CN205844371U - A kind of energy feedback AC electronic load device of wide input and output voltage - Google Patents
A kind of energy feedback AC electronic load device of wide input and output voltage Download PDFInfo
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Abstract
This utility model relates to the energy feedback AC electronic load device of a kind of wide input and output voltage, to overcome the shortcoming and defect in the existing simulation load equipment technology being made up of power resistor, water resistance, reactor, capacitor, by using the most double PWM rectification inverter circuit, the electric energy 100% of simulation load is fed back to electrical network, saves the energy；And realize being precisely controlled of load circuit Automatic continuous, to produce the load current containing harmonic components or the load current of any load character the most easily, fully meet the test requirements document of high performance load pattern；And by being respectively provided with the transformator of pressure-adjustable in grid side and load-side, meet the access of both sides different electrical power standard, it is achieved the energy feedback alternating current electronic load function of wide input and output voltage.
Description
Technical field
This utility model belongs to simulation load equipment technical field, and the energy particularly to a kind of wide input and output voltage returns
Feedback AC electronic load device.
Background technology
At present the power-supply devices such as electromotor, USB power source, wind-powered electricity generation, photovoltaic DC-to-AC converter and battery are carried out load type approval test
Time be all to use the simulation load equipment such as power resistor, water resistance, reactor, capacitor to test, need to consume substantial amounts of
Electric energy.And a large amount of heat energy that above-mentioned simulation load equipment produces in process of the test can cause test environment severe.Simultaneously by
Poor in the load current control accuracy of above-mentioned simulation load equipment, it is impossible to regulating load electric current and simulation are produced the most continuously
The raw load current containing harmonic components, it is impossible to meet the test requirements document of high performance load pattern.
Utility model content
The purpose of this utility model is the shortcoming and defect in order to solve above-mentioned prior art, it is provided that a kind of wide input and output
The energy feedback AC electronic load device of voltage, overcomes and existing is made up of power resistor, water resistance, reactor, capacitor
Shortcoming and defect in simulation load equipment technology, by using double PWM rectification inverter circuit, by the electric energy of simulation load
100% feeds back to electrical network, saves the energy；And realize being precisely controlled of load circuit Automatic continuous, to facilitate real estate as required
The raw load current containing harmonic components or the load current of any load character, fully met high performance load pattern
Test requirements document；And by being respectively provided with the transformator of pressure-adjustable in grid side and load-side, meet both sides different electrical power standard
Access, it is achieved the energy feedback alternating current electronic load function of wide input and output voltage.
To achieve these goals, the technical solution adopted in the utility model is as follows:
The energy feedback AC electronic load device of a kind of wide input and output voltage, its circuit structure includes grid side circuit
And load side electrical circuitry；
Described grid side circuit includes grid side transformator, grid side LC wave filter and grid side inverter；Described electrical network
The input of side transformer accesses electrical network by switch, and its outfan is connected with the input of described grid side LC wave filter；Institute
The outfan of the input and described grid side LC wave filter of stating grid side inverter is connected, and its dc bus terminates into described negative
Carry lateral circuit；
Described load side electrical circuitry includes load-side inverter, load-side LC wave filter and load-side transformator；Described load
The dc bus end of side inverter is connected with the dc bus end of described grid side inverter, its input and described load-side LC
The outfan of wave filter connects；The outfan of described load-side transformator is connected with the input of described load-side LC wave filter,
Its input accesses the ac output end of test equipment by switch as alternating current electronic load；
The switch of the switch of grid side and described grid side circuit and described load side electrical circuitry and load-side collectively forms the back of the body
The double PWM rectification inverter circuit of backrest.
As the preferred technical scheme of one, described grid side transformator is three-phase transformer, and its three-phase input end is respectively
Access electrical network by a switch, and it is according to the work of the voltage source standard buck or boost extremely described grid side inverter of electrical network
Voltage, and isolate electrical network and alternating current electronic load.
As the preferred technical scheme of one, described grid side LC wave filter include one end respectively with described grid side transformation
Three grid side inductance components, the first phase being connected in parallel in grid side transformator and the second phase that the three-phase output end of device connects
The first electric capacity between outfan, second be connected in parallel between the second phase of grid side transformator and third phase outfan electricity
The 3rd electric capacity held and be connected in parallel between the first phase of grid side transformator and third phase outfan；Described grid side LC
Wave filter constitutes LCL third-order filter with described grid side transformator.
As the preferred technical scheme of one, described grid side inverter is a three-phase full-bridge inverter, and its three-phase inputs
The end other end with three grid side inductance components of described grid side LC wave filter respectively is connected.
As the preferred technical scheme of one, described load-side inverter is a three-phase full-bridge inverter, its dc bus
Connect with the dc bus of described grid side inverter.
As the preferred technical scheme of one, described load-side transformator is three-phase transformer, and its three-phase input end is respectively
By accessing the ac output end of test equipment after a switch as alternating current electronic load, and it is according to the voltage source standard of load
The running voltage of buck or boost extremely described load-side inverter, and isolate tested formula equipment and alternating current electronic load.
As the preferred technical scheme of one, described load-side LC wave filter includes three load-side inductance components, parallel connections
The 4th electric capacity that is connected between the first phase of load-side transformator and the second phase output terminal, it is connected in parallel in load-side transformator
The second phase and third phase outfan between the 5th electric capacity and be connected in parallel in the first phase and the third phase of load-side transformator
The 6th electric capacity between outfan；Described three load-side inductance component one end are defeated with the three-phase of described load-side transformator respectively
Going out end to connect, other end three-phase input end with described load-side inverter respectively is connected；Described load-side LC wave filter and institute
State load-side transformator and constitute LCL third-order filter.
During load-side zero load, the duty of grid side inverter is the rectification state at third and fourth quadrant, and its direct current
The DC voltage size that the voltage swing of bus is corresponding equal to grid side alternating voltage；When load-side produces load current, electrical network
The duty of side inverter is the inverter mode of first and second quadrant, and the voltage of its dc bus is higher than grid side alternating voltage
Corresponding DC voltage, and the electric energy feedback electrical network that load current is produced.
By changing grid side transformator and the voltage ratio size of load-side transformator, it is achieved both sides different voltages arbitrarily
The voltage input of rank.
By technique scheme, this utility model has reached the most useful following technique effect:
1) by using the most double PWM rectification inverter circuit, the electric energy 100% of simulation load is fed back to electrical network, joint
Save the energy；And realize being precisely controlled of load circuit Automatic continuous, to produce bearing containing harmonic components the most easily
Carry electric current or the load current of any load character, fully meet the test requirements document of high performance load pattern；And pass through
Grid side and load-side are respectively provided with the transformator of pressure-adjustable, meet the access of both sides different electrical power standard, it is achieved wide input is defeated
Go out the energy feedback alternating current electronic load function of voltage, overcome existing by power resistor, water resistance, reactor, capacitor structure
Shortcoming and defect in the simulation load equipment technology become；
2) constitute LCL third-order filter by grid side LC wave filter with grid side transformator, thoroughly filter grid side inverse
Become harmonic current and peak voltage produced by device, it is ensured that input harmonic current total distortion degree THDi≤5% of grid side, with symbol
Close the prescription of public electric wire net power supply；
3) it is that two nested structures are identical by the three-phase full-bridge inverter of grid side and the three-phase full-bridge inverter of load-side
PWM rectifier, uses Digital Phase-Locked Loop Technology and the whole flow control technology of Direct Current Control PWM, as long as it is whole to change load-side PWM
The DC voltage setting value of stream device, load-side can produce that size is continuous and any adjustable load current.As long as making load-side
PWM rectifier, namely load-side inverter is at third and fourth quadrant jobs, load-side can produce power factor be 1 or power because of
Any adjustable perception of number or capacitive load currents.Further, as long as changing the modulation algorithm of load-side PWM rectifier, then load
Side can produce the load current containing harmonic components；
4) constitute LCL third-order filter by load-side LC wave filter with load-side transformator, thoroughly filter load-side three
Harmonic current and peak voltage produced by phase full-bridge inverter.
In order to be more fully understood that and implement, describe this utility model below in conjunction with the accompanying drawings in detail.
Accompanying drawing explanation
Fig. 1 is the circuit structure signal of the energy feedback AC electronic load device of this utility model width input and output voltage
Figure.
Detailed description of the invention
This utility model provides the energy feedback AC electronic load device of a kind of wide input and output voltage, to its circuit
Structure improves, and can carry out perfect to its function in conjunction with control technology.
Refer to Fig. 1, after the energy feedback AC electronic load device of this utility model width input and output voltage improves
Circuit structure include interconnective grid side circuit 1 and load side electrical circuitry 2.Further, the switch 3 of grid side and described electrical network
Lateral circuit 1 collectively forms the most double PWM rectification inverter circuit with the switch 4 of described load side electrical circuitry 2 and load-side.
Specifically, described grid side circuit 1 includes grid side transformator 11, grid side LC wave filter 12 and grid side inversion
Device 13.The input of described grid side transformator 11 is by switch 3 access electrical network, its outfan and described grid side LC wave filter
The input of 12 connects；The input of described grid side inverter 13 is connected with the outfan of described grid side LC wave filter 12,
Its dc bus terminates into described load side electrical circuitry 2.
Preferably, described grid side transformator 11 is three-phase transformer, and its three-phase input end is accessed by a switch respectively
Electrical network, and it is according to the running voltage of the voltage source standard buck or boost extremely described grid side inverter 13 of electrical network, and isolate
Electrical network and alternating current electronic load.
Preferably, described grid side LC wave filter 12 includes that the one end three-phase respectively with described grid side transformator 11 exports
Hold three the grid side inductance components connected, be connected in parallel between the first phase of grid side transformator 11 and the second phase output terminal
The first electric capacity, the second electric capacity being connected in parallel between the second phase of grid side transformator 11 and third phase outfan and also
The 3rd electric capacity that connection is connected between the first phase of grid side transformator 11 and third phase outfan.Described grid side LC wave filter
12 constitute LCL third-order filter with described grid side transformator 11, the harmonic wave produced thoroughly to filter grid side inverter 13 to say
Electric current and peak voltage, it is ensured that input harmonic current total distortion degree THDi≤5% of grid side, to meet public electric wire net power supply
Prescription.
Preferably, described grid side inverter 13 is a three-phase full-bridge inverter, it may also be said to be a PWM rectifier, its
The three-phase input end other end with three grid side inductance components of described grid side LC wave filter 12 respectively is connected.
Specifically, described load side electrical circuitry 2 includes load-side inverter 23, load-side LC wave filter 22 and load-side transformation
Device 21.The dc bus end of described load-side inverter 23 is connected with the dc bus end of described grid side inverter 13, and it is defeated
Enter end to be connected with the outfan of described load-side LC wave filter 22；The outfan of described load-side transformator 21 and described load-side
The input of LC wave filter 22 connects, and the exchange that its input accesses test equipment by switch 4 as alternating current electronic load is defeated
Go out end.
Preferably, described load-side inverter 23 is a three-phase full-bridge inverter, and its dc bus is inverse with described grid side
The dc bus becoming device 13 connects.
Preferably, described load-side transformator 21 is three-phase transformer, and its three-phase input end is respectively by making after a switch
For alternating current electronic load access test equipment ac output end, and its according to load voltage source standard buck or boost to institute
State the running voltage of load-side inverter 23, and isolate tested formula equipment and alternating current electronic load.
Preferably, described load-side LC wave filter 22 includes three load-side inductance components, is connected in parallel in load-side change
The 4th electric capacity between first phase and second phase output terminal of depressor 21, be connected in parallel in load-side transformator 21 the second phase and
The 5th electric capacity between third phase outfan and be connected in parallel in the first phase of load-side transformator 21 and third phase outfan it
Between the 6th electric capacity.Described three load-side inductance component one end are respectively with the three-phase output end of described load-side transformator 21 even
Connecing, other end three-phase input end with described load-side inverter 23 respectively is connected.Described load-side LC wave filter 22 is with described
Load-side transformator 21 constitutes LCL third-order filter, thoroughly to filter harmonic wave electricity produced by load-side three-phase full-bridge inverter
Stream and peak voltage.
When load-side zero load, the duty of described grid side inverter 13 is the rectification state at third and fourth quadrant,
And the DC voltage size that the voltage swing of its dc bus is corresponding equal to grid side alternating voltage；Load-side produces load current
Time, the duty of grid side inverter 13 is the inverter mode of first and second quadrant, and the voltage of its dc bus is higher than grid side
The DC voltage that alternating voltage is corresponding, and the electric energy feedback electrical network that load current is produced.
It addition, by changing grid side transformator 11 and the voltage ratio size of load-side transformator 21, both sides can be realized and appoints
The voltage input of the different voltage levels of meaning.
Hereinafter, the circuit work of the energy feedback AC electronic load device of summary this utility model width input and output voltage
Principle:
First, adjust according to the line voltage levels of grid side and connect the corresponding voltage spindle nose of grid side transformator 11, make
The input voltage of grid side transformator 11 is consistent with electrical network, can close the switch 3 of grid side after adjustment.
It is then detected that the voltage and current signal of grid side, in conjunction with Digital Phase-Locked Loop Technology and Direct Current Control PWM
Whole flow control technology, generates the SVPWM with synchronized and drives signal, and to drive grid side inverter 13, now, grid side is inverse
Become the voltage stabilization of dc bus of device 13 at the DC voltage value corresponding with grid side alternating voltage.
Subsequently, adjust according to the line voltage levels of load-side and connect the corresponding voltage tap of load-side transformator 21, make
The input voltage of load-side transformator 21 is consistent with electrical network, can close load side switch after adjustment.
Then, the voltage and current signal of detection load-side, in conjunction with Digital Phase-Locked Loop Technology and Direct Current Control PWM
Whole flow control technology, generates the SVPWM Tong Bu with load-side output and drives signal, to drive load-side inverter 23.Now, adjust
The DC voltage setting value of whole load-side inverter 23 (i.e. load-side PWM rectifier), then load-side inverter 23 produces continuously
Adjustable load current.And adjust the phase angle of load current, make load-side PWM rectifier be operated in the rectification of third and fourth quadrant
State, the power factor making load-side is 1 or the most adjustable.
Now carrying state owing to load-side inverter 23 is in PWM commutating zone, its DC bus-bar voltage is higher than electrical network top-cross
The DC voltage value that stream voltage is corresponding, grid side inverter 13 is in PWM commutation inversion state, then by load-side inverter 23
Produce is electric energy loaded to electrical network feedback generating.Now, adjusting the phase angle of grid side electric current, the power factor making grid side is 1.
Further, increasing isolated island defencive function in the control of grid side inverter 13, when grid disruption, hard stop is protected
Protect.
Relative to prior art, the energy feedback AC electronic load device of this utility model width input and output voltage passes through
Use the most double PWM rectification inverter circuit, the electric energy 100% of simulation load is fed back to electrical network, saves the energy；And realize negative
Carry being precisely controlled of circuit Automatic continuous, to produce the load current containing harmonic components or any load the most easily
The load current of character, has fully met the test requirements document of high performance load pattern；And by dividing in grid side and load-side
Not equipped with the transformator of pressure-adjustable, meet the access of both sides different electrical power standard, it is achieved the energy feedback of wide input and output voltage
Alternating current electronic load function, overcomes the existing simulation load equipment being made up of power resistor, water resistance, reactor, capacitor
Shortcoming and defect in technology.
This utility model is not limited to above-mentioned embodiment, if do not taken off various changes of the present utility model or deformation
From spirit and scope of the present utility model, if these are changed and deformation belongs to claim of the present utility model and equivalent technologies
Within the scope of, then this utility model is also intended to comprise these changes and deformation.
Claims (9)
1. the energy feedback AC electronic load device of a wide input and output voltage, it is characterised in that: its circuit structure includes
Grid side circuit and load side electrical circuitry；
Described grid side circuit includes grid side transformator, grid side LC wave filter and grid side inverter；Described grid side becomes
The input of depressor accesses electrical network by switch, and its outfan is connected with the input of described grid side LC wave filter；Described electricity
The input of net side inverter is connected with the outfan of described grid side LC wave filter, and its dc bus terminates into described load-side
Circuit；
Described load side electrical circuitry includes load-side inverter, load-side LC wave filter and load-side transformator；Described load-side is inverse
The dc bus end becoming device is connected with the dc bus end of described grid side inverter, and its input filters with described load-side LC
The outfan of device connects；The outfan of described load-side transformator is connected with the input of described load-side LC wave filter, and it is defeated
Enter end and accessed the ac output end of test equipment by switch as alternating current electronic load；
The switch of the switch of grid side and described grid side circuit and described load side electrical circuitry and load-side collectively forms back-to-back
Double PWM rectification inverter circuits.
The energy feedback AC electronic load device of wide input and output voltage the most according to claim 1, it is characterised in that:
Described grid side transformator is three-phase transformer, and its three-phase input end accesses electrical network by a switch respectively, and it is according to electrical network
Voltage source standard buck or boost to the running voltage of described grid side inverter, and isolate electrical network and alternating current electronic load.
The energy feedback AC electronic load device of wide input and output voltage the most according to claim 2, it is characterised in that:
Described grid side LC wave filter includes three grid side that the one end three-phase output end respectively with described grid side transformator is connected
Inductance component, the first electric capacity being connected in parallel between the first phase of grid side transformator and the second phase output terminal, it is connected in parallel
The second electric capacity between second phase and third phase outfan of grid side transformator and be connected in parallel in grid side transformator
The 3rd electric capacity between first phase and third phase outfan；
Described grid side LC wave filter constitutes LCL third-order filter with described grid side transformator.
The energy feedback AC electronic load device of wide input and output voltage the most according to claim 3, it is characterised in that:
Described grid side inverter is a three-phase full-bridge inverter, its three-phase input end respectively with three of described grid side LC wave filter
The other end of grid side inductance component connects.
The energy feedback AC electronic load device of wide input and output voltage the most according to claim 4, it is characterised in that:
Described load-side inverter is a three-phase full-bridge inverter, the dc bus phase of its dc bus and described grid side inverter
Connect.
The energy feedback AC electronic load device of wide input and output voltage the most according to claim 5, it is characterised in that:
Described load-side transformator is three-phase transformer, and its three-phase input end is respectively by accessing as alternating current electronic load after a switch
The ac output end of test equipment, and it is according to the work of the voltage source standard buck or boost extremely described load-side inverter of load
Make voltage, and isolate tested formula equipment and alternating current electronic load.
The energy feedback AC electronic load device of wide input and output voltage the most according to claim 6, it is characterised in that:
Described load-side LC wave filter includes three load-side inductance components, is connected in parallel in first phase and second of load-side transformator
The 4th electric capacity between phase output terminal, the 5th be connected in parallel between the second phase of load-side transformator and third phase outfan
Electric capacity and the 6th electric capacity being connected in parallel between the first phase of load-side transformator and third phase outfan；
Described three load-side inductance component one end three-phase output end with described load-side transformator respectively is connected, and the other end divides
It is not connected with the three-phase input end of described load-side inverter；
Described load-side LC wave filter constitutes LCL third-order filter with described load-side transformator.
8. according to the energy feedback AC electronic load device of the wide input and output voltage described in any one of claim 1～7, its
Being characterised by: during load-side zero load, the duty of grid side inverter is the rectification state at third and fourth quadrant, and it is straight
The voltage swing of stream bus is equal to the DC voltage size that grid side alternating voltage is corresponding；When load-side produces load current,
The duty of grid side inverter is the inverter mode of first and second quadrant, and the voltage of its dc bus is higher than grid side
The DC voltage that alternating voltage is corresponding, and the electric energy feedback electrical network that load current is produced.
9. according to the energy feedback AC electronic load device of the wide input and output voltage described in any one of claim 1～7, its
It is characterized by changing grid side transformator and the voltage ratio size of load-side transformator, it is achieved both sides different electricity arbitrarily
Other voltage of arbitrarily downgrading inputs.
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| CN106841874A (en) * | 2017-03-01 | 2017-06-13 | 国网江西省电力公司电力科学研究院 | A kind of anti-isolated island test device of photovoltaic combining inverter electronics |
| CN106941259A (en) * | 2017-05-05 | 2017-07-11 | 秦伟喆 | A kind of line segment formula three-phase load unbalance adjustment and boosting loss-reducing and electricity-saving device |
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| CN110676875A (en) * | 2019-10-11 | 2020-01-10 | 南京理工大学 | Active energy feedback type load realized based on industrial frequency converter and control method |
| CN112014664A (en) * | 2020-08-03 | 2020-12-01 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Comprehensive saturable reactor current test device and test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106841874A (en) * | 2017-03-01 | 2017-06-13 | 国网江西省电力公司电力科学研究院 | A kind of anti-isolated island test device of photovoltaic combining inverter electronics |
| CN106841874B (en) * | 2017-03-01 | 2023-05-16 | 国网江西省电力公司电力科学研究院 | Electronic anti-islanding testing device for photovoltaic grid-connected inverter |
| CN106941259A (en) * | 2017-05-05 | 2017-07-11 | 秦伟喆 | A kind of line segment formula three-phase load unbalance adjustment and boosting loss-reducing and electricity-saving device |
| CN108303259A (en) * | 2017-11-23 | 2018-07-20 | 浙江派尼尔科技股份有限公司 | A kind of electricity feed-back type put-put testboard and test method |
| CN110676875A (en) * | 2019-10-11 | 2020-01-10 | 南京理工大学 | Active energy feedback type load realized based on industrial frequency converter and control method |
| CN110676875B (en) * | 2019-10-11 | 2022-09-13 | 南京理工大学 | Active energy feedback type load realized based on industrial frequency converter and control method |
| CN112014664A (en) * | 2020-08-03 | 2020-12-01 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Comprehensive saturable reactor current test device and test method |
| CN112014664B (en) * | 2020-08-03 | 2022-01-21 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Comprehensive saturable reactor current test device and test method |
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