CN108631440A - A kind of long-range transformer substation system based on photovoltaic generation - Google Patents
A kind of long-range transformer substation system based on photovoltaic generation Download PDFInfo
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- CN108631440A CN108631440A CN201810449228.7A CN201810449228A CN108631440A CN 108631440 A CN108631440 A CN 108631440A CN 201810449228 A CN201810449228 A CN 201810449228A CN 108631440 A CN108631440 A CN 108631440A
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- 238000001514 detection method Methods 0.000 claims abstract description 4
- 230000005611 electricity Effects 0.000 claims description 14
- 239000004065 semiconductor Substances 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000015556 catabolic process Effects 0.000 claims description 5
- 230000001131 transforming effect Effects 0.000 claims description 5
- 230000009466 transformation Effects 0.000 claims description 4
- 230000001960 triggered effect Effects 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 230000006837 decompression Effects 0.000 claims description 3
- 238000004146 energy storage Methods 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims description 3
- 230000010363 phase shift Effects 0.000 claims description 3
- 208000035126 Facies Diseases 0.000 claims 1
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
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- 239000000779 smoke Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical group [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- -1 boron atom Chemical compound 0.000 description 1
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
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Classifications
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- H02J13/0075—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
- H02H9/047—Free-wheeling circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/16—Electric power substations
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Abstract
The present invention relates to transformer substation systems,More particularly to a kind of long-range transformer substation system based on photovoltaic generation,Including overvoltage crowbar,ZigBee communication modular circuit,Hf switching power supply and induction alarm for high voltage circuit,The effect of ZigBee communication module is LAN effect,For connecting the control terminal in LAN,It is used for transmission signal,Control primary circuit is gone to by secondary circuit,Control the switch of substation,Overvoltage crowbar is arranged on output circuit,For preventing output voltage excessive,Cause the damage of substation's delivery port electrical appliance,Hf switching power supply is used to control the total power switch of substation,Hf switching power supply includes phase shifting control full-bridge circuit and control circuit,Induction alarm for high voltage circuit is used to detect the situation when mistake high pressure in substation,Detection high pressure leaky simultaneously notifies staff to close total power switch in time by way of alarm,Security performance higher of the present invention,Control is more convenient,With very strong creativeness.
Description
Technical field
The present invention relates to transformer substation system technical fields, and in particular to a kind of system of long-range substation based on photovoltaic generation
System.
Background technology
Photovoltaic generation is a kind of skill that luminous energy is directly translated into electric energy using the photovoltaic effect of interface
Art.It is mainly made of solar panel (component), controller and inverter three parts, critical piece is by electronic component structure
At.Solar cell carries out packaging protection after series connection can form the solar module of large area, then matches and close power control
The components such as device processed are formed photovoltaic power generation apparatus.The cardinal principle of photovoltaic generation is the photoelectric effect of semiconductor.Photon irradiation
When on to metal, its energy can all be absorbed by some electronics in metal, and the energy of Electron absorption is sufficiently large, can overcome gold
Belong to internal gravitation acting, leaves metal surface and escape, become photoelectron.Silicon atom has 4 outer-shell electrons, if in pure silicon
In be mixed with the atom such as phosphorus atoms of 5 outer-shell electrons, just become N-type semiconductor；If being mixed with 3 outer-shell electrons in pure silicon
Atom such as boron atom, formed P-type semiconductor.When p-type and N type junction are combined, contact surface will form potential difference, become
Solar cell.After solar irradiation is mapped to P-N junction, hole is moved from the polar regions P toward the polar regions N, and electronics is moved from the polar regions N to the polar regions P
It is dynamic, form electric current.Photoelectric effect, which is exactly illumination, to be made to produce between the different parts that inhomogeneos semiconductor or semiconductor combined with metal
The phenomenon that raw potential difference.It is first electronics is converted by photon (light wave), light energy is converted into the process of electric flux；Secondly,
It is to form voltage course.Currently, substation is more and more disposed in the public places such as cell, however these substations due to
It is distributed more, special administrator can not be arranged to be managed it, it is therefore necessary to remote monitoring system is installed to substation,
But existing substation cannot open door when there is dangerous situation in time, give disaster relief processing so that dangerous situation cannot control, and make
At the loss of bigger, and substation is and its important place, needs the unified management of more specification.In Patent No.
In the patent document of CN201610638092, a kind of substation's tele-control system, including door, substation's main body, police are disclosed
Report lamp, photographic device, electronic lock, Interface, smoke sensor device, temperature sensor, controller, processor, storage device, nothing
Limit network, remote monitoring end and radiator, substation's main body are equipped with door, and electronic lock is equipped on the door, described
The top of Interface on electronic lock, the door is equipped with warning light and photographic device, and substation's body interior is equipped with control
Device, the controller are electrically connected with radiator, alarm lamp, electronic lock and processor respectively, the processor respectively with storage
Device, Interface, smoke sensor device, temperature sensor and photographic device electrical connection, the processor by wireless network with
Remote monitoring end connects, beneficial effects of the present invention：Can have from remote control terminal and be controlled on the door, make original control system
System has obtained great optimization, meets requirement of the power supply department to substation.
Above-mentioned patent document can have from remote control terminal and be controlled on the door, make original by the way that tele-control system is arranged
Some control systems have obtained great optimization, meet requirement of the power supply department to substation.But for how to provide one
Kind of simple in structure, security performance higher, control more easily the long-range transformer substation system based on photovoltaic generation lack it is technical
Solution.
Invention content
(1) the technical issues of solving
In view of the deficiencies of the prior art, the present invention provides a kind of long-range transformer substation system based on photovoltaic generation, is used for
How solution provides a kind of simple in structure, security performance higher, controls the more easily long-range substation based on photovoltaic generation
The problem of system.
(2) technical solution
In order to achieve the above object, the present invention is achieved by the following technical programs：
A kind of long-range transformer substation system based on photovoltaic generation, including photovoltaic circuit, inverter circuit and transforming plant primary electricity
Road, the inverter circuit are used to photovoltaic generation being converted to alternating current, and the photovoltaic circuit is for connecting and supplying electricity to the change
Power station primary circuit, it is characterised in that：Including overvoltage crowbar, ZigBee communication modular circuit, hf switching power supply
With induction alarm for high voltage circuit, the ZigBee communication module effect is the effect of LAN, for connecting the control in LAN
Terminal processed, is used for transmission signal, and control primary circuit is gone to by secondary circuit, that is, controls the switch of substation, and the overvoltage is protected
Protection circuit is arranged on output circuit, for preventing output voltage excessive, causes the damage of substation's delivery port electrical appliance, institute
Total power switch of the hf switching power supply for controlling substation is stated, the hf switching power supply includes phase shifting control
Full-bridge circuit and control circuit, the induction alarm for high voltage circuit are used to detect the situation when mistake high pressure in substation,
Detection high pressure leaky simultaneously notifies staff to close total power switch in time by way of alarm.
Preferably, the ZigBee communication modular circuit main controlled node uses MSP430 super low power consuming single chip processors, MCU's
P3.4, P3.5 pin are set as asynchronous serial transceiver interface, and asynchronous serial communication, microcontroller are carried out with the ZigBee module of node
Collected data are sent to ZigBee module, and the wireless data that ZigBee module receives also can pellucidly be sent to
MCU。
Preferably, 31,32,33,34 pins of the CC2420 of the ZigBee communication modular circuit are corresponding with microcontroller
SPI communication interface is connected, i.e. SET0, SMCLK, SIMO0, SOMI0 of CSn, SCLK of CC2420, SI, SO, pin and MSP430
Pin is connected, in this way, CC2420 transmitting chips can carry out the communication of full duplex, 27 pins with MCU (SFD notes start delimiter)
It is connected with the TimeCapture pins of MCU, 28 pins (CCA idle-channel evaluations) are connected with the one of pins of MCU, MCU
Idle channel can be judged whether there is by the reading to the pin state.
Preferably, after 220V substations are exported electricity decompression current limliting by the overvoltage crowbar capacitor C1, by diode
VD1, VD2 rectification, capacitor C2 serve as filtering, obtain the DC voltage of 12V or so, when network voltage is normal, two pole of voltage stabilizing
Pipe VDW breakdown cannot be connected, and triode VT is in cut-off state at this time, and bidirectional triode thyristor VS is connected by voltage triggered face.
Preferably, if network voltage increases suddenly, more than 250V, the voltage at the midpoints RP results in VDW to puncture at this time
Conducting after VDW conductings, and makes triode VT conductings, and after VT conductings, the pressure drop very little of Collector Emitter is not enough to
VS is triggered, and VS is caused to end, therefore the household electrical appliances power-off in socket XS is stopped, thus plays the purpose of protection, once
Network voltage declines, and VT ends again, and the collector potential of VT increases, and triggers VS conductings.
Preferably, the phase shifting control full-bridge circuit, mainly by four identical power tubes and a high frequency transformation
Device depressor forms, and E is input direct-current voltage, and T1~T4 is switching tube, and D1~D4 is internal diode, and C1~C4 is the defeated of switch
Go out capacitance, introduced by taking first bridge arm as an example, using transformer leakage inductance and power output capacitance C1 resonance, leakage inductance energy storage is to capacitance
During C1 releases, the voltage on capacitance is set gradually to drop to zero, internal diode D1 is open-minded, creates the ZVS conditions of T1.
Preferably, the core of the control circuit is phase-modulator, 13 foot B output signals and 14 foot A output signals
Reverse phase, 9 foot C output signals and 8 foot D output signal reverse phases, this four drive signals are gone to drive after expanding and flowing by driving transformer
The characteristics of~metal-oxide-semiconductor, phase controlling be embodied in UC3875 four output end driving pulses having the same respectively drive A/B,
Two half-bridges of C/D have source time by phase shift dislocation control, keep four switch wheel conductances of full-bridge logical, each output stage conducting
Preceding all there are one dead zones, and can adjust dead time, and the defeated of next device for power switching is ensured in the dead time
Go out capacitance discharge off, the switching device for that will be connected provides voltage and opens condition.
Preferably, it the resonant switch action time of each pair of output stage (A/B, C/D) of the control circuit, can individually control
System, under full-bridge transformation topology pattern, the advantages of phase shifting control, obtains most adequately embodying, and UC3875 is in voltage mode and electric current
It can work under pattern, and with overcurrent shutdown to realize the quick protection of failure.
Preferably, the induction alarm for high voltage circuit is when A is far from high pressure object, the resistance between one source electrode of leakage of BG1
Smaller, respective transistor BG2 is in cut-off state because base potential is relatively low, and IC is because power circuit access failure is without working, phase
Answer piezoelectric ceramic piece HTD in warning circuit not sounding, when A is close to high pressure object, the upper induction field signals of A, BG1 at this time
The resistance leaked between a source electrode becomes larger, and BG2 pipes are connected because base potential improves, and corresponding IC sends out sound because powering on circuit
Happy alarm signal, the signal push HTD to send out alarm after BG3 amplifies.
(3) advantageous effect
The ZigBee communication module effect of the present invention is the effect of LAN, for connecting the control terminal in LAN,
It is used for transmission signal, control primary circuit is gone by secondary circuit, that is, controls the switch of substation, overvoltage crowbar setting exists
On output circuit, for preventing output voltage excessive, the damage of substation's delivery port electrical appliance, high frequency switch power electricity are caused
Road is used to control the total power switch of substation, and hf switching power supply includes phase shifting control full-bridge circuit and control electricity
Road, induction alarm for high voltage circuit are used to detect the situation when mistake high pressure in substation, detect high pressure leaky and pass through report
Alert mode notifies staff to close total power switch in time, and the configuration of the present invention is simple, security performance higher, control is more just
Victory has very strong creativeness.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the transforming plant primary circuit diagram of the present invention；
Fig. 2 is the overvoltage crowbar schematic diagram of the present invention；
Fig. 3 is the ZigBee communication module circuit schematic of the present invention；
Fig. 4 is the phase shifting control full-bridge circuit schematic diagram of hf switching power supply；
Fig. 5 is the control circuit schematic diagram of hf switching power supply；
Fig. 6 is the induction alarm for high voltage circuit diagram of the present invention.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
A kind of long-range transformer substation system based on photovoltaic generation, including photovoltaic circuit, inverter circuit and transforming plant primary electricity
Road, inverter circuit are used to photovoltaic generation being converted to alternating current, and photovoltaic circuit is used to connecting and supplying electricity to transforming plant primary circuit,
Including overvoltage crowbar, ZigBee communication modular circuit, hf switching power supply and induction alarm for high voltage circuit, ZigBee
Communication module effect is that the effect of LAN is used for transmission signal, passes through secondary returning for connecting the control terminal in LAN
Control primary circuit is gone on road, that is, controls the switch of substation, and overvoltage crowbar is arranged on output circuit, is exported for preventing
Voltage is excessive, and the damage of substation's delivery port electrical appliance, hf switching power supply is caused to be used to control total electricity of substation
Source switch, hf switching power supply include phase shifting control full-bridge circuit and control circuit, and induction alarm for high voltage circuit is used
In detect substation in mistakes high pressure when situation, detection high pressure leaky and notified by way of alarm staff and
When close total power switch.
ZigBee communication modular circuit main controlled node as shown in Figure 3 uses MSP430 super low power consuming single chip processors, MCU's
P3.4, P3.5 pin are set as asynchronous serial transceiver interface, and asynchronous serial communication, microcontroller are carried out with the ZigBee module of node
Collected data are sent to ZigBee module, and the wireless data that ZigBee module receives also can pellucidly be sent to
MCU。
31,32,33, the 34 pins SPI communication interface corresponding with microcontroller of the CC2420 of ZigBee communication modular circuit
Being connected, i.e. CSn, SCLK of CC2420, SI, SO, pin are connected with SET0, SMCLK, SIMO0, SOMI0 pin of MSP430, this
Sample, CC2420 transmitting chips can carry out the communication of full duplex with MCU, and 27 pins (SFD notes start delimiter) are with MCU's
TimeCapture pins are connected, and 28 pins (CCA idle-channel evaluations) are connected with the one of pins of MCU, and MCU can lead to
The reading to the pin state is crossed, idle channel is judged whether there is.
After 220V substations are exported electricity decompression current limliting by overvoltage crowbar capacitor C1 as shown in Figure 2, by diode
VD1, VD2 rectification, capacitor C2 serve as filtering, obtain the DC voltage of 12V or so, when network voltage is normal, two pole of voltage stabilizing
Pipe VDW breakdown cannot be connected, and triode VT is in cut-off state at this time, and bidirectional triode thyristor VS is connected by voltage triggered face.
If network voltage increases suddenly, more than 250V, the voltage at the midpoints RP results in VDW breakdown conductings, VDW at this time
After conducting, and make triode VT conductings, after VT conductings, the pressure drop very little of Collector Emitter is not enough to triggering VS, again
Cause VS to end, therefore the household electrical appliances power-off in socket XS is stopped, thus plays the purpose of protection, once under network voltage
Drop, VT end again, and the collector potential of VT increases, and trigger VS conductings.
Phase shifting control full-bridge circuit as shown in Figure 4, mainly by four identical power tubes and a high frequency transformation
Device depressor forms, and E is input direct-current voltage, and T1~T4 is switching tube, and D1~D4 is internal diode, and C1~C4 is the defeated of switch
Go out capacitance, introduced by taking first bridge arm as an example, using transformer leakage inductance and power output capacitance C1 resonance, leakage inductance energy storage is to capacitance
During C1 releases, the voltage on capacitance is set gradually to drop to zero, internal diode D1 is open-minded, creates the ZVS conditions of T1.
The core of control circuit as shown in Figure 5 is phase-modulator, 13 foot B output signals and 14 foot A output signals
Reverse phase, 9 foot C output signals and 8 foot D output signal reverse phases, this four drive signals are gone to drive after expanding and flowing by driving transformer
The characteristics of~metal-oxide-semiconductor, phase controlling be embodied in UC3875 four output end driving pulses having the same respectively drive A/B,
Two half-bridges of C/D have source time by phase shift dislocation control, keep four switch wheel conductances of full-bridge logical, each output stage conducting
Preceding all there are one dead zones, and can adjust dead time, and the defeated of next device for power switching is ensured in the dead time
Go out capacitance discharge off, the switching device for that will be connected provides voltage and opens condition.
It the resonant switch action time of each pair of output stage (A/B, C/D) of control circuit, can individually control, become in full-bridge
It changes under topological mode, the advantages of phase shifting control obtains most adequately embodying, and UC3875 is under voltage mode and current-mode
Work, and with overcurrent shutdown to realize the quick protection of failure.
Induction alarm for high voltage circuit as shown in FIG. 6 is when A is far from high pressure object, the resistance between one source electrode of leakage of BG1
Smaller, respective transistor BG2 is in cut-off state because base potential is relatively low, and IC is because power circuit access failure is without working, phase
Answer piezoelectric ceramic piece HTD in warning circuit not sounding, when A is close to high pressure object, the upper induction field signals of A, BG1 at this time
The resistance leaked between a source electrode becomes larger, and BG2 pipes are connected because base potential improves, and corresponding IC sends out sound because powering on circuit
Happy alarm signal, the signal push HTD to send out alarm after BG3 amplifies.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also include other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to aforementioned each implementation
Technical solution recorded in example is modified or equivalent replacement of some of the technical features；And these modification or
It replaces, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (9)
1. a kind of long-range transformer substation system based on photovoltaic generation, including photovoltaic circuit, inverter circuit and transforming plant primary circuit,
The inverter circuit is used to photovoltaic generation being converted to alternating current, and the photovoltaic circuit is for connecting and supplying electricity to the substation
Primary circuit, it is characterised in that：Including overvoltage crowbar, ZigBee communication modular circuit, hf switching power supply and sense
Alarm for high voltage circuit is answered, the ZigBee communication module effect is the effect of LAN, for connecting the end of the control in LAN
End, is used for transmission signal, and control primary circuit is gone to by secondary circuit, that is, controls the switch of substation, the overvoltage protection electricity
Road is arranged on output circuit, for preventing output voltage excessive, causes the damage of substation's delivery port electrical appliance, the height
Frequency switching power circuit is used to control the total power switch of substation, and the hf switching power supply includes phase shifting control full-bridge
Translation circuit and control circuit, the induction alarm for high voltage circuit are used to detect the situation when mistake high pressure in substation, detection
High pressure leaky simultaneously notifies staff to close total power switch in time by way of alarm.
2. the long-range transformer substation system according to claim 1 based on photovoltaic generation, it is characterised in that：The ZigBee is logical
Believe that modular circuit main controlled node uses MSP430 super low power consuming single chip processors, P3.4, P3.5 pin of MCU to be set as asynchronous serial receipts
Interface is sent out, carries out asynchronous serial communication with the ZigBee module of node, collected data are sent to ZigBee moulds by microcontroller
Block, and the wireless data that ZigBee module receives also can pellucidly send MCU to.
3. the long-range transformer substation system according to claim 2 based on photovoltaic generation, it is characterised in that：The ZigBee is logical
Believe that 31,32,33, the 34 pins SPI communication interface corresponding with microcontroller of the CC2420 of modular circuit is connected, i.e. CC2420's
CSn, SCLK, SI, SO, pin are connected with SET0, SMCLK, SIMO0, SOMI0 pin of MSP430, in this way, CC2420 emits core
Piece can carry out the communication of full duplex, the TimeCapture pin phases of 27 pins (SFD notes start delimiter) and MCU with MCU
Even, 28 pins (CCA idle-channel evaluations) are connected with the one of pins of MCU, and MCU can pass through the reading to the pin state
It takes, judges whether there is idle channel.
4. the long-range transformer substation system according to claim 1 based on photovoltaic generation, it is characterised in that：The overvoltage protection
After 220V substations are exported electricity decompression current limliting by circuit capacitor C1, by diode VD1, VD2 rectification, capacitor C2 serves as filter
Wave obtains the DC voltage of 12V or so, and when network voltage is normal, zener diode VDW breakdown cannot be connected, and at this time three
Pole pipe VT is in cut-off state, and bidirectional triode thyristor VS is connected by voltage triggered face.
5. the long-range transformer substation system according to claim 4 based on photovoltaic generation, it is characterised in that：If network voltage
It increases suddenly, more than 250V, the voltage at the midpoints RP results in VDW breakdown conductings at this time, after VDW conductings, and makes triode
VT is connected, and after VT conductings, the pressure drop very little of Collector Emitter is not enough to triggering VS, and VS is caused to end, therefore socket
Household electrical appliances power-off in XS is stopped, thus plays the purpose of protection, once network voltage declines, VT ends again, the collection of VT
Electrode potential increases, and triggers VS conductings.
6. the long-range transformer substation system according to claim 1 based on photovoltaic generation, it is characterised in that：The phase shifting control
Full-bridge circuit is mainly made of four identical power tubes and a high frequency transformer depressor, and E is input direct-current voltage,
T1~T4 is switching tube, and D1~D4 is internal diode, and C1~C4 is the output capacitance of switch, is situated between by taking first bridge arm as an example
It continues, makes the electricity on capacitance during leakage inductance energy storage is discharged to capacitance C1 using transformer leakage inductance and power output capacitance C1 resonance
Pressure gradually drops to zero, and internal diode D1 is open-minded, creates the ZVS conditions of T1.
7. the long-range transformer substation system according to claim 1 based on photovoltaic generation, it is characterised in that：The control circuit
Core be phase-modulator, 13 foot B output signals and 14 foot A output signal reverse phases, 9 foot C output signals are exported with 8 foot D
The characteristics of signal inversion, this four drive signals remove driving~metal-oxide-semiconductor after expanding and flowing by driving transformer, phase controlling is embodied in
Four output end driving pulses having the same of UC3875 respectively drive two half-bridges of A/B, C/D, are misplaced and are controlled by phase shift
There is source time, keep four switch wheel conductances of full-bridge logical, there are one dead zones before each output stage conducting, and can adjust dead
Area's time ensures the output capacitance discharge off of next device for power switching in the dead time, is opened for what will be connected
Device offer voltage is provided and opens condition.
8. the long-range transformer substation system according to claim 7 based on photovoltaic generation, it is characterised in that：The control circuit
Each pair of output stage (A/B, C/D) resonant switch action time, can individually control, under full-bridge transformation topology pattern, move
Facies-controlled advantage obtains most adequately embodying, and UC3875 can work under voltage mode and current-mode, and have electricity
Stream shutdown is to realize the quick protection of failure.
9. the long-range transformer substation system according to claim 1 based on photovoltaic generation, it is characterised in that：The induction high pressure
For warning circuit when A is far from high pressure object, the resistance between one source electrode of leakage of BG1 is smaller, and respective transistor BG2 is because of base potential
Relatively low and be in cut-off state, IC is because power circuit access failure is without working, and the piezoelectric ceramic piece HTD in corresponding warning circuit is not
Sounding, when A is close to high pressure object, the upper induction field signals of A, at this time the resistance between one source electrode of leakage of BG1 become larger, BG2 pipe
It is connected because base potential improves, corresponding IC sends out music alarm signal because powering on circuit, and the signal is after BG3 amplifies
HTD is pushed to send out alarm.
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Application publication date: 20181009 |