CN113394811B - Method for synchronous phase locking through controller local area network and related device - Google Patents

Method for synchronous phase locking through controller local area network and related device Download PDF

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Publication number
CN113394811B
CN113394811B CN202110837375.3A CN202110837375A CN113394811B CN 113394811 B CN113394811 B CN 113394811B CN 202110837375 A CN202110837375 A CN 202110837375A CN 113394811 B CN113394811 B CN 113394811B
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host
slave
signal
synchronous
phase locking
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CN113394811A (en
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王进
夏静
何爽
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Shenzhen Lux Power Technology Co ltd
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Shenzhen Lux Power Technology Co ltd
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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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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

Abstract

The application is suitable for the technical field of control of photovoltaic energy storage systems, provides a synchronous phase locking method through a controller area network and a related device, and aims to solve the technical problem that phase locking among all sub photovoltaic energy storage systems is not accurate enough when the photovoltaic energy storage systems are subjected to synchronous phase locking. When the method of the embodiment of the application is applied to the sub-photovoltaic energy storage system serving as a 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, triggering the mains supply zero crossing signal to send a synchronizing signal to the slave, wherein the synchronizing signal is a network signal, and the synchronizing signal 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 according to the synchronous signal.

Description

Method for synchronous phase locking through controller local area network and related device
Technical Field
The application belongs to the technical field of control of photovoltaic energy storage systems, and particularly relates to a synchronous phase locking method through a controller local area network and a related device.
Background
It is known that the photovoltaic power generation industry is greatly affected by natural environments, especially natural factors such as sunlight duration and ambient temperature. A plurality of photovoltaic energy storage systems are often built intensively in a proper natural environment to improve the generated energy of a solar photovoltaic power generation matrix and the stored energy of a 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 and are arranged together 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 the sub-photovoltaic energy storage systems are connected or disconnected, and the power supply requirements of most of current loads are met.
For the photovoltaic energy storage system with a plurality of sub-photovoltaic energy storage systems, when the grid-connected state supplies power to the power grid, the phase of alternating current output by each sub-photovoltaic energy storage system to the power grid is required to be consistent with the phase of the power grid. In the prior art, each sub-photovoltaic energy storage system monitors the phase of the power grid by itself and performs phase locking by adopting a hardware zero crossing signal, then all sub-photovoltaic energy storage systems perform phase locking on the power grid respectively, and because the monitoring precision of the sub-photovoltaic energy storage systems on the power grid is different, it is likely that uniform phase connection between the sub-photovoltaic energy storage systems and the power grid cannot be realized, and energy waste is caused, so that potential safety hazards exist; in addition, when the load is provided with alternating current output by off-grid, all the sub-photovoltaic energy storage systems listen to the hardware zero-crossing signal of one sub-photovoltaic energy storage system set as a host for phase locking, and the hardware zero-crossing signal is generated when the 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, so that the hardware zero-crossing signal is directly used for transmission, the signal stability is poor, the signal transmission is easy to be interfered, and the sub-photovoltaic energy storage systems are easy to be caused to be incapable of realizing uniform phase locking.
That is, in the prior art, a technical solution for implementing precise phase locking of a photovoltaic energy storage system formed by connecting a plurality of sub-photovoltaic energy storage systems in parallel is urgently needed.
Disclosure of Invention
The embodiment of the application aims to provide a synchronous phase locking method and a related device through a controller local area network, and aims to solve the technical problem that each sub-photovoltaic energy storage system is not accurate and uniform in phase locking when a plurality of sub-photovoltaic energy storage systems are combined in parallel to form a photovoltaic energy storage system for phase locking in the prior art.
The first aspect of the present application provides a method for performing synchronous phase locking through a controller area network, which is applied to a host in a photovoltaic energy storage system composed of the host and a slave, and comprises:
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, triggering the mains supply zero crossing signal to send a synchronizing signal to the slave, wherein the synchronizing signal is a network signal, and the synchronizing signal 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 according to the synchronous signal.
Optionally, the sending the synchronization signal to the slave includes:
periodically transmitting the synchronization signal to the slave;
the step of performing synchronous phase locking with the slave according to the synchronous signal comprises the following steps:
and periodically performing synchronous phase locking with the slave according to the synchronous signal.
Optionally, after performing the phase lock with the slave according to the synchronization signal, the method further includes:
receiving 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;
and 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 synchronous phase locking method applied to a slave in a photovoltaic energy storage system composed of a master and a slave, comprising:
receiving a synchronous signal sent by the host, wherein the synchronous signal is a network signal, and the synchronous signal 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 synchronous signal sent by the host;
the step of performing synchronous phase locking with the host according to the synchronous signal comprises the following steps:
and performing periodic synchronous phase locking with the host according to the synchronous signal.
Optionally, the performing the synchronous phase locking with the host according to the synchronous signal includes:
calculating a current phase according to the synchronous signal and a preset compensation time length, wherein the preset compensation time length is the 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 the phase lock with the host according to the synchronization signal, the method further includes:
transmitting current state information to the host computer so that the host computer generates and returns control information to the slave computer according to the state information, wherein the control information is used for controlling the charging power or the discharging power of the slave computer;
receiving the control information sent by the host;
and executing the control information.
A third aspect of the present application provides a genlock device applied to a host and a slave in a photovoltaic energy storage system, including:
the monitoring unit is used for monitoring the connection state of the photovoltaic energy storage system and the 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 triggering the mains supply zero crossing signal to send a synchronizing signal to the slave, wherein the synchronizing 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-network;
a second transmitting unit, configured to trigger by the master zero crossing signal to transmit the synchronization signal to the slave,
and the phase locking unit is used for carrying out synchronous phase locking with the slave according to the synchronous signal.
Optionally, when the first sending unit or the second sending unit sends a synchronization signal to the slave, the method is specifically used for:
periodically transmitting the synchronization signal to the slave;
the step of performing synchronous phase locking with the slave according to the synchronous signal comprises the following steps:
and periodically performing synchronous phase locking with the slave according to the synchronous signal.
Optionally, the genlock device 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 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;
and a third sending unit, configured to send the control information to the slave, so that the slave executes the control information.
A fourth aspect of the present application provides another genlock apparatus for use in a photovoltaic energy storage system composed of a master and a slave, comprising:
the first receiving unit is used for receiving the synchronous signal sent by the host, wherein the synchronous signal is a network signal, and the synchronous signal is transmitted through a controller 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 synchronous signal sent by the host;
the phase locking unit is specifically configured to, when performing synchronous phase locking with the host according to the synchronization signal:
and performing periodic synchronous phase locking with the host according to the synchronous signal.
Optionally, the phase locking unit is specifically configured to, when performing synchronous phase locking with the host according to the synchronization signal:
calculating a current phase according to the synchronous signal and a preset compensation time length, wherein the preset compensation time length is the 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 device further includes:
the sending unit is used for sending current state information to the host computer so that the host computer generates and returns control information to the slave computer according to the state information, and the control information is used for controlling the charging power or the discharging power of the slave computer;
the second receiving unit is used for receiving the control information sent by the host;
and the execution unit is used for executing the control information.
A fifth aspect of the present application provides a computer apparatus comprising:
processor, memory, bus, input/output interface, network interface;
the processor is connected with the memory, the input/output interface and the network interface through buses;
the memory stores a program;
the processor, when executing the program stored in the memory, implements the method of any one of the foregoing first or second aspects.
A sixth aspect of the application provides a computer storage medium having instructions stored therein which, 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 application provides a computer program product which, when executed on a computer, causes the computer to perform the method as described in the first or second aspect above.
The above technical solution can be seen that the embodiment of the application has the following advantages:
when the synchronous phase locking method is applied to a host in a photovoltaic energy storage system composed of a host and a slave, the host is required to monitor the connection state of the photovoltaic energy storage system and a power grid, if the connection state is grid-connected, the connection state indicates that the photovoltaic energy storage system is connected with the power grid, when the photovoltaic energy storage system supplies power to the power grid at this time, 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 be phase-locked according to the phase of the power grid alternating current so as to achieve that the phase of the alternating current output by the photovoltaic energy storage system and the phase of the power grid are in an acceptable range (generally, the phase difference between the alternating current output by the photovoltaic energy storage system and the power grid is not more than 1 ℃), the embodiment of the application obtains a mains supply zero crossing signal of the power grid through the host, then triggers the host to send a synchronous signal to the slave through the mains supply zero crossing signal, and then enables the host and the slave to synchronously phase-lock according to the synchronous signal, so that the host and the slave serving as a sub-photovoltaic energy storage system in the photovoltaic energy storage system perform synchronous phase locking according to the same synchronous signal, so that each sub-phase locking of the sub-photovoltaic energy storage system in the photovoltaic energy storage system is more accurate. 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, and when the photovoltaic energy storage system provides alternating current for an externally connected load at the moment, in order to enable all the sub photovoltaic energy storage systems in the photovoltaic energy storage system to achieve same-phase output, the embodiment of the application enables the phase locking of all the sub photovoltaic energy storage systems in the photovoltaic energy storage system to be more accurate and synchronous by acquiring a host zero-crossing signal of the sub photovoltaic energy storage system serving as the host, triggering the host to send a synchronous signal to the slave by the host zero-crossing signal, and enabling the slave to carry out synchronous phase locking with the host according to the synchronous signal. Therefore, the phase locking of the photovoltaic energy storage system in the embodiment of the application is controlled by the sub-photovoltaic energy storage system serving as the host through the synchronous signal when the photovoltaic energy storage system is connected or disconnected, 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 synchronous.
Drawings
FIG. 1 is a flowchart of an embodiment of a method for synchronous phase locking of the present application applied to a host;
FIG. 2 is a flow chart of an embodiment of the present application of a synchronous phase locking method applied to a slave;
FIG. 3 is a flowchart of a method for phase lock synchronization according to an embodiment of the present application;
FIG. 4 is a schematic diagram illustrating an embodiment of a lock phase synchronization device according to the present application;
fig. 5 is a schematic structural diagram of another embodiment of a genlock apparatus according to the present application;
FIG. 6 is a schematic diagram of a computer device according to an embodiment of the present application.
Detailed Description
The embodiment of the application aims to provide a synchronous phase locking method and a related device through a controller local area network, and aims to solve the technical problem that each sub-photovoltaic energy storage system is not accurate and uniform in phase locking when a plurality of sub-photovoltaic energy storage systems are combined in parallel to form a photovoltaic energy storage system for phase locking in the prior art.
It should be noted that, the photovoltaic energy storage system in the embodiment of the present application refers to a device for storing and managing electric energy generated by a solar photovoltaic power generation matrix, and the storage of electric energy generated by the solar photovoltaic power generation matrix generally uses a storage battery to store the electric energy, and the embodiment of the present application mainly relates to a technical scheme for converting electric energy stored in the storage battery into alternating current and outputting the alternating current to a 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. The method of the embodiment of the application does not need to carry out large-scale change on hardware equipment, only one sub-photovoltaic energy storage system in the photovoltaic energy storage systems is set as a host, other sub-photovoltaic energy storage systems are set as slaves, and then the method of the embodiment of the application is executed, thereby saving the cost.
In the embodiment of the application, after cables for outputting the power grid by all the sub-photovoltaic energy storage systems are connected in parallel, one port is unified for outputting the power grid, and in the embodiment of the application, the cables for outputting alternating current by all the sub-photovoltaic energy storage systems to an externally connected load are connected in parallel to form one or more output ports, the externally connected load obtains the alternating current output of the photovoltaic energy storage systems through the output ports, and at least the sub-photovoltaic energy storage system serving as a host in the photovoltaic energy storage systems is in communication connection with all the sub-photovoltaic energy storage systems in parallel through a controller local area network (controller area network, CAN), preferably all the sub-photovoltaic energy storage systems are connected in pairs through the controller local area network (controller area network, CAN), so that any sub-photovoltaic energy storage system CAN be selected as the host according to practical application. The controller area network is also called CAN bus protocol, is an ISO international standardized serial communication protocol, 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 a genlock method of the present application is applied to a host in a photovoltaic energy storage system composed of a host and a slave, and includes:
101. and monitoring the connection state with the power grid, wherein the connection state comprises grid connection and grid disconnection.
The host 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 with the power grid. In the embodiment of the application, the connection state of the host to the power grid is monitored, 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 with the power grid is off-grid, the connection state of the photovoltaic energy storage system and the power grid is considered to be off-grid. If the connection state monitored in the step is grid connection, executing the subsequent step 102; if the connection status monitored in this step is off-line, step 104 is performed.
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 step 101 determines that the connection state with the power grid is grid-connected, the host computer obtains a mains supply zero crossing signal of the power grid in the step, where the mains supply zero crossing signal refers to a signal generated when the power grid is located at a 0 degree initial position in a sinusoidal period (for example, the power grid is sinusoidal alternating current with the voltage of 220V and the frequency of 50 HZ), and the signal can be generated by a detection circuit for detecting the power grid in real time by the host computer. The step triggers the host to send a synchronization signal to the slave according to the mains supply zero crossing signal, the synchronization signal is used for indicating the slave to perform synchronous phase locking with the host, the synchronization signal is transmitted through a special controller local network, namely the synchronization signal can be a CAN (controller area network) data packet, so that the rapid transmission of the synchronization signal is ensured, the synchronization signal is not interfered, and the phase locking of each sub-photovoltaic energy storage system in the subsequent step is ensured to be more accurately synchronous.
103. And performing synchronous phase locking with the slave according to the synchronous signal.
After step 102 or step 104, the step performs synchronous phase locking with the slave according to the direction of the synchronous signal, so as to realize more accurate phase locking of each sub-photovoltaic energy storage system in the photovoltaic energy storage system.
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 the host is provided with an inverter for converting direct current of the storage battery into alternating current, when step 101 determines that the connection state with the power grid is off-grid, the host obtains a host zero-crossing signal of the host in the step, where the host zero-crossing signal refers to a signal generated when the inverter of the host converts direct current output of the storage battery into a 0-degree initial position in a sine cycle of sinusoidal alternating current, and the signal can be generated by a detection circuit for detecting the sinusoidal alternating current output by the host in real time. The step triggers the host to send a synchronizing signal to the slave according to the host zero crossing signal, the synchronizing signal is used for indicating the slave to carry out synchronous phase locking with the host, the synchronizing signal is transmitted through a special controller local network, so that the quick transmission of the synchronizing signal is ensured and the synchronizing signal is not interfered, and the phase locking of each sub-photovoltaic energy storage system in the photovoltaic energy storage system is more accurately synchronous.
Referring to fig. 2, another embodiment of the genlock method of the present application is applied to a slave in a photovoltaic energy storage system composed of a master and a slave, and includes:
201. and receiving a synchronous signal sent by the host, wherein the synchronous signal is a network signal, and the synchronous signal is transmitted through a controller local area network.
The slave machine only needs to pay attention to the synchronous signal sent by the host machine, and timely receives the synchronous signal transmitted by the sub-photovoltaic energy storage system serving as the host 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 host in step 201, the slave performs a synchronization phase lock with the host according to the synchronization signal.
Therefore, the sub-photovoltaic energy storage system serving as the slave does not need to monitor the connection state of the power grid independently, the slave only needs to respond to the synchronous signal of the host to carry out phase locking no matter whether the photovoltaic energy storage system is in the connection state of grid connection or off-grid connection, the control logic is simplified, and the slave and the host carry out phase locking according to the same synchronous signal, so that the phase locking of each sub-photovoltaic energy storage system in the photovoltaic energy storage system is more accurate and synchronous.
Referring to fig. 3, another embodiment of the genlock method of the present application is described in detail with respect to interaction between a master and a 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 will not be described here again.
302. And if the host determines that the connection state is grid-connected, acquiring a mains supply zero crossing signal of the power grid, and triggering a synchronous signal by the mains supply zero crossing signal.
The execution of this step is similar to step 102 in the embodiment of fig. 1, and will not be described here again.
In addition, in order to ensure reliable transmission of the synchronization signal, the data for which the synchronization signal is set to the highest priority may be transmitted.
303. If the host determines that the connection state is off-network, acquiring a host zero-crossing signal of the host, and triggering a synchronous signal by the host zero-crossing signal.
The execution of this step is similar to step 104 in the embodiment of fig. 1, and will not be described here again.
In addition, in order to ensure reliable transmission of the synchronization signal, the data for which the synchronization signal is set to the highest priority may be transmitted.
304. The master sends a synchronizing signal to the slave, and the slave receives the synchronizing signal sent by the master.
After step 302 or step 303, the master sends a synchronization signal to the slave, which can be received by the slave through the dedicated controller local network.
It can be 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 periods (i.e., sinusoidal ac periods of ac) are taken as a period, and the master sends a synchronization signal to the slave in each period, so that the slave performs synchronization phase locking with the master periodically, and plays a role in avoiding periodic error accumulation.
305. And the master machine performs 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 the grid-connected connection state, the host directly performs phase locking according to the synchronization signal obtained in the 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 carry out synchronous phase locking with the host in the step, and the host does not carry out phase adjustment on alternating current output by the host.
It may be understood that, in another embodiment, when the host and the slave share a set of time standard, the host in the embodiment of the present application may also perform phase locking, unlike the conventional technical scheme that the slave performs phase locking according to the hardware zero crossing signal of the host but the host does not perform phase locking, the host in the embodiment of the present application performs phase locking after sending the synchronization signal to the slave in step 304 through a first preset compensation period, where phase locking refers to that the host adjusts the phase of the ac power output by itself to 0 degrees, where the first preset compensation period is the period required by the synchronization signal to be transmitted from the host to the slave. When the number of slaves is greater than or equal to 2, the first preset compensation duration is preferably the longest duration required for the transmission of the synchronization signal from the master to one of the slaves (the farthest slave). The first preset compensation duration can be detected after analog synchronous signal transmission is performed in advance.
306. The slave performs synchronous phase locking with the host 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 the current phase according to the synchronization signal and a preset compensation time period, where the preset compensation time period is a time period required for the synchronization signal to be transmitted from the master to the slave, and the current phase is a target phase to which the 0-degree alternating current phase represented by the synchronization signal when sent out is correspondingly changed after the preset compensation time period. 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 synchronization signal representing the phase of the 0-degree ac after the preset compensation period is also a uniquely determined phase value, so that the slave can obtain the current phase corresponding to the current phase of the host through calculation, and the slave can directly use the current phase to realize synchronous phase locking with the host.
In another embodiment, when the master and the slave share a set of time standard, the slave in the embodiment of the present application may also not immediately perform phase locking when receiving the synchronization signal sent by the master, but the slave performs phase locking after a second preset compensation period, where the second preset period is a period obtained by subtracting a period of transmitting the synchronization signal from the master to the slave from a longest period required by transmitting the synchronization signal from the master to the farthest slave. Specific examples are as follows: when there is only one slave, since the synchronization signal is sent from the master, when the synchronization signal is transmitted to the slave, there is inevitably a certain time delay, in order to achieve synchronous phase locking between the master and the slave, the master needs to perform phase locking when a first preset compensation period passes when the synchronization signal is sent (see the description of the corresponding embodiment in step 305 in particular), and the slave immediately performs phase locking when receiving the synchronization signal, at this time, the second preset compensation period is 0, at this time, the first preset compensation period is the time 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, because the synchronization signals are sent from the master, the time required by the synchronization signals to be transmitted to different slaves is different, at this time, the second preset compensation time of each slave is the time obtained by subtracting the time required by the synchronization signals to be transmitted from the master to the current slave from the longest time required by the synchronization signals to be transmitted from the master to the farthest slave, so as to ensure that all the slaves can synchronously lock phase with the master while receiving the synchronization signals from the farthest slave, and the phase locking refers to that the master adjusts the phase of alternating current output by the master to 0 degree. The second preset compensation time length corresponding to a certain slave machine can be obtained by detecting after analog synchronous signals are transmitted from the host machine to the corresponding slave machine in advance.
307. The slave generates status information to the master.
The slave can send its own status information to the master so that the master can know the running status of the slave. The status information here may include: photovoltaic power generation power, battery output power, battery remaining capacity (SOC), and the like.
308. The master generates control information for the slave according to the state information.
The host computer knows the running 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 computer in step 307, and can further generate control information for coordinating all the sub-photovoltaic energy storage systems according to preset program instruction logic, wherein the control information is used for controlling the charging power or the discharging power of the slave computer.
309. The master transmits control information to the slaves.
The master may send the control information formed in step 308 to the slave over the controller area network.
310. The slave executes the control information.
Each slave photovoltaic energy storage system executes the control information received in step 309 to achieve system balance of the photovoltaic energy storage system.
The above embodiments describe the method of the present application for performing the synchronous phase locking, and the following describes the device of the present application, referring to fig. 4, the device of the present application for performing the synchronous phase locking through a controller area network is applied to a host in a photovoltaic energy storage system composed of a host and a slave, and includes:
the monitoring unit 401 is configured to monitor a connection state between the photovoltaic energy storage system and the 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 trigger, by the mains supply zero crossing signal, to send the synchronization signal to the slave, where the synchronization signal is a network signal, and the synchronization signal is transmitted through a controller area network;
a second obtaining unit 404, configured to obtain a host zero-crossing signal of the host if the connection state is off-line;
a second sending unit 405, configured to trigger by the master zero crossing signal to send a synchronization signal to the slave,
and the phase locking unit 406 is used for performing synchronous phase locking with the slave according to the synchronous signal.
Optionally, when the first sending unit 403 or the second sending unit 405 sends a synchronization signal to the slave, the method is specifically used for:
periodically transmitting the synchronization signal to the slave;
the step of performing synchronous phase locking with the slave according to the synchronous signal comprises the following steps:
and periodically performing synchronous phase locking with the slave according to the synchronous signal.
Optionally, the genlock device 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;
and a third transmitting unit 409 configured to transmit the control information to the slave, so that the slave executes the control information. .
The operation performed by the genlock device according to the embodiment of the present application is similar to the operation performed by the host in fig. 1 and 3, and will not be described herein.
Referring to fig. 5, another device for performing synchronous phase locking through a controller area network according to an embodiment of the present application is applied to a slave unit in a photovoltaic energy storage system composed of a master unit and a slave unit, 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 the synchronization signal is transmitted through a controller area network;
the phase locking unit 502 is configured to perform synchronous phase locking with the host according to the synchronization signal.
Optionally, when the sending unit 503 receives the synchronization signal sent by the host, the sending unit is specifically configured to:
periodically receiving the synchronous signal sent by the host;
the phase locking unit is specifically configured to, when performing synchronous phase locking with the host according to the synchronization signal:
and performing periodic synchronous phase locking with the host according to the synchronous signal.
Optionally, the phase locking unit 502 is specifically configured to, when performing synchronous phase locking with the host according to the synchronization signal:
calculating a current phase according to the synchronous signal and a preset compensation time length, wherein the preset compensation time length is the 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 device further includes:
a sending unit 503, configured to send current status information to the host, so that the host generates and returns control information for the slave according to the status 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 for executing the control information.
The operation performed by the genlock device according to the embodiment of the present application is similar to the operation performed by the slave in fig. 2 and 3, and will not be described herein.
Referring to fig. 6, an embodiment of a computer device according to an embodiment of the present application includes:
the computer device 600 may include one or more processors (central processing units, CPU) 601 and memory 602, with one or more applications or data stored in the memory 602. Wherein the memory 602 is volatile or persistent. The program stored in the memory 602 may include one or more modules, each of which may include a series of instruction operations in a computer device. Still further, the processor 601 may be arranged to communicate with the memory 602 and 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 perform the operations performed by the master or the slave in the embodiments shown in fig. 1 to 3, and detailed descriptions thereof are omitted 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 systems, apparatuses and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units. The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods 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, random access memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, or alternatives falling within the spirit and principles of the application.

Claims (7)

1. The synchronous phase locking method is characterized by being applied to a host computer in a photovoltaic energy storage system composed of a host computer and a slave computer, wherein the photovoltaic energy storage system is composed of the host computer and a plurality of slave computers, each of the host computer and the slave computers is provided with a sub photovoltaic energy storage system, and all the sub photovoltaic energy storage systems are connected in pairs through the controller local area network, and the synchronous phase locking 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, triggering the mains supply zero crossing signal to send a synchronous signal to the slave, wherein the synchronous signal is the same network signal data packet, the synchronous signal is transmitted through a controller local area network, and the synchronous signal is set to be the data with the highest priority for transmission;
if the connection state is off-grid, acquiring a host zero-crossing signal of the host, and triggering the host zero-crossing signal to send the synchronous signal to the slave, wherein the host zero-crossing signal is a signal generated when an inverter of the host converts direct-current output in a storage battery into a 0-degree initial position in a sine period of sine alternating current;
performing synchronous phase locking with the slave according to the synchronous signal;
the sending the synchronization signal to the slave comprises:
periodically sending the synchronous signal to the slave, wherein the periodicity is the sine period of each sine alternating current;
the step of performing synchronous phase locking with the slave according to the synchronous signal comprises the following steps:
according to the synchronous signal, periodically performing synchronous phase locking with the slave;
the step of performing synchronous phase locking with the slave machine periodically according to the synchronous signal comprises the following steps:
the host performs host phase locking after a first preset compensation time length is passed after the host sends the synchronization signal to the slave, wherein the host phase locking refers to that the host adjusts the phase of alternating current output by the host to 0 degree, and the first preset compensation time length is the time length required by the synchronization signal to be transmitted from the host to the slave.
2. The method of synchronous phase locking via a controller area network of claim 1, wherein after synchronous phase locking with the slave according to the synchronization signal, the method further comprises:
receiving 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;
and sending the control information to the slave machine so that the slave machine executes the control information.
3. The synchronous phase locking method is characterized by being applied to the slave machines in a photovoltaic energy storage system composed of a master machine and slave machines, wherein the photovoltaic energy storage system is composed of one master machine and a plurality of slave machines, each slave machine is provided with a sub photovoltaic energy storage system, and all the sub photovoltaic energy storage systems are connected in pairs through the controller local network, and the synchronous phase locking method comprises the following steps:
receiving a synchronizing signal sent by the host, wherein the synchronizing signal is the same network signal data packet, the synchronizing signal is transmitted through a controller local area network, the synchronizing signal is triggered by the host according to a mains supply zero crossing signal of a power grid or the host according to a host zero crossing signal of the host, the synchronizing signal is set to be the data with the highest priority for transmission, and the host zero crossing signal is a signal generated when an inverter of the host converts direct current output in a storage battery into a 0-degree initial position in a sine period of sine alternating current;
performing synchronous phase locking with the host according to the synchronous signal;
the receiving the synchronization signal sent by the host includes:
periodically receiving the synchronous signal sent by the host, wherein the periodicity is a sine period of each sine alternating current;
the step of performing synchronous phase locking with the host according to the synchronous signal comprises the following steps:
performing periodic synchronous phase locking with the host according to the synchronous signal;
the performing periodic synchronous phase locking with the host according to the synchronous signal includes:
and the slave machine receives the synchronous signal sent by the host machine and then carries out slave machine phase locking through a second preset compensation time length, wherein the slave machine phase locking means that the slave machine adjusts the phase of alternating current output by the slave machine to be 0 degree, and the second preset compensation time length is obtained by subtracting the time length of the synchronous signal transmitted from the host machine to the current slave machine from the longest time length required by the synchronous signal transmitted from the host machine to the farthest slave machine.
4. A method of genlock via a controller area network as recited in claim 3 wherein after genlock with the host based on the synchronization signal, the method further comprises:
transmitting current state information to the host computer so that the host computer generates and returns control information to the slave computer according to the state information, wherein the control information is used for controlling the charging power or the discharging power of the slave computer;
receiving the control information sent by the host;
and executing the control information.
5. The utility model provides a carry out synchronous phase locking device through controller area network, its characterized in that is applied to by the host computer in the photovoltaic energy storage system of host computer and slave unit, the photovoltaic energy storage system by one the host computer with a plurality of the slave unit is constituteed, host computer and each the slave unit is all installed sub photovoltaic energy storage system, all link to each other through controller area network between the sub photovoltaic energy storage system two by two, include:
the monitoring unit is used for monitoring the connection state with the 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 triggering the mains supply zero crossing signal to send a synchronizing signal to the slave, wherein the synchronizing signal is the same network signal data packet, the synchronizing signal is transmitted through a controller local area network, and the synchronizing signal is set to be the data with the highest priority for transmission;
the second acquisition unit is used for acquiring a host zero-crossing signal of the host if the connection state is off-grid, wherein the host zero-crossing signal is a signal generated when an inverter of the host converts direct-current output in a storage battery into a 0-degree initial position in a sine period of sine alternating current;
the second sending unit is used for triggering the host zero crossing signal to send the synchronous signal to the slave;
the phase locking unit is used for carrying out synchronous phase locking with the slave according to the synchronous signal;
the second sending unit is specifically configured to, when sending a synchronization signal to the slave machine:
periodically sending the synchronous signal to the slave, wherein the periodicity is the sine period of each sine alternating current;
the phase locking unit is specifically configured to, when performing synchronous phase locking with the slave according to the synchronization signal:
and after the synchronous signal is sent to the slave machine, performing host phase locking through a first preset compensation time length, wherein the host phase locking means that the host machine adjusts the phase of alternating current output by the host machine to 0 degree, and the first preset compensation time length is the time length required by the synchronous signal to be transmitted from the host machine to the slave machine.
6. The utility model provides a carry out synchronous phase locking device through controller area network, its characterized in that is applied to by the host computer with the slave computer among the photovoltaic energy storage system of slave computer, the photovoltaic energy storage system by one the host computer with a plurality of the slave computer constitutes, the host computer with each the slave computer is all installed sub photovoltaic energy storage system, all link to each other through controller area network between the sub photovoltaic energy storage system two by two, include:
the first receiving unit is used for receiving a synchronous signal sent by the host, wherein the synchronous signal is the same network signal data packet, the synchronous signal is transmitted through a controller area network, the synchronous signal is triggered by the host according to a mains supply zero crossing signal of a power grid or the host according to a host zero crossing signal of the host, the synchronous signal is set to be the data with the highest priority for transmission, and the host zero crossing signal is a signal generated when an inverter of the host converts direct current output in a storage battery into a 0-degree initial position in a sine period of sine alternating current;
the phase locking unit is used for carrying out synchronous phase locking with the host according to the synchronous signal;
when the first receiving unit receives the synchronization signal sent by the host, the first receiving unit is specifically configured to:
periodically receiving the synchronous signal sent by the host, wherein the periodicity is a sine period of each sine alternating current;
the phase locking unit is specifically configured to, when performing synchronous phase locking with the host according to the synchronization signal:
performing periodic synchronous phase locking with the host according to the synchronous signal;
the phase locking unit performs periodic synchronous phase locking with the host according to the synchronous signal, and is specifically configured to:
and after receiving the synchronous signal sent by the host, performing slave phase locking through a second preset compensation time length, wherein the slave phase locking refers to that the slave adjusts the phase of alternating current output by the slave to be 0 degree, and the second preset compensation time length is obtained by subtracting the time length of the synchronous signal transmitted from the host to the current slave from the longest time length required by the synchronous signal transmitted from the host to the farthest slave.
7. A computer device, comprising:
processor, memory, bus, input/output interface, network interface;
the processor is connected with the memory, the input/output interface and the network interface through buses;
the memory stores a program;
the processor, when executing the program stored in the memory, implements the method of any one of claims 1 to 4.
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