CN116231840A - String inverter at photovoltaic side and fire protection system - Google Patents

String inverter at photovoltaic side and fire protection system Download PDF

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Publication number
CN116231840A
CN116231840A CN202211093463.8A CN202211093463A CN116231840A CN 116231840 A CN116231840 A CN 116231840A CN 202211093463 A CN202211093463 A CN 202211093463A CN 116231840 A CN116231840 A CN 116231840A
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China
Prior art keywords
rsd
fire
photovoltaic panel
photovoltaic
control unit
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Pending
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CN202211093463.8A
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Chinese (zh)
Inventor
吴尚
王立昌
方刚
向军
高举
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Goodwe Technologies Co Ltd
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Goodwe Technologies Co Ltd
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Priority to CN202211093463.8A priority Critical patent/CN116231840A/en
Publication of CN116231840A publication Critical patent/CN116231840A/en
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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
    • 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
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C31/00—Delivery of fire-extinguishing material
    • A62C31/02—Nozzles specially adapted for fire-extinguishing
    • A62C31/05—Nozzles specially adapted for fire-extinguishing with two or more outlets
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C37/00—Control of fire-fighting equipment
    • A62C37/36—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device
    • A62C37/38—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone
    • A62C37/40—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone with electric connection between sensor and actuator
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/0096—Radiation pyrometry, e.g. infrared or optical thermometry for measuring wires, electrical contacts or electronic systems
    • 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
    • H02H7/261—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 involving signal transmission between at least two stations
    • H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
    • H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Protection Of Static Devices (AREA)

Abstract

The invention discloses a string inverter at a photovoltaic side and a fire protection system, wherein the string inverter comprises a plurality of RSD modules, an RSD control unit, a Boost MPPT circuit and an inverter circuit, wherein the output ends of the plurality of RSD modules are connected in series and then connected with the input end of the Boost MPPT circuit, and the output end of the inverter circuit is connected with an external alternating current power grid, an energy consumption load or an energy storage device; the RSD control unit is electrically connected with the RSD modules, is provided with a control interface and is used for receiving a turn-off instruction, the turn-off instruction comprises serial number information of the RSD modules needing to be turned off, and the RSD control unit turns off the corresponding RSD modules according to the serial number information in the turn-off instruction so as to disconnect voltage output of the corresponding photovoltaic panel units. The string inverter and the fire protection system provided by the invention can rapidly cut off the high voltage of the photovoltaic panel by means of the RSD module, reduce the voltage below the safety voltage, and greatly improve the safety.

Description

String inverter at photovoltaic side and fire protection system
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a string inverter at a photovoltaic side and a fire protection system.
Background
The photovoltaic power generation technology uses direct current output by a photovoltaic array, converts the direct current into alternating current through an inverter, and transmits the alternating current to a power grid, and is used as a renewable energy power generation technology and is increasingly widely applied. In practical application, the photovoltaic module is taken as a main energy generation unit, so that safe operation is very important, and serious loss can be caused if faults such as burning, arc discharge and the like occur and the photovoltaic module cannot be turned off in time.
The existing micro inverter can be installed near the components, but the micro inverter adopts flyback topology, the input of each flyback converter is directly connected with a photovoltaic panel unit, and 2 to 4 flyback converter outputs are connected in parallel to share a full-bridge grid connection. The flyback topology combined with full-bridge inversion cannot realize reactive power output adjustment, and is high in cost and difficult to popularize in a large scale. The input end of the traditional string inverter is connected with high voltage output by a plurality of panels in series, so that the input voltage which is slightly inverted cannot be lower than the safety voltage, and an external component-level quick shutoff device is required to meet the requirement that the component voltage is lowered to be lower than the safety voltage. And the traditional series inverter system is large and difficult to flexibly install. In addition, the existing photovoltaic system is processed by firefighters after a fire disaster occurs, or is processed by a separate firefighting system, so that the cost and timeliness are difficult to grasp, and larger losses can be caused. If the safety like micro-inversion is needed to be realized, the traditional string type inverter needs to be provided with a module capable of being rapidly turned off at a component level, and a special communication cable or a communication chip is needed, so that the cost and the reliability are not advantageous. Meanwhile, based on safety consideration, an active fire-fighting inverter system for automatically controlling and extinguishing fire of a component needing fire extinguishing treatment after the component is rapidly turned off does not exist at present.
The above disclosure of background art is only for aiding in understanding the inventive concept and technical solution of the present invention, and it does not necessarily belong to the prior art of the present patent application, nor does it necessarily give technical teaching; the above background should not be used to assess the novelty and creativity of the present application without explicit evidence that the above-mentioned content was disclosed prior to the filing date of the present patent application.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a string inverter at a photovoltaic side and a fire protection system. The technical scheme is as follows:
in one aspect, a string inverter at a photovoltaic side is provided, including a plurality of RSD modules, an RSD control unit, a Boost MPPT circuit and an inverter circuit, where an input end of the RSD module is used for accessing a voltage output end of a photovoltaic panel unit, and an output end of the RSD modules is connected in series and then accessed to an input end of the Boost MPPT circuit, an output end of the Boost MPPT circuit is accessed to an input end of the inverter circuit, and an output end of the inverter circuit is used for accessing an external ac power grid, an energy consumption load or an energy storage device;
the RSD control unit is electrically connected with the RSD modules, the RSD control unit is provided with a control interface, the control interface is used for receiving a turn-off instruction, the turn-off instruction comprises serial number information of the RSD modules needing to be turned off, and the RSD control unit turns off the corresponding RSD modules according to the serial number information in the turn-off instruction so as to disconnect voltage output of the corresponding photovoltaic panel units.
Further, the string inverter further comprises a direct current arc detection module, the direct current arc detection module is electrically connected with the control interface of the RSD control unit, if the direct current arc detection module detects that a direct current arc phenomenon occurs in the detection range, a scram instruction is output to the RSD control unit, the scram instruction comprises serial number information of all RSD modules in the detection range of the direct current arc detection module, and the RSD control unit turns off the corresponding RSD modules according to the serial number information in the scram instruction.
Further, the input end of one RSD module is connected to one photovoltaic panel unit or a plurality of photovoltaic panel units at the same time, and the voltage at the input end of each RSD module is smaller than the preset safety voltage.
Further, the RSD module, the RSD control unit, the Boost MPPT circuit and the inverter circuit are integrated.
In yet another aspect, a string inverter with an active shutdown function on a photovoltaic side is provided, which includes a photovoltaic monitoring unit, a fire monitoring device and the string inverter, wherein the photovoltaic monitoring unit is arranged in the string inverter, the fire monitoring device includes one or more infrared probes, the infrared probes are used for collecting temperature information of a photovoltaic panel unit, the photovoltaic panel units in different monitoring ranges of the infrared probes are partially identical or completely different, and all the infrared probes are electrically connected with the photovoltaic monitoring unit; the photovoltaic monitoring unit is pre-stored with a first association information table of the infrared probe and the RSD module;
the photovoltaic monitoring unit judges whether the photovoltaic panel unit corresponding to the infrared probe is abnormal according to the temperature information acquired by the infrared probe, and if so, the serial number information of the RSD module corresponding to the infrared probe is included in a first trigger signal according to a pre-stored first associated information table; the photovoltaic monitoring unit outputs the first trigger signal to the RSD control unit, and the RSD control unit controls the corresponding RSD module to turn off according to the sequence number information in the first trigger signal.
Further, if the temperature value acquired by one infrared probe is found to be greater than the preset temperature threshold value and is maintained for a period of time in real time, judging that the photovoltaic panel unit corresponding to the infrared probe is abnormal;
if the rising speed of the temperature value acquired by one infrared probe in a certain time period is larger than the preset speed value, judging that the photovoltaic panel unit corresponding to the infrared probe is abnormal.
Further, one infrared probe is associated with one or more RSD modules, and the corresponding photovoltaic panel unit of the one or more RSD modules includes all photovoltaic panel units within the monitoring range of the associated infrared probe.
In yet another aspect, a fire protection system on a photovoltaic side is provided, which includes a fire protection device, a fire control unit, and the string inverter, where the fire control unit is disposed in the string inverter, and a monitoring range of the fire monitoring device and a fire extinguishing range of the fire protection device each cover one or more photovoltaic panel units, and the photovoltaic panel units in the monitoring range of the fire monitoring device are partially or completely identical to the photovoltaic panel units in the fire extinguishing range of the fire protection device;
the fire-fighting device comprises one or more fire-fighting spray heads, wherein the fire-fighting spray heads are used for extinguishing fire of the photovoltaic panel unit; the parts of the photovoltaic panel units in the fire extinguishing ranges of different fire-fighting nozzles are the same or completely different, and all the fire-fighting nozzles are electrically connected with the fire-fighting control unit; the photovoltaic monitoring unit is pre-stored with a second association information table of the infrared probe and the fire fighting nozzle;
the photovoltaic monitoring unit judges whether the photovoltaic panel unit corresponding to the infrared probe is abnormal according to the temperature information acquired by the infrared probe, and if so, the serial number information of the fire control spray head corresponding to the infrared probe is included in a second trigger signal according to a pre-stored second associated information table; the photovoltaic monitoring unit outputs the second trigger signal to the fire control unit, and the fire control unit controls the corresponding fire control spray heads to work according to the serial number information in the second trigger signal.
Further, one infrared probe is associated with one or more fire sprinklers, the one or more fire sprinklers having a total fire extinguishing range of photovoltaic panel units comprising all of the photovoltaic panel units within its associated infrared probe monitoring range.
Further, the photovoltaic monitoring unit outputs trigger signals to the RSD control unit and the fire control unit respectively at preset time intervals.
The technical scheme provided by the invention has the following beneficial effects: compared with the traditional micro inverter, the string inverter provided by the invention has higher power density and can realize grid-connected reactive power regulation; in an emergency state, the high voltage of the photovoltaic panel can be cut off rapidly by means of the RSD module, the voltage is reduced below the safety voltage, and the safety is greatly improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a frame of a string inverter according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a first internal circuit of an RSD module in a string inverter according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a second internal circuit of the RSD module in the string inverter according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a third internal circuit of the RSD module in the string inverter according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a fourth internal circuit of the RSD module in the string inverter according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a fifth internal circuit of the RSD module in the string inverter according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a sixth internal circuit of the RSD module in the string inverter according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a seventh internal circuit of an RSD module in a string inverter according to an embodiment of the present invention;
fig. 9 is a schematic diagram of an eighth internal circuit of the RSD module in the string inverter according to an embodiment of the present invention;
fig. 10 is a schematic view of a partial frame in a fire protection system provided by an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
In one embodiment of the present invention, a string inverter on a photovoltaic side is provided, which includes a plurality of RSD modules (i.e., a quick turn-off device), an RSD control unit, a Boost MPPT circuit (i.e., a conventional Boost circuit and a maximum power tracking circuit), and an inverter circuit, which may be integrally integrated to reduce the volume and achieve centralized control.
The input end of the RSD module is used for being connected with the voltage output end of a photovoltaic panel unit (PV), different RSD modules are connected with different photovoltaic panel units, the output ends of all the RSD modules are connected in series and then are connected with the input end of the Boost MPPT circuit, the output end of the Boost MPPT circuit is connected with the input end of the inverter circuit, and the output end of the inverter circuit is used for being connected with an external alternating current power grid, an energy consumption load or an energy storage device so as to realize the functions of inversion grid-connected power generation, power supply or energy storage and the like;
it should be noted that, the input end of one RSD module may be connected to one photovoltaic panel unit to achieve one-to-one correspondence, referring to fig. 1, the photovoltaic panel units are respectively denoted as PV1 and PV2 … PVn, and are in one-to-one correspondence with the RSD modules, and the RSD module is utilized to turn off the output of one or more photovoltaic panel units, so that the serial output of other photovoltaic panel units is not affected; the input of one RSD module may also be connected to a plurality of photovoltaic panel units simultaneously, for example, two photovoltaic panel units are connected in series and then connected to one RSD module, but the voltage at the input of each RSD module is ensured to be smaller than the preset safety voltage.
The RSD control units are respectively and electrically connected with all the RSD modules, the RSD control units are provided with control interfaces, the control interfaces are used for receiving turn-off instructions, the turn-off instructions comprise serial number information of the RSD modules needing to be turned off, and the RSD control units turn off the corresponding RSD modules according to the serial number information in the turn-off instructions so as to disconnect voltage output of the corresponding photovoltaic panel units.
The RSD module needs at least one switch for breaking high voltage, and the switch includes, but is not limited to, components for switching on and off, such as MOS transistors, relays, etc., specifically, referring to fig. 2 to 5, the MOS transistors are added into the RSD module in a serial connection, a parallel connection, and a combination manner of the two, so as to realize separate turn-off of the corresponding photovoltaic panel units, and not affect the output of other photovoltaic panel units connected in series; likewise, referring to fig. 6-9, relay switches are added inside the RSD module in series, parallel, and a combination thereof to achieve individual turn-off of the corresponding photovoltaic panel units. The driving instruction of the RSD module is directly sent by the RSD control unit, and the RSD module is rapidly turned off under the action of the corresponding driving instruction, so that an additional communication cable or a special communication chip is not needed. Compared with the traditional string inverter, the panel quick turn-off function is realized, the control is simple and reliable, and the cost is low.
In this embodiment, the RSD module is inside the string inverter body, and only needs to send an instruction inside the string inverter to control when the photovoltaic panel unit needs to be triggered and turned off, without requiring a long communication cable or a dedicated communication chip. If the fire disaster occurs in the photovoltaic panel units, when the fire disaster needs to be extinguished, the corresponding RSD module is closed through the RSD control unit to cut off the photovoltaic panel units connected in series, so that the high voltage of the photovoltaic panel units is reduced below the safety voltage, and then the fire disaster is extinguished and rescued. The group of string inverters are further provided with a master control device, the master control device is electrically connected with a control interface of the RSD control unit and is provided with a trigger switch for sending off signals to the RSD control unit, the off signals can be instantly controlled and sent by a worker on the master control device, the off time and the off target can also be predefined, the off signals at least comprise serial number information of the RSD module to be turned off, and the RSD control unit sends corresponding driving instructions according to the serial number information to turn off the corresponding RSD module; the master control device can be arranged on the string inverter body, for example, in the form of a control panel, and is connected to the RSD control unit through a cable for communication control; it can also be extended to a longer distance to be set up, for example in the form of a smart terminal, both of which can be signal controlled by establishing wireless communication so as not to be limited by distance. And the system power supply of the string inverter takes power from an external power grid, and the operation of the RSD control unit is not affected by whether the photovoltaic panel has an electric effect or not.
The string inverter provided in this embodiment may be installed on the photovoltaic side, or may be installed remotely, and it adopts a micro string inverter architecture. Because the maximum power tracking function of the string type inverter is realized by the booster circuit, the inverter circuit adopts a common inverter topology, thereby realizing reactive power regulation. The string inverter in the embodiment realizes 2 to 4 flyback converter circuits of the traditional micro-inversion by using one booster circuit, and has higher integration level, smaller volume and lower cost.
In a preferred embodiment, the string inverter further includes a dc arc detection module, the dc arc detection module is electrically connected to the control interface of the RSD control unit, if the dc arc detection module detects that a dc arc phenomenon occurs in the detection range of the dc arc detection module, a scram instruction is output to the RSD control unit, the scram instruction belongs to a special predefined shutdown instruction, the scram instruction includes serial number information of all RSD modules in the detection range of the dc arc detection module, and the corresponding serial number information is stored in the dc arc detection module in advance, so that the direct output is performed after the direct output is triggered, and the RSD control unit shuts down the corresponding RSD module according to the serial number information in the scram instruction.
In one embodiment of the invention, a string inverter with an active turn-off function at a photovoltaic side is provided, and the string inverter comprises a photovoltaic monitoring unit, a fire monitoring device and the string inverter, wherein the photovoltaic monitoring unit is arranged in the string inverter, the fire monitoring device comprises one or more infrared probes, the infrared probes are used for collecting temperature information of a photovoltaic panel unit, the photovoltaic panel units in different monitoring ranges of the infrared probes are partially identical or completely different, and all the infrared probes are electrically connected with the photovoltaic monitoring unit; the photovoltaic monitoring unit is pre-stored with a first association information table of the infrared probe and the RSD module; in the first association information table, one infrared probe is associated with one or more RSD modules, and the photovoltaic panel units corresponding to the one or more RSD modules comprise all photovoltaic panel units in the monitoring range of the associated infrared probe.
The photovoltaic monitoring unit judges whether the photovoltaic panel unit corresponding to the infrared probe is abnormal according to the temperature information acquired by the infrared probe, if so, the sequence number information of the RSD module corresponding to the infrared probe is included in a first trigger signal according to a pre-stored first association information table, the first trigger signal belongs to an actively triggered turn-off instruction, the photovoltaic monitoring unit outputs the first trigger signal to a control interface of the RSD control unit, and the RSD control unit controls the corresponding RSD module to turn off according to the sequence number information in the first trigger signal.
The method for judging the abnormality of the photovoltaic panel unit includes, but is not limited to, the following two methods:
(1) If the temperature value acquired by one infrared probe is found to be greater than the preset temperature threshold value and is maintained for a period of time in real time, judging that the photovoltaic panel unit corresponding to the infrared probe is abnormal; for example, if the preset temperature threshold is 100 ℃ and the maintenance time is 5min, and if the temperature values acquired by the two infrared probes are both greater than 100 ℃ and the real-time maintenance time exceeds 5min, judging that the photovoltaic panel units corresponding to the two infrared probes are abnormal.
(2) If the rising speed of the temperature value acquired by one infrared probe in a certain time period is larger than the preset speed value, judging that the photovoltaic panel unit corresponding to the infrared probe is abnormal. For example, the preset speed value is 50 ℃/min, the certain time period is 2min, and if the average temperature rising speed of the temperature values acquired by the two infrared probes within 2min is found to be greater than 50 ℃/min, the photovoltaic panel units corresponding to the two infrared probes are judged to be abnormal.
In one embodiment of the invention, a fire protection system on a photovoltaic side is provided, which comprises a fire protection device, a fire control unit and the string inverter, wherein the fire control unit is arranged in the string inverter, the monitoring range of the fire protection device and the fire protection range of the fire protection device cover one or more photovoltaic panel units, and the photovoltaic panel units in the monitoring range of the fire protection device are partially or completely identical to the photovoltaic panel units in the fire protection range of the fire protection device;
the fire-fighting device comprises one or more fire-fighting spray heads, wherein the fire-fighting spray heads are used for extinguishing fire of the photovoltaic panel unit; the parts of the photovoltaic panel units in the fire extinguishing ranges of different fire-fighting nozzles are the same or completely different, and all the fire-fighting nozzles are electrically connected with the fire-fighting control unit; the photovoltaic monitoring unit is pre-stored with a second association information table of the infrared probe and the fire fighting nozzle; in the second association information table, one infrared probe is associated with one or more fire sprinklers, and the photovoltaic panel units in the total fire extinguishing range of the one or more fire sprinklers comprise all the photovoltaic panel units in the monitoring range of the associated infrared probe.
The photovoltaic monitoring unit judges whether the photovoltaic panel unit corresponding to the infrared probe is abnormal according to the temperature information acquired by the infrared probe, and if so, the serial number information of the fire control spray head corresponding to the infrared probe is included in a second trigger signal according to a pre-stored second associated information table; the photovoltaic monitoring unit outputs the second trigger signal to the fire control unit, and the fire control unit controls the corresponding fire control spray heads to work according to the serial number information in the second trigger signal.
It should be noted that, the serial number information of each of the RSD module, the infrared probe, and the fire-fighting nozzle corresponds to certain position information, and if a fire disaster or a fault occurs, a firefighter or a serviceman can find the specific position of the photovoltaic panel unit according to the serial number information of the RSD module, the infrared probe, or the fire-fighting nozzle corresponding to the abnormal photovoltaic panel unit, so as to further perform manual processing.
In a preferred embodiment, the photovoltaic monitoring unit outputs trigger signals to the RSD control unit and the fire control unit at preset time intervals, respectively, and whether the abnormal situation is eliminated is observed through short turn-off, if so, the fire control nozzle is not required to be used, and if not, the fire control nozzle is used for operation. For example, when the temperature detected by the 3 infrared probes exceeds a preset temperature threshold value and the maintenance time exceeds a set value, the photovoltaic panel units corresponding to the 3 infrared probes are judged to be abnormal, the photovoltaic monitoring unit sends the serial number information of the RSD modules corresponding to the 3 infrared probes to the RSD control unit, the RSD control unit turns off the corresponding RSD modules according to the serial number information so as to perform fire extinguishing treatment initially, and if the temperature detected by the 3 infrared probes in real time is lower than the preset temperature threshold value after 5 minutes, the serial number information of the fire fighting spray heads corresponding to the 3 infrared probes is removed from the second trigger signal sent to the fire fighting control unit.
Specifically, the infrared probes capable of acquiring the temperature are respectively aligned to different photovoltaic panel units, and the infrared probes at different positions can determine the heating conditions of the different photovoltaic panel units. The infrared probe may monitor one or more photovoltaic panel units, the monitoring range of which depends on the detectable angle of the probe.
The n infrared probes are respectively aligned to the nearby photovoltaic panel units, when the infrared probes monitor that the high-temperature radiation point exceeds the preset temperature threshold value, the high-temperature radiation of the point is rapidly analyzed in real time, when the temperature continuously rises and exceeds the highest threshold value, or the rising speed is higher than the set value, the occurrence of fire is judged, and the RSD module is immediately cut off. After the RSD module is cut off, if the temperature of the high-temperature radiation point is not reduced, the fire is not considered to be controlled, and then active fire control is triggered, a fire control nozzle close to the high-temperature radiation point on the fire control extinguishing device is opened, and fire control substances in the fire control extinguishing device are actively sprayed out to extinguish the fire. The fire extinguishing device may be an internal fire-fighting substance, such as water or fire-fighting foam, see fig. 10, or an internal pipe connected to an external hydrant. When the active fire control is started, the temperature is not reduced, and other fire control spray heads are adjusted to spray aiming at the radiation source, so that the fire control capability is improved. In order to expand the fire extinguishing range of a single fire-fighting nozzle, the fire-fighting nozzle can also adopt rotary spraying.
The string inverter provided by the invention adopts the architecture of the miniature string inverter, and has higher power density compared with the traditional miniature inverter, so that grid-connected reactive power regulation is realized; meanwhile, in an emergency state, the high voltage of the photovoltaic panel is rapidly cut off by means of the RSD module, the voltage is reduced below the safety voltage, the panel voltage which is as safe as micro-inverse can be realized, and the safety characteristics of low cost and traditional micro-inverse of the string inverter are achieved. And the series inverter can actively fire, further improve the safety protection and prevent damage from further expanding.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims (10)

1. The string inverter at the photovoltaic side is characterized by comprising a plurality of RSD modules, an RSD control unit, a Boost MPPT circuit and an inverter circuit, wherein the input ends of the RSD modules are used for being connected with the voltage output ends of the photovoltaic panel units, the output ends of the plurality of RSD modules are connected in series and then connected with the input ends of the Boost MPPT circuit, the output ends of the Boost MPPT circuit are connected with the input ends of the inverter circuit, and the output ends of the inverter circuit are used for being connected with an external alternating current power grid, an energy consumption load or an energy storage device;
the RSD control unit is electrically connected with the RSD modules, the RSD control unit is provided with a control interface, the control interface is used for receiving a turn-off instruction, the turn-off instruction comprises serial number information of the RSD modules needing to be turned off, and the RSD control unit turns off the corresponding RSD modules according to the serial number information in the turn-off instruction so as to disconnect voltage output of the corresponding photovoltaic panel units.
2. The string inverter according to claim 1, further comprising a dc arc detection module electrically connected to the control interface of the RSD control unit, and if the dc arc detection module detects that a dc arc phenomenon occurs in the detection range, outputting a scram instruction to the RSD control unit, where the scram instruction includes serial number information of all RSD modules in the detection range of the dc arc detection module, and the RSD control unit turns off the corresponding RSD module according to the serial number information in the scram instruction.
3. The string inverter of claim 1, wherein the input of one RSD module is connected to one photovoltaic panel unit or to a plurality of photovoltaic panel units simultaneously, the voltage at the input of each RSD module being less than a preset safety voltage.
4. The string inverter of claim 1, wherein the RSD module, RSD control unit, boost MPPT circuit, and inverter circuit are integrated.
5. A string inverter with an active turn-off function at a photovoltaic side, which is characterized by comprising a photovoltaic monitoring unit, a fire monitoring device and the string inverter as claimed in any one of claims 1-4, wherein the photovoltaic monitoring unit is arranged in the string inverter, the fire monitoring device comprises one or more infrared probes, the infrared probes are used for collecting temperature information of a photovoltaic panel unit, the photovoltaic panel units in different infrared probe monitoring ranges are partially identical or completely different, and all the infrared probes are electrically connected with the photovoltaic monitoring unit; the photovoltaic monitoring unit is pre-stored with a first association information table of the infrared probe and the RSD module;
the photovoltaic monitoring unit judges whether the photovoltaic panel unit corresponding to the infrared probe is abnormal according to the temperature information acquired by the infrared probe, and if so, the serial number information of the RSD module corresponding to the infrared probe is included in a first trigger signal according to a pre-stored first associated information table; the photovoltaic monitoring unit outputs the first trigger signal to the RSD control unit, and the RSD control unit controls the corresponding RSD module to turn off according to the sequence number information in the first trigger signal.
6. The string inverter according to claim 5,
if the temperature value acquired by one infrared probe is found to be greater than the preset temperature threshold value and is maintained for a period of time in real time, judging that the photovoltaic panel unit corresponding to the infrared probe is abnormal;
if the rising speed of the temperature value acquired by one infrared probe in a certain time period is larger than the preset speed value, judging that the photovoltaic panel unit corresponding to the infrared probe is abnormal.
7. The string inverter of claim 5, wherein one infrared probe is associated with one or more RSD modules, and wherein the one or more RSD modules correspond to photovoltaic panel units that include all of the photovoltaic panel units within the monitoring range of their associated infrared probe.
8. A fire protection system on a photovoltaic side, comprising a fire protection device, a fire protection control unit and a string inverter according to any one of claims 5-7, wherein the fire protection control unit is arranged in the string inverter, the monitoring range of the fire protection device and the fire protection range of the fire protection device both cover one or more photovoltaic panel units, and the photovoltaic panel units in the monitoring range of the fire protection device are partially or completely identical to the photovoltaic panel units in the fire protection range of the fire protection device;
the fire-fighting device comprises one or more fire-fighting spray heads, wherein the fire-fighting spray heads are used for extinguishing fire of the photovoltaic panel unit; the parts of the photovoltaic panel units in the fire extinguishing ranges of different fire-fighting nozzles are the same or completely different, and all the fire-fighting nozzles are electrically connected with the fire-fighting control unit; the photovoltaic monitoring unit is pre-stored with a second association information table of the infrared probe and the fire fighting nozzle;
the photovoltaic monitoring unit judges whether the photovoltaic panel unit corresponding to the infrared probe is abnormal according to the temperature information acquired by the infrared probe, and if so, the serial number information of the fire control spray head corresponding to the infrared probe is included in a second trigger signal according to a pre-stored second associated information table; the photovoltaic monitoring unit outputs the second trigger signal to the fire control unit, and the fire control unit controls the corresponding fire control spray heads to work according to the serial number information in the second trigger signal.
9. The fire protection system of claim 8, wherein one infrared probe is associated with one or more fire sprinklers, the one or more fire sprinklers having a total fire extinguishing range of photovoltaic panel cells including all of the photovoltaic panel cells within its associated infrared probe monitoring range.
10. The fire protection system of claim 8, wherein the photovoltaic monitoring unit outputs trigger signals to the RSD control unit and the fire control unit, respectively, sequentially at predetermined time intervals.
CN202211093463.8A 2022-09-08 2022-09-08 String inverter at photovoltaic side and fire protection system Pending CN116231840A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102654721B1 (en) * 2023-09-27 2024-04-04 ㈜티엠씨솔루션즈 Fire predictive maintenance system for solar modules equipped with arc fault detectors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102654721B1 (en) * 2023-09-27 2024-04-04 ㈜티엠씨솔루션즈 Fire predictive maintenance system for solar modules equipped with arc fault detectors

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