CN114709869A - Isolated photovoltaic grid-connected controller - Google Patents
Isolated photovoltaic grid-connected controller Download PDFInfo
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- CN114709869A CN114709869A CN202210351372.3A CN202210351372A CN114709869A CN 114709869 A CN114709869 A CN 114709869A CN 202210351372 A CN202210351372 A CN 202210351372A CN 114709869 A CN114709869 A CN 114709869A
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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
- 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
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- 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
- H02H3/26—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention provides an isolated photovoltaic grid-connected controller, which comprises a communication module, a control and protection module, an isolation module and a measurement module, wherein the communication module is used for communicating with the control and protection module; the measurement module is respectively connected with the photovoltaic system, the communication module and the control and protection module and is used for detecting parameters of the photovoltaic system and providing the parameters to the communication module and the control and protection module; the communication module is respectively connected with the photovoltaic system, the power grid system, the transformer area terminal and the control and protection module; the control and protection module is connected with the isolation module; the isolation module is respectively connected with the power grid system and the measurement module and used for disconnecting the photovoltaic system and the power grid system according to the control instruction. The technical scheme of the invention has an intelligent data acquisition function and an active protection function, realizes interconnection and intercommunication among the photovoltaic system, the power grid system and the transformer area fusion terminal, and real-time monitoring and group control and group regulation of the photovoltaic system, effectively ensures safe operation of the power grid system, and effectively avoids potential damage of the islanding effect of the photovoltaic system to line maintenance personnel.
Description
Technical Field
The invention relates to the technical field of power equipment for distributed photovoltaic power generation grid-connected control, in particular to an isolated photovoltaic grid-connected controller.
Background
With the development of green economy of energy conservation and emission reduction in recent years, the development and test points of photovoltaics are rapidly increased. A large number of distributed photovoltaics are simultaneously merged into a power distribution network, which means that the traditional unidirectional passive power distribution network evolves to an active network with interactive supply and demand, and all distributed photovoltaic systems must be uniformly controlled and scheduled. In addition, photovoltaic power generation is greatly influenced by illumination, so that the output voltage fluctuation is large, the harmonic hidden danger is large, the three-phase imbalance of a line is easily aggravated, and the quality problem of electric energy generated by grid connection can also pose a certain threat to a power distribution network. The existing photovoltaic grid-connected metering box mainly has a metering function, and in addition, the existing photovoltaic grid-connected metering box does not have a communication function with a user-side photovoltaic grid-connected inverter, so that control cannot be performed on accessed photovoltaic. The special controller for the photovoltaic grid-connected system, which can realize system and equipment state sensing and is convenient for operation, maintenance and large-range scheduling control, is urgently needed to be developed.
Disclosure of Invention
In order to solve the problems that the existing power grid system cannot control the accessed photovoltaic and is inconvenient in operation, maintenance, overhaul and scheduling control, the invention provides an isolated photovoltaic grid-connected controller, which comprises a communication module, a control and protection module, an isolation module and a measurement module; the measurement module is respectively connected with the photovoltaic system, the communication module and the control and protection module and is used for detecting parameters of the photovoltaic system and providing the parameters to the communication module and the control and protection module; the communication module is respectively connected with the photovoltaic system, the power grid system, the transformer area terminal and the control and protection module, and is used for establishing communication with the photovoltaic system, the power grid system, the transformer area terminal and the control and protection module, sharing information of the photovoltaic system and the power grid system to the control and protection module, simultaneously transmitting a control instruction of the transformer area terminal to the control and protection module, and reporting the information of the control and protection module to the transformer area terminal; the control and protection module is connected with the isolation module and used for issuing a control instruction to the isolation module according to the information and/or the parameters or transmitting the control instruction of the station area terminal to the isolation module; the isolation module is respectively connected with the power grid system and the measurement module and used for disconnecting the photovoltaic system and the power grid system according to the control instruction transmitted by the control and protection module.
Preferably, the isolation module comprises a circuit breaker and a disconnector connected in series; the circuit breaker is respectively connected with the measuring module and the control and protection module and is used for disconnecting the measuring module and the isolating switch according to a control instruction; the isolating switch is connected with a power grid system.
Preferably, the control and protection module comprises a first communication port unit and a control unit which are connected with each other; the first communication port unit is respectively connected with the communication module, the measurement module and the circuit breaker; and the control unit issues an instruction to a photovoltaic system or the circuit breaker according to the data collected by the first communication port unit.
Preferably, the measuring module comprises a second communication port unit and a detecting unit which are connected with each other; the second communication port unit is respectively connected with the first communication port unit and the communication module; the detection unit is connected with the photovoltaic system and used for detecting parameters of the photovoltaic system.
Preferably, the communication module comprises a protocol conversion unit and a third communication port unit which are connected with each other; and the third communication port unit is respectively connected with the photovoltaic system, the power grid system, the transformer area terminal, the first communication port unit and the second communication port unit.
Preferably, the detection unit comprises at least one of a voltage transformer, a current transformer, a residual current measuring device and an arc sensing device.
Preferably, the detection unit further comprises at least one of a temperature sensor, a humidity sensor, a smoke sensor and a water sensor.
Preferably, the device also comprises a box body; the communication module, the isolation module, the measurement module and the control and protection module are arranged in the box body.
Preferably, the box body comprises a window, and an operation panel is embedded in the window.
Preferably, the operation panel includes a key and an indicator connected to each other, and the key is connected to the circuit breaker.
Compared with the prior art, the invention has the following beneficial effects:
according to the isolated photovoltaic grid-connected controller provided by the invention, the communication module, the control and protection module, the isolation module and the measurement module are arranged, so that the control system has an intelligent data acquisition function and an active protection function, the interconnection and intercommunication among the photovoltaic system, the power grid system and the station area terminal, the real-time monitoring and the group control and group regulation of the photovoltaic system are realized, and the safe operation of the power grid system is effectively ensured; the isolation fracture between the photovoltaic system and the power grid system is provided through the isolation module, and potential damage of the photovoltaic system island effect to line maintenance personnel is effectively avoided.
Drawings
Fig. 1 is a schematic diagram of an isolated photovoltaic grid-connected controller according to the present invention;
fig. 2 is a schematic diagram of a distributed photovoltaic system in which the isolated photovoltaic grid-connected controller provided in embodiment 1 of the present invention is applied in a "full-grid-connection" mode;
fig. 3 is a schematic diagram of a distributed photovoltaic system in which the isolated photovoltaic grid-connected controller provided in embodiment 2 of the present invention is applied in a "spontaneous self-use, remaining power grid-connection" mode.
Detailed Description
The invention discloses an isolated photovoltaic grid-connected controller, which realizes interconnection and intercommunication among a photovoltaic system, a power grid system and a transformer area fusion terminal and effectively ensures the safe operation of the power grid system by arranging a communication module, a control and protection module, an isolation module and a measurement module.
Example 1:
at present, two grid connection modes of a low-voltage distributed photovoltaic system exist, one mode is a full-rate grid connection scheme, and the other mode is a scheme of self-generation and self-use and surplus power grid connection. In this embodiment, an isolated photovoltaic grid-connected controller is applied to a distributed photovoltaic system in a "full-rated internet access" mode, and the controller is installed between a grid-connected metering box of a user and a 380V line access point, as shown in fig. 2.
As shown in fig. 1, the isolated photovoltaic grid-connected controller includes: the system comprises a communication module, a control and protection module, an isolation module and a measurement module; the measurement module is respectively connected with the photovoltaic system, the communication module and the control and protection module and is used for detecting parameters of the photovoltaic system and providing the parameters to the communication module and the control and protection module; the communication module is respectively connected with the photovoltaic system, the power grid system, the transformer area terminal and the control and protection module, is used for converting communication protocols, provides data and parameters of the photovoltaic system and the power grid system to the transformer area terminal or the control and protection module, simultaneously transmits a control instruction of the transformer area terminal to the control and protection module, and reports the data of the control and protection module to the transformer area terminal; the control and protection module is connected with the isolation module and used for analyzing according to data of the photovoltaic system and the power grid system, issuing a control instruction to the photovoltaic system, analyzing according to the parameters, issuing the control instruction to the isolation module and transmitting the control instruction of the platform area terminal to the isolation module; the isolation module is respectively connected with the power grid system and the measurement module and used for disconnecting the photovoltaic system and the power grid system according to the control instruction.
The measuring module comprises a second communication port unit and a detecting unit which are connected with each other, and the detecting unit is connected with the photovoltaic grid-connected metering box. The detection unit comprises voltage, current, power, electric quantity and harmonic measurement devices, such as a voltage transformer, a current transformer, a power measurement instrument, an electric quantity measurement instrument and a harmonic measurement instrument, and also comprises sensors related to environment monitoring, such as a temperature sensor, a humidity sensor, a water immersion sensor, a smoke sensor and the like, and the environment temperature, the temperature of a wiring terminal, the environment humidity, the water immersion state, the environment smoke and the like are monitored. The detection unit can also be provided with a residual current measuring device and an arc sensing device which are respectively used for monitoring residual current and direct current arc in the circuit. The second communication port unit is respectively in wireless connection with the communication module and the control and protection module and is used for providing the data monitored by the detection unit for the communication module and the control and protection module. The second communication port unit can be connected with the communication module and the control and protection module through wires.
The communication module comprises a protocol conversion unit and a third communication port unit which are connected with each other. The protocol conversion unit has a protocol conversion function, so that the third communication port unit can adopt various communication modes such as RS485, HPLC and Bluetooth and support corresponding communication protocols such as DL/T645, DL/T698, Modbus-RTU and the like. The third communication port unit is respectively in wireless connection with the photovoltaic inverter and the photovoltaic grid-connected metering box, is responsible for collecting data of the photovoltaic inverter and the photovoltaic grid-connected metering box in real time, and is in wireless connection with the station area terminal. Meanwhile, the third communication port unit is wirelessly connected with the control and protection module and the second communication unit, and transmits the parameters of the measurement module to the control and protection module. The third communication port unit can be connected with the photovoltaic inverter, the photovoltaic grid-connected metering box, the station area terminal, the control protection module and the second communication unit through wires.
The third communication port unit can be respectively in real-time two-way communication with the photovoltaic grid-connected metering box, the photovoltaic inverter and the platform area terminal, parameters of the photovoltaic inverter are transmitted to the platform area terminal, commands of the platform area terminal are issued to the photovoltaic inverter, the flexibility of photovoltaic power generation capacity of a power grid background is controllable and adjustable, the real-time communication and group control group adjustment of a power grid system and the photovoltaic system are achieved, interaction and comparison of photovoltaic grid-connected point data and the photovoltaic grid-connected metering box are achieved, state perception of power equipment is achieved, transmission of control commands is achieved, and power outage and restoration time is reported actively. The third communication port unit can be in two-way communication with various photovoltaic inverters, in the embodiment, the third communication port unit is in communication with the photovoltaic grid-connected metering box and the photovoltaic inverters through RS485, and the third communication port unit is in communication with the platform area terminal through HPLC.
The third communication port unit can also perform two-way communication with the control and protection module, and when the power grid system fails, a remote instruction of the station area terminal can be sent to the control and protection module to control the grid-connected state of the photovoltaic system.
The isolated photovoltaic grid-connected controller is used as key protection and control equipment of a photovoltaic grid-connected system, has an intelligent data acquisition function, is provided with a communication protocol conversion function in a communication module, realizes interconnection and intercommunication among a photovoltaic inverter, a photovoltaic grid-connected metering box, a controller and a power grid area fusion terminal of a user, and realizes the functions of real-time monitoring and group control and group regulation of the power grid system on the photovoltaic system.
The platform district terminal can select to use intelligent fusion terminal, and platform district intelligent fusion terminal can be connected with electric power data monitored control system, realizes unified monitoring and management to photovoltaic system's operational information and user power consumption information, can also carry out remote control to photovoltaic power generation data, in time masters distributed photovoltaic power plant's operational aspect, greatly simplifies photovoltaic power plant's operation and maintenance work.
The control and protection module comprises a first communication port unit and a control unit which are connected with each other, wherein the first communication port unit can receive data collected by a third communication port unit and can also directly receive data of a second communication port unit. The data of the first communication port unit can also be reported to the terminal of the transformer area through the third communication port unit. The first communication port unit is also in bidirectional communication with the isolation module through wire or wireless, issues the instruction of the control unit to the isolation module, and feeds back the parameter of the isolation module to the control unit or the station area terminal. The control unit is a center for data analysis and calculation, can select an intelligent control mode, analyzes and calculates the data received by the first communication port unit, performs intelligent logic judgment according to conditions, gives a control instruction and realizes on-site protection. When the power grid system has a fault, the control and protection module can also directly receive a control instruction of the platform area terminal to control the grid-connected state of the photovoltaic system.
The control and protection module can also analyze and judge the undervoltage parameters monitored by the measurement module, provide an undervoltage delay function and be used for tripping under the undervoltage or no-voltage condition, and can also analyze and judge the overvoltage and overload parameters monitored by the measurement module, so as to control the opening of the circuit breaker in time and prevent fire.
The isolated photovoltaic grid-connected controller can also be provided with a fault early warning function of residual current and an early warning function of arc faults. After a large amount of distributed photovoltaic grid-connected branches are connected, smooth and pulsating direct current and high-frequency alternating current components can be injected into a power grid, when the photovoltaic grid-connected branches leak electricity, the traditional AC type leakage protection equipment cannot identify direct current and high-frequency alternating current leakage, even the protection characteristic of the existing AC type leakage is influenced, and the risk of personal electric shock and casualty is greatly increased. When the measuring module monitors the residual current meeting the set parameters, the parameters of the residual current are transmitted to the control and protection module, the control and protection module controls the circuit breaker to open the brake through analysis, and the system issues electric leakage early warning. Direct current fault arcs are important factors threatening the safe operation of photovoltaic systems. Most of existing photovoltaic grid-connected circuit breakers have no arc monitoring function, and the existing photovoltaic grid-connected circuit breakers cannot avoid damage of direct-current arcs, so that electric fires and equipment damage are caused. When the measuring module monitors an arc fault, the control and protection module operates the breaker to open the brake, and the communication module issues an arc fault alarm to the system.
The isolation module comprises a circuit breaker and an isolation switch which are connected in series. The breaker is attached with an on-off brake operating mechanism, and the on-off brake operating mechanism is connected with a first communication port unit of the control and protection module and used for receiving an electric signal instruction of the control and protection module. After receiving the data of the measurement module, the control and protection module can control the opening and closing of the circuit breaker through the opening and closing operation mechanism according to condition judgment, so that on-site protection is realized. When the power grid system has a fault, the platform area terminal can also remotely send a control instruction to the control and protection module through the communication module, and the control and protection module operates the switching-on and switching-off operation mechanism of the circuit breaker to control the grid-connected state of the photovoltaic system. When the isolating switch is used for line maintenance, a clear isolating fracture between the photovoltaic system and the power grid system is provided, and the safety maintenance of operators is facilitated. The circuit breaker and the isolation are respectively provided with two wiring terminals, the two wiring terminals of the circuit breaker are respectively connected with one wiring terminal of the measuring module and one wiring terminal of the isolation switch, and the other wiring terminal of the isolation switch is connected with an access point of a power grid system.
The circuit breaker can realize the active protection function of the power grid system, and can effectively ensure the safe operation of the power grid system as a firewall between the power grid system and a user photovoltaic system. The isolating switch provides an isolating fracture between the photovoltaic system and the power grid system, and potential damage of an island effect of the photovoltaic system to line maintenance personnel is effectively avoided under the condition of power failure of the power grid system.
Each module of the invention can adopt a live pluggable design so as to realize timely replacement of a fault module, and plug and play.
The arrangement of the isolation module improves the active protection of the power grid of the controller, and effectively prevents potential damage of an island effect of the photovoltaic system to power grid line maintainers. According to the technical specification of photovoltaic grid-connected inverters of NB/T32004, photovoltaic inverters connected to a low-voltage power distribution network generally need to have the capability of rapidly monitoring an island and immediately disconnecting from a power grid, and the anti-island protection action time is not more than 2 s. After the photovoltaic inverter trips, if the voltage and the frequency of the power grid side are recovered to be normal, the photovoltaic inverter recovers to be connected to the power grid after an adjustable delay time (20 s-5 min). At present, when a grid is powered off, an isolated island is passively detected by the change of voltage and frequency of an output end of an inverter. However, when the output power of the photovoltaic power generation is balanced with the power of the local load, the passive detection method loses the island effect detection capability, the distributed photovoltaic can continue to supply power to the surrounding load to generate a photovoltaic island operation phenomenon, personal injury of line maintenance personnel can be caused, and the safe operation of the power distribution network faces greater challenges. The device is matched with a power grid area fusion terminal to collect photovoltaic system data in real time, so that the collection of photovoltaic power generation data is increased, when the power grid is in local outage, after the fusion terminal collects the photovoltaic power generation data, the connection between the photovoltaic system and the power grid system is cut off through active control of a controller, a breaker is opened, and a line maintenance worker firstly separates an isolation switch and then carries out line maintenance, so that the safety of the line maintenance worker is ensured; and after the maintenance is finished, firstly closing the disconnecting link and then closing the breaker, sensing the closing of the controller by the inverter through the communication module, automatically starting the inverter according to the logic judgment of grid connection recovery, and recovering the grid connection of the photovoltaic system.
The isolated photovoltaic grid-connected controller adopts a modular design, and solves the problem that the service lives of electronic equipment and mechanical equipment are different. Because the service life of the electronic product is far shorter than that of the mechanical part, the fault module can be replaced in time by the design of the separated independent module, and the cost in the whole life cycle of the product is greatly reduced. Or a part of module integrated design can be adopted, for example, the communication module and the control and protection module can adopt integrated design.
Compared with the existing photovoltaic grid-connected equipment, the isolated photovoltaic grid-connected controller has the outstanding characteristics that data on a photovoltaic inverter with user property rights can be shared into a power grid system in an internal and external grid safe isolation mode, the regulation and control rights of the photovoltaic inverter are shared to the power grid system to realize a control function, and meanwhile, the power grid system is matched with a platform area terminal to realize the group regulation and group control of the photovoltaic inverter in the platform area, so that the safety and reliability of the power grid system are ensured under the condition of large-range photovoltaic grid connection.
Example 2:
at present, two grid connection modes of a low-voltage distributed photovoltaic system exist, one mode is a full-rate grid connection scheme, and the other mode is a scheme of self-generation and self-use and surplus power grid connection. The embodiment is a distributed photovoltaic system applying an isolated photovoltaic grid-connected controller to a 'self-generation self-use and residual electricity grid-connection' mode. The isolated photovoltaic grid-connected controller is installed between a grid-connected metering box and a user metering box, and the user metering box is a device for collecting the user residual power grid-connected quantity, as shown in fig. 3.
As shown in fig. 1, the isolated photovoltaic grid-connected controller of the present embodiment includes: the device comprises a communication module, a control and protection module, an isolation module and a measurement module; the measurement module is respectively connected with the photovoltaic system, the communication module and the control and protection module and is used for detecting parameters of the photovoltaic system and providing the parameters to the communication module and the control and protection module; the communication module is respectively connected with the photovoltaic system, the power grid system, the transformer area terminal and the control and protection module, is used for converting communication protocols, provides data and parameters of the photovoltaic system and the power grid system to the transformer area terminal or the control and protection module, simultaneously transmits a control instruction of the transformer area terminal to the control and protection module, and reports the data of the control and protection module to the transformer area terminal; the control and protection module is connected with the isolation module and used for analyzing according to data of the photovoltaic system and the power grid system, issuing a control instruction to the photovoltaic system, analyzing according to the parameters, issuing the control instruction to the isolation module and transmitting the control instruction of the platform area terminal to the isolation module; the isolation module is respectively connected with the power grid system and the measurement module and used for disconnecting the photovoltaic system and the power grid system according to the control instruction.
The measuring module comprises a second communication port unit and a detecting unit which are connected with each other, and the detecting unit is connected with the photovoltaic grid-connected metering box. The second communication port unit is respectively in wireless connection with the communication module and the control and protection module and is used for providing the data monitored by the detection unit for the communication module and the control and protection module.
The communication module comprises a protocol conversion unit and a third communication port unit which are connected with each other. The protocol conversion unit has a protocol conversion function, so that the third communication port unit can adopt various communication modes such as RS485, HPLC and Bluetooth and support corresponding communication protocols such as DL/T645, DL/T698, Modbus-RTU and the like. The third communication port unit is respectively in wireless connection with the photovoltaic inverter, the photovoltaic grid-connected metering box and the user metering box, is responsible for acquiring data of the photovoltaic inverter, the photovoltaic grid-connected metering box and the user metering box, and is in wireless connection with the station area terminal. Meanwhile, the third communication port unit is wirelessly connected with the control and protection module and the second communication unit, and transmits the parameters of the measurement module to the control and protection module. The third communication port unit can be connected with the photovoltaic inverter, the photovoltaic grid-connected metering box, the user metering box, the station area terminal, the control protection module and the second communication unit through wires.
The third communication port unit can be respectively in real-time two-way communication with the photovoltaic grid-connected metering box, the photovoltaic inverter, the user metering box and the station terminal, parameters of the photovoltaic inverter are transmitted to the station terminal, commands of the station terminal are issued to the photovoltaic inverter, the flexibility of the photovoltaic power generation amount of a power grid background is controllable and adjustable, the real-time communication between a power grid system and the photovoltaic system is achieved, group control and group adjustment are achieved, the interaction and comparison between photovoltaic grid-connected point data and the photovoltaic grid-connected metering box are achieved, the state sensing of electric power equipment, the transmission of control commands and the active reporting of power failure and recovery time are achieved. The third communication port unit can be in two-way communication with various photovoltaic inverters, in the embodiment, the third communication port unit is in communication with the photovoltaic grid-connected metering box and the photovoltaic inverters through RS485, the third communication port unit is in communication with the station area terminal through HPLC, and the third communication port unit is in communication with the user metering box through RS 485.
The third communication port unit can also perform two-way communication with the control and protection module, and when the power grid system fails, a remote instruction of the station area terminal can be sent to the control and protection module to control the grid-connected state of the photovoltaic system.
The control and protection module comprises a first communication port unit and a control unit which are connected with each other, wherein the first communication port unit can receive data collected by a third communication port unit and can also directly receive data of a second communication port unit. The data of the first communication port unit can also be reported to the terminal of the transformer area through the third communication port unit. The first communication port unit is also in bidirectional communication with the isolation module through wire or wireless, issues the instruction of the control unit to the isolation module, and feeds back the parameter of the isolation module to the control unit or the station area terminal. The control unit is a center for data analysis and calculation, and performs intelligent logic judgment according to conditions by analyzing and calculating data received by the first communication port unit, and gives a control instruction to realize on-site protection. When the power grid system has a fault, the control and protection module can also directly receive a control instruction of the platform area terminal to control the grid-connected state of the photovoltaic system.
The isolation module comprises a circuit breaker and an isolation switch which are connected in series. The breaker is attached with an on-off brake operating mechanism, and the on-off brake operating mechanism is connected with a first communication port unit of the control and protection module and used for receiving an electric signal instruction of the control and protection module. After receiving the data of the measurement module, the control and protection module can control the opening and closing of the circuit breaker through the opening and closing operation mechanism according to condition judgment, so that on-site protection is realized. When the power grid system has a fault, the platform area terminal can also remotely send a control instruction to the control and protection module through the communication module, and the control and protection module operates the switching-on and switching-off operation mechanism of the circuit breaker to control the grid-connected state of the photovoltaic system. When the isolating switch is used for line maintenance, a clear isolating fracture between the photovoltaic system and the power grid system is provided, and the safety maintenance of operators is facilitated. The circuit breaker and the isolation are respectively provided with two wiring terminals, the two wiring terminals of the circuit breaker are respectively connected with one wiring terminal of the measuring module and one wiring terminal of the isolation switch, and the other wiring terminal of the isolation switch is connected with an access point of a power grid system.
The isolated photovoltaic grid-connected controller also comprises a box body, wherein the box body is used for placing the communication module, the isolation module, the measurement module and the control and protection module in the box body so as to adapt to various outdoor severe environments. The box openly sets up visual window, and the window is embedded to have operating panel, and the equipment state and the isolation fracture state in the convenient observation case under the condition of not unpacking. Operating panel is equipped with interconnect's button and indicator, and the button is connected with the separating brake operation structure that closes of circuit breaker for manual control separating brake operating device, the local operation photovoltaic system of mainly used circuit maintainer is incorporated into the power networks, prevents that electric wire netting platform district terminal maloperation from merging photovoltaic system into when maintainer circuit overhauls, causes the threat to circuit maintainer safety. The indicator can be a status indicating accessory or a status indicating lamp and is used for indicating the opening and closing states of the circuit breaker.
The operation panel can also be provided with manual and remote operation options. When the local manual operation is selected, the switching-on and switching-off operation of the circuit breaker can be realized through the keys on the panel; when remote operation is selected, the communication module can send an operation instruction, and the control and protection module controls the opening and closing of the circuit breaker.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (10)
1. An isolated photovoltaic grid-connected controller is characterized by comprising a communication module, a control and protection module, an isolation module and a measurement module;
the measurement module is respectively connected with the photovoltaic system, the communication module and the control and protection module and is used for detecting parameters of the photovoltaic system and providing the parameters to the communication module and the control and protection module;
the communication module is respectively connected with the photovoltaic system, the power grid system, the transformer area terminal and the control and protection module, and is used for establishing communication with the photovoltaic system, the power grid system, the transformer area terminal and the control and protection module, sharing information of the photovoltaic system and the power grid system to the control and protection module, simultaneously transmitting a control instruction of the transformer area terminal to the control and protection module, and reporting the information of the control and protection module to the transformer area terminal;
the control and protection module is connected with the isolation module and is used for issuing a control instruction to the isolation module according to the information and/or the parameters or transmitting the control instruction of the transformer area terminal to the isolation module;
the isolation module is respectively connected with the power grid system and the measurement module and used for disconnecting the photovoltaic system and the power grid system according to the control instruction transmitted by the control and protection module.
2. The isolated photovoltaic grid-connected controller according to claim 1, wherein the isolation module comprises a circuit breaker and a disconnector in series; the circuit breaker is respectively connected with the measuring module and the control and protection module and is used for disconnecting the measuring module and the isolating switch according to a control instruction; the isolating switch is connected with a power grid system.
3. The isolated photovoltaic grid-connected controller according to claim 2, wherein the control and protection module comprises a first communication port unit and a control unit which are connected with each other; the first communication port unit is respectively connected with the communication module, the measurement module and the circuit breaker; and the control unit issues an instruction to a photovoltaic system or the circuit breaker according to the data collected by the first communication port unit.
4. The isolated photovoltaic grid-connected controller according to claim 3, wherein the measurement module comprises a second communication port unit and a detection unit connected to each other; the second communication port unit is respectively connected with the first communication port unit and the communication module; the detection unit is connected with the photovoltaic system and used for detecting parameters of the photovoltaic system.
5. The isolated photovoltaic grid-connected controller according to claim 4, wherein the communication module comprises a protocol conversion unit and a third communication port unit connected to each other; and the third communication port unit is respectively connected with the photovoltaic system, the power grid system, the transformer area terminal, the first communication port unit and the second communication port unit.
6. The isolated photovoltaic grid-connected controller according to claim 4, wherein the detection unit comprises at least one of a voltage transformer, a current transformer, a residual current measurement device and an arc sensing device.
7. The isolated photovoltaic grid-connected controller according to claim 6, wherein the detection unit further comprises at least one of a temperature sensor, a humidity sensor, a smoke sensor, and a water sensor.
8. The isolated photovoltaic grid-connected controller according to claim 2, further comprising a box; the communication module, the isolation module, the measurement module and the control and protection module are arranged in the box body.
9. The isolated photovoltaic grid-connected controller according to claim 8, wherein the box body comprises a window, and an operation panel is embedded in the window.
10. The isolated photovoltaic grid-connected controller according to claim 9, wherein the operating panel comprises interconnected buttons and indicators, the buttons being connected to the circuit breakers.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210351372.3A CN114709869A (en) | 2022-04-02 | 2022-04-02 | Isolated photovoltaic grid-connected controller |
| CN202222337769.5U CN218888153U (en) | 2022-04-02 | 2022-09-02 | Photovoltaic grid-connected control and isolation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210351372.3A CN114709869A (en) | 2022-04-02 | 2022-04-02 | Isolated photovoltaic grid-connected controller |
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| CN114709869A true CN114709869A (en) | 2022-07-05 |
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| CN202210351372.3A Pending CN114709869A (en) | 2022-04-02 | 2022-04-02 | Isolated photovoltaic grid-connected controller |
| CN202222337769.5U Active CN218888153U (en) | 2022-04-02 | 2022-09-02 | Photovoltaic grid-connected control and isolation device |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222337769.5U Active CN218888153U (en) | 2022-04-02 | 2022-09-02 | Photovoltaic grid-connected control and isolation device |
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| US11955782B1 (en) | 2022-11-01 | 2024-04-09 | Typhon Technology Solutions (U.S.), Llc | System and method for fracturing of underground formations using electric grid power |
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| CN218888153U (en) | 2023-04-18 |
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Application publication date: 20220705 |