CN105490313B - A kind of alternating current-direct current shared electron load - Google Patents
A kind of alternating current-direct current shared electron load Download PDFInfo
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- CN105490313B CN105490313B CN201510844784.0A CN201510844784A CN105490313B CN 105490313 B CN105490313 B CN 105490313B CN 201510844784 A CN201510844784 A CN 201510844784A CN 105490313 B CN105490313 B CN 105490313B
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Abstract
The present invention relates to a kind of load of alternating current-direct current shared electron, alternating current-direct current shared electron load includes AC/DC power cell, DC/DC power cell, DC/AC power cell, ac input end and direct-flow input end；Wherein, the input terminal of AC/DC power cell is connected with ac input end；The input terminal of DC/DC power cell is connected with direct-flow input end；The output end of AC/DC power cell and DC/DC power cell accesses DC bus, and DC bus is by access DC/AC power cell for connecting power grid；Wherein, switch has been respectively connected between AC/DC power cell and ac input end and between DC/DC power cell and direct-flow input end.Alternating current-direct current shared electron load proposed by the present invention can change the transmission of electric energy in power of alterating and direct current on demand, keep load application more comprehensive, have stronger applicability.
Description
Technical field
The present invention relates to a kind of loads of alternating current-direct current shared electron, suitable for loading the technical field of access AC network.
Background technique
Load is the important component of power-supply system, the important indicator of power quality is measured, especially in power-supply device
It researches and develops in test experiments, it is often necessary to using load and power of alterating and direct current coordinative composition of equipments, be connected to power of alterating and direct current output and electricity
Between net, power of alterating and direct current electric energy feedback to power grid, for simulating actual working environment load.Traditional is mostly that purely resistive is negative
It carries, this load be easy to cause power supply output energy to be converted into thermal energy consumption in vain and fall, and increases the research and development test of power-supply device
Cost；Also one is DC Electronic Loads, but DC Electronic Loads have the shortcomings that low efficiency, harmonic content are big, in this way
It will lead to imbalance and be fed back to power grid, be easy to pollute power grid.Therefore, it in order to make up such defect, is connect carrying out load
Enter the way of output in power grid test frequently with alternating current-direct current to change into three-phase equilibrium AC energy and be delivered to power grid, still, existing skill
Using during power of alterating and direct current electric energy feedback to power grid in art, it can not achieve and alternating current and direct current are carried out flexibly
Control, leads to load that enforceable operating mode is single, is unfavorable for the test for complex AC/DC power supply.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, propose a kind of alternating current-direct current shared electron load, solve
Load carries out problem poor for applicability when electric energy feedback to power grid is tested to power of alterating and direct current.
The present invention is achieved by following scheme：
A kind of alternating current-direct current shared electron load, which is characterized in that the alternating current-direct current shared electron load includes AC/DC function
Rate unit, DC/DC power cell, DC/AC power cell, ac input end and direct-flow input end；Wherein, AC/DC power cell
Input terminal be connected with ac input end；The input terminal of DC/DC power cell is connected with direct-flow input end；AC/DC power cell
DC bus is accessed with the output end of DC/DC power cell, DC bus is by access DC/AC power cell for connecting electricity
Net；Wherein, it is connect respectively between AC/DC power cell and ac input end and between DC/DC power cell and direct-flow input end
Enter to have switch.
Further, the circuit structure in the AC/DC power cell is tri-level single phase full-bridge circuit；Described
Circuit structure in DC/DC power cell is Buck-Boost circuit；Circuit structure in the AC/DC power cell is three
Level Full Bridge inverter circuit.
Further, also access has AC fuse, LCL filter circuit at AC/DC power cell and its ac input end
With the precharge branch for being connected in parallel on switch ends；Also access has DC fuse at DC/DC power cell and its direct-flow input end
With the precharge branch for being connected in parallel on switch ends.
Further, it is further connected with LCL filter circuit, breaker between the output end and power grid of DC/AC power cell and melts
Disconnected device.
Further, the master board that the alternating current-direct current shared electron load uses is by digital signal processor DSP complexity
Programmable logic element CPLD composition and 2 digital signal processor DSPs；Wherein, 2 digital signal processor DSPs are respectively：
Logic number Signal Processing Element LOGIC DSP and control signal processing CONTROL DSP, and be respectively connected to complex programmable and patrol
Collect the corresponding port element CPLD；AC/DC power cell, DC/DC power cell and DC/AC power cell can also be compiled with complexity
The corresponding port connection of journey logic element CPLD
The beneficial effect of the present invention compared to the prior art is：
The invention proposes a kind of load of alternating current-direct current shared electron, be respectively arranged in the load DC/DC power cell,
AC/DC power cell and DC/AC power cell；The working method of the load uses two-dimensional transform formula, wherein AC/DC power list
The ac input end of member is connected with AC power source, by the AC rectification of acquisition at direct current；The direct-flow input end of DC/DC power cell
It is connected with DC power supply, the output of AC/DC power cell and DC/DC power cell is terminated on bus, and bus passes through access DC/
AC power cell is converted to three-phase equilibrium electrical energy transportation to power grid for connecting power grid, by alternating current source, DC source output, exchanges defeated
Enter and be all connected to switch between end and AC/DC power cell and direct-flow input end and DC/DC power cell, a variety of answer may be implemented
With mode, i.e. single-phase DC output, single phase ac output and alternating current-direct current output.Alternating current-direct current shared electron load proposed by the present invention
The transmission that electric energy in power of alterating and direct current can be changed on demand keeps load application more comprehensive, has stronger applicability.
Alternating current-direct current shared load proposed by the present invention converts electrical energy into thermal energy consumption relative to conventional load and will be single
Phase power of alterating and direct current dress is changed to single-phase uneven electrical energy transportation to power grid, with efficiency of transmission is high, harmonic content is low, reduces energy
The advantages that consumption.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of shared DC/AC electronic load of the embodiment of the present invention；
Fig. 2 is the AC/DC power cell circuit topology figure of the embodiment of the present invention；
Fig. 3 is the DC/DC power cell circuit topology figure of the embodiment of the present invention；
Fig. 4 is the DC/AC power cell circuit topology figure of the embodiment of the present invention；
Fig. 5 is the way circuit topological diagram of the shared DC/AC electronic load of the embodiment of the present invention；
Fig. 6 is the AC/DC power cell control block diagram of the embodiment of the present invention；
Fig. 7 is the DC/DC power cell control block diagram of the embodiment of the present invention；
Fig. 8 is the DC/AC power cell control block diagram of the embodiment of the present invention；
Fig. 9 is the control block diagram of the master board of the embodiment of the present invention；
Figure 10 is the coordinated control of AC/DC, DC/DC, DC/AC power cell of the embodiment of the present invention, protects
Shield and messaging diagrams.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawings and examples.
(1) a kind of alternating current-direct current shared electron load
A kind of alternating current-direct current shared electron load of the present invention, as shown in Figure 1, the electronic load mainly includes：AC/DC
Power cell, DC/DC power cell, DC/AC power cell, ac input end and direct-flow input end.Wherein, AC/DC power list
The input terminal of member is connected with ac input end；The input terminal of DC/DC power cell is connected with direct-flow input end；AC/DC power list
First, DC/DC power cell output end is linked on DC bus, and DC bus is by access DC/AC power cell for connecting
It is connected on power grid, realizes the electric energy feedback of power of alterating and direct current to power grid.Wherein, AC/DC power cell and ac input end it
Between and DC/DC power cell and direct-flow input end between be respectively connected to switch.Below with regard to the specific structure of modules into
Row detailed description：
1) AC/DC power cell：As shown in Fig. 2, the circuit topology figure in AC/DC power cell mainly uses tri-level single
Phase full-bridge circuit, the ac input end L and N-terminal of AC/DC power cell are respectively connected to DC power supply, using three level high-frequencies
Single phase ac is rectified into direct current by PWM technology；At the ac input end of AC/DC power cell also access have fuse, switch,
Precharge branch, LCL filter circuit with switch in parallel,
2) DC/DC power cell：As shown in figure 3, the circuit topology figure in DC/DC power cell is using Buck-Boost electricity
Line structure, the Buck-Boost circuit structure in the present embodiment mainly includes 2 IGBT elements and 1 inductance element is：2
One end of IGBT element is sequentially connected in series, and the other end is respectively connected to the anode and negative terminal of DC bus, inductance element and 2 IGBT members
The tie point of part is connected；The direct-flow input end DC+ and DC- of DC/DC power cell are respectively connected to DC power supply, DC power supply output
Electric current busbar voltage can be risen to by the Buck-Boost circuit in DC/DC power cell.In the defeated of DC/DC power cell
Inbound port also accesses the precharge branch for having DC fuse, switch and switch in parallel.
3) DC/AC power cell：As shown in figure 4, the circuit topology figure in DC/AC power cell mainly uses in three level
Point clamper (NPC) circuit topology, the end input terminal DC+ and DC- of DC/AC power cell are connected to the positive and negative terminal on bus,
The output end of DC/AC power cell is connected by LCL filter circuit, breaker and fuse with power grid；DC power supply with exchange
Power supply passes through AC/DC power cell and DC/DC power cell respectively and electric current is transmitted to DC/AC power cell, DC/AC through bus
Power cell is three-phase equilibrium alternating current by the three Level Full Bridge inversion of " 1 " type and is fed back to power grid.
DC/AC power cell in the present embodiment uses Active Power Factor Correction Technology and Active Power Filter Technology, net side
Power factor up to 0.999 or more, Current harmonic distortion rate will not generate harmonic pollution to power grid less than 3%.
The specific working mode of alternating electron shared load is：Electric current is transferred to AC/DC power by ac input end
AC rectification is direct current through AC/DC power cell and is transferred to bus by unit；Electric current is transferred to by direct-flow input end again
Voltage is risen to busbar voltage through DC/DC power cell and is transferred to bus by DC/DC power cell.Bus will be obtained respectively
Electric current from ac input end and direct-flow input end is three-phase through the three Level Full Bridge inversion of " 1 " type by DC/AC power cell
Symmetrical alternating current electricity is fed back to power grid.
The present invention passes through between the switch and direct-flow input end and DC/DC between control ac input end and AC/DC
Switch realizes three kinds of different application modes to straight AC load device：1) single phase ac exports：It opens at AC/DC power cell
Switch, close DC/DC power cell at switch；2) single-phase DC exports：The switch at AC/DC power cell is closed, is opened
Open the switch at DC/DC power cell；3) alternating current-direct current exports：The switch and DC/DC power being all turned at AC/DC power cell
Switch at unit.
The master board that alternating current-direct current shared electron loads in the present embodiment mainly includes complex programmable logic element CPLD
With 2 digital Signal Processing Element DSP.Wherein, CPLD is the logical execution units of DSP, 2 digital Signal Processing Element difference
For logic number Signal Processing Element LOGIC DSP and control Signal Processing Element CONTROL DSP, two number letters
Number processing element is respectively connected to the corresponding port CPLD, AC/DC power cell, DC/DC power cell and DC/AC power cell
It is similarly linked into the corresponding port CPLD, the drive control transmitted to electric current, LOGIC DSP are realized in the master board of the load
The specific working principle is as follows with CONTROL DSP：
LOGIC DSP mainly executes logical sequence function and communication data exchange (RS485, CAN communication) and protection is patrolled
Volume, it is as follows respectively：
1) communication process：The Txd signal that LOGIC DSP is sent in communication data exchange process gives the receiving end CPLD I/O
Mouthful, CPLD passes through I/O output port again and is sent to CAN receiving module；Received Rxd signal is sent to CPLD's by CAN module
Receiving end I/O mouthfuls, CPLD passes through again gives LOGIC DSP on I/O output port, completes a communication process.
2) process is protected：During protection CPLD by the end I/O open into fault-signal I_OVER_CPLD exchange hardware
Fault-signal, BUS_OV_CPLD direct current hardware over-voltage fault-signal, POWER_FAULT_CPLD accessory power supply fault-signal,
FAN_FAULT_CPLD cooling fan fault-signal, FUSE_FAULT_CPLD power module OC fault-signal, SINF_FAULT_
CPLD radiator overheating fault signal, by the port I/O LogicGpio7, LogicGpio16, LogicGpio17,
LOGIC DSP is given on LogicGpio18, LogicGpio26, LogicGpio27, LOGIC DSP receives the event that CPLD is uploaded
Barrier status signal analysis processing makes equipment alarm or shutdown, to realize the protection to equipment.
CONTROL DSP mainly execute complete control algolithm function and and information exchange, CONTROL dsp control signal
By CPLD I/O port ControllerGpio7, ControllerGpio16, ControllerGpio17,
ControllerGpio18、ControllerGpio20、ControllerGpio21、ControllerGpio22、
ControllerGpio23 controls the CLOCK_CPLD hardware reset of infrastructure device, MAIN_CONTROL_CPLD exchanges main contact
Device, SOFT_CONTROL_CPLD exchange preliminary filling electric control, IO_O1_CPLD mainstream main contactor, Contactor_CPLD direct current
Precharge, the output of FAN_CONTROL_CPLD radiator fan, I_A_CPLD synchronization signal, I_C_CPLD switching on and shutting down signal export
The purposes such as control and AD sampled data discretization, control algolithm and the generation of PWM pulse width modulated wave.
How illustrating for electric energy transmission is carried out under the driving of control mainboard with regard to each power module below：
As shown in fig. 6, used in the current loop control circuit based on PI control strategy in the AC/DC, it will be defeated from exchanging
The current value and error signal current value for entering end acquisition are compared, and obtained deviation is converted to voltage ginseng after pi regulator
Signal is examined, after being superimposed DC bus-bar voltage, the signal value of output is obtained into output according to the pulse signal of load after processing and is opened
OFF signal value.As shown in fig. 7, direct current inputs DC/DC control mode with the control mode of AC/DC.As shown in figure 8, for DC/AC
Control mode in, by above-mentioned AC/DC control and DC/DC control in the way of, using the outer voltage electric current controlled based on PI
Inner loop control strategy, after busbar voltage ring and bus current ring output signal superposition DC bus-bar voltage, the pulse of root load
Signal is final to obtain required switching signal value through handling.
Under the thinking that the present invention provides, to above-mentioned implementation by the way of being readily apparent that those skilled in the art
Technological means in example is converted, is replaced, is modified, and is played the role of and the basic phase of relevant art means in the present invention
Goal of the invention that is same, realizing is also essentially identical, and the technical solution formed in this way is to be finely adjusted to be formed to above-described embodiment, this
Kind technical solution is still fallen in protection scope of the present invention.
Claims (4)
1. a kind of alternating current-direct current shared electron load, which is characterized in that the alternating current-direct current shared electron load includes AC/DC power
Unit, DC/DC power cell, DC/AC power cell, ac input end and direct-flow input end；Wherein, AC/DC power cell
Input terminal is connected with ac input end；The input terminal of DC/DC power cell is connected with direct-flow input end；AC/DC power cell and
The output end of DC/DC power cell accesses DC bus, and DC bus is by access DC/AC power cell for connecting power grid；
Wherein, it is respectively connected between AC/DC power cell and ac input end and between DC/DC power cell and direct-flow input end
There is switch；The master board that the alternating current-direct current shared electron load uses is by 2 digital signal processor DSPs and complex programmable
Logic element CPLD composition；Wherein, 2 digital signal processor DSPs are respectively：Logic number Signal Processing Element LOGIC
DSP and control signal processing CONTROL DSP, and it is respectively connected to the corresponding port complex programmable logic element CPLD；AC/DC
Power cell, DC/DC power cell and DC/AC power cell also connect with the corresponding port complex programmable logic element CPLD
It connects；The AC/DC power cell, DC/DC power cell and DC/AC power cell carry out electric energy biography under the driving of master board
Defeated process is：The AC/DC power cell will be inputted using in the current loop control circuit based on PI control strategy from exchange
The current value obtained and alternating current reference value is held to be compared, obtained deviation is converted to Voltage Reference after pi regulator
The signal value of output after being superimposed DC bus-bar voltage, is obtained output switch according to the pulse signal of load by signal after processing
Signal value；The DC/DC power cell will be obtained using in the current loop control circuit based on PI control strategy from direct-flow input end
The current value and DC current reference value taken is compared, and obtained deviation is converted to Voltage Reference letter after pi regulator
Number, after being superimposed DC bus-bar voltage, the signal value of output is obtained into output switch letter according to the pulse signal of load after processing
Number value；The DC/AC power cell uses the outer voltage current inner loop control strategy that control based on PI, by busbar voltage ring with
After bus current ring output signal is superimposed DC bus-bar voltage, according to the pulse signal of load through handling, needed for final acquisition
Switching signal value.
2. a kind of alternating current-direct current shared electron load according to claim 1, which is characterized in that the AC/DC power list
Circuit structure in member is tri-level single phase full-bridge circuit；Circuit structure in the DC/DC power cell is Buck-
Boost circuit；Circuit structure in the AC/DC power cell is three Level Full Bridge inverter circuits.
3. a kind of alternating current-direct current shared electron load according to claim 1, which is characterized in that AC/DC power cell and its
Also access has AC fuse, LCL filter circuit and the precharge branch for being connected in parallel on switch ends at ac input end；DC/DC
Also access has DC fuse and is connected in parallel on the precharge branch of switch ends at power cell and its direct-flow input end.
4. a kind of alternating current-direct current shared electron load according to claim 1, which is characterized in that DC/AC power cell it is defeated
LCL filter circuit, breaker and fuse are further connected between outlet and power grid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510844784.0A CN105490313B (en) | 2015-11-27 | 2015-11-27 | A kind of alternating current-direct current shared electron load |
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| CN201510844784.0A CN105490313B (en) | 2015-11-27 | 2015-11-27 | A kind of alternating current-direct current shared electron load |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2791657Y (en) * | 2004-10-29 | 2006-06-28 | 山东大学 | Electric load general simulation device |
| CN2805210Y (en) * | 2005-03-16 | 2006-08-09 | 刘文辉 | Main circuit for high energy feed back type electronic loading device |
| CN203786272U (en) * | 2013-12-04 | 2014-08-20 | 中国电子科技集团公司第五十研究所 | AAAAAC-DC dual-purpose test load |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012170303A (en) * | 2011-02-16 | 2012-09-06 | Ricoh Co Ltd | Electronic product mounting ac/dc power supply ic, method of supplying power thereto, and power circuit |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2791657Y (en) * | 2004-10-29 | 2006-06-28 | 山东大学 | Electric load general simulation device |
| CN2805210Y (en) * | 2005-03-16 | 2006-08-09 | 刘文辉 | Main circuit for high energy feed back type electronic loading device |
| CN203786272U (en) * | 2013-12-04 | 2014-08-20 | 中国电子科技集团公司第五十研究所 | AAAAAC-DC dual-purpose test load |
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