CN113394811A - Method and related device for performing synchronous phase locking through controller local area network - Google Patents
Method and related device for performing synchronous phase locking through controller local area network Download PDFInfo
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- CN113394811A CN113394811A CN202110837375.3A CN202110837375A CN113394811A CN 113394811 A CN113394811 A CN 113394811A CN 202110837375 A CN202110837375 A CN 202110837375A CN 113394811 A CN113394811 A CN 113394811A
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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
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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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
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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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- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
- Y04S10/123—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/14—Energy storage units
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention is suitable for the technical field of photovoltaic energy storage system control, provides a method for carrying out synchronous phase locking through a controller local area network and a related device, and aims to solve the technical problem that the phase locking between sub-photovoltaic energy storage systems is not accurate enough when the photovoltaic energy storage systems carry out synchronous phase locking. When the method of the embodiment of the application is applied to the sub-photovoltaic energy storage system as the host, the method comprises the following steps: monitoring the connection state of the photovoltaic energy storage system and a power grid, wherein the connection state comprises grid connection and grid disconnection; if the connection state is grid connection, acquiring a mains supply zero-crossing signal of the power grid, and triggering the mains supply zero-crossing signal to send a synchronization signal to the slave machine, wherein the synchronization signal is a network signal and is transmitted through a controller local area network; if the connection state is off-network, acquiring a host zero-crossing signal of the host, and triggering the host zero-crossing signal to send the synchronous signal to the slave; and carrying out synchronous phase locking with the slave machine according to the synchronous signal.
Description
Technical Field
The invention belongs to the technical field of photovoltaic energy storage system control, and particularly relates to a method for performing synchronous phase locking through a controller local area network and a related device.
Background
As is well known, the photovoltaic power generation industry is greatly influenced by natural environments, especially by natural factors such as sunshine duration and ambient temperature. In a proper natural environment, a plurality of photovoltaic energy storage systems are usually established in a centralized manner to improve the generated energy of the solar photovoltaic power generation matrix and the stored energy of the storage battery, so that the favorable natural environment is fully utilized to obtain more electric quantity. When a plurality of photovoltaic energy storage systems are respectively used as sub-photovoltaic energy storage systems to be connected in parallel to form a photovoltaic energy storage system, each sub-photovoltaic energy storage system needs to be managed uniformly, so that the external alternating current output of each sub-photovoltaic energy storage system is kept in the same phase when being connected to the grid or disconnected from the grid, and the requirements of the power supplies of most current loads are met.
For a photovoltaic energy storage system with a plurality of sub photovoltaic energy storage systems, when the photovoltaic energy storage system supplies power to a power grid in a grid-connected state, the phase of alternating current output to the power grid by each sub photovoltaic energy storage system needs to be ensured to be consistent with the phase of the power grid. In the prior art, each sub-photovoltaic energy storage system automatically monitors the phase of a power grid, and performs phase locking by adopting a hardware zero-crossing signal, then all the sub-photovoltaic energy storage systems perform phase locking on the power grid respectively, and since the sub-photovoltaic energy storage systems have different monitoring precision on the power grid respectively, it is likely that uniform phase connection between the sub-photovoltaic energy storage systems and the power grid cannot be realized, so that energy waste and potential safety hazards also exist; in addition, when the system is off-grid to provide alternating current output for a load, all the sub-photovoltaic energy storage systems listen to one of the hardware zero-crossing signals of the sub-photovoltaic energy storage system set as the host for phase locking, the hardware zero-crossing signal is generated when a monitoring circuit of the host automatically detects the zero-crossing signal of the power grid and is directly sent to all the sub-photovoltaic energy storage systems, and therefore the hardware zero-crossing signal is directly used for transmission, the signal stability is poor, the signal transmission is easily interfered, and further the problem that unified phase locking cannot be achieved among the sub-photovoltaic energy storage systems is easily caused.
That is to say, there is a great need in the prior art for a technical solution for realizing accurate phase locking of a photovoltaic energy storage system formed by connecting a plurality of sub-photovoltaic energy storage systems in parallel.
Disclosure of Invention
An object of the embodiments of the present application is to provide a method and a related apparatus for performing phase lock synchronization through a controller area network, which aim to solve the technical problem that in the prior art, when a plurality of sub-photovoltaic energy storage systems are combined in parallel to form a photovoltaic energy storage system for phase lock, the phase lock of each sub-photovoltaic energy storage system is not accurate and uniform enough.
The present application provides a method for performing a phase lock through a controller area network, which is applied to a master in a photovoltaic energy storage system including the master and a slave, and includes:
monitoring the connection state of the photovoltaic energy storage system and a power grid, wherein the connection state comprises grid connection and grid disconnection;
if the connection state is grid connection, acquiring a mains supply zero-crossing signal of the power grid, and triggering the mains supply zero-crossing signal to send a synchronization signal to the slave machine, wherein the synchronization signal is a network signal and is transmitted through a controller local area network;
if the connection state is off-network, acquiring a host zero-crossing signal of the host, and triggering the host zero-crossing signal to send the synchronous signal to the slave;
and carrying out synchronous phase locking with the slave machine according to the synchronous signal.
Optionally, the sending the synchronization signal to the slave includes:
periodically transmitting the synchronization signal to the slave;
the performing the synchronous phase locking with the slave machine according to the synchronous signal comprises:
and periodically carrying out synchronous phase locking with the slave machine according to the synchronous signal.
Optionally, after performing a genlock with the slave according to the synchronization signal, the method further includes:
receiving the current state information of the slave;
generating control information for the slave according to the state information, wherein the control information is used for controlling the charging power or the discharging power of the slave;
sending the control information to the slave machine so that the slave machine executes the control information.
The second aspect of the present application provides a genlock method, which is applied to a slave in a photovoltaic energy storage system composed of a master and a slave, and includes:
receiving a synchronous signal sent by the host, wherein the synchronous signal is a network signal and is transmitted through a controller local area network;
and performing synchronous phase locking with the host according to the synchronous signal.
Optionally, the receiving the synchronization signal sent by the host includes:
periodically receiving the synchronization signal sent by the host;
the performing the genlock with the host according to the synchronization signal includes:
and carrying out periodic synchronous phase locking with the host according to the synchronous signal.
Optionally, the performing the genlock with the host according to the synchronization signal includes:
calculating to obtain a current phase according to the synchronous signal and a preset compensation time length, wherein the preset compensation time length is a time length required by the synchronous signal to be transmitted from the host to the slave;
and performing synchronous phase locking with the host by using the current phase.
Optionally, after performing a genlock with the host according to the synchronization signal, the method further includes:
sending current state information to the master machine so that the master machine generates and replies control information to the slave machine according to the state information, wherein the control information is used for controlling the charging power or the discharging power of the slave machine;
receiving the control information sent by the host;
and executing the control information.
The third aspect of the present application provides a genlock apparatus, applied to a master in a photovoltaic energy storage system including the master and a slave, including:
the monitoring unit is used for monitoring the connection state of the photovoltaic energy storage system and a power grid, wherein the connection state comprises grid connection and grid disconnection;
the first acquisition unit is used for acquiring a mains supply zero-crossing signal of the power grid if the connection state is grid connection;
the first sending unit is used for sending a synchronization signal to the slave machine by triggering of the commercial power zero-crossing signal, wherein the synchronization signal is a network signal and is transmitted through a controller local area network;
the second acquisition unit is used for acquiring a host zero-crossing signal of the host if the connection state is off-grid;
a second sending unit, configured to trigger sending the synchronization signal to the slave by the master zero crossing signal,
and the phase locking unit is used for carrying out synchronous phase locking with the slave machine according to the synchronous signal.
Optionally, when the first sending unit or the second sending unit sends the synchronization signal to the slave, the method is specifically configured to:
periodically transmitting the synchronization signal to the slave;
the performing the synchronous phase locking with the slave machine according to the synchronous signal comprises:
and periodically carrying out synchronous phase locking with the slave machine according to the synchronous signal.
Optionally, the genlock apparatus further includes:
the receiving unit is used for receiving the current state information of the slave;
the generating unit is used for generating control information for the slave according to the state information, and the control information is used for controlling the charging power or the discharging power of the slave;
a third sending unit, configured to send the control information to the slave, so that the slave executes the control information.
The fourth aspect of the present application provides another genlocking device, which is applied to a slave in a photovoltaic energy storage system including a master and the slave, and includes:
the first receiving unit is used for receiving a synchronous signal sent by the host, wherein the synchronous signal is a network signal and is transmitted through a controller local area network;
and the phase locking unit is used for carrying out synchronous phase locking with the host according to the synchronous signal.
Optionally, when the sending unit receives the synchronization signal sent by the host, the sending unit is specifically configured to:
periodically receiving the synchronization signal sent by the host;
when the phase locking unit performs synchronous phase locking with the host according to the synchronous signal, the phase locking unit is specifically configured to:
and carrying out periodic synchronous phase locking with the host according to the synchronous signal.
Optionally, when the phase locking unit performs synchronous phase locking with the host according to the synchronization signal, the phase locking unit is specifically configured to:
calculating to obtain a current phase according to the synchronous signal and a preset compensation time length, wherein the preset compensation time length is a time length required by the synchronous signal to be transmitted from the host to the slave;
and performing synchronous phase locking with the host by using the current phase.
Optionally, the genlock apparatus further includes:
a sending unit, configured to send current state information to the master, so that the master generates and replies control information for the slave according to the state information, where the control information is used to control charging power or discharging power of the slave;
a second receiving unit, configured to receive the control information sent by the host;
an execution unit configured to execute the control information.
A fifth aspect of the present application provides a computer device comprising:
the system comprises a processor, a memory, a bus, an input/output interface and a network interface;
the processor is connected with the memory, the input/output interface and the network interface through a bus;
the memory stores a program;
the processor, when executing the program stored in the memory, implements the method of any of the preceding first or second aspects.
A sixth aspect of the present application provides a computer storage medium having stored therein instructions that, when executed on a computer, cause the computer to perform the method of any of the preceding first or second aspects.
A seventh aspect of the present application provides a computer program product which, when executed on a computer, causes the computer to perform the method as set forth in the preceding first or second aspect.
According to the technical scheme, the embodiment of the application has the following advantages:
when the synchronous phase locking method of the embodiment of the application is applied to the host machine in the photovoltaic energy storage system consisting of the host machine and the slave machine, the host machine is required to monitor the connection state of the photovoltaic energy storage system and the power grid, if the connection state is grid connection, the photovoltaic energy storage system is indicated to be connected with the power grid, when the photovoltaic energy storage system supplies power to the power grid at the moment, as the power grid in China is alternating current (generally, sinusoidal alternating current with the voltage of 220V and the frequency of 50 HZ), the photovoltaic energy storage system needs to carry out phase locking according to the phase of the alternating current of the power grid so as to ensure that the phase of the alternating current output from the photovoltaic energy storage system and the power grid is within an acceptable range (generally, the phase difference between the alternating current output from the photovoltaic energy storage system and the power grid is not more than 1 degree), then, the host and the slave are synchronously phase-locked together according to the synchronous signals, so that the host and the slave which are used as the sub-photovoltaic energy storage systems in the photovoltaic energy storage system are synchronously phase-locked according to the same synchronous signal, and the phase locking of each sub-photovoltaic energy storage system in the photovoltaic energy storage system is more accurately synchronized; if the host monitors that the connection state of the photovoltaic energy storage system and the power grid is off-grid, the photovoltaic energy storage system is not connected with the power grid, when the photovoltaic energy storage system supplies alternating current to an external load, the same-phase output of all the sub-photovoltaic energy storage systems in the photovoltaic energy storage system is achieved. Therefore, the phase locking of the photovoltaic energy storage system in grid connection or off-grid is controlled by the sub-photovoltaic energy storage system serving as the host through the synchronous signal, and the synchronous signal is transmitted through the special controller local area network, so that the interference of the synchronous signal in the transmission process is reduced, and the phase locking of each sub-photovoltaic energy storage system in the photovoltaic energy storage system is more accurately synchronized.
Drawings
FIG. 1 is a flow chart illustrating an embodiment of a genlock method applied to a host according to the present invention;
FIG. 2 is a flow chart illustrating an embodiment of a genlock method applied to a slave device according to the present application;
FIG. 3 is a flowchart illustrating an embodiment of a genlock method for a master and a slave according to the present invention;
FIG. 4 is a schematic structural diagram of an embodiment of a genlock apparatus according to the present invention;
FIG. 5 is a schematic structural diagram of another embodiment of a genlock apparatus according to the present invention;
FIG. 6 is a schematic structural diagram of an embodiment of a computer device according to the present application.
Detailed Description
An object of the embodiments of the present application is to provide a method and a related apparatus for performing phase lock synchronization through a controller area network, which aim to solve the technical problem that in the prior art, when a plurality of sub-photovoltaic energy storage systems are combined in parallel to form a photovoltaic energy storage system for phase lock, the phase lock of each sub-photovoltaic energy storage system is not accurate and uniform enough.
It should be noted that the photovoltaic energy storage system of the embodiment of the present application refers to a device for storing and managing the electric energy generated by the solar photovoltaic power generation matrix, and the storage of the electric energy generated by the solar photovoltaic power generation matrix generally uses a storage battery for storage, and the embodiment of the present application mainly relates to a technical scheme for converting the electric energy stored in the storage battery into alternating current to be output to the power grid or directly supplying power to an external load, and in particular relates to a photovoltaic energy storage system formed by connecting a plurality of sub-photovoltaic energy storage systems in parallel, which needs to uniformly control the process of converting all the sub-photovoltaic energy storage systems into alternating current effectively and uniformly, so as to avoid electric energy waste caused by inconsistent alternating current output phases of the sub-photovoltaic energy storage systems when the sub-photovoltaic energy storage systems are connected to the power grid, and also avoid electric energy from being poured into other sub-photovoltaic energy storage systems caused by inconsistent alternating current output phases of the sub-photovoltaic energy storage systems when the sub-photovoltaic energy storage systems are disconnected from the grid, which in turn may lead to circulation within the machine beyond the level that the machine can withstand, which in turn may lead to damage to the semiconductor device and even to the risk of explosion. According to the method, hardware equipment does not need to be changed on a large scale, only one sub-photovoltaic energy storage system in the photovoltaic energy storage systems is set as a host, and other sub-photovoltaic energy storage systems are set as slaves, and then the method is executed according to the method, so that the cost is saved.
In this embodiment, cables, which are used for outputting power to a power grid, of all the sub-photovoltaic energy storage systems are connected in parallel and then unified to output power to a utility power, cables, which are used for outputting alternating current to an external load, of all the sub-photovoltaic energy storage systems are connected in parallel and then form one or more output ports, the external load obtains the alternating current output of the photovoltaic energy storage systems through the output ports, and the sub-photovoltaic energy storage systems, which are at least used as hosts in the photovoltaic energy storage systems, are in communication connection with all the parallel sub-photovoltaic energy storage systems through a Controller Area Network (CAN), preferably, every two sub-photovoltaic energy storage systems are connected through the Controller Area Network (CAN), so that any one sub-photovoltaic energy storage system is selected as a host according to practical application. The controller area network is also called CAN bus protocol, is a serial communication protocol of ISO international standardization, belongs to the field bus category, and is a serial communication network which effectively supports distributed control or real-time control.
Referring to fig. 1, an embodiment of the present invention is a method for phase locking in a photovoltaic energy storage system including a master and a slave, including:
101. and monitoring the connection state with the power grid, wherein the connection state comprises grid connection and grid disconnection.
The host computer of the embodiment of the application needs to monitor the connection state with the power grid at any time so as to know the connection state of the host computer and the power grid. In the embodiment of the application, the monitoring of the connection state of the host to the power grid is taken as a standard, and if the host determines that the connection state of the host and the power grid is grid-connected, the connection state of the photovoltaic energy storage system and the power grid is considered to be grid-connected; and if the host determines that the connection state of the photovoltaic energy storage system and the power grid is off-grid, the connection state of the photovoltaic energy storage system and the power grid is off-grid. If the connection state monitored in the step is grid connection, executing a subsequent step 102; if the connection status monitored in this step is off-network, step 104 is executed.
102. And acquiring a mains supply zero-crossing signal of the power grid, and triggering the mains supply zero-crossing signal to send a synchronous signal to the slave.
When the connection state with the power grid is determined to be grid-connected in step 101, the host computer obtains a mains zero-crossing signal of the power grid in this step, where the mains zero-crossing signal is a signal generated when the power grid is located at a 0-degree start position in a sinusoidal cycle (for example, the power grid in continental china is sinusoidal ac with a voltage of 220V and a frequency of 50 HZ), and the signal may be generated by a detection circuit for detecting the power grid in real time by the host computer. In this step, the master is triggered to send a synchronization signal to the slave according to the commercial power zero-crossing signal, the synchronization signal is used for indicating the slave and the master to perform synchronous phase locking, and the synchronization signal is transmitted through a special controller local network, that is, the synchronization signal may be a can (controller area network) data packet, so as to ensure that the synchronization signal is rapidly transmitted and is not interfered, and further ensure that the phase locking of each sub-photovoltaic energy storage system in the subsequent step is more accurately synchronized.
103. And performing synchronous phase locking with the slave according to the synchronous signal.
After step 102 or step 104, the phase locking with the slave is performed according to the guidance of the synchronization signal, so that the phase locking of each sub-photovoltaic energy storage system in the photovoltaic energy storage system is more accurately synchronized.
104. And acquiring a host zero-crossing signal of the host, and triggering the host zero-crossing signal to send a synchronous signal to the slave.
It can be understood that, an inverter for converting the direct current of the storage battery into the alternating current is installed in the host, when it is determined in step 101 that the connection state with the power grid is off-grid, the host acquires a host zero-crossing signal in this step, where the host zero-crossing signal refers to a signal generated when the inverter of the host converts the direct current output in the storage battery into a 0-degree starting position in a sine cycle of the sinusoidal alternating current, and this signal may be generated by a detection circuit that detects the sinusoidal alternating current output by the host in real time. In the step, the master is triggered to send a synchronous signal to the slave according to the master zero-crossing signal, the synchronous signal is used for indicating the slave and the master to carry out synchronous phase locking, and the synchronous signal is transmitted through a special controller local network so as to ensure the quick transmission and the non-interference of the synchronous signal, so that the phase locking of each sub-photovoltaic energy storage system in the photovoltaic energy storage system is more accurately synchronized.
Referring to fig. 2, another embodiment of the present invention is a method for phase locking in a photovoltaic energy storage system including a master and a slave, including:
201. and receiving a synchronous signal sent by the host, wherein the synchronous signal is a network signal and is transmitted through a controller area network.
The slave machine of the embodiment of the application only needs to pay attention to the synchronous signal sent by the master machine and timely receives the synchronous signal transmitted by the sub-photovoltaic energy storage system serving as the master machine in the photovoltaic energy storage system through a special controller local network, wherein the synchronous signal is a network signal.
202. And performing synchronous phase locking with the host according to the synchronous signal.
When the slave receives the synchronization signal sent by the master in step 201, the slave performs a phase lock with the master according to the synchronization signal.
Therefore, in the embodiment of the application, the sub-photovoltaic energy storage systems as the slave machines do not need to monitor the connection state of the power grid independently, and the slave machines only need to respond to the synchronous signals of the host machine to perform phase locking no matter the photovoltaic energy storage systems are in the grid-connected or off-grid connection state, so that the control logic is simplified, and the slave machines and the host machine perform phase locking according to the same synchronous signals, so that the phase locking of each sub-photovoltaic energy storage system in the photovoltaic energy storage system is more accurately synchronized.
Referring to fig. 3, another embodiment of the genlock method according to the present invention is described in detail with reference to the interaction between the master and the slave, and includes:
301. the host monitors the connection state with the power grid.
The execution of this step is similar to step 101 in the embodiment of fig. 1, and is not described again here.
302. And if the host determines that the connection state is grid connection, acquiring a mains supply zero-crossing signal of the power grid, and triggering a synchronization signal by the mains supply zero-crossing signal.
The execution of this step is similar to the step 102 in the embodiment of fig. 1, and is not repeated here.
In addition, in order to ensure reliable transmission of the synchronization signal, data whose synchronization signal is set to the highest priority may be transmitted.
303. If the host determines that the connection state is off-grid, a host zero-crossing signal of the host is acquired, and the host zero-crossing signal triggers a synchronization signal.
The execution of this step is similar to the step 104 in the embodiment of fig. 1, and is not repeated here.
In addition, in order to ensure reliable transmission of the synchronization signal, data whose synchronization signal is set to the highest priority may be transmitted.
304. The master machine sends a synchronous signal to the slave machine, and the slave machine receives the synchronous signal sent by the master machine.
After step 302 or step 303, the master sends a synchronization signal to the slave, and the slave may receive the synchronization signal through a dedicated controller local network.
It is understood that, in the embodiment of the present application, the synchronization signal sent by the master to the slave may be periodic, for example, one or more power frequency cycles (i.e., sinusoidal ac cycles of ac power) are taken as a cycle, and the master sends the synchronization signal to the slave once in each cycle, so that the slave periodically performs phase lock with the master, which plays a role in avoiding periodic error accumulation.
305. And the master machine carries out synchronous phase locking with the slave machine according to the synchronous signal.
In one embodiment, if the host determines that the photovoltaic energy storage system is in a grid-connected connection state, the host directly performs phase locking according to the synchronization signal acquired in step 302, that is, the host adjusts the phase of the alternating current output by the host to 0 degree; if the host determines that the photovoltaic energy storage system is in the off-grid connection state, the host waits for the slave to perform synchronous phase locking with the host in the step, and the host does not adjust the phase of the alternating current output by the host.
It can be understood that, in another embodiment, when the master and the slave share a set of time standard, the master of the embodiment of the present application may also perform phase locking, which is different from a conventional technical scheme in which the slave performs phase locking according to a hardware zero-crossing signal of the master but the master does not perform phase locking, the master of the embodiment of the present application performs phase locking after sending a synchronization signal to the slave in step 304 by a first preset compensation time duration, where the phase locking refers to adjusting a phase of an alternating current output by the master to 0 degree, where the first preset compensation time duration is a time duration required for the synchronization signal to be transmitted from the master to the slave. When the number of the slaves is greater than or equal to 2, the first preset compensation time length is preferably the longest time length required for the synchronization signal to be transmitted from the master to one of the slaves (the farthest slave). The first preset compensation duration can be obtained by detecting after analog synchronization signal transmission is performed in advance.
306. And the slave machine carries out synchronous phase locking with the master machine according to the synchronous signal.
In one embodiment, when the slave receives the synchronization signal sent by the master in step 304, the slave calculates a current phase according to the synchronization signal and a preset compensation time length, where the preset compensation time length is a time length required for the synchronization signal to be transmitted from the master to the slave, and the current phase is a target phase to which a phase of 0-degree alternating current represented when the synchronization signal is sent is changed corresponding to the preset compensation time length. It should be noted that, since the sinusoidal ac output by the photovoltaic energy storage system is a standard sinusoidal waveform (for example, a sinusoidal ac with a voltage of 220V and a frequency of 50 HZ), the target phase corresponding to the preset compensation duration of the synchronization signal representing the phase of the ac with 0 degree is also a uniquely determined phase value, so that the slave can obtain the current phase corresponding to the master through calculation, and directly use the current phase to implement the genlock with the master.
In another embodiment, when the master and the slave share a set of time standards, the slave in the embodiment of the present application may not perform phase locking immediately when receiving the synchronization signal sent by the master, but perform phase locking through a second preset compensation duration by the slave, where the second preset duration is a duration obtained by subtracting a duration in which the synchronization signal is transmitted from the master to the slave from a longest duration required by the synchronization signal transmitted from the master to the farthest slave. Specific examples are as follows: when there is only one slave machine, because the synchronization signal is sent from the master machine, when the synchronization signal is transmitted to the slave machine, there is inevitably a certain time delay, in order to implement the phase-locking between the master machine and the slave machine, the master machine needs to perform the phase-locking when a first preset compensation duration passes when sending the synchronization signal (see the description of the corresponding embodiment in step 305 specifically), and the slave machine performs the phase-locking immediately when receiving the synchronization signal, at this time, the second preset compensation duration is 0, at this time, the first preset compensation duration is the time required for the synchronization signal to be transmitted from the master machine to the slave machine; when the number of the slave machines is greater than or equal to 2, because the synchronization signals are sent from the master machine, the time lengths required for the synchronization signals to be transmitted to different slave machines are different, at this time, the second preset compensation time length of each slave machine is obtained by subtracting the time length required for the synchronization signals to be transmitted from the master machine to the farthest slave machine from the time length required for the synchronization signals to be transmitted from the master machine to the current slave machine, so as to ensure that all the slave machines synchronously phase-lock with the master machine while the farthest slave machine receives the synchronization signals, where phase-locking means that the master machine adjusts the phase of the alternating current output by the master machine to 0 degree. The second preset compensation duration corresponding to a certain slave machine can be obtained by detecting after the analog synchronization signal is transmitted from the master machine to the corresponding slave machine in advance.
307. The slave generates status information to the master.
The slave can send own state information to the master, so that the master can know the operation state of the slave. The status information here may include: photovoltaic power generation power, battery output power, battery remaining capacity (SOC), and the like.
308. And the master machine generates control information for the slave machine according to the state information.
The master machine learns the operating states of all the sub-photovoltaic energy storage systems in the whole photovoltaic energy storage system according to the state information provided by the slave machine in the step 307, and then can generate control information for coordinating all the sub-photovoltaic energy storage systems according to a preset program instruction logic, wherein the control information is used for controlling the charging power or the discharging power of the slave machine.
309. The master sends control information to the slave.
The master may send the control information formed in step 308 to the slave through the controller area network.
310. The slave executes the control information.
And executing the control information received in step 309 by each slave photovoltaic energy storage system serving as a slave machine so as to achieve system balance of the photovoltaic energy storage system.
The above-mentioned embodiment describes the genlocking method of the present application, and the following describes the genlocking device of the present application, please refer to fig. 4, and the genlocking device of the embodiment of the present application, which is implemented through a controller area network, is applied to a master in a photovoltaic energy storage system composed of the master and a slave, and includes:
the monitoring unit 401 is configured to monitor a connection state of the photovoltaic energy storage system and a power grid, where the connection state includes grid connection and grid disconnection;
a first obtaining unit 402, configured to obtain a mains zero-crossing signal of the power grid if the connection state is grid-connected;
a first sending unit 403, configured to send the synchronization signal to the slave machine by being triggered by the mains zero-crossing signal, where the synchronization signal is a network signal and is transmitted through a controller local area network;
a second obtaining unit 404, configured to obtain a host zero-crossing signal of the host if the connection state is off-grid;
a second sending unit 405, configured to trigger sending of a synchronization signal to the slave by the master zero crossing signal,
and a phase locking unit 406, configured to perform phase locking with the slave according to the synchronization signal.
Optionally, when the first sending unit 403 or the second sending unit 405 sends the synchronization signal to the slave, the method is specifically configured to:
periodically transmitting the synchronization signal to the slave;
the performing the synchronous phase locking with the slave machine according to the synchronous signal comprises:
and periodically carrying out synchronous phase locking with the slave machine according to the synchronous signal.
Optionally, the genlock apparatus further includes:
a receiving unit 407, configured to receive current state information of the slave;
a generating unit 408, configured to generate control information for the slave according to the state information, where the control information is used to control charging power or discharging power of the slave;
a third sending unit 409, configured to send the control information to the slave, so that the slave executes the control information. .
The operation performed by the genlock apparatus according to the embodiment of the present invention is similar to the operation performed by the host in fig. 1 and 3, and is not repeated herein.
Referring to fig. 5, another phase lock device for performing phase lock via a controller area network according to an embodiment of the present application is applied to a slave in a photovoltaic energy storage system including a master and a slave, and includes:
a first receiving unit 501, configured to receive a synchronization signal sent by the host, where the synchronization signal is a network signal and is transmitted through a controller area network;
a phase locking unit 502, configured to perform phase locking with the host according to the synchronization signal.
Optionally, when the sending unit 503 receives the synchronization signal sent by the host, it is specifically configured to:
periodically receiving the synchronization signal sent by the host;
when the phase locking unit performs synchronous phase locking with the host according to the synchronous signal, the phase locking unit is specifically configured to:
and carrying out periodic synchronous phase locking with the host according to the synchronous signal.
Optionally, when the phase locking unit 502 performs synchronous phase locking with the host according to the synchronization signal, the phase locking unit is specifically configured to:
calculating to obtain a current phase according to the synchronous signal and a preset compensation time length, wherein the preset compensation time length is a time length required by the synchronous signal to be transmitted from the host to the slave;
and performing synchronous phase locking with the host by using the current phase.
Optionally, the genlock apparatus further includes:
a sending unit 503, configured to send current state information to the master, so that the master generates and replies control information for the slave according to the state information, where the control information is used to control charging power or discharging power of the slave;
a second receiving unit 504, configured to receive the control information sent by the host;
an execution unit 505 is configured to execute the control information.
The operation performed by the genlock apparatus according to the embodiment of the present application is similar to the operation performed by the slave in fig. 2 and 3, and is not repeated herein.
Referring to fig. 6, a computer device in an embodiment of the present application is described below, where an embodiment of the computer device in the embodiment of the present application includes:
the computer device 600 may include one or more processors (CPUs) 601 and a memory 602, where one or more applications or data are stored in the memory 602. Wherein the memory 602 is volatile storage or persistent storage. The program stored in the memory 602 may include one or more modules, each of which may include a sequence of instructions operating on a computer device. Still further, the processor 601 may be arranged in communication with the memory 602 to execute a series of instruction operations in the memory 602 on the computer device 600. The computer device 600 may also include one or more network interfaces 603, one or more input-output interfaces 604, and/or one or more operating systems, such as Windows Server, Mac OS, Unix, Linux, FreeBSD, etc. The processor 601 may execute the operations executed by the master or the slave in the embodiments shown in fig. 1 to fig. 3, and details thereof are not repeated herein.
In the several embodiments provided in the embodiments of the present application, it should be understood by those skilled in the art that the disclosed system, apparatus and method can be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the unit is only one logical functional division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit. The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and the like.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for performing synchronous phase locking through a controller area network is applied to a master machine in a photovoltaic energy storage system consisting of the master machine and slave machines, and comprises the following steps:
monitoring the connection state of the photovoltaic energy storage system and a power grid, wherein the connection state comprises grid connection and grid disconnection;
if the connection state is grid connection, acquiring a mains supply zero-crossing signal of the power grid, and triggering the mains supply zero-crossing signal to send a synchronization signal to the slave machine, wherein the synchronization signal is a network signal and is transmitted through a controller local area network;
if the connection state is off-network, acquiring a host zero-crossing signal of the host, and triggering the host zero-crossing signal to send the synchronous signal to the slave;
and carrying out synchronous phase locking with the slave machine according to the synchronous signal.
2. The method for genlock via a controller area network as claimed in claim 1, wherein said transmitting a synchronization signal to said slave includes:
periodically transmitting the synchronization signal to the slave;
the performing the synchronous phase locking with the slave machine according to the synchronous signal comprises:
and periodically carrying out synchronous phase locking with the slave machine according to the synchronous signal.
3. The method for genlock via a controller area network as claimed in claim 1, wherein after genlock with the slave according to the synchronization signal, the method further comprises:
receiving the current state information of the slave;
generating control information for the slave according to the state information, wherein the control information is used for controlling the charging power or the discharging power of the slave;
sending the control information to the slave machine so that the slave machine executes the control information.
4. A method for performing synchronous phase locking through a controller area network is characterized in that the method is applied to a slave machine in a photovoltaic energy storage system consisting of a master machine and the slave machine, and comprises the following steps:
receiving a synchronous signal sent by the host, wherein the synchronous signal is a network signal and is transmitted through a controller local area network;
and performing synchronous phase locking with the host according to the synchronous signal.
5. The method as claimed in claim 4, wherein the receiving the synchronization signal transmitted from the host comprises:
periodically receiving the synchronization signal sent by the host;
the performing the genlock with the host according to the synchronization signal includes:
and carrying out periodic synchronous phase locking with the host according to the synchronous signal.
6. The method of genlock via a controller area network as recited in claim 4, wherein said genlock with the host based on the synchronization signal comprises:
calculating to obtain a current phase according to the synchronous signal and a preset compensation time length, wherein the preset compensation time length is a time length required by the synchronous signal to be transmitted from the host to the slave;
and performing synchronous phase locking with the host by using the current phase.
7. The method for genlock via a controller area network of claim 4, wherein after genlock with the host based on the synchronization signal, the method further comprises:
sending current state information to the master machine so that the master machine generates and replies control information to the slave machine according to the state information, wherein the control information is used for controlling the charging power or the discharging power of the slave machine;
receiving the control information sent by the host;
and executing the control information.
8. A device for performing synchronous phase locking through a controller area network is applied to a master machine in a photovoltaic energy storage system consisting of the master machine and slave machines, and comprises the following components:
the monitoring unit is used for monitoring the connection state with the power grid, and the connection state comprises grid connection and grid disconnection;
the first acquisition unit is used for acquiring a mains supply zero-crossing signal of the power grid if the connection state is grid connection;
the first sending unit is used for sending a synchronization signal to the slave machine by triggering of the commercial power zero-crossing signal, wherein the synchronization signal is a network signal and is transmitted through a controller local area network;
the second acquisition unit is used for acquiring a host zero-crossing signal of the host if the connection state is off-grid;
the second sending unit is used for sending the synchronous signal to the slave machine under the trigger of the host machine zero-crossing signal;
and the phase locking unit is used for carrying out synchronous phase locking with the slave machine according to the synchronous signal.
9. The device for performing synchronous phase locking through a controller area network is applied to a slave machine in a photovoltaic energy storage system consisting of a master machine and the slave machine, and comprises the following components:
the first receiving unit is used for receiving a synchronous signal sent by the host, wherein the synchronous signal is a network signal and is transmitted through a controller local area network;
and the phase locking unit is used for carrying out synchronous phase locking with the host according to the synchronous signal.
10. A computer device, comprising:
the system comprises a processor, a memory, a bus, an input/output interface and a network interface;
the processor is connected with the memory, the input/output interface and the network interface through a bus;
the memory stores a program;
the processor, when executing the program stored in the memory, implementing the method of any of claims 1 to 7.
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