CN114583839A - Direct-current high-voltage control method and control system - Google Patents
Direct-current high-voltage control method and control system Download PDFInfo
- Publication number
- CN114583839A CN114583839A CN202210483229.XA CN202210483229A CN114583839A CN 114583839 A CN114583839 A CN 114583839A CN 202210483229 A CN202210483229 A CN 202210483229A CN 114583839 A CN114583839 A CN 114583839A
- Authority
- CN
- China
- Prior art keywords
- main control
- control switch
- auxiliary
- switch
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000006854 communication Effects 0.000 claims abstract description 94
- 238000004891 communication Methods 0.000 claims abstract description 94
- 238000001514 detection method Methods 0.000 claims description 37
- 230000002159 abnormal effect Effects 0.000 claims description 25
- 230000005669 field effect Effects 0.000 claims description 3
- 230000003993 interaction Effects 0.000 claims description 3
- 238000010248 power generation Methods 0.000 abstract description 14
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 230000005856 abnormality Effects 0.000 description 9
- 230000007175 bidirectional communication Effects 0.000 description 6
- 238000010891 electric arc Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- 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
- H02H3/08—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 responsive to excess current
- H02H3/087—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 responsive to excess current for dc applications
-
- 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
- H02J13/00001—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 the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
-
- 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
- H02J13/00006—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 information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
-
- 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
Abstract
A direct current high voltage control method and a control system are provided, the control method comprises the following steps: respectively establishing communication connection between the communication acquisition unit and the first main control unit, the plurality of second main control units and the server, and connecting the first main control unit and the plurality of second main control units with the photovoltaic group in series; the output end of each photovoltaic module is connected with a master switch in series; connecting any main control switch in parallel with an auxiliary control switch; the driving ends of the main control switch and the auxiliary control switch which are connected with the auxiliary control switch in parallel are respectively connected with the first main control unit, and the other main control switches are respectively connected with the plurality of second main control units in a one-to-one correspondence manner; and (3) switching off the large current of the string: the first main control unit firstly controls the auxiliary control switch to be conducted; then the main control switch in the short-circuited state is controlled to be switched off, and finally the auxiliary control switch is controlled to be switched off; and (3) switching off the high voltage of the string: and the second main control units control the other main control switches to be switched off. The impact of large current is solved, the switching cost is reduced, the service life is prolonged, and meanwhile, the power generation reliability is improved.
Description
Technical Field
The invention belongs to the field of photovoltaic power generation, and particularly relates to a direct-current high-voltage control method and a direct-current high-voltage control system.
Background
In recent years, with the rapid development of the photovoltaic industry, photovoltaic power generation is rapidly replacing chemical energy sources to become main energy sources. However, in a power generation system with a photovoltaic module, when a fault or a short circuit needs to be repaired or a fire disaster or other emergency situation occurs, the dc high-voltage shutdown of the photovoltaic module at this level needs to be realized, and in the shutdown process, the problems of large current and high voltage need to be overcome, if the problems cannot be overcome, serious damage can be caused to equipment, maintainers or firefighters, and the development and industrialization of the photovoltaic power generation technology in China can be further hindered. Simultaneously, solve the high difficult problem of photovoltaic power plant operation maintenance cost, promote user experience, realize that the high quality development of photovoltaic trade also is the problem that needs solve urgently at present.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a direct-current high-voltage control method which solves the problems of large current and high voltage impact in the turn-off process of a photovoltaic module. The invention also provides a control system.
According to the embodiment of the first aspect of the invention, the direct-current high-voltage control method comprises the following steps:
respectively establishing communication connection between a communication acquisition unit and a first master control unit, a plurality of second master control units and a server, and connecting the first master control unit and the second master control units with a photovoltaic group in series;
the output end of each photovoltaic module is connected with a main control switch in series and each main control switch is in a closed state, and the main control switch is connected with the output end of the photovoltaic module in series through a normally closed contact; connecting any main control switch in the photovoltaic group string with an auxiliary control switch in parallel, and enabling the auxiliary control switch to be in a disconnected state; the main control switch connected with the auxiliary control switch in parallel and the driving end of the auxiliary control switch are respectively connected with the first main control unit, and the rest main control switches are respectively connected with the plurality of second main control units in a one-to-one correspondence manner;
and (3) switching off the large current of the string: the first main control unit firstly controls the auxiliary control switch to be conducted so that the main control switch connected with the auxiliary control switch in parallel is in a short-circuited state; the first main control unit then controls the main control switch in the short-circuited state to be switched off, and after the main control switch is confirmed to be switched off, the first main control unit controls the auxiliary control switch to be switched off;
and (3) switching off the high voltage of the string: and after the auxiliary control switches are confirmed to be disconnected, the second main control units control the rest main control switches to be disconnected.
The direct-current high-voltage control method provided by the embodiment of the invention at least has the following technical effects: and establishing communication connection among the communication acquisition unit, the server, the first main control unit and the plurality of second main control units to complete equipment initialization. When the equipment is abnormal, the first main control unit can automatically start a loop shutdown mode. In the loop turn-off mode, the first main control unit firstly controls the auxiliary control switch connected with the main control switch in parallel to enable the auxiliary control switch to be conducted, at the moment, the main control switch connected with the auxiliary control switch in parallel is short-circuited, and the auxiliary control switch is connected with the photovoltaic group in series and conducted. The first main control unit controls the main control switch connected with the auxiliary control switch in parallel to be disconnected, so that the risk of arc discharge when the main control switch is disconnected is avoided, the main control switch is not damaged, and the safety factor is improved. And after the main control switch is disconnected, the first main control unit controls the auxiliary control switch to be disconnected, so that the current of the whole loop is cut off. After the current is cut off, the second main control units control all the rest main control switches to be switched off, so that the high-voltage cut-off is completed. The impact of large current is effectively solved through the auxiliary control switch, and the current is cut off in an auxiliary mode through only one auxiliary control switch, so that the size of the auxiliary control switch is reduced, the size required by the main control switch is also reduced, and the cost is reduced. By providing a plurality of distributed master switches, the high voltage is cut off. In addition, when the photovoltaic string works normally, the main control switch is in a normally closed state, and the auxiliary control switch is in an off state, so that the power consumption of the whole photovoltaic power generation device is effectively reduced, and the cost is saved.
According to some embodiments of the present invention, before the first main control unit first controls the auxiliary switch to be turned on, the method further includes:
and sending a turn-off instruction to the communication acquisition unit through a server, and forwarding the turn-off instruction to the first main control unit by the communication acquisition unit.
According to some embodiments of the present invention, after confirming that the auxiliary control switch is turned off, the main control unit controls the remaining main control switches to be turned off, including the following steps:
and the second main control units control the rest main control switches to be switched off simultaneously or respectively.
According to some embodiments of the invention, the auxiliary control switch is a field effect transistor or an IGBT.
According to some embodiments of the invention, the dc high voltage control method further comprises: collecting the string temperature of the photovoltaic string by a temperature detection unit connected with the first main control unit and the plurality of second main control units; the group string temperature exceeds a preset safe temperature value or the group string temperature rise rate exceeds a preset temperature safe rise rate, the main control unit sends a temperature abnormity detection result to the communication acquisition unit, and the communication acquisition unit sends an overtemperature early warning instruction to the server.
According to some embodiments of the invention, the dc high voltage control method further comprises: collecting current data of the output end of the photovoltaic string through a current detection unit connected with the first main control unit and the second main control units; when the current data is abnormal, the first main control unit or any one of the second main control units sends a current abnormity detection result to the communication acquisition unit, and the communication acquisition unit sends a current abnormity early warning instruction to the server.
According to some embodiments of the invention, the dc high voltage control method further comprises: collecting first voltage data of the output end of the photovoltaic string through a first voltage detection unit connected with the first main control unit and a plurality of second main control units; when the first voltage data is abnormal, the first main control unit or any one of the second main control units sends a first voltage abnormity detection result to the communication acquisition unit, and the communication acquisition unit sends a voltage abnormity early warning instruction to the server.
According to some embodiments of the invention, the dc high voltage control method further comprises: the second voltage data of the output end of the main control switch, which are connected with the auxiliary control switch in parallel, are acquired through a second voltage detection unit connected with the first main control unit and the plurality of second main control units, the second voltage data exceed a preset safe voltage value, the first main control unit or any one of the second main control units sends a second voltage abnormity detection result to the communication acquisition unit, and the communication acquisition unit sends a turn-off failure instruction to the server.
According to some embodiments of the present invention, the first master control unit, the plurality of second master control units and the communication collection unit, and the communication collection unit and the server all use wireless communication.
According to a second aspect of the present invention, a control system for applying the dc high voltage control method of the first aspect comprises:
the photovoltaic group string comprises a plurality of photovoltaic modules which are sequentially connected in series;
the main control switches are connected with the output ends of the photovoltaic modules in a one-to-one corresponding mode in series, and are used for cutting off the output of the photovoltaic module strings;
the auxiliary control switch is connected with any one of the main control switches in parallel and used for short-circuiting the main control switches connected with the auxiliary control switches in parallel;
the first main control unit is electrically connected with the auxiliary control switch and the main control switch connected in parallel with the auxiliary control switch;
the second main control units are electrically connected with the rest main control switches in a one-to-one correspondence manner;
the communication acquisition unit is electrically connected with the first main control unit and the plurality of second main control units, and the communication acquisition unit is used for carrying out data interaction with the first main control unit and the plurality of second main control units and the server.
The direct-current high-voltage control method provided by the embodiment of the invention at least has the following technical effects: and establishing communication connection among the communication acquisition unit, the server, the first main control unit and the plurality of second main control units to complete equipment initialization. When the equipment is abnormal, the first main control unit can automatically start a loop shutdown mode. In the loop turn-off mode, the first main control unit firstly controls the auxiliary control switch connected with the main control switch in parallel to enable the auxiliary control switch to be conducted, at the moment, the main control switch connected with the auxiliary control switch in parallel is short-circuited, and the auxiliary control switch is connected with the photovoltaic group in series and conducted. The first main control unit controls the main control switch connected with the auxiliary control switch in parallel to be disconnected, so that the risk of arc discharge when the main control switch is disconnected is avoided, the main control switch is not damaged, and the safety factor is improved. And after the main control switch is disconnected, the first main control unit controls the auxiliary control switch to be disconnected, so that the current of the whole loop is cut off. After the current is cut off, the second main control units control all the rest main control switches to be switched off, and therefore the high-voltage cutting-off is completed. The impact of large current is effectively solved through the auxiliary control switch, and the current is cut off in an auxiliary mode through only one auxiliary control switch, so that the size of the auxiliary control switch is reduced, the size required by the main control switch is also reduced, and the cost is reduced. By providing a plurality of distributed master switches, the high voltage is cut off. In addition, when the photovoltaic string works normally, the main control switch is in a normally closed state, and the auxiliary control switch is in an off state, so that the power consumption of the whole photovoltaic power generation device is effectively reduced, and the cost is saved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block diagram of a string high current shutdown system of a control system of an embodiment of the present invention;
FIG. 2 is a flow chart of a control system shutdown according to an embodiment of the present invention;
FIG. 3 is a flow chart of control system closure according to an embodiment of the present invention;
fig. 4 is a circuit schematic diagram of the shutdown portion of the control system of an embodiment of the present invention.
Reference numerals:
a communication acquisition unit 110, a photovoltaic module 120, a main control switch 130, an auxiliary control switch 140, a server 150,
A temperature detection unit 210, a current detection unit 220, a first voltage detection unit 230, and a second voltage detection unit 240.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the directional descriptions, such as the directions of upper, lower, front, rear, left, right, etc., are referred to only for convenience of describing the present invention and for simplicity of description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If there is a description of first and second for the purpose of distinguishing technical features only, this is not to be understood as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
A dc high voltage control method according to an embodiment of the first aspect of the invention is described below with reference to fig. 1 to 4.
The direct-current high-voltage control method comprises the following steps of:
respectively establishing communication connection between the communication acquisition unit 110 and the first main control unit, the plurality of second main control units and the server 150, and connecting the first main control unit and the plurality of second main control units with the photovoltaic group in series;
the output end of each photovoltaic module 120 is connected in series with a main control switch 130, and each main control switch 130 is in a closed state, and the main control switch 130 is connected in series with the output end of the photovoltaic module 120 through a normally closed contact; connecting any main control switch 130 in the photovoltaic string with an auxiliary control switch 140 in parallel, and enabling the auxiliary control switch 140 to be in a disconnection state; the driving ends of the main control switches 130 and the auxiliary control switches 140 which are connected with the auxiliary control switches 140 in parallel are respectively connected with the first main control unit, and the other main control switches 130 are respectively connected with the plurality of second main control units in a one-to-one correspondence manner;
and (3) switching off the large current of the string: the first main control unit firstly controls the auxiliary control switch 140 to be turned on, so that the main control switch 130 connected in parallel with the auxiliary control switch 140 is in a short-circuited state; the first main control unit then controls the main control switch 130 in the short-circuited state to be switched off, and after the main control switch 130 is confirmed to be switched off, the first main control unit controls the auxiliary control switch 140 to be switched off;
and (3) switching off the high voltage of the string: after confirming that the auxiliary control switch 140 is turned off, the plurality of second main control units control the remaining main control switches 130 to be turned off.
Referring to fig. 1, 2 and 4, the first master control unit and the plurality of second master control units are in bidirectional communication with the communication acquisition unit 110, and the communication acquisition unit 110 is in bidirectional communication with the server 150. When an abnormal emergency occurs, or needs to be overhauled, or the device is detected to be abnormal, the first main control unit or any second main control unit can feed back the abnormal situation to the communication acquisition unit 110, the communication acquisition unit 110 can further send the abnormal situation to the server 150, and the server 150 can remotely control the first main control unit to start a loop shutdown mode after data judgment. Since the main control switch 130 is connected in series to the output end of the photovoltaic module 120 through the normally closed contact, the first main control unit firstly provides a 15V conduction voltage to the auxiliary control switch 140 to control the auxiliary control switch 140 to conduct, so that the auxiliary control switch 140 and the photovoltaic module 120 form a new loop, the main control switch 130 connected in parallel with the auxiliary control switch 140 is short-circuited, and after it is determined that the main control switch 130 connected in parallel with the auxiliary control switch 140 is completely short-circuited, the first main control unit provides a 12V voltage to the short-circuited main control switch 130 to disconnect the main control switch 130. After the main control switch 130 is turned off, the first main control unit further decreases the on-state voltage of the auxiliary control switch 140 to 0, and controls the auxiliary control switch 140 to be turned off, thereby completing the turn-off of the large current of the series circuit. After the large current is turned off, the second main control units control all the other main control switches 130 to be turned off, so that the high voltage is turned off. It should be noted that the on-voltage of the auxiliary switch 140 and the off-enable voltage of the main switch 130 are maintained for about 2 seconds, but this embodiment is not limited thereto, and the time setting is reasonable.
According to the dc high voltage control method of the embodiment of the present invention, the communication connection between the communication acquisition unit 110, the server 150, and the main control unit is established, and the device initialization is completed. When the equipment is abnormal, the first main control unit can automatically start a loop shutdown mode. In the loop off mode, the first main control unit first controls the auxiliary switch 140 connected in parallel with the main control switch 130, so that the auxiliary switch 140 is turned on, at this time, the main control switch 130 connected in parallel with the auxiliary switch 140 is short-circuited, and the auxiliary switch 140 is connected in series with the photovoltaic string. The first main control unit then controls the main control switch 130 connected in parallel with the auxiliary control switch 140 to be switched off, so that the risk of arc discharge when the main control switch 130 is switched off is avoided, the main control switch 130 is not damaged, and the safety factor is improved. After the main control switch 130 is turned off, the first main control unit controls the auxiliary control switch 140 to turn off, thereby completing the current cutoff of the whole loop. After the current is cut off, the second master control units control all the rest master control switches 130 to be turned off, so that the high voltage is cut off. The impact of large current is effectively solved through the auxiliary control switch 140, and only one auxiliary control switch 140 is needed to assist in cutting off the current, so that the volume of the auxiliary control switch 140 is reduced, and the volume required by the main control switch 130 is also reduced, and the cost is reduced. By providing a plurality of distributed master switches 130, the high voltage is cut off. In addition, when the photovoltaic string normally works, the main control switch 130 is in a normally closed state, and the auxiliary control switch 140 is in an off state, so that the power consumption of the whole photovoltaic power generation device is effectively reduced, and the cost is saved.
In some embodiments of the invention, method steps for closing after a photovoltaic system is shut down are also presented. Referring to fig. 3, when the photovoltaic system normally needs to be restarted to recover photovoltaic power generation, the server 150 issues a restart close instruction to the communication acquisition unit 110, and then sequentially sends the instruction to the plurality of second main control units and the first main control unit. After receiving the restart closing instruction, the second master control units first control the master control switches 130 not connected in parallel with the auxiliary control switches 140 to be closed, and in order to avoid burning out of any master control switch 130, in the closing process, it is necessary to ensure that all the master control switches 130 not connected in parallel with the auxiliary control switches 140 are closed and then perform the subsequent closing step. After all the other main control switches 130 are confirmed to be closed, the first main control unit controls the auxiliary control switch 140 to be turned on, then controls the main control switch 130 connected in parallel with the auxiliary control switch 140 to be turned on, and after the main control switch 130 is confirmed to be turned on, the first main control unit controls the auxiliary control switch 140 to be turned off. And finishing the restarting work of the power generation of the photovoltaic module 120.
In some embodiments of the present invention, the master switch 130 employs a relay. Because the auxiliary control switch 140 is added to bear the impact of a large current, the main control switch 130 can use a conventional relay, and does not need to use a relay with a large volume, a high voltage (1500V) and a high specification, so that the cost of the device is reduced.
In some embodiments of the present invention, each master switch 130 is connected in series with the output of each photovoltaic module 120 through a normally closed contact. The main control switch 130 is connected to the output end of the photovoltaic module 120 in two ways, one is through a normally open contact, and the other is through a normally closed contact. When the main control switch 130 is connected in series with the output end of the photovoltaic module 120 through the normally open contact, the control coil of the main control switch 130 needs to be kept in an electrified state all the time, and the coil is aged more quickly due to overlong electrifying time, so that the service life is greatly reduced, and the power consumption during working can be increased. In case of a fault of the main control switch 130, the whole device loop can be in fault, great trouble is brought to maintenance, and meanwhile, the power generation reliability is reduced. The normally closed contact selected in this embodiment can effectively avoid the above problems, and the control coil needs to be powered on only when the main control switch 130 needs to be turned off, so that the service life of the main control switch 130 is effectively prolonged, the power generation reliability is improved, and the working power consumption during power generation is reduced.
In some embodiments of the present invention, the first master control unit and the second master control unit may adopt a CH573 series single chip microcomputer. The communication acquisition unit 110 may be an ARM-series single chip microcomputer, and the number of functional interfaces of the series single chip microcomputer is sufficient, so as to meet the requirements of the embodiment of the present invention. However, the specific use model is not limited in this embodiment and can be set reasonably according to actual conditions.
In some embodiments of the present invention, before the first main control unit first controls the auxiliary control switch 140 to be turned on, the method further includes the following steps:
the server 150 sends a current turn-off command to the communication collection unit 110, and the communication collection unit 110 forwards the current turn-off command to the first main control unit.
Referring to fig. 1, 2 and 4, the first master control unit, the plurality of second master control units and the communication collection unit 110 are in bidirectional communication, and the communication collection unit 110 is in bidirectional communication with the server 150. When an abnormal emergency occurs, or needs to be overhauled, or the device is detected to be abnormal, the first main control unit feeds back the abnormal situation to the communication acquisition unit 110, the communication acquisition unit 110 further sends the abnormal situation to the server 150, the server 150 sends a current turn-off instruction to the communication acquisition unit 110 after data judgment, the communication acquisition unit 110 sends the current turn-off instruction to the first main control unit, and the first main control unit enters a loop turn-off mode. In addition, the first main control unit can also automatically start a loop shutdown mode to play a role of a protection device.
In some embodiments of the present invention, after confirming that the auxiliary control switch 140 is turned off, the second master control units control the remaining master control switches 130 to be turned off, including the following steps: the plurality of second master control units control the remaining master control switches 130 to be turned off simultaneously or separately. When the second master control units control the rest of the master control switches 130 to be turned off, the broadcast command may be issued to turn off the master control switches 130 at the same time, or the commands may be issued in sequence to turn off the rest of the master control switches 130 in sequence, so as to finally achieve the purpose of cutting off the high voltage. The embodiment does not limit the turn-off mode and can be reasonably set.
In some embodiments of the present invention, the auxiliary control switch 140 is a field effect transistor or an IGBT. The selection of the auxiliary control switch 140 needs to bear the impact of a large current, and specifically, the auxiliary control switch 140 adopted in the present embodiment is an IGBT. However, the present embodiment does not limit the use of the auxiliary control switch 140, and can achieve the same effect.
In some embodiments of the present invention, specifically, the IGBT model adopted in this embodiment is IHW30N160R 5.
In some embodiments of the invention, further comprising the steps of: collecting the string temperature of the photovoltaic string by a temperature detection unit 210 connected with the first main control unit and the plurality of second main control units; when the temperature of the cluster exceeds a preset safe temperature value or the temperature rise rate of the cluster exceeds a preset safe temperature rise rate, the first main control unit or any second main control unit sends a temperature abnormity detection result to the communication acquisition unit 110, and the communication acquisition unit 110 sends an overtemperature early warning instruction to the server 150. Referring to fig. 1, the temperature of the photovoltaic string is collected by the temperature collection unit, when the collected temperature value exceeds a preset temperature value or the temperature increase rate exceeds a preset safe increase rate, the first main control unit or any one of the second main control units sends a temperature anomaly detection result to the communication collection unit 110, and then sends an overtemperature early warning signal to the server 150 by the communication collection unit 110. After the server 150 determines the data, it sends a command to the first main control unit through the communication acquisition unit 110, and starts the loop shutdown mode.
In some embodiments of the present invention, the temperature detection unit 210 employs a resistance type temperature sensor. The resistance-type temperature sensor can further improve the precision of temperature detection, and can meet the requirement of partial environment needing higher-precision temperature monitoring. Meanwhile, the resistance-type temperature sensor is low in cost, and when the resistance-type temperature sensor is applied to temperature collection, collection of temperature data of the photovoltaic string can be achieved only through a simple voltage division circuit.
In some embodiments of the present invention, the dc high voltage control method further includes: collecting current data of the output end of the photovoltaic string through a current detection unit 220 connected with the first main control unit and the plurality of second main control units; when the current data is abnormal, the first master control unit or any one of the second master control units sends a current abnormality detection result to the communication acquisition unit 110, and the communication acquisition unit 110 sends a current abnormality warning instruction to the server 150. Referring to fig. 1, the current data at the output end of the photovoltaic string is collected by the current detection unit 220, when the current data is abnormal, the first main control unit or any one of the second main control units sends a current abnormality detection result to the communication collection unit 110, and then sends a current abnormality warning instruction to the server 150 by the communication collection unit 110. After the server 150 determines the data, it sends a command to the first main control unit through the communication acquisition unit 110, and starts the loop shutdown mode.
In some embodiments of the present invention, the dc high voltage control method further includes: collecting first voltage data of the output end of the photovoltaic string through a first voltage detection unit 230 connected with the first main control unit and a plurality of second main control units; when the first voltage data is abnormal, the first master control unit or any one of the second master control units sends a first voltage abnormality detection result to the communication acquisition unit 110, and the communication acquisition unit 110 sends a voltage abnormality early warning instruction to the server 150. Referring to fig. 1, voltage data at the output end of the photovoltaic string is collected by the first voltage detection unit 230, when the first voltage data is abnormal, the first main control unit or any one of the second main control units sends a first voltage abnormality detection result to the communication collection unit 110, and then sends a voltage abnormality warning instruction to the server 150 by the communication collection unit 110. After the server 150 determines the data, it sends a command to the first main control unit through the communication acquisition unit 110, and starts the loop shutdown mode.
In some embodiments of the present invention, the dc high voltage control method further includes: the second voltage data of the output end of the main control switch 130 connected in parallel with the auxiliary control switch 140 is collected by a second voltage detection unit 240 connected with the first main control unit and the plurality of second main control units, the second voltage data exceeds a preset safe voltage value, the first main control unit or any second main control unit sends a second voltage abnormity detection result to the communication collection unit 110, and the communication collection unit 110 sends a turn-off failure instruction to the server 150. Referring to fig. 1, the second voltage detection unit 240 is used to collect voltage data at the output end of the main control switch 130 connected in parallel with the auxiliary control switch 140, and when the second voltage data is abnormal, the first main control unit or any one of the second main control units sends a second voltage abnormality detection result to the communication collection unit 110, and then sends a shutdown failure instruction to the server 150 through the communication collection unit 110. After the server 150 determines the data, it sends a command to the first main control unit through the communication acquisition unit 110, and starts the loop shutdown mode again. In the shutdown process of the present embodiment, the high voltage is shut off only when it is confirmed that the large current is shut off.
In some embodiments of the present invention, wireless communication is used between the first master control unit, the plurality of second master control units and the communication acquisition unit 110, and between the communication acquisition unit 110 and the server 150. Wireless communication has wireless transmission methods such as WIFI, Bluetooth, zigBee, and this embodiment does not restrict this, according to actual conditions reasonable setting can.
A control system according to an embodiment of the second aspect of the invention, comprising: photovoltaic group cluster, master control switch 130, auxiliary switch 140, master control unit, communication acquisition unit 110.
A photovoltaic string comprising a plurality of photovoltaic modules 120 connected in series in sequence;
the plurality of main control switches 130 are connected in series with the output ends of the plurality of photovoltaic modules 120 in a one-to-one correspondence manner, and the main control switches 130 are used for cutting off the output of the photovoltaic module strings;
an auxiliary switch 140 connected in parallel with any one of the main switches 130, the auxiliary switch 140 being used to short-circuit the main switch 130 connected in parallel with the auxiliary switch 140;
a first main control unit electrically connected to the auxiliary control switch 140 and the main control switch 130 connected in parallel to the auxiliary control switch 140;
the second main control units are electrically connected with the rest main control switches 130 in a one-to-one correspondence manner;
the communication acquisition unit 110 is electrically connected to the first main control unit and the plurality of second main control units, and the communication acquisition unit 110 is configured to perform data interaction with the first main control unit and the plurality of second main control units and the server 150.
Referring to fig. 4, the first master control unit and the plurality of second master control units are in bidirectional communication with the communication collection unit 110, and the communication collection unit 110 is in bidirectional communication with the server 150. When an abnormal emergency occurs, or needs to be overhauled, or the device is detected to be abnormal, the first main control unit or any second main control unit can feed back the abnormal situation to the communication acquisition unit 110, the communication acquisition unit 110 can further send the abnormal situation to the server 150, the server 150 can send a turn-off instruction to the communication acquisition unit 110 after data judgment, and the communication acquisition unit 110 sends the turn-off instruction to the first main control unit. Since the main control switch 130 is connected in series to the output end of the photovoltaic module 120 through the normally closed contact, the first main control unit firstly provides a 15V conduction voltage to the auxiliary control switch 140 to control the auxiliary control switch 140 to conduct, so that the auxiliary control switch 140 and the photovoltaic module 120 form a new loop, the main control switch 130 connected in parallel with the auxiliary control switch 140 is short-circuited, and after it is determined that the main control switch 130 connected in parallel with the auxiliary control switch 140 is completely short-circuited, the first main control unit provides a 12V voltage to the short-circuited main control switch 130 to disconnect the main control switch 130. After the main control switch 130 is turned off, the first main control unit further decreases the on-state voltage of the auxiliary control switch 140 to 0, and controls the auxiliary control switch 140 to be turned off, thereby completing the turn-off of the large current of the series circuit. After the large current is turned off, the second main control units control all the other main control switches 130 to be turned off, so that the high voltage is turned off.
According to the control method of the direct-current high-voltage control method provided by the embodiment of the invention, the communication connection among the communication acquisition unit 110, the server 150, the first main control unit and the plurality of second main control units is established, and the equipment initialization is completed. When the equipment is abnormal, the first main control unit can automatically start a loop shutdown mode. In the loop off mode, the first main control unit first controls the auxiliary switch 140 connected in parallel with the main control switch 130, so that the auxiliary switch 140 is turned on, at this time, the main control switch 130 connected in parallel with the auxiliary switch 140 is short-circuited, and the auxiliary switch 140 is connected in series with the photovoltaic string. The first main control unit then controls the main control switch 130 connected in parallel with the auxiliary control switch 140 to be switched off, so that the risk of arc discharge when the main control switch 130 is switched off is eliminated, the main control switch 130 is not damaged, and the safety factor is improved. After the main control switch 130 is turned off, the first main control unit controls the auxiliary control switch 140 to turn off, thereby completing the current cutoff of the whole loop. After the current is cut off, the second master control units control all the rest master control switches 130 to be turned off, so that the high voltage is cut off. The impact of large current is effectively solved through the auxiliary control switch 140, and only one auxiliary control switch 140 is needed to assist in cutting off the current, so that the volume of the auxiliary control switch 140 is reduced, and the volume required by the main control switch 130 is also reduced, and the cost is reduced. By providing a plurality of distributed master switches 130, the high voltage is cut off. In addition, when the photovoltaic string normally works, the main control switch 130 is in a normally closed state, and the auxiliary control switch 140 is in an off state, so that the power consumption of the whole photovoltaic power generation device is effectively reduced, and the cost is saved.
In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the embodiments, and those skilled in the art will understand that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A direct current high voltage control method is characterized by comprising the following steps:
respectively establishing communication connection between a communication acquisition unit and a first master control unit, a plurality of second master control units and a server, and connecting the first master control unit and the second master control units with a photovoltaic group in series;
the output end of each photovoltaic module is connected with a main control switch in series and each main control switch is in a closed state, and the main control switch is connected with the output end of the photovoltaic module in series through a normally closed contact; connecting any main control switch in the photovoltaic group string with an auxiliary control switch in parallel, and enabling the auxiliary control switch to be in a disconnected state; the main control switch connected with the auxiliary control switch in parallel and the driving end of the auxiliary control switch are respectively connected with the first main control unit, and the rest main control switches are respectively connected with the plurality of second main control units in a one-to-one correspondence manner;
and (3) switching off the large current of the string: the first main control unit firstly controls the auxiliary control switch to be conducted so that the main control switch connected with the auxiliary control switch in parallel is in a short-circuited state; the first main control unit then controls the main control switch in the short-circuited state to be switched off, and after the main control switch is confirmed to be switched off, the first main control unit controls the auxiliary control switch to be switched off;
and (3) switching off the high voltage of the string: and after the auxiliary control switches are confirmed to be disconnected, the second main control units control the rest main control switches to be disconnected.
2. The dc high voltage control method according to claim 1, further comprising the following steps before the first main control unit first controls the auxiliary switch to be turned on:
and sending a turn-off instruction to the communication acquisition unit through the server, and forwarding the turn-off instruction to the first main control unit by the communication acquisition unit.
3. The dc high voltage control method according to claim 1, wherein after the determining that the auxiliary control switch is turned off, the second main control units control the remaining main control switches to be turned off, comprising the steps of:
and the second main control units control the rest main control switches to be switched off simultaneously or respectively.
4. The direct-current high-voltage control method according to claim 1, wherein the auxiliary control switch is a field effect transistor or an IGBT.
5. The direct current high voltage control method according to claim 1, further comprising the steps of: collecting the string temperature of the photovoltaic string by a temperature detection unit connected with the first main control unit and the plurality of second main control units; the temperature of the group string exceeds a preset safe temperature value or the temperature rise rate of the group string exceeds a preset safe temperature rise rate, the first main control unit or any second main control unit sends a temperature abnormity detection result to the communication acquisition unit, and the communication acquisition unit sends an overtemperature early warning instruction to the server.
6. The direct current high voltage control method according to claim 1, further comprising the steps of: collecting current data of the output end of the photovoltaic string through a current detection unit connected with the first main control unit and the second main control units; when the current data is abnormal, the first main control unit or any one of the second main control units sends a current abnormity detection result to the communication acquisition unit, and the communication acquisition unit sends a current abnormity early warning instruction to the server.
7. The direct current high voltage control method according to claim 1, further comprising the steps of: collecting first voltage data of the output end of the photovoltaic string through a first voltage detection unit connected with the first main control unit and a plurality of second main control units; when the first voltage data is abnormal, the first main control unit or any one of the second main control units sends a first voltage abnormity detection result to the communication acquisition unit, and the communication acquisition unit sends a voltage abnormity early warning instruction to the server.
8. The direct current high voltage control method according to claim 1, characterized by further comprising the steps of: the second voltage data of the output end of the main control switch, which are connected with the auxiliary control switch in parallel, are acquired through second voltage detection units connected with the first main control unit and the plurality of second main control units, the second voltage data exceed a preset safe voltage value, the first main control unit or any one of the second main control units sends a second voltage abnormity detection result to the communication acquisition unit, and the communication acquisition unit sends a turn-off failure instruction to the server.
9. The method according to claim 1, wherein wireless communication is adopted among the first master control unit, the plurality of second master control units and the communication acquisition unit, and among the communication acquisition unit and the server.
10. A control system to which the direct-current high-voltage control method according to any one of claims 1 to 9 is applied, comprising:
the photovoltaic group string comprises a plurality of photovoltaic modules which are sequentially connected in series;
the main control switches are connected with the output ends of the photovoltaic modules in a one-to-one corresponding mode in series, and are used for cutting off the output of the photovoltaic module strings;
the auxiliary control switch is connected with any one of the main control switches in parallel and used for short-circuiting the main control switches connected with the auxiliary control switches in parallel;
the first main control unit is electrically connected with the auxiliary control switch and the main control switch connected in parallel with the auxiliary control switch;
the second main control units are electrically connected with the rest main control switches in a one-to-one correspondence manner;
the communication acquisition unit is electrically connected with the first main control unit and the plurality of second main control units, and the communication acquisition unit is used for carrying out data interaction with the first main control unit, the plurality of second main control units and the server.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210483229.XA CN114583839B (en) | 2022-05-06 | 2022-05-06 | Direct-current high-voltage control method and control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210483229.XA CN114583839B (en) | 2022-05-06 | 2022-05-06 | Direct-current high-voltage control method and control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114583839A true CN114583839A (en) | 2022-06-03 |
| CN114583839B CN114583839B (en) | 2023-12-12 |
Family
ID=81785194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210483229.XA Active CN114583839B (en) | 2022-05-06 | 2022-05-06 | Direct-current high-voltage control method and control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114583839B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203352192U (en) * | 2013-05-23 | 2013-12-18 | 艾思玛太阳能技术股份公司 | Direct current switch device |
| CN105245186A (en) * | 2015-10-27 | 2016-01-13 | 天津天传新能源电气有限公司 | Solar photovoltaic assembly monitoring and alarming system and working method thereof |
| DE102017107801A1 (en) * | 2017-04-11 | 2018-10-11 | Phoenix Contact Gmbh & Co. Kg | Photovoltaic system, DC hybrid switching device, use and method for turning on and off a photovoltaic string |
| CN208015684U (en) * | 2018-04-18 | 2018-10-26 | 北京汉能光伏投资有限公司 | A kind of terminal box and photovoltaic component system |
| CN110138081A (en) * | 2019-04-12 | 2019-08-16 | 杭州中科先进技术研究院有限公司 | A kind of solar energy string group intelligence turning off system and cut-off method based on ZIGBEE |
| CN212486461U (en) * | 2020-05-26 | 2021-02-05 | 长沙晶辉太阳能有限公司 | Photovoltaic power plant monitored control system |
| CN112736959A (en) * | 2019-10-29 | 2021-04-30 | 株洲中车时代电气股份有限公司 | System and method for monitoring distributed photovoltaic power station |
-
2022
- 2022-05-06 CN CN202210483229.XA patent/CN114583839B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203352192U (en) * | 2013-05-23 | 2013-12-18 | 艾思玛太阳能技术股份公司 | Direct current switch device |
| CN105245186A (en) * | 2015-10-27 | 2016-01-13 | 天津天传新能源电气有限公司 | Solar photovoltaic assembly monitoring and alarming system and working method thereof |
| DE102017107801A1 (en) * | 2017-04-11 | 2018-10-11 | Phoenix Contact Gmbh & Co. Kg | Photovoltaic system, DC hybrid switching device, use and method for turning on and off a photovoltaic string |
| CN208015684U (en) * | 2018-04-18 | 2018-10-26 | 北京汉能光伏投资有限公司 | A kind of terminal box and photovoltaic component system |
| CN110138081A (en) * | 2019-04-12 | 2019-08-16 | 杭州中科先进技术研究院有限公司 | A kind of solar energy string group intelligence turning off system and cut-off method based on ZIGBEE |
| CN112736959A (en) * | 2019-10-29 | 2021-04-30 | 株洲中车时代电气股份有限公司 | System and method for monitoring distributed photovoltaic power station |
| CN212486461U (en) * | 2020-05-26 | 2021-02-05 | 长沙晶辉太阳能有限公司 | Photovoltaic power plant monitored control system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114583839B (en) | 2023-12-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205790155U (en) | Battery bag and power system of electric automobile | |
| CN102874124B (en) | Relay control strategy and device for battery of electric vehicle | |
| CN105305620B (en) | A kind of breaker closing control loop template monitoring system | |
| CN111152659B (en) | Battery pack high-voltage topological structure and relay adhesion detection method based on structure | |
| CN106696724B (en) | A kind of power battery of electric vehicle and its control method, device and electric vehicle | |
| CN104359196B (en) | Data-center-based multiple-connection air conditioner control system and implementation method | |
| CN109491304A (en) | A kind of control system automatic failure detection circuit and fault self-detection method | |
| CN106114236A (en) | A kind of electric motor car bow formula charging system and control method thereof | |
| CN110962606A (en) | Control system and method for emergency cut-off of high-voltage power supply of new energy automobile and new energy automobile | |
| CN104597750A (en) | Core relay fault detection and redundancy control system and control method | |
| CN104793135A (en) | Hybrid electric vehicle relay state detection circuit and method thereof | |
| CN110137902A (en) | One kind prevents flexible direct current power module by-pass switch from refusing combined floodgate circuit and method | |
| CN103612571B (en) | Electric automobile storage battery failure emergency control system | |
| CN110044035A (en) | Variable frequency air-conditioner controller fault tolerable circuit and control method | |
| CN114583839A (en) | Direct-current high-voltage control method and control system | |
| CN114865598A (en) | Current control method and control system | |
| CN110949132A (en) | Power battery system, control method thereof and vehicle | |
| CN208385326U (en) | Extend the control circuit of signal output loop | |
| CN112803546A (en) | Energy storage brake-separating protection system and method | |
| CN205805978U (en) | Electromagnetic starter for coal mine blower system | |
| CN205871947U (en) | Electric automobile controller and electric automobile | |
| CN218567546U (en) | Automatic alarm control device | |
| CN201069463Y (en) | Quick diagnosis instrument for power loss of low-voltage control line | |
| CN215221763U (en) | Energy storage separating brake protection system | |
| CN205202751U (en) | Electric automobile's driving system and electric automobile |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |