CN114977469A - Direct current remote power supply system with multiple standby functions and suitable for high-speed electromechanical equipment - Google Patents

Direct current remote power supply system with multiple standby functions and suitable for high-speed electromechanical equipment Download PDF

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Publication number
CN114977469A
CN114977469A CN202210607161.1A CN202210607161A CN114977469A CN 114977469 A CN114977469 A CN 114977469A CN 202210607161 A CN202210607161 A CN 202210607161A CN 114977469 A CN114977469 A CN 114977469A
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CN
China
Prior art keywords
remote
power supply
mos transistor
switch
inductor
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Pending
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CN202210607161.1A
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Chinese (zh)
Inventor
吴忠
刘翔
徐大海
黄白羽
周俊
胡祥
毛文静
梁子东
杨上滢
刘令君
金文辉
符君
吴澜
洪秉旺
周哲
皮旭东
刘文斌
吴子睿
薛伟根
丁力
王星
刘世伟
季坡
李佑南
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Beijing Zhongrui Fangxing Technology Co ltd
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Beijing Zhongrui Fangxing Technology Co ltd
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Priority to CN202210607161.1A priority Critical patent/CN114977469A/en
Publication of CN114977469A publication Critical patent/CN114977469A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
    • H02H3/046—Signalling the blowing of a fuse
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
    • H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention provides a direct current remote power supply system with multiple standby functions, which is suitable for high-speed electromechanical equipment and comprises at least one remote machine, wherein the remote machine comprises: a front-end circuit unit: the remote terminal is used for assisting in controlling the working mode of the remote terminal and stabilizing the direct-current voltage transmitted by the local terminal; a controller: the remote end circuit unit is used for being connected with the front end circuit unit and controlling the working mode of the remote end machine; off-grid inversion unit: the inverter is used for inverting the direct-current voltage stabilized by the front-end circuit unit into a stable alternating current to supply power to the load. The invention has high reliability, is provided with a photovoltaic cell panel, a storage battery and a near local end machine for standby, can provide uninterrupted power supply for a load when the local end machine fails or the power supply of the local end machine is cut off, and improves the reliability of power supply; the remote machine can automatically control the working mode, realizes the automatic control of local machine power supply, photovoltaic power supply and storage battery charging and discharging, and has high automation degree.

Description

Direct current remote power supply system with multiple standby functions and suitable for high-speed electromechanical equipment
Technical Field
The invention relates to the technical field of direct current power supply, in particular to a direct current remote power supply system with multiple standby functions, which is suitable for high-speed electromechanical equipment.
Background
Various electromechanical devices such as a camera, a variable information board, a vehicle inspection device, a meteorological sensor, a radar and the like are arranged on the highway, and the problems of long transmission distance, difficulty in local power taking and the like exist in a power supply line for each electromechanical device arranged on the highway.
There are several ways of supplying ac power to electromechanical devices on a highway today.
AC power supply: get the alternating current through the electric substation along the highway along the line, boost, through laying power cable to the far-end transmission, provide the alternating current for electromechanical device after the consumer end step-down, but long distance alternating current power supply needs many times step-down conversion, the loss of electricity is big, poor stability, and the guarantee rank is low, receives the power failure puzzlement, and hardly realizes high-power electromechanical device and low-power electromechanical device's hybrid power supply.
Wind-solar complementary power supply: the photovoltaic panel is used for converting solar energy into direct current, or the wind power generator is used for converting wind energy into direct current, and then the inverter is used for converting the direct current into alternating current to provide electric energy for the electromechanical equipment.
D, direct-current remote power supply: the method has the advantages of long transmission distance, low loss, simple system, high reliability and the like, and is more and more applied to the field of power supply of the electromechanical equipment on the highway in recent years.
The invention with application number 201610045529.4 discloses a power supply system and method applied to a highway direct current remote power supply alternating current local side machine, comprising the following steps: dividing a power supply area required by the highway into a plurality of power supply units according to a set distance; at least one alternating current local terminal is arranged in each power supply unit, the alternating current local terminal comprises a voltage conversion module with an alternating current input end and a direct current output end, and the alternating current input end is connected with an alternating current power frequency or medium frequency voltage source; the direct current output end outputs at least one direct current voltage; the remote terminals arranged at each load position needing power supply in the power supply unit are sequentially connected by taking the AC local terminal as a starting point through a power transmission cable; and the remote machine converts the received direct-current voltage into voltage required by the load to supply power to the load. The operation and maintenance cost of the invention is lower than that of other power supply modes, and maintenance is not needed as long as the power supply is not damaged in principle. However, if the power supply fails, all the electromechanical devices in the power supply unit cannot operate, and the reliability is not high.
Utility model with application number 201620065566.7 discloses a direct current far supply source exchanges local terminal and adopts power supply system of exchanging local terminal, include: the voltage conversion module is provided with an alternating current input end and a direct current output end, and the alternating current input end is connected with an alternating current power frequency or intermediate frequency voltage source of any power supply point; the direct current output end outputs at least one direct current voltage; the voltage conversion module at least comprises a filtering unit, an AC/DC rectifying unit and at least one power module which is composed of a PWM (pulse width modulation) unit and a DC/DC isolation conversion unit, wherein the filtering unit, the AC/DC rectifying unit and the at least one power module are sequentially connected. The utility model discloses a can install in any place that has the alternating current and embrace the pole installation and can use work indoor or on the pole, get the electricity and have arbitrariness and randomness, do not receive strict limitation, thereby realize that a local terminal machine drags many distal end machines and supplies power for a plurality of loads. But it can only fix the DC voltage of the output DC400V or DC800V and it does not support the AC voltage input of AC 380V.
The utility model discloses a utility model is 202122119540.X discloses a highway direct current remote power supply system for each load equipment supplies power in for the highway, direct current remote power supply system includes local terminal equipment and at least one distal end system, and each distal end system is laid along the highway in proper order, and each distal end system corresponds respectively and connects at least one load equipment, all includes the remote terminal machine in each distal end system respectively, including being used for providing the power converter of voltage conversion in the remote terminal machine, each distal end system still including being used for dynamic dilatation, stably supplying power distributed photovoltaic equipment, distal end energy storage equipment supplies power for each load equipment. The utility model discloses a when having solved among the prior art electric wire netting trouble or local side machine equipment trouble, unable output stable direct current, the problem of load with unable work carries out the dilatation to power supply system simultaneously, effectively promotes the conveying capacity of electric wire netting, deals with the electric wire netting trouble problem, guarantees supply voltage's stability. However, in the system disclosed in the new model, the DC/DC needs to be separately set outside the remote machine to connect the photovoltaic device and the storage battery, and the automatic control of the connection and disconnection of the photovoltaic device and the storage battery and the charging and discharging of the storage battery cannot be realized.
Disclosure of Invention
In order to solve at least one of the above technical problems, the present invention provides a dc remote power supply system with multiple backup functions, which is suitable for high-speed electromechanical devices.
A dc remote power supply system with multiple back-ups for high-speed electromechanical devices, comprising at least one remote machine, said remote machine comprising:
a front-end circuit unit: the remote terminal is used for assisting in controlling the working mode of the remote terminal and stabilizing the direct-current voltage transmitted by the local terminal;
a controller: the remote terminal is used for being connected with the front-end circuit unit and controlling the working mode of the remote terminal;
off-grid inversion unit: the inverter is used for inverting the direct-current voltage stabilized by the front-end circuit unit into a stable alternating current to supply power to the load.
Preferably, the front-end circuit unit includes a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3 and a fourth MOS transistor Q4; the drain of the first MOS transistor Q1 is connected to the positive pole of the direct current input, the source thereof is connected with the drain of the second MOS transistor Q2, and the source of the second MOS transistor Q2 is connected to the negative pole of the direct current input; the drain of the third MOS transistor Q3 is connected to the positive pole of the dc input, the source thereof is connected to the drain of the fourth MOS transistor Q4, and the source of the fourth MOS transistor Q4 is connected to the negative pole of the dc input.
Preferably, in any of the above solutions, the gate of the first MOS transistor Q1, the gate of the second MOS transistor Q2, the gate of the third MOS transistor Q3, and the gate of the fourth MOS transistor Q4 are all connected to the controller, and receive the corresponding driving waveforms output by the controller according to the operation mode.
Any of the above schemes preferably further includes a first inductor L1, a second inductor L2, a third inductor L3, and a first switch K1, a second switch K2, and a third switch K3; the first inductor L1 and the first switch L1 are connected in series and then are arranged between the source of the first MOS transistor Q1 and the anode of the battery; the second inductor L2 and the second switch K2 are connected in series and then disposed between the source of the first MOS transistor Q1 and the source of the third MOS transistor Q3; the third inductor L3 and the third switch K3 are connected in series and then disposed between the source of the third MOS transistor Q3 and the anode of the photovoltaic cell panel.
Preferably, in any of the above embodiments, a negative electrode of the storage battery is connected to a negative electrode of the dc input, and a negative electrode of the photovoltaic cell panel is connected to a negative electrode of the dc input.
In any of the above embodiments, the front-end circuit unit further includes a fifth switch K5, and the fifth switch K5 is disposed on the dc input positive line between the drain of the first MOS transistor Q1 and the drain of the third MOS transistor Q3.
In the above-mentioned one aspect, the front-end circuit unit is preferably connected to a dc bus of the output of the central office via a fourth switch K4.
The preferred of any above-mentioned scheme is that, off-grid inverter unit includes single-phase contravariant full bridge circuit and LCL filter, the output of front end circuit unit with the back is connected to single-phase contravariant full bridge circuit's input, provides single-phase 220V alternating current for the load through the LCL filtering.
The preferred of any above-mentioned scheme is that off-grid inverter unit includes three-phase contravariant full bridge circuit and LCL filter, the output of front end circuit unit with the back is connected to three-phase contravariant full bridge circuit's input, provides three-phase 380V alternating current for the load through the LCL filtering.
Preferably, in any of the above aspects, the controller controlling the operation mode of the remote machine includes:
step 1: detecting whether the value of the remote supply direct current input voltage is within a set threshold range, if so, executing a step 2; if not, executing the step 5;
step 2: controlling a second switch K2 to be closed, detecting whether the storage battery is in a state of needing charging, if not, executing a step 3, and if so, executing a step 4;
and step 3: the first MOS tube Q1, the second MOS tube Q2, the third MOS tube Q3, the fourth MOS tube Q4 and the second inductor L2 form a BUCK/BOOST circuit, and the remote supply direct current input voltage is stabilized to be a fixed voltage value and then is input into the off-grid inverter unit;
and 4, step 4: the first switch K1 is controlled to be closed, and the first MOS tube Q1, the second MOS tube Q2 and the first inductor L1 form a BUCK circuit to charge the storage battery; the third MOS tube Q3, the fourth MOS tube Q4 and the second inductor L2 form a BOOST circuit, and the remote supply direct current input voltage is stabilized to be a fixed voltage value and then is input into the off-grid inverter unit;
and 5: detecting whether the photovoltaic cell panel can normally output, if so, executing a step 6, and if not, executing a step 9;
step 6: controlling the third switch K3 to be closed, detecting whether the storage battery is in a state of needing to be charged, if not, executing a step 7, and if so, executing a step 8;
and 7: the third MOS tube Q3, the fourth MOS tube Q4 and the second inductor L2 form a BOOST circuit, and the output voltage of the photovoltaic cell panel is stabilized to be a fixed voltage value and then is input into the off-grid inversion unit;
and 8: the first switch K1 and the fifth switch K5 are controlled to be closed, the third MOS tube Q3, the fourth MOS tube Q4 and the second inductor L2 form a BOOST circuit, and the output voltage of the photovoltaic cell panel is stabilized to be a fixed voltage value and then is input into the off-grid inverter unit; the first MOS tube Q1, the second MOS tube Q2 and the first inductor L1 form a BUCK circuit to charge the storage battery;
and step 9: detecting whether the storage battery can provide electric energy, if so, executing the step 10, and if not, giving a power supply fault alarm;
step 10: and the first switch K1 and the second switch K2 are controlled to be closed, the third MOS tube Q3, the fourth MOS tube Q4, the first inductor L1 and the second inductor L2 form a BOOST circuit, and the output voltage of the storage battery is stabilized to a fixed voltage value and then is input into the off-grid inversion unit.
In any of the above embodiments, the set threshold value is preferably in a range from DC300V to DC 1000V.
Preferably, in any of the above solutions, the fixed voltage value is DC 350V.
In any of the above embodiments, preferably, during the operation mode of the remote unit controlled by the controller, the fourth switch K4 is in a closed state except for being in an open state due to a fault.
Preferably, in any of the above schemes, the DC remote power supply system further includes at least one local terminal, the local terminal is provided with an AC input terminal and a DC output terminal, the AC input terminal inputs AC220V or AC380V, the DC output terminal outputs DC300V to DC1000V, and the DC output terminal is connected to at least one remote terminal through a cable to provide a remote DC input voltage for the remote terminal.
Preferably, in any of the above schemes, the two local-end machines respectively located in the two adjacent power-taking places are set as mutual standby.
The direct current remote power supply system with multiple standby functions, which is suitable for high-speed electromechanical equipment, has the following beneficial effects:
1. the system has high reliability, is provided with a photovoltaic cell panel, a storage battery and a near local end machine for standby, can provide uninterrupted power supply for a load when the local end machine fails or the power supply of the local end machine is cut off, and improves the power supply reliability;
2. the original photovoltaic cell panel and the storage battery can be used as standby, and an independent DC/DC converter is not required to be arranged for the photovoltaic cell panel and the storage battery for boosting;
3. the remote machine can automatically control the working mode, realizes the automatic control of local machine power supply, photovoltaic power supply and storage battery charging and discharging, and has high automation degree.
Drawings
Fig. 1 is a partial schematic structural diagram of a preferred embodiment of a dc remote power supply system with multiple standby functions suitable for high-speed electromechanical devices according to the present invention.
Fig. 2 is a schematic diagram of a front-end circuit unit of a preferred embodiment of a remote machine with multiple standby dc remote power supply systems for high-speed electromechanical devices according to the present invention.
Fig. 3 is a schematic structural diagram of the off-grid inverter unit of the embodiment shown in fig. 2 of the remote machine with multiple standby dc remote power supply systems suitable for high-speed electromechanical devices according to the present invention.
Fig. 4 is a schematic diagram of the controller operation flow of the remote machine with multiple standby dc remote power supply systems for high-speed electromechanical devices according to the embodiment of the present invention shown in fig. 2.
Fig. 5 is a schematic structural diagram of an off-grid inverter unit according to another embodiment of a remote machine with multiple standby dc remote power supply systems for high-speed electromechanical devices.
Fig. 6 is a schematic external view of the remote unit with multiple standby dc remote power supply systems for high-speed electromechanical devices according to the embodiment of the present invention shown in fig. 5.
Fig. 7 is a schematic structural diagram of a central office terminal with multiple standby dc remote power supply systems suitable for high-speed electromechanical devices according to a preferred embodiment of the present invention.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the following examples.
Example 1
A direct current remote power supply system with multiple standby functions suitable for high-speed electromechanical equipment comprises at least one local terminal and at least one remote terminal, wherein the local terminal is provided with an alternating current input end and a direct current output end, the alternating current input end inputs alternating current of AC220V or AC380V, the direct current output end outputs direct current of DC 300V-DC 1000V, and the direct current output end is connected with at least one remote terminal through a cable.
Fig. 1 is a schematic view of a local structure of a dc remote power supply system having multiple standby functions and suitable for a high-speed electromechanical device, in the dc remote power supply system, local terminals JDJ11 and JDJ12 are provided in a first power-taking place, local terminals JDJ21 and JDJ22 are provided in a second power-taking place, local terminals JDJ31 and JDJ32 are provided in a third power-taking place, a dc bus is led out from each local terminal, a plurality of cable T-junction boxes are provided on the dc bus led out from the local terminals, a cable is led out from each cable T-junction box and connected to one remote terminal, and each remote terminal supplies power to at least one load, that is, the high-speed electromechanical device.
It should be noted that two local-side machines respectively located in two adjacent power-taking places are set as standby for each other. The direct current buses led out by the two local-end machines which are mutually standby are the same direct current bus. Specifically, the office JDJ12 and the office JDJ21 are backup to each other, the office JDJ22 and the office JDJ31 are backup to each other, the office JDJ11 is backup to a certain office in an adjacent substation in front thereof, and the office JDJ32 is backup to a certain office in an adjacent substation behind thereof. For a detailed illustration with the office terminal JDJ12 and the office terminal JDJ21 as standby, assuming that N loads are connected to a dc bus between the office terminal JDJ12 and the office terminal JDJ21, (1) the office terminal JDJ12 may be set to supply power to the N loads, and when the office terminal JDJ12 fails or is powered off, the standby office terminal JDJ21 is put into use to start supplying power to the N loads; (2) the office terminal JDJ12 may be configured to supply power to M loads on the dc bus between the office terminal JDJ12 and the office terminal JDJ21, the office terminal JDJ21 supplies power to the remaining N-M loads, when the office terminal JDJ12 fails or is powered off, the office terminal JDJ21 automatically starts to supply power to all N loads, and when the office terminal JDJ21 fails or is powered off, the office terminal JDJ12 performs the same operation.
The remote machine includes:
a front-end circuit unit: the remote terminal is used for assisting in controlling the working mode of the remote terminal and stabilizing the direct-current voltage transmitted by the local terminal;
a controller: the remote terminal is used for being connected with the front-end circuit unit and controlling the working mode of the remote terminal;
off-grid inversion unit: the inverter is used for inverting the direct-current voltage stabilized by the front-end circuit unit into alternating current to supply power to the load.
As shown in fig. 2, the front-end circuit unit includes a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3 and a fourth MOS transistor Q4; the drain of the first MOS transistor Q1 is connected to the positive pole of the direct current input, the source thereof is connected with the drain of the second MOS transistor Q2, and the source of the second MOS transistor Q2 is connected to the negative pole of the direct current input; the drain of the third MOS transistor Q3 is connected to the positive pole of the dc input, the source thereof is connected to the drain of the fourth MOS transistor Q4, and the source of the fourth MOS transistor Q4 is connected to the negative pole of the dc input. The front-end circuit unit further comprises a first inductor L1, a second inductor L2, and a third inductor L3, and a first switch K1, a second switch K2, and a third switch K3; the first inductor L1 and the first switch L1 are connected in series and then are arranged between the source of the first MOS transistor Q1 and the anode of the battery; the second inductor L2 and the second switch K2 are connected in series and then disposed between the source of the first MOS transistor Q1 and the source of the third MOS transistor Q3; the third inductor L3 and the third switch K3 are connected in series and then disposed between the source of the third MOS transistor Q3 and the anode of the photovoltaic cell panel. The front-end circuit unit further comprises a fifth switch K5, wherein the K5 is arranged on a direct current input positive electrode line between the drain electrode of the first MOS transistor Q1 and the drain electrode of the third MOS transistor Q3. The front-end circuit unit is connected to a direct current bus of the output of the local terminal machine through a fourth switch K4. The negative pole of the storage battery is connected with the negative pole of the direct current input, and the negative pole of the photovoltaic cell panel is connected with the negative pole of the direct current input.
The gate of the first MOS transistor Q1, the gate of the second MOS transistor Q2, the gate of the third MOS transistor Q3, and the gate of the fourth MOS transistor Q4 are all connected to the controller, and receive the corresponding driving waveforms output by the controller according to the operation mode.
As shown in fig. 3, the off-grid inverter unit includes a single-phase inverter full-bridge circuit and an LCL filter, and the output end of the front-end circuit unit is connected to the input end of the single-phase inverter full-bridge circuit, and provides a single-phase 220V ac power for the load through the LCL filter.
As shown in fig. 4, the controller controlling the operation mode of the remote machine includes:
step 1: detecting whether the value of the remote supply direct current input voltage is within a set threshold range, and if so, executing a step 2; if not, executing the step 5;
step 2: controlling a second switch K2 to be closed, detecting whether the storage battery is in a state of needing charging, if not, executing a step 3, and if so, executing a step 4;
and step 3: the first MOS tube Q1, the second MOS tube Q2, the third MOS tube Q3, the fourth MOS tube Q4 and the second inductor L2 form a BUCK/BOOST circuit, and the remote supply direct current input voltage is stabilized to be a fixed voltage value and then is input into the off-grid inverter unit;
and 4, step 4: the first switch K1 is controlled to be closed, and the first MOS tube Q1, the second MOS tube Q2 and the first inductor L1 form a BUCK circuit to charge the storage battery; the third MOS tube Q3, the fourth MOS tube Q4 and the second inductor L2 form a BOOST circuit, and the remote supply direct current input voltage is stabilized to be a fixed voltage value and then is input into the off-grid inverter unit;
and 5: detecting whether the photovoltaic cell panel can normally output, if so, executing a step 6, and if not, executing a step 9;
step 6: controlling the third switch K3 to be closed, detecting whether the storage battery is in a state of needing to be charged, if not, executing the step 7, and if so, executing the step 8;
and 7: the third MOS tube Q3, the fourth MOS tube Q4 and the second inductor L2 form a BOOST circuit, and the output voltage of the photovoltaic cell panel is stabilized to be a fixed voltage value and then is input into the off-grid inversion unit;
and 8: the first switch K1 and the fifth switch K5 are controlled to be closed, the third MOS tube Q3, the fourth MOS tube Q4 and the second inductor L2 form a BOOST circuit, and the output voltage of the photovoltaic cell panel is stabilized to be a fixed voltage value and then is input into the off-grid inverter unit; the first MOS tube Q1, the second MOS tube Q2 and the first inductor L1 form a BUCK circuit to charge the storage battery;
and step 9: detecting whether the storage battery can provide electric energy, if so, executing the step 10, and if not, giving a power supply fault alarm;
step 10: and the first switch K1 and the second switch K2 are controlled to be closed, the third MOS tube Q3, the fourth MOS tube Q4, the first inductor L1 and the second inductor L2 form a BOOST circuit, and the output voltage of the storage battery is stabilized to be a fixed voltage value and then is input into the off-grid inverter unit.
In this embodiment, it is preferable that the set threshold range is DC 300V-DC 1000V, and the fixed voltage value is DC 350V. During the operation mode of the remote control unit, the fourth switch K4 is closed except for being in an open state due to a fault.
It should be noted that, only when both the main and standby local side machines connected to the remote side machine fail, the photovoltaic cell panel and the storage battery may be put into use to supply power to the load.
Example 2
Unlike embodiment 1, as shown in fig. 5, the off-grid inverter unit of the remote terminal includes a three-phase inverter full bridge circuit and an LCL filter, an output terminal of the LCL filter is connected to an input terminal of a TC transformer through an ac main contactor KM1, an output terminal of the TC transformer is connected to an input terminal of an ac EMC filter, and an output terminal of the ac EMC filter is connected to a load through an ac breaker QF1, so as to provide a three-phase 380V ac power to the load.
In this embodiment, it is preferable that the input end and the output end of the remote terminal are further provided with a lightning protection unit, and the output end of the remote terminal is further provided with an overvoltage protection unit, so that when the output voltage exceeds 10% of the set value, the power supply can be quickly cut off, and an alarm can be given.
As shown in fig. 6, the lightning protection unit, the overvoltage protection unit, the off-grid inverter unit, the front-end circuit unit, the ac main contactor KM1, the TC transformer, the ac EMC filter, the ac circuit breaker QF1 and other electrical components of the remote terminal are all disposed in a housing 10, the upper surface of the housing 10 is provided with a display module 30, the upper surface of the housing 10 is further provided with a heat sink 20, the lower side of the housing 10 is provided with a protruding edge 40, the edge 40 is provided with a plurality of terminals 50, and the remote terminal is connected with a storage battery, a photovoltaic cell panel, a dc bus, a load and the like.
Example 3
As shown in fig. 7, the central office terminal includes two power portions of AC/DC rectification and DC/DC conversion, and an input/output protection and auxiliary power supply, wherein the AC/DC rectification portion includes a front-stage bridge rectification and smoothing filter for rectifying the input AC power into a smooth DC power; the DC/DC conversion part comprises a DC/DC converter, a control circuit thereof and a rectification filter part, and is used for converting the direct current output by the AC/DC rectification part into a stable voltage value between 300V and 1000V required by a power supply system and then outputting the voltage value. The DC/DC control circuit comprises a microprocessor, an over-temperature protection circuit, a resonant voltage type double-loop control loop, an overvoltage, overcurrent and short-circuit protection circuit, a current sharing control circuit and a feedback sampling circuit. The local terminal machine also comprises an RS-485 communication interface, a nixie tube display key and a dial switch.
It should be noted that the above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the foregoing embodiments illustrate the invention in detail, those skilled in the art will appreciate that: it is possible to modify the technical solutions described in the foregoing embodiments or to substitute some or all of the technical features thereof, without departing from the scope of the technical solutions of the present invention.

Claims (10)

1. The direct current far-reaching power supply system who possesses multiple reserve suitable for high-speed electromechanical device includes at least one remote machine, its characterized in that: the remote machine includes:
a front-end circuit unit: the remote terminal is used for assisting in controlling the working mode of the remote terminal and stabilizing the direct-current voltage transmitted by the local terminal;
a controller: the remote terminal is used for being connected with the front-end circuit unit and controlling the working mode of the remote terminal;
off-grid inversion unit: the inverter is used for inverting the direct-current voltage stabilized by the front-end circuit unit into a stable alternating current to supply power to the load.
2. The dc remote power supply system with multiple backup functions for high-speed electromechanical devices as claimed in claim 1, wherein: the front-end circuit unit comprises a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3 and a fourth MOS transistor Q4; the drain of the first MOS transistor Q1 is connected to the positive pole of the direct current input, the source thereof is connected with the drain of the second MOS transistor Q2, and the source of the second MOS transistor Q2 is connected to the negative pole of the direct current input; the drain of the third MOS transistor Q3 is connected to the positive pole of the dc input, the source thereof is connected to the drain of the fourth MOS transistor Q4, and the source of the fourth MOS transistor Q4 is connected to the negative pole of the dc input.
3. The dc remote power supply system with multiple backup functions for high-speed electromechanical devices as claimed in claim 2, wherein: the front-end circuit unit further comprises a first inductor L1, a second inductor L2, and a third inductor L3, and a first switch K1, a second switch K2, and a third switch K3; the first inductor L1 and the first switch L1 are connected in series and then are arranged between the source of the first MOS transistor Q1 and the anode of the battery; the second inductor L2 and the second switch K2 are connected in series and then disposed between the source of the first MOS transistor Q1 and the source of the third MOS transistor Q3; the third inductor L3 and the third switch K3 are connected in series and then disposed between the source of the third MOS transistor Q3 and the anode of the photovoltaic cell panel.
4. The dc remote power supply system with multiple backup functions for high-speed electromechanical devices as claimed in claim 3, wherein: the negative pole of the storage battery is connected with the negative pole of the direct current input, and the negative pole of the photovoltaic cell panel is connected with the negative pole of the direct current input.
5. The dc remote power supply system with multiple backup functions for high-speed electromechanical devices as claimed in claim 3, wherein: the front-end circuit unit further comprises a fifth switch K5, and the fifth switch K5 is disposed on a dc input positive line between the drain of the first MOS transistor Q1 and the drain of the third MOS transistor Q3.
6. The dc remote power supply system with multiple backup functions for high-speed electromechanical devices as claimed in claim 1, wherein: the off-grid inversion unit comprises a single-phase inversion full-bridge circuit and an LCL filter, and the output end of the front-end circuit unit is connected with the input end of the single-phase inversion full-bridge circuit and then provides single-phase 220V alternating current for the load through LCL filtering.
7. The dc remote power supply system with multiple backup functions for high-speed electromechanical devices as claimed in claim 1, wherein: the off-grid inversion unit comprises a three-phase inversion full-bridge circuit and an LCL filter, and the output end of the front-end circuit unit is connected with the input end of the three-phase inversion full-bridge circuit and then provides three-phase 380V alternating current for the load through LCL filtering.
8. The dc remote power supply system with multiple backup functions for high-speed electromechanical devices as claimed in claim 5, wherein: the controller controlling the operating mode of the remote machine includes:
step 1: detecting whether the value of the remote supply direct current input voltage is within a set threshold range, and if so, executing a step 2; if not, executing the step 5;
step 2: controlling a second switch K2 to be closed, detecting whether the storage battery is in a state of needing charging, if not, executing a step 3, and if so, executing a step 4;
and step 3: the first MOS tube Q1, the second MOS tube Q2, the third MOS tube Q3, the fourth MOS tube Q4 and the second inductor L2 form a BUCK/BOOST circuit, and the remote supply direct current input voltage is stabilized to be a fixed voltage value and then is input into the off-grid inverter unit;
and 4, step 4: the first switch K1 is controlled to be closed, and the first MOS tube Q1, the second MOS tube Q2 and the first inductor L1 form a BUCK circuit to charge the storage battery; the third MOS tube Q3, the fourth MOS tube Q4 and the second inductor L2 form a BOOST circuit, and the remote supply direct current input voltage is stabilized to be a fixed voltage value and then is input into the off-grid inverter unit;
and 5: detecting whether the photovoltaic cell panel can normally output, if so, executing a step 6, and if not, executing a step 9;
step 6: controlling the third switch K3 to be closed, detecting whether the storage battery is in a state of needing to be charged, if not, executing the step 7, and if so, executing the step 8;
and 7: the third MOS tube Q3, the fourth MOS tube Q4 and the second inductor L2 form a BOOST circuit, and the output voltage of the photovoltaic cell panel is stabilized to be a fixed voltage value and then is input into the off-grid inversion unit;
and 8: the first switch K1 and the fifth switch K5 are controlled to be closed, the third MOS tube Q3, the fourth MOS tube Q4 and the second inductor L2 form a BOOST circuit, and the output voltage of the photovoltaic cell panel is stabilized to be a fixed voltage value and then is input into the off-grid inverter unit; the first MOS tube Q1, the second MOS tube Q2 and the first inductor L1 form a BUCK circuit to charge the storage battery;
and step 9: detecting whether the storage battery can provide electric energy, if so, executing the step 10, and if not, giving a power supply fault alarm;
step 10: and the first switch K1 and the second switch K2 are controlled to be closed, the third MOS tube Q3, the fourth MOS tube Q4, the first inductor L1 and the second inductor L2 form a BOOST circuit, and the output voltage of the storage battery is stabilized to be a fixed voltage value and then is input into the off-grid inverter unit.
9. The dc remote power supply system with multiple backup functions for high-speed electromechanical devices as claimed in claim 1, wherein: the direct-current remote power supply system further comprises at least one local terminal, the local terminal is provided with an alternating-current input end and a direct-current output end, alternating current of AC220V or AC380V is input to the alternating-current input end, direct-current output ends of the local terminal output direct current of DC 300V-DC 1000V, and the direct-current output ends of the local terminal are connected with at least one remote terminal through cables to provide remote direct-current input voltage for the remote terminal.
10. The dc remote power supply system with multiple backup functions for high-speed electromechanical devices as claimed in claim 9, wherein: two local-end machines respectively positioned in two adjacent electricity taking places are set as mutual standby.
CN202210607161.1A 2022-05-31 2022-05-31 Direct current remote power supply system with multiple standby functions and suitable for high-speed electromechanical equipment Pending CN114977469A (en)

Priority Applications (1)

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CN202210607161.1A CN114977469A (en) 2022-05-31 2022-05-31 Direct current remote power supply system with multiple standby functions and suitable for high-speed electromechanical equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210607161.1A CN114977469A (en) 2022-05-31 2022-05-31 Direct current remote power supply system with multiple standby functions and suitable for high-speed electromechanical equipment

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CN114977469A true CN114977469A (en) 2022-08-30

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