connect with latch cicuit, the output end of the latch cicuit respectively with it is described latch display circuit input terminal and logic control door
The input terminal of circuit connects, and the output end of the logic control gate circuit distinguishes the control of AC relay by three-phase protective unit
End processed is connected with the control terminal of DC relay.
Above scheme is it is further preferred that each AC voltage sampling unit includes an independent power supply, one
Exchange prime sample circuit, an exchange isolated variable circuit and an exchange rear class translation circuit, the independent power supply
Power output end respectively with it is described exchange prime sample circuit power end connect, it is described exchange prime sample circuit sampling
Input terminal is connected on the bus between three-phase isolated location and three-phase drive unit, the output of the exchange prime sample circuit
End is connect by exchange isolated variable circuit with the input terminal of the exchange rear class translation circuit, the exchange rear class translation circuit
Output end is connect with the input terminal of the acquisition input terminal of the central control unit and voltage comparator respectively；The DC voltage
Acquisition unit includes DC power supply, logic power supply, direct current prime sample circuit, DC isolation translation circuit and direct current
The sampling input terminal of rear class translation circuit, the direct current prime sample circuit is connected to capacitor filtering unit and DC load unit
Between bus on, the output end of the direct current prime sample circuit is become by DC isolation translation circuit and the direct current rear class
The input terminal connection of circuit is changed, the output end of the direct current rear class translation circuit is inputted with the acquisition of the central control unit respectively
End is connected with the input terminal of voltage comparator；The power output end of the DC power supply and the electricity of direct current prime sample circuit
Source connection, the power output end of the logic power supply respectively with the power end of the DC isolation translation circuit, exchange
The power end of isolated variable circuit, the power end of direct current rear class translation circuit, the power end of exchange rear class translation circuit and center
The power end of control unit connects.
Above scheme is it is further preferred that the three-phase isolated location includes three-phase contactor, three-phase regulator, three is separated by
From transformer and three pole reactor, one end of the three-phase contactor is connected to three-phase electricity net side, the other end of the three-phase contactor
It is connected by three-phase regulator, three-phase isolation transformer with three pole reactor, which passes through AC relay switch and institute
State the connection of three-phase drive unit.
Above scheme is it is further preferred that the three-phase protective unit includes two input nand gates, triode, protection relay
Device, the output with the output end and central controller of the logic control gate circuit respectively of the input terminal of two input nand gate
The base stage of end connection, the two input nand gates output end and triode connects, the collector and protection relay of the triode
The coil of device is connected, and the emitter of the triode is connected to ground, the contact of the protective relay respectively with AC relay
It is connected with DC relay.
In conclusion the utility model has following technical effect that since the utility model uses above-mentioned technical proposal
(1), the utility model realizes the experimental provision of the utility model mutual between three-phase alternating current and direct current
Conversion, required ancillary equipment, which is grouped together, when carrying out unsteady flow experimental work is attached；The utility model uses a variety of mistakes
Pressure, overcurrent, overheat protector mechanism, guarantee equipment using safe and user personal safety, using more set current transformers
In the case of, it can will cover that equipment is used in parallel more, and be combined into increasingly complex electric energy conversion system, to improve the reliability of connection,
The Electrical Safety of equipment user of service is protected, user of service can play proving ring without in addition finding ancillary equipment with fast construction
Border saves the time and improves working efficiency.
(2), in the present invention, since each channel power source is mutually isolated, so not having to be considered as in sampling
The total ground problem of voltage, strong interference immunity can acquire three-phase alternating voltage and DC voltage simultaneously.The utility model can be realized
It is configured flexibly voltage sample number of channels, effectively enhances the scalability of sample devices, and the voltage of acquisition or electric current are believed
Number input dsp processor carry out operational analysis, dsp processor output pwm pulse signal driving unit is controlled, linearly
Good, control is flexible.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of three-phase unsteady flow experiement control device of the utility model；
Fig. 2 is the circuit diagram of the three-phase isolated location of the utility model；
Fig. 3 is the circuit diagram of the three-phase drive unit of the utility model；
Fig. 4 is the catenation principle figure of electric signal the sampling protection location and electric signal sampling unit of the utility model；
Fig. 5 is the circuit diagram of the electric signal sampling unit of the utility model；
Fig. 6 is the schematic diagram of the electric signal sampling protection location of the utility model；
Fig. 7 is the circuit diagram of the AC voltage sampling unit of the utility model；
Fig. 8 is the circuit diagram of the DC voltage acquisition unit of the utility model；
Fig. 9 is the circuit diagram of the three-phase protective unit of the utility model；
Figure 10 is the first implementing circuit schematic diagram of the logic gate control circuit of the utility model；
Figure 11 is the second embodiment circuit diagram of the logic gate control circuit of the utility model；
Figure 12 is that the three-phase alternating current of the utility model is converted to the flow chart of direct current；
Figure 13 is that the direct current of the utility model is converted to the flow chart of three-phase alternating current.
Specific embodiment
For the purpose of this utility model, technical solution and advantage is more clearly understood, referring to the drawings and enumerate excellent
Embodiment is selected, the utility model is further described.However, it is necessary to illustrate, many details listed in specification
It is specific even without these just for the sake of making reader have a thorough explanation to the one or more aspects of the utility model
Details also may be implemented the utility model these aspect.
As shown in Figure 1, a kind of three-phase unsteady flow experiement control device is provided according to the one aspect of this hair utility model,
The experimental provision includes three-phase isolated location 1, three-phase protective unit 2, electric signal sampling protection location 3, three-phase drive unit
4, central control unit 5, electric signal sampling unit 6, capacitor filtering unit 7, man-machine interaction unit 8 and DC load unit 9, institute
The one end for stating three-phase isolated location 1 is connected to three-phase electricity net side, and the other end of the three-phase isolated location 1 passes through AC relay
Switch and bus are connect with three-phase drive unit 4, and the output end of the three-phase drive unit 4 is connect with capacitor filtering unit 7, capacitor
Filter unit 7 is connect by DC relay switch and bus with DC load unit 9, and the electric signal sampling unit 6 is adopted
Collection input terminal is connected on the bus between three-phase isolated location 1 and three-phase drive unit 4 and is connected to capacitor filtering
On bus between unit 7 and DC load unit 9, the output end of the electric signal sampling unit 6 is single with center control respectively
Member 5 and electric signal sampling protection location 3 connect, which samples the input of protection location 3 output end and three-phase protective unit 2
End connection, the control terminal of the three-phase protective unit 2 connect with the central control unit 5, the central control unit 5 also with institute
State three-phase drive unit 4 control terminal connection, the output end of the three-phase protective unit 2 respectively with the control of AC relay switch
End processed is connected with the control terminal of DC relay switch.
In the present invention, as shown in Fig. 2, the three-phase isolated location 1 include three-phase contactor, three-phase regulator,
Three-phase isolation transformer and three pole reactor, one end of the three-phase contactor are connected to three-phase electricity net side, the three-phase contactor
The other end is connected by three-phase regulator, three-phase isolation transformer with three pole reactor, which is opened by AC relay
Pass connect with the three-phase drive unit, the 380V alternating current by being derived from three-phase electricity net side be respectively connected to three-phase contactor L1,
Tri- connecting terminals of L2, L3, the route enter a three-phase contactor, and three-phase contactor plays control action, for open with
Close three phase mains, three phase mains exports through three-phase contactor to three-phase regulator, three-phase regulator be by three moving-coil types from
Coupling pressure regulator is mounted on same pedestal and is formed, it is by itself short-circuit moving winding on same iron core, along iron core column
It moves up and down, adjusts voltage to change turn ratio, it can be any to 0~380V alternating current by 380V alternating current input voltage regulation
Value.On the one hand power grid has been isolated in one three-phase isolation transformer of plant-grid connection of three-phase regulator output, three-phase isolation transformer
Voltage and user ensure Electrical Safety using voltage, when on the other hand avoiding adjusting three-phase regulator caused by after three-phase regulator
The problem for holding inductance inconsistent, three phase mains export from three-phase isolation transformer and access a three pole reactor, the three-phase electricity
On the one hand sense plays filter action, the three-phase drive on the one hand needing to access for energy storage of boosting, the three pole reactor and its rear
Unit 4 constitutes a booster circuit, and the bridge arm driving that the three-phase drive unit 4 is adopted as 6 IGBT power tube compositions is single
Member after three pole reactor, exports U, V, W tri- as shown in figure 3,6 IGBT power tubes constitute a BOOST booster circuit
Connecting terminal is DSP for accessing the three-phase drive unit 4 being made of 6 IGBT power tube structures, the central control unit 5
Processor, control of the bridge arm of 6 IGBT power tubes composition by central control unit (dsp processor), the electric signal are adopted
The voltage signal that sample unit 6 acquires is sent into dsp processor and carries out operation calculation, and dsp processor will export a tune after operation
Wave processed is used to control the bridge arm of 6 IGBT power tubes composition, to control the electricity of three-phase alternating current access DC load unit
Stream, central control unit passes through the switching sequence for controlling 6 IGBT power tubes, to realize that three-phase alternating current is converted to directly
Galvanic electricity or DC conversion are alternating current, and adjust direct current or exchange the voltage of electricity output, to make three-phase drive unit
Export direct current electric terminal+DC and-DC output voltage through voltage capacitance filter unit 7 filtering after output to DC load unit 9 into
Row charging etc..The DC load unit 9 can be battery, solar energy photovoltaic panel, DC adapter, and exchange flank into
Power grid is accessed after three-phase isolated location；Electric signal sampling unit 6 divides to be adopted for exchange side electrical signal collection and DC side electric signal
Collection, exchange side electrical signal collection mainly acquire ac voltage signal Uuv、Uuw、UvwAc current signal Iu、Iv、Iw；DC side electricity
Signal acquisition is mainly Udc, current signal Idc, after these signals are improved into the voltage of 0~3V by electric signal sampling unit,
Input central control unit 5.
In the present invention, as shown in Fig. 1, Fig. 4, Fig. 5 and Fig. 6, the electric signal sampling unit 6 includes at least one
A DC voltage acquisition unit and several AC voltage sampling units, if electric signal sampling protection location 3 includes main line
If voltage comparator and main line voltage block circuit, the acquisition input terminal of the DC voltage acquisition unit are connected to capacitor filtering
On bus between unit 7 and DC load unit 9, the acquisition input terminal of the AC voltage sampling unit is connected to three and is separated by
From on the bus between unit 1 and three-phase drive unit 4, the output end of the AC voltage sampling unit respectively with the center
The acquisition input terminal of control unit is connected with the input terminal of voltage comparator, the output end difference of the DC voltage acquisition unit
It is connect with the input unit of the acquisition input terminal of the central control unit and voltage comparator, the output of the voltage comparator
The differentiation control output of end and the central control unit is connect with the input terminal of the voltage block circuit respectively, the voltage
Differentiate that the output end of circuit is connected between three-phase isolated location 1 and three-phase drive unit 4 by three-phase protective unit 2
AC relay switch on and the DC relay switch between capacitor filtering unit 7 and DC load unit 9 on, it is described
The output control terminal of central control unit is connect with the input control end of the driving unit；The voltage block circuit includes lock
It deposits circuit, latch display circuit and a logic control gate circuit, as shown in Figure 6.The output of the AC voltage sampling unit
End and DC voltage acquisition unit pass through voltage comparator respectively and connect with latch cicuit, the output end of the latch cicuit respectively with
The input terminal for latching display circuit is connected with the input terminal of logic control gate circuit, the output of the logic control gate circuit
End is connected by the control terminal that three-phase protective unit 2 distinguishes AC relay with the control terminal of DC relay, practical new at this
In type, as shown in Fig. 5, each AC voltage sampling unit includes an independent power supply, an exchange prime sampling electricity
Road, an exchange isolated variable circuit and an exchange rear class translation circuit, the power output end point of the independent power supply
It is not connect with the power end of the exchange prime sample circuit, the sampling input terminal of the exchange prime sample circuit is connected to three
Be isolated on the bus between unit 1 and three-phase drive unit 4, it is described exchange prime sample circuit output end by exchange every
From translation circuit with it is described exchange rear class translation circuit input terminal connect, the output end of the exchange rear class translation circuit respectively with
The acquisition input terminal of the central control unit is connected with the input terminal of voltage comparator；The DC voltage acquisition unit includes
DC power supply, logic power supply, direct current prime sample circuit, DC isolation translation circuit and direct current rear class transformation electricity
Road, as shown in figure 4, the sampling input terminal of the direct current prime sample circuit is connected to capacitor filtering unit 7 and DC load list
On bus between member 9, after the output end of the direct current prime sample circuit is by DC isolation translation circuit and the direct current
The input terminal connection of grade translation circuit, the acquisition with the central control unit respectively of the output end of the direct current rear class translation circuit
Input terminal is connected with the input terminal of voltage comparator；The power output end and direct current prime sample circuit of the DC power supply
Power end connection, the power output end of the logic power supply respectively with the power end of the DC isolation translation circuit,
Exchange the power end of isolated variable circuit, direct current rear class translation circuit power end, exchange rear class translation circuit power end and
The power end of central control unit connects.In the present invention, as shown in figure 5, the power supply of the logic power supply exports
End (three power output ends VCC1, VCC2 and VCC3) respectively with the power end VCC1 of the DC isolation translation circuit, exchange
The power end VCC1 of isolated variable circuit, direct current rear class translation circuit power end VCC2, exchange the power supply of rear class translation circuit
End VCC2 is connected with the power end VCC3 of central control unit；Due to AC voltage sampling unit all use one it is independently-powered
Power supply and alternating current rear class translation circuit use another logic power supply and are powered, before isolation be isolated
Circuit afterwards uses mutually independent power supply, thus by the 1st AC voltage sampling unit to n-th AC voltage sampling unit
Each channel power source carry out it is mutually isolated, so in sampling without being considered as the total ground problem of voltage.It is practical new at this
In type, as shown in fig. 7, the exchange prime sample circuit includes resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, electricity
R6, the first operational amplifier U1 and second operational amplifier U2 are hindered, the exchange rear class translation circuit includes resistance R7, resistance
R8, resistance R9, resistance R10, resistance R11, resistance R1f, third operational amplifier U3 and four-operational amplifier U4, the exchange
Isolated variable circuit includes Hall sensor U5, the model LV25_P Hall voltage sensor which uses, institute
One end of one end and resistance R2 for stating resistance R1 is connected to the bus between three-phase isolated location 1 and three-phase drive unit 4
On, the other end of resistance R1 is connect with one end of the electrode input end of the first operational amplifier U1 and resistance R3 respectively,
The other end of the resistance R2 is connect with one end of the negative input and resistance R4 of stating the first operational amplifier U1 respectively, institute
The output end for stating the first operational amplifier U1 is connect with one end of the other end of resistance R4 and resistance R5 respectively, resistance R5's
The other end is connect with the electrode input end of the second operational amplifier U2, the output end difference of second operational amplifier U2
It is connect with the negative input of one end of resistance R6 and second operational amplifier U2, the other end and the Hall of resistance R6 passes
The signal input part of sensor U5 connects, the signal output end of the Hall sensor U5 respectively with one end of resistance R7 and resistance
One end of R8 connects, the other end of the resistance R8 respectively with the negative input of third operational amplifier U3, resistance R9 one
End is connected with one end of resistance R10, and the other end of resistance R10 is connect with the reference output end of the logic power supply, institute
The output end for stating third operational amplifier U3 is connect with one end of the other end of resistance R9 and resistance R11 respectively, resistance R11's
The other end is connect with one end of the negative input of the four-operational amplifier U4 and resistance R1f respectively, and the 4th operation is put
The sampled output out of big device U4 respectively with the acquisition input terminal and corresponding electricity of the other end of resistance R1f, central control unit
The electrode input end of comparator is pressed (to be attached) connection between acquisition output end vo ut1~acquisition output end vo utN, so that
The DC voltage that four-operational amplifier U4 finally acquires output end out is 0~3V, for being input to central control unit (DSP
Processor) it carries out operation calculation and is input to the electrode input end (any of them of Vout1~VoutN of voltage comparator in Fig. 6
Signal differentiation, the anode input of the other end of the resistance R3, the other end of resistance R7, third operational amplifier U3 are carried out all the way
The negative input of end and four-operational amplifier U4 are connected to ground, in utility model, using 3 AC voltage sampling lists
Member is connected to tri- AC terminal of U, V, W on the bus between three-phase isolated location 1 and three-phase drive unit 4
On, wherein the resistance R1 of each unit is connected on three AC terminal, resistance R2 is connected on zero curve, by first
Operational amplifier U1 and second operational amplifier U2 separately constitutes difference channel and voltage follower circuit composition, first operation
Amplifier U1 reduces the voltage for exchanging isolated location output, and reduction ratio is R1/R3 times, and R1=R2, R3=R4,
Wherein, R1, R2, R3 and R4 are respectively resistance value of the resistance R1 to resistance R4, and the second operational amplifier U2 is as voltage follow
Device is used to improve the driving capability of the first operational amplifier U1 output voltage signal, and resistance R6 is used for as configuration resistance by the
The voltage signal of two operational amplifier U2 output is converted in current signal input Hall sensor U5, to complete to sampling electricity
Pressure drives Hall sensor U5 after being decayed, the secondary output current of Hall sensor U5 is converted to voltage letter by resistance R7
Number, the reference voltage signal V for exporting logic power supply using the adder being made of third operational amplifier U3fIt carries out
It is promoted, VfFor the DC reference voltage that one accurate and voltage value size is 1.5V, the independent power supply and logic are supplied
The voltage that power supply exports respectively is+15V, -15V ,+3V ,+5V and+1.5V, is then attached to by four-operational amplifier U4
The proportion operational amplifier of composition, wherein the power output end of independent power supply respectively with the first operational amplifier U1 and
The power end of two operational amplifier U2 connects (not shown), and the power output end of the logic power supply is passed with Hall respectively
Power input, the power input of third operational amplifier U3 and the power input of four-operational amplifier U4 of sensor U5
Connection, to make the Hall sensor U5 that current signal are converted to voltage signal and promoted, to carry out subsequent tune
Reason, so that the DC voltage of four-operational amplifier U4 final output is 0~3V, for being input to central control unit (at DSP
Reason device) it carries out carrying out differentiation and protection processing in operation calculation and the voltage comparator accessed in voltage block circuit, center control
Unit (dsp processor) processed is according to operation as a result, being adjusted the output electric current of driving unit.Therefore, the friendship in multiple channels
It flows and forms an independent isolation sampling channel between the front stage of voltage acquisition unit, and power supply is mutually isolated, therefore,
It can carry out choosing the port number of voltage acquisition as needed, it is mutually isolated between each channel, interference is not generated.Each is handed over
It flows voltage acquisition unit and uses an independent power supply, an exchange prime sample circuit, an exchange isolated variable electricity
Road exchanges rear class translation circuit with one, thus complete the DC inversion in power grid DC-AC or AC-DC it is whole
Stream process, not by alternate signal interference when detection, and isolation is good.In the present invention, as shown in figure 8, it is described straight
Stream prime sample circuit includes that resistance R12, resistance R13, resistance R14, resistance R15, resistance R16, resistance R17, the 5th operation are put
Big device U6 and the 6th operational amplifier U7, the direct current rear class translation circuit includes resistance R18, resistance R19, resistance R20, resistance
R21, resistance R22, resistance R2f, the 7th operational amplifier U8 and the 8th operational amplifier U9, the DC isolation translation circuit packet
Include Hall sensor U10, one end of the resistance R12 and one end of resistance R13 are connected to capacitor filtering unit 7 and straight
On bus between current load unit 9, the other end of resistance R12 is inputted with the anode of the 5th operational amplifier U6 respectively
End is connected with one end of resistance R14, and the other end of the resistance R13 is inputted with the cathode for stating the 5th operational amplifier U6 respectively
End connected with one end of resistance R15, the output end of the 5th operational amplifier U6 respectively with the other end and resistance of resistance R15
One end of R16 connects, and the other end of resistance R16 is connect with the electrode input end of the 6th operational amplifier U7, the 6th fortune
The output end for calculating amplifier U7 is connect with the negative input of one end of resistance R17 and the 6th operational amplifier U7 respectively, the electricity
The other end of resistance R17 is connect with the signal input part of the Hall sensor U10, the signal output of the Hall sensor U10
End is connect with one end of one end of resistance R18 and resistance R19 respectively, and the other end of the resistance R19 is put with the 7th operation respectively
The negative input of big device U8, one end of resistance R20 are connected with one end of resistance R21, the other end of resistance R21 with it is described
The reference output end of logic power supply connects, and the output end of the 7th operational amplifier U8 is another with resistance R20 respectively
End connected with one end of resistance R22, the other end of resistance R22 respectively with one end of resistance R2f and the 8th operational amplifier U9
Negative input connection, the output end of the 8th operational amplifier U9 respectively with the other end of resistance R2f, central control unit
Acquisition input terminal and connection, the sampled output out of the 8th operational amplifier U9 respectively with the other end of resistance R2f, in
Entreat the acquisition input terminal of control unit and electrode input end (the acquisition output end V of corresponding voltage comparatoroutd, such as Fig. 6 institute
Show) connection, the other end of the resistance R14, the other end of resistance R18, the electrode input end of the 7th operational amplifier U8 and the
The electrode input end of eight operational amplifier U9 is connected to ground.In the present invention, the resistance R12 and resistance R13 drive respectively
On the output direct current electric terminal-DC and+DC of moving cell, therefore, by the 5th operational amplifier U6 and the 6th operational amplifier U7 points
Not Zu Cheng difference channel and voltage follower circuit composition, the 5th operational amplifier U6 by the voltage of the output of driving unit or
Electric current is reduced, and reduction ratio is R12/R14 times, and R12=R13, R14=R15, wherein R12, R13, R14 and R15 points
Not Wei resistance R12 to resistance R15 resistance value, the 6th operational amplifier U7 as voltage follower for improve the 5th operation
The driving capability of amplifier U6 output voltage signal, resistance R17 is as configuration resistance, for exporting the 6th operational amplifier U7
Voltage signal be converted to current signal and input in Hall sensor U10, thus complete decaying rear-guard is carried out to sampled voltage
Dynamic Hall sensor U10, the secondary output current of Hall sensor U10 are converted to voltage signal by resistance R18, using by
The reference voltage signal V that the adder of 7th operational amplifier U8 composition exports logic power supplyf1(+1.5V's or so is straight
Galvanic electricity pressure) promoted, the voltage that the logic power supply exports respectively be+15V, -15V ,+3V ,+5V and+1.5V, so
It is connected to the proportion operational amplifier being made of the 8th operational amplifier U9 afterwards, wherein the power supply of DC power supply DC exports
End is connect with the 5th operational amplifier U6 and the 6th operational amplifier U7 respectively, the power output end point of the logic power supply
Not with the power input and the 8th operational amplifier U9 of the power input of Hall sensor U10, the 7th operational amplifier U8
Power input connection, thus when the Hall sensor U10 current signal is converted into voltage signal and is promoted, with
Just subsequent conditioning is carried out, so that the DC voltage that the 8th operational amplifier U9 finally acquires output end out is 0~3V, for defeated
Enter to central control unit (dsp processor) and carries out operation calculation and be input to the electrode input end of voltage comparator in Fig. 6
Voutd(first via voltage comparator is inputted as d. c. voltage signal, the second road voltage comparator to N for middle progress signal differentiation
Road voltage comparator is ac voltage signal input), central control unit (dsp processor) is according to operation as a result, being adjusted
The output electric current of whole three-phase drive unit 4.
In the present invention, in conjunction with Fig. 6 and Fig. 9, the three-phase protective unit 2 includes two input nand gate Usb, three poles
Pipe Q1, protective relay Jsb, the output with the logic control gate circuit respectively of the input terminal of the two input nand gates Usb
End is connected with the output end of central controller, and the two input nand gates Usb output end is connect with the base stage of triode Q1, institute
The collector for stating triode Q1 is connected with the coil of protective relay Jsb, and the emitter of the triode Q1 is connected to ground, described
The contact of protective relay Jsb is connect with AC relay and DC relay respectively, and the three-phase protective unit 2 is on the one hand
The hardware alarms signal Dout_r from electric signal sampling unit 6 is received, is on the other hand received from the soft of central control unit 5
Part alarm signal Dout_rs receives any alarm signal (when Dout_r and Dout_rs are high level), three-phase protective
Unit 2 all can close exchange side three-phase electricity by protective relay Jsb and DC side power supply, protective relay Jsb meet+5V respectively
When conducting, the contact closure of protective relay Jsb by+24V voltage access AC relay and DC relay make its be closed into
Row control exchange side three-phase electricity and DC side power supply, connect three-phase isolated location 1 by AC relay with three-phase drive unit 4
Logical, (AC relay and DC relay be 24V driving coil) capacitor filtering unit 7 and DC load unit 9 are logical
DC relay connection is crossed, thus protection staff and equipment safety.
In the present invention, in conjunction with shown in Fig. 4, Fig. 6 and Figure 10, the logic gate control circuit includes that multichannel is mutually folded
The logic input circuits that add and all the way amplification output circuit, on logic inputs the output end of logic input circuits all the way under all the way
To the input terminal of the amplifying circuit, the quantity of the logic input circuits is two for output after the output end of circuit is sequentially overlapped
It is more than road, three tunnels or four tunnels, when the quantity of the logic input circuits is two-way, logic input circuits by two inputs and door Us1,
Two inputs are formed with the input of door Us2 and two with door Us3, and the amplification output circuit is by resistance Rs1, resistance Rs2, resistance Rs3, electricity
Hinder Rs4, resistance Rs5, triode QS1 and triode QS2 composition, the input terminal point of two inputs and the input of door Us1 and two and door Us2
The output end (SOC1~SOCn) of latch cicuit (using RS latch trigger circuit) in other map interlinking 6, per all the way two inputs and door
The output end SOCn of the corresponding latch cicuit all the way of input terminal, the voltage when sampled voltage is all not above setting value, in Fig. 6
When comparison circuit exports high level, latch cicuit output end exports high level, and two inputs are with the input of door Us1 and two with door Us2's
Output end exports high level, then two inputs export high level with door Us3, exports by triode QS1 and triode QS2 hard
Part alarm signal Dout_r is high level.If at this time in Fig. 9 at the software alarm Dout_rs of two input nand gate Usb input terminals
In normal condition, then high level is also exported.When NAND gate Usb exports low level, relay Jsb coil is not attracted, the relay
Device Jsb is normally closed relay, and when relay Jsb coil is not attracted, AC relay and DC relay receive 24V electricity
Source drives and is attracted, and current transformer ac bus is connected with DC bus at this time, operates normally.It is set when any road sampled voltage exceeds
When definite value, corresponding voltage comparator circuit exports a low level in Fig. 6, and the latch cicuit of its rear end can export a low electricity
Flat, if sampled voltage is returned to setting value once at this time, latch cicuit is still output low level, until latch cicuit receives again
Until the signal of position, any latch cicuit exports a low level, by two inputs and door Us1, two inputs with after door Us2, then passes through
A low level can be exported with door Us3 by crossing two inputs.At this time hardware alarms signal export low level, by Fig. 9 two input with
After NOT gate Usb, then NAND gate Usb exports a high level, and relay Jsb is attracted, and AC relay J and DC relay Z connect
It can not receive 24V driving power, AC relay J and DC relay Z are disconnected.Ac bus and DC bus disconnect at this time, rise
To protective effect.Similarly, in conjunction with shown in Fig. 4, Fig. 6 and Figure 11, when the quantity of the logic input circuits is three tunnels, logic input
Circuit is by two inputs and door Us11, two inputs and door Us21, two inputs and door Us31, two inputs and the input of door Us41 and two and door
Us31 composition, the voltage in output end SOCn, Fig. 6 per all the way two input latch cicuits all the way corresponding with the input terminal of door compare
When device exports high level, output end (output of six road latch signal of SOC1~SOCn, the embodiment Zhong You) output of latch cicuit
High level, two inputs are also high level with door Us11, two inputs and the input of door Us21 and two and the output end output of door Us31,
Then two inputs export high level to two inputs with after door Us5 with door Us4, and two inputs also export high level with door Us5, by three poles
The hardware alarms signal Dout-r of pipe QS1 and triode QS2 output is high level, if two input nand gate Usb are defeated in Fig. 9 at this time
The software alarm Dout_rs for entering end is in normal condition, then also exports high level.When NAND gate Usb exports low level, relay
Jsb coil is not attracted, the relay Jsb be normally closed relay, when relay Jsb coil is not attracted, AC relay and
DC relay receives 24V power drives and is attracted, and current transformer ac bus is connected with DC bus at this time, operates normally.
In the present invention, in conjunction with shown in Fig. 1, Figure 12 and Figure 13, a kind of three-phase unsteady flow according to the present utility model is real
The experiment control for testing control device mainly includes the steps that for AC power source being converted into DC power supply and is converted into DC power supply
The step of AC power source, experiment control specifically comprise the following steps: to pass through when needing AC power source being converted to DC power supply
The selection exchange of man-machine interaction unit 8 turns direct current instruction, and man-machine interaction unit 8 turns direct current to the sending exchange of central control unit 5 and refers to
Enable, central control unit 5 turns the control instruction of DC control for exchange is executed, at this time three phase network flank into three phase mains and according to
Secondary input three-phase isolated location and three-phase drive unit, and a target voltage values set by user are exported, it adjusts and enters three-phase
The voltage of driving unit 4 and carry out exchange turn DC converting, using capacitor filtering unit 7 filter after export DC power supply to directly
Current load unit 9, so that completing alternating voltage is converted into DC voltage；As shown in figure 12, it adjusts and enters three-phase drive unit 4
Voltage and carry out exchange and turn the shift step of DC converting include:
Step 10: user sets a target voltage values, and collected exchange side voltage signal is carried out voltage vector change
It changes and obtains orientation angle；
Step 11: current vector transformation being carried out to ac-side current, transformed vector value is then inputted into three-phase drive
Unit 4 carries out DC adjustment, the target voltage values and actual sample value progress PI adjusting of 4 pairs of three-phase drive unit settings, output
PI regulated value carry out the adjusting of d axis and q shaft current and export control amount, i.e., an exportable desired current value；
Step 12: d axis and q shaft current are adjusted to conversion synthesis SVPWM modulation after 2/3 transformation of control amount progress of output
For controlling 4 working condition of three-phase drive unit after wave, and then adjust output voltage；
Step 13: the voltage that collected exchange side voltage signal export after voltage vector transformation (will be collected
Exchange side voltage signal carry out the resulting signal of vector) be compared with the target voltage values of setting, judge that voltage is electric
Whether stream is in safe range, and then goes out alarm signal, while the exchange that central control unit will collect to three-phase protective unit 2
Side voltage signal is shown on man-machine interaction unit 8 in the form of numerical value.
When needing AC power source being converted to DC power supply, direct current is selected to deliver stream instruction by man-machine interaction unit 8,
Finishing man-machine interaction unit 8 issues exchange to central control unit 5 and turns direct current instruction, and central control unit 5 will execute direct current and turn
The control instruction of exchange, DC load unit 9 is a battery or photovoltaic panel at this time, exports DC load unit 9
DC power supply through capacitor filtering unit 7 filtering after, the capacitor filtering unit 7 output DC voltage be sent into three-phase drive unit into
The voltage of inversion output is sent into after three-phase isolated location carries out boosting inverter and accesses three phase network side by inversion transformation；Such as Figure 13
Shown, the DC voltage that the capacitor filtering unit 7 exports is sent into three-phase drive unit and is included the following steps: into inversion transformation
Step 20: user sets a target current value, and collected ac-side current signal is carried out voltage vector change
It changes and obtains orientation angle；
Step 21: current vector transformation being carried out to ac-side current, transformed vector value is then inputted into three-phase drive
Unit 4 carries out DC adjustment, the target voltage values and actual sample value progress PI adjusting of 4 pairs of three-phase drive unit settings, output
PI regulated value carry out the adjusting of d axis and q shaft current and export control amount, i.e., an exportable desired three-phase electricity flow valuve；
Step 22: converting synthesis SVPWM modulation after the output control amount that d axis and q shaft current are adjusted is carried out 2/3 transformation
Wave for controlling 4 working condition of three-phase drive unit, and then adjusts output voltage；
Step 23: the voltage that collected ac-side current signal export after voltage vector transformation (will be collected
Transformation after the exchange side voltage signal that exports) be compared with the target voltage values of setting, judge whether voltage and current is in
Safe range, and then go out alarm signal, while the exchange side voltage signal that central control unit will collect to three-phase protective unit 2
It is shown in the form of numerical value on man-machine interaction unit 8；The current value of an outflow current transformer is given at user's given value, is passed through
A modulating wave will be exported after central control unit (dsp processor) operation to be used to control such as 6 bridge arms in Fig. 3, to control
Current transformer processed flows into the electric current of power grid.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without departing from the principle of this utility model, can also make several improvements and retouch, these improve and
Retouching also should be regarded as the protection scope of the utility model.
Claims (6)
1. a kind of three-phase unsteady flow experiement control device, it is characterised in that: the experimental provision includes three-phase isolated location (1), three
Phase protection location (2), electric signal sampling protection location (3), three-phase drive unit (4), central control unit (5), electric signal are adopted
Sample unit (6), capacitor filtering unit (7), man-machine interaction unit (8) and DC load unit (9), the three-phase isolated location
(1) one end is connected to three-phase electricity net side, and the other end of the three-phase isolated location (1) passes through AC relay switch and bus
It is connect with three-phase drive unit (4), the output end of the three-phase drive unit (4) is connect with capacitor filtering unit (7), capacitor filtering
Unit (7) is connect by DC relay switch and bus with DC load unit (9), the electric signal sampling unit (6)
Acquisition input terminal is connected on the bus between three-phase isolated location (1) and three-phase drive unit (4) and is connected to electricity
On bus between capacitor filter unit (7) and DC load unit (9), the output end of the electric signal sampling unit (6) is distinguished
With central control unit (5) and electric signal sampling protection location (3) connect, the electric signal sample protection location (3) output end and
The input terminal of three-phase protective unit (2) connects, and the control terminal of the three-phase protective unit (2) and the central control unit (5) are even
It connects, which also connect with the control terminal of the three-phase drive unit (4), the three-phase protective unit (2)
Output end is connect with the control terminal of the control terminal of AC relay switch and DC relay switch respectively.
2. a kind of three-phase unsteady flow experiement control device according to claim 1, it is characterised in that: the electric signal sampling is single
First (6) include at least one DC voltage acquisition unit and several AC voltage sampling units, the electric signal sampling protection
For unit (3) if if including main line voltage comparator and main line voltage block circuit, the acquisition of the DC voltage acquisition unit is defeated
Enter on the bus that end is connected between capacitor filtering unit (7) and DC load unit (9), the AC voltage sampling unit
Acquisition input terminal is connected on the bus between three-phase isolated location (1) and three-phase drive unit (4), the AC voltage sampling
The output end of unit is connect with the input terminal of the acquisition input terminal of the central control unit and voltage comparator respectively, described straight
Flow voltage acquisition unit output end respectively with the central control unit acquisition input terminal and voltage comparator input list
The differentiation control output of member connection, the output end of the voltage comparator and the central control unit is sentenced with the voltage respectively
The input terminal of other circuit connects, and the output end of the voltage block circuit is connected to three-phase by three-phase protective unit (2)
On AC relay switch between isolated location (1) and three-phase drive unit (4) and capacitor filtering unit (7) is born with direct current
On DC relay switch between carrier unit (9), the output control terminal of the central control unit and the driving unit
The connection of input control end.
3. a kind of three-phase unsteady flow experiement control device according to claim 2, it is characterised in that: the voltage block circuit
Including latch cicuit, latch display circuit and a logic control gate circuit, the output end of the AC voltage sampling unit and
DC voltage acquisition unit passes through voltage comparator respectively and connect with latch cicuit, the output end of the latch cicuit respectively with it is described
The input terminal for latching display circuit is connected with the input terminal of logic control gate circuit, and the output end of the logic control gate circuit is logical
The control terminal for crossing three-phase protective unit (2) difference AC relay is connected with the control terminal of DC relay.
4. a kind of three-phase unsteady flow experiement control device according to claim 2 or 3, it is characterised in that: each alternating current
Pressing acquisition unit includes an independent power supply, an exchange prime sample circuit, an exchange isolated variable circuit and one
A exchange rear class translation circuit, the power output end of the independent power supply respectively with the electricity for exchanging prime sample circuit
The sampling input terminal of source connection, the exchange prime sample circuit is connected to three-phase isolated location (1) and three-phase drive unit
(4) on the bus between, it is described exchange prime sample circuit output end by exchange isolated variable circuit with after described exchange
The input terminal connection of grade translation circuit, the acquisition with the central control unit respectively of the output end of the exchange rear class translation circuit
Input terminal is connected with the input terminal of voltage comparator；The DC voltage acquisition unit includes DC power supply, logic power supply
Power supply, direct current prime sample circuit, DC isolation translation circuit and direct current rear class translation circuit, the direct current prime sample circuit
Sampling input terminal be connected on the bus between capacitor filtering unit (7) and DC load unit (9), the direct current prime is adopted
The output end of sample circuit is connect by DC isolation translation circuit with the input terminal of the direct current rear class translation circuit, after the direct current
The output end of grade translation circuit is connect with the input terminal of the acquisition input terminal of the central control unit and voltage comparator respectively；
The power output end of the DC power supply is connect with the power end of direct current prime sample circuit, the logic power supply
Power output end is respectively and after the power end of the DC isolation translation circuit, the power end for exchanging isolated variable circuit, direct current
The power end of grade translation circuit, the power end for exchanging rear class translation circuit are connected with the power end of central control unit.
5. a kind of three-phase unsteady flow experiement control device according to claim 1, it is characterised in that: the three-phase isolated location
It (1) include three-phase contactor, three-phase regulator, three-phase isolation transformer and three pole reactor, one end of the three-phase contactor connects
It connects in three-phase electricity net side, the other end of the three-phase contactor is connected by three-phase regulator, three-phase isolation transformer and three pole reactor
It connects, which is connect by AC relay switch with the three-phase drive unit.
6. a kind of three-phase unsteady flow experiement control device according to claim 3, it is characterised in that: the three-phase protective unit
(2) include two input nand gates, triode, protective relay, the input terminal of two input nand gate respectively with the logic
The output end of control gate circuit is connected with the output end of central controller, the base of the two input nand gates output end and triode
Pole connection, the collector of the triode are connected with the coil of protective relay, and the emitter of the triode is connected to ground, institute
The contact for stating protective relay is connect with AC relay and DC relay respectively.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109194163A (en) * | 2018-09-30 | 2019-01-11 | 广西南宁市晨启科技有限责任公司 | A kind of three-phase unsteady flow experiement control device and its experiment control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109194163A (en) * | 2018-09-30 | 2019-01-11 | 广西南宁市晨启科技有限责任公司 | A kind of three-phase unsteady flow experiement control device and its experiment control method |
| CN109194163B (en) * | 2018-09-30 | 2023-11-28 | 广西南宁市晨启科技有限责任公司 | Three-phase variable current experiment control device and experiment control method thereof |
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