CN112290672B - Power distribution network control system and method based on node coding mode - Google Patents

Power distribution network control system and method based on node coding mode Download PDF

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Publication number
CN112290672B
CN112290672B CN202010944681.2A CN202010944681A CN112290672B CN 112290672 B CN112290672 B CN 112290672B CN 202010944681 A CN202010944681 A CN 202010944681A CN 112290672 B CN112290672 B CN 112290672B
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converter
controller
signal
communication
coding
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CN112290672A (en
Inventor
孙厚涛
武迪
俞拙非
杨志宏
马嘉远
李津
马涛
马慧卓
祁天星
赵若涵
卢方舟
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Xiongan New Area Power Supply Company State Grid Hebei Electric Power Co
Nari Technology Co Ltd
State Grid Electric Power Research Institute
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Xiongan New Area Power Supply Company State Grid Hebei Electric Power Co
Nari Technology Co Ltd
State Grid Electric Power Research Institute
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Publication of CN112290672A publication Critical patent/CN112290672A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • 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
    • H02J13/00028—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 involving the use of Internet protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/06—Management of faults, events, alarms or notifications
    • H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
    • H04L41/0663—Performing the actions predefined by failover planning, e.g. switching to standby network elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
    • 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
    • H02J2213/00—Indexing scheme relating to details of circuit arrangements for providing remote indication of network conditions of for circuit arrangements for providing remote control of switching means in a power distribution network
    • 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)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Computing Systems (AREA)
  • General Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Small-Scale Networks (AREA)

Abstract

The invention discloses a power distribution network control system and method based on a node coding mode, wherein the system comprises a controller and a converter; a first communication loop and a second communication loop are arranged between the controller and the converter; the first communication loop comprises a switch, one end of the switch is connected with the controller through a network cable, and the other end of the switch is connected with the converter through the network cable, so that communication protocol communication of the controller and the converter based on the Ethernet is realized; the first communication loop comprises a hard wire, one end of the hard wire is connected with the controller, and the other end of the hard wire is connected with the converter; when the first communication loop breaks down or the converter has an emergency, the converter and the controller communicate based on a preset node coding mode to complete control of the power distribution network. The invention can improve the operation stability of the distribution network and improve the power consumption experience and the power supply quality of power users.

Description

Power distribution network control system and method based on node coding mode
Technical Field
The invention belongs to the technical field of power distribution and utilization, and particularly relates to a power distribution network control system and method based on a node coding mode.
Background
The application of the low-voltage direct-current technology in a power distribution and utilization system aims to manage the flow of the direct-current system tide by directly interconnecting uncontrollable loads, power supplies and the like in a plurality of low-voltage systems and utilizing the characteristic that the direct-current tide is controllable, and realize the stable operation of the uncontrollable loads and power supplies in an alternating-current power grid through alternating current and direct current interaction. In order to realize stable operation, a power distribution area communication system is required to provide a large amount of distribution network state data, measurement data and control information data, and support is provided for quick control of the system. Because the number of the measuring points to be monitored in the power distribution area is large, and the network structure is complex, the construction of a communication system is difficult to meet the requirements of high reliability and wide coverage area. In addition, a communication system failure may have a great influence on the stable control of the dc system.
Disclosure of Invention
In order to solve the problems, the invention provides a power distribution network control system and method based on a node coding mode, which can improve the operation stability of a power distribution network and improve the power consumption experience and the power supply quality of power users.
In order to achieve the technical purpose and achieve the technical effects, the invention is realized by the following technical scheme:
in a first aspect, the invention provides a power distribution network control system based on a node coding mode, which comprises a controller and a converter; a first communication loop and a second communication loop are arranged between the controller and the converter;
the first communication loop comprises a switch, one end of the switch is connected with the controller through a network cable, and the other end of the switch is connected with the converter through the network cable, so that communication protocol communication of the controller and the converter based on the Ethernet is realized;
the second communication loop comprises a hard wire, one end of the hard wire is connected with the controller, and the other end of the hard wire is connected with the converter;
when the first communication loop fails or the converter has an emergency, the converter and the controller communicate with each other by using the second communication loop based on a preset node coding mode to complete the control of the power distribution network.
Optionally, when the first communication loop fails, the converter and the controller communicate based on the second communication loop, and the specific communication process is as follows:
when the controller t 0 Constantly judging the fault of the first communication loop, enabling and issuing a pulse signal;
when the converter receives the pulse signal, internal control logic is rapidly switched, t 1 Uploading a first coded signal at a moment;
after the controller receives the coded signal uploaded by the converter, the coded signal is decoded, calculated and processed to generate a corresponding control instruction t 2 Issuing a corresponding second coding signal at any moment;
when the converter receives a second coding signal sent by the controller and the pulse signal is always at an enable bit, the converter acts according to the second coding signal and keeps the action state until the received coding signal sent by the controller changes;
when the local information collected by the converter changes, the converter is at t 3 Uploading a third coded signal at a moment;
after receiving the third encoding signal, the controller performs decoding calculation processing on the third encoding signal to generate a corresponding control instruction t 4 And sending the corresponding fourth coded signal at any moment.
Optionally, when the converter has an emergency, the converter and the controller communicate based on the second communication loop, and the specific communication process is as follows:
said current transformer is at t 0 Judging a local emergency at any moment, and actively sending a fifth coding signal to the controller;
after the controller receives the fifth coded signal, searching a corresponding emergency treatment measure and generating a corresponding sixth coded signal t 1 The sixth coded signal and the pulse signal are issued at the same time;
the converter acts according to the sixth coded signal, uploads the seventh coded signal for a retention time exceeding 1 Ethernet communication period, and then t 2 The converter clears the uploaded seventh coded signal at any moment;
t after the controller monitors that the converter clears the uploaded seventh coded signal 3 And the time controller simultaneously clears the pulse signal and the issued sixth coding signal, and the converter and the controller are switched back to the communication control mode based on the Ethernet.
Optionally, the emergency event includes a transient emergency event and a permanent emergency event.
Optionally, the encoding signal sent by the controller and the encoding signal uploaded by the converter are both generated based on an encoding rule agreed between the controller and the converter.
In a second aspect, the present invention provides a power distribution network control method based on a node coding scheme, including:
monitoring the states of a first communication loop and a converter, wherein the first communication loop comprises a switch, one end of the switch is connected with a controller through a network cable, and the other end of the switch is connected with the converter through the network cable, so that the controller and the converter realize communication based on the communication protocol of the Ethernet;
when the first communication loop fails or the converter has an emergency, the converter and the controller are controlled to communicate by using a second communication loop based on a preset node coding mode to complete control of the power distribution network, wherein the second communication loop comprises a hard wire, one end of the hard wire is connected with the controller, and the other end of the hard wire is connected with the converter.
Optionally, when the first communication loop fails, the converter and the controller communicate based on the second communication loop, and the specific communication process is as follows:
when the controller t 0 Judging the fault of the first communication loop at all times, enabling and issuing a pulse signal;
when the converter receives the pulse signal, internal control logic is rapidly switched, t 1 Uploading a first coded signal at a moment;
after the controller receives the coded signal uploaded by the converter, the coded signal is decoded, calculated and processed to generate a corresponding control instruction t 2 Issuing a corresponding second coding signal at any moment;
when the converter receives a second coding signal sent by the controller and the pulse signal is always at an enable bit, the converter acts according to the second coding signal and keeps the action state until the received coding signal sent by the controller changes;
when the local information collected by the converter changes, the converter is at t 3 Uploading a third coded signal at a moment;
after receiving the third coded signal, the controller performs decoding calculation processing on the third coded signal to generate a corresponding control instruction t 4 And issuing a corresponding fourth coding signal at any moment.
Optionally, when the converter has an emergency, the converter and the controller communicate based on the second communication loop, and the specific communication process is as follows:
said current transformer is at t 0 Constantly judging local emergency and activelyTransmitting a fifth encoded signal to the controller;
after the controller receives the fifth coded signal, searching a corresponding emergency treatment measure and generating a corresponding sixth coded signal t 1 The sixth coded signal and the pulse signal are issued at the same time;
the converter acts according to the sixth coded signal and uploads the seventh coded signal for a retention time exceeding 1 Ethernet communication period t 2 The converter clears the uploaded seventh coded signal at any moment;
t after the controller monitors that the converter clears the uploaded seventh coded signal 3 And the time controller simultaneously clears the pulse signal and the issued sixth coding signal, and the converter and the controller are switched back to the communication control mode based on the Ethernet.
Optionally, the emergency event includes a transient emergency event and a permanent emergency event.
Optionally, the encoding signal sent by the controller and the encoding signal uploaded by the converter are both generated based on an encoding rule agreed between the controller and the converter.
Compared with the prior art, the invention has the beneficial effects that:
the distribution network control system and method based on the node coding mode provided by the invention provide a backup communication mode which can be used for distribution network operation control, and can also improve the response speed to distribution network emergency, the distribution network operation stability, the power consumption experience of power users and the power supply quality.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a distribution network control system based on a node coding mode;
FIG. 2 is a schematic diagram of a standby communication mode after an Ethernet communication failure;
fig. 3 is a schematic diagram of an emergency response mode in the face of an emergency.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
Example 1
In an embodiment of the present invention, a power distribution network control system based on a node coding scheme is provided, as shown in fig. 1, the system includes a controller and a converter (such as an AC/DC converter), which communicate with each other in two ways: ethernet communications and hard wiring. Under the Ethernet communication mode, the communication between the controller and the converter is realized based on the communication protocol of the Ethernet; and the controller and the converter are communicated through a hard connecting wire in a hard-wired mode. The output signal of the controller at least comprises 1 path of pulse signal and a plurality of paths of output signals for realizing the coding protocol of the controller and the converter, and the uploading of the local information of the converter is realized.
Specifically, the power distribution network control system based on the node coding mode comprises a controller and a converter, wherein a first communication loop and a second communication loop are arranged between the controller and the converter;
the first communication loop comprises a switch, one end of the switch is connected with the controller through a network cable, and the other end of the switch is connected with the converter through the network cable, so that the communication of the controller and the converter based on the communication protocol of the Ethernet is realized;
the second communication loop comprises a hard wire, one end of the hard wire is connected with the controller, and the other end of the hard wire is connected with the converter;
when the first communication loop fails or the converter has an emergency, the converter and the controller communicate by using the second communication loop based on a preset node coding mode to complete the control of the power distribution network.
In a specific implementation manner of the embodiment of the present invention, as shown in fig. 2, when the first communication loop fails, the system is in a standby communication mode after a communication failure occurs in ethernet, the converter and the controller communicate based on the second communication loop, and the specific communication process is as follows:
when the controller t is 0 Judging the fault of the first communication loop at all times, enabling and issuing a pulse signal;
when the converter receives the pulse signal, internal control logic is rapidly switched, t 1 Uploading a first coded signal at a moment; in the embodiment of the invention, the converter has different response priorities for different signals, the priority of the signal transmitted in a node mode is higher than that of the signal transmitted by the Ethernet, and the rapid switching internal control logic refers to switching from the Ethernet transmission mode to the node transmission mode between the converter and the controller; the first coded signal is converter local information (equivalent to telemetry);
after the controller receives the coded signal uploaded by the converter, the coded signal is decoded, calculated and processed to generate a corresponding control instruction t 2 Issuing a corresponding second coding signal at any moment; the second coded signal is a control command (equivalent to a remote regulation);
when the converter receives a second coded signal sent by the controller and the ripple signal is always at an enable bit, the converter acts according to the second coded signal (i.e. acts according to an agreed coded signal corresponding instruction, such as power on/off, a power/voltage change instruction, and the like), and keeps an action state until the received coded signal sent by the controller changes (i.e. when uploaded local information is different, the instruction will change, and both parties specifically need to agree); in the embodiment of the invention, the enable bit is kept effective so as to avoid frequent change of the output signal after the local information is changed;
when the local information collected by the converter changes, the converter is at t 3 Uploading a third code signal at any moment, namely when the local information of the converter is changed, the uploading code needs to be changed, and the control is realizedMaking an adjustment action providing information;
after receiving the third coded signal, the controller performs decoding calculation processing on the third coded signal to generate a corresponding control instruction t 4 And issuing a corresponding fourth coding signal at any moment.
Because the communication mode is a means for realizing the control of the direct current distribution network, the standby communication mode after the communication fault of the Ethernet can meet the requirement that the direct current system can still normally operate after the communication fault of the Ethernet occurs.
In another specific implementation manner of the embodiment of the invention, because the communication speed is low in an ethernet manner, the communication speed is high in a node manner for disturbance which needs quick response and cannot be timely acted; for disturbance with limited category (overcurrent/overvoltage) requiring quick response, coded transmission can be performed through limited nodes, as shown in fig. 3, when an emergency occurs in the converter, the system is in an emergency response mode in the face of the emergency, the converter and the controller communicate based on the second communication loop, the emergency includes a transient emergency and a permanent emergency, and the specific communication process is as follows:
said current transformer is at t 0 Judging a local emergency at any moment, and actively sending a fifth coding signal to the controller;
after the controller receives the fifth coded signal, searching a corresponding emergency treatment measure and generating a corresponding sixth coded signal t 1 The sixth coded signal and the pulse signal are issued at the same time;
the converter acts according to the sixth coded signal and uploads the seventh coded signal for a retention time exceeding the Ethernet communication period t 2 The converter clears the uploaded seventh coded signal at any moment; the step is used for solving the problems that the response priority of the coded signal is high, if the coded signal and the Ethernet signal exist at the same time, the coded signal can be executed, and because the disturbance is instantaneous, the coded signal needs to be recovered to a normal mode after the disturbance is finished; in the embodiment, as the emergency response mode in the face of an emergency, the active uploading signal of the converter should consider the transient emergencyIncidents and permanent emergencies. The controller may not capture the transient process in the transient emergency, and the uploading code signal should be kept for at least 1 Ethernet communication period; under a permanent emergency, the uploading coded signal should keep at least 1 Ethernet communication cycle, so as to ensure that the local information can be transmitted to the controller through the Ethernet to make a more accurate control action;
t after the controller monitors that the converter clears the uploaded seventh coded signal 3 And the moment controller simultaneously clears the pulse signal and the issued sixth coding signal, and the converter and the controller are switched back to the communication control mode based on the Ethernet.
In the embodiment of the invention, the coding signals transmitted by the controller and the coding signals uploaded by the converter are generated based on the coding rule agreed between the controller and the converter, and the coding rule is set according to the actual situation.
Example 2
The embodiment of the invention provides a power distribution network control method based on a node coding mode, which comprises the following steps:
(1) Monitoring the states of a first communication loop and a converter, wherein the first communication loop comprises a switch, one end of the switch is connected with a controller through a network cable, and the other end of the switch is connected with the converter through the network cable, so that the controller and the converter realize communication based on the communication protocol of the Ethernet;
(2) When the first communication loop fails or the converter has an emergency, the converter and the controller are controlled to communicate by using a second communication loop based on a preset node coding mode to complete the control of the power distribution network, the second communication loop comprises a hard wire, one end of the hard wire is connected with the controller, and the other end of the hard wire is connected with the converter.
In a specific implementation manner of the embodiment of the present invention, as shown in fig. 2, when the first communication loop fails, the system is in a standby communication mode after a communication failure occurs in ethernet, the converter and the controller communicate based on the second communication loop, and the specific communication process is as follows:
when the controller t 0 Judging the fault of the first communication loop at all times, enabling and issuing a pulse signal;
when the converter receives the pulse signal, the internal control logic is rapidly switched, t 1 Uploading a first coded signal at a moment; in the embodiment of the invention, the converter has different response priorities for different signals, and the signal priority transmitted in a node mode is higher than the signal transmitted by the Ethernet; the rapid switching internal control logic refers to switching from an Ethernet transmission mode to a node transmission mode between the converter and the controller; the first coded signal is converter local information (equivalent to telemetry);
after the controller receives the coded signal uploaded by the converter, the coded signal is decoded, calculated and processed to generate a corresponding control instruction t 2 Issuing a corresponding second coding signal at any time; the second coded signal is a control command (equivalent to a remote regulation);
when the converter receives a second coded signal sent by the controller and the ripple signal is always at an enable bit, the converter acts according to the second coded signal (i.e. acts according to an agreed coded signal corresponding instruction, such as power on/off, a power/voltage change instruction, and the like), and keeps an action state until the received coded signal sent by the controller changes (i.e. when uploaded local information is different, the instruction will also change, and both parties are specifically required to agree); in the embodiment of the invention, the enable bit is kept effective so as to avoid frequent change of the output signal after the local information is changed;
when the local information collected by the converter changes, the converter is at t 3 Uploading a third encoding signal at any time, namely when the local information of the converter is changed, the uploading code needs to be changed, and providing information for controlling the adjustment action;
after receiving the third encoding signal, the controller performs decoding calculation processing on the third encoding signal to generate a corresponding control instruction t 4 And issuing a corresponding fourth coding signal at any moment.
Because the communication mode is a means for realizing the control of the direct current distribution network, the standby communication mode after the communication fault of the Ethernet can meet the requirement that the direct current system can still normally operate after the communication fault of the Ethernet occurs.
In another specific implementation manner of the embodiment of the invention, the communication speed is low in an ethernet manner, and the communication speed is high in a node manner for disturbance which needs quick response and cannot be timely acted; for disturbance with limited category (overcurrent/overvoltage) requiring quick response, coded transmission can be performed through limited nodes, as shown in fig. 3, when an emergency occurs in the converter, the system is in an emergency response mode in the face of the emergency, the converter and the controller communicate based on the second communication loop, the emergency includes a transient emergency and a permanent emergency, and the specific communication process is as follows:
said current transformer is at t 0 Judging a local emergency at any moment, and actively sending a fifth coding signal to the controller;
after the controller receives the fifth coded signal, searching a corresponding emergency treatment measure and generating a corresponding sixth coded signal t 1 The sixth coded signal and the pulse signal are issued at the same time;
the converter acts according to the sixth coded signal, uploads the seventh coded signal, and after the retention time of the seventh coded signal exceeds the Ethernet communication period, t 2 The converter clears the uploaded seventh coded signal at any moment; the step is used for solving the problems that the response priority of the coded signal is high, if the coded signal and the Ethernet signal exist at the same time, the coded signal can be executed, and because the disturbance is instantaneous, the coded signal needs to be recovered to a normal mode after the disturbance is finished; in the present embodiment, as the emergency response mode in the face of an emergency event, the converter actively uploads a signal in consideration of a transient emergency and a permanent emergency. The controller may not capture the transient process in the transient emergency, and the uploading coded signal should be maintained for at least 1 Ethernet communication period; in case of permanent emergency, the uploading code signal should be maintained for at least 1 Ethernet communication cycleThe local information is ensured to be transmitted to the controller through the Ethernet, and then more accurate control action can be made;
t after the controller monitors that the converter clears the uploaded seventh coded signal 3 And the time controller simultaneously clears the pulse signal and the issued sixth coding signal, and the converter and the controller are switched back to the communication control mode based on the Ethernet.
In the embodiment of the invention, the coding signals transmitted by the controller and the coding signals uploaded by the converter are generated based on the coding rule agreed between the controller and the converter, and the coding rule is set according to the actual situation.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (8)

1. A power distribution network control system based on a node coding mode is characterized by comprising a controller and a converter; a first communication loop and a second communication loop are arranged between the controller and the converter;
the first communication loop comprises a switch, one end of the switch is connected with the controller through a network cable, and the other end of the switch is connected with the converter through the network cable, so that communication protocol communication of the controller and the converter based on the Ethernet is realized; the second communication loop comprises a hard wire, one end of the hard wire is connected with the controller, and the other end of the hard wire is connected with the converter;
when the first communication loop fails or the converter has an emergency, the converter and the controller communicate by using the second communication loop based on a preset node coding mode to complete the control of the power distribution network; when the first communication loop fails, the converter and the controller communicate based on the second communication loop, and the specific communication process is as follows:
when the controller t 0 Judging the fault of the first communication loop at all times, enabling and issuing a pulse signal;
when the converter receives the pulse signal, internal control logic is rapidly switched, t 1 Uploading a first coded signal at a moment; after the controller receives the coded signal uploaded by the converter, the coded signal is decoded, calculated and processed to generate a corresponding control instruction t 2 Issuing a corresponding second coding signal at any moment;
when the converter receives a second coding signal sent by the controller and the pulse signal is always at an enable bit, the converter acts according to the second coding signal and keeps the action state until the received coding signal sent by the controller changes;
when the local information collected by the converter changes, the converter is at t 3 Uploading a third coded signal at a moment;
after receiving the third encoding signal, the controller performs decoding calculation processing on the third encoding signal to generate a corresponding control instruction t 4 And issuing a corresponding fourth coding signal at any moment.
2. The system according to claim 1, wherein the system comprises: when the converter has an emergency, the converter and the controller communicate based on the second communication loop, and the specific communication process is as follows:
said current transformer is at t 0 Judging a local emergency at any moment, and actively sending a fifth coding signal to the controller;
after the controller receives the fifth coded signal, searching for a corresponding emergency treatment measure and generating a corresponding sixth coded signal, t 1 The sixth coded signal and the pulse signal are issued at the same time;
the converter rootActing according to the sixth coding signal, uploading the seventh coding signal for a retention time exceeding 1 Ethernet communication period, and then t 2 The converter clears the uploaded seventh coded signal at any moment;
after the controller monitors that the converter clears the uploaded seventh coding signal, t 3 And the time controller simultaneously clears the pulse signal and the issued sixth coding signal, and the converter and the controller are switched back to the communication control mode based on the Ethernet.
3. The system according to claim 2, wherein the system comprises: the emergency events comprise transient emergency events and permanent emergency events.
4. The system according to any one of claims 1 to 3, wherein the system comprises: the coding signal issued by the controller and the coding signal uploaded by the converter are generated based on the coding rule agreed between the controller and the converter.
5. A power distribution network control method based on a node coding mode is characterized by comprising the following steps:
monitoring the states of a first communication loop and a converter, wherein the first communication loop comprises a switch, one end of the switch is connected with a controller through a network cable, and the other end of the switch is connected with the converter through the network cable, so that the controller and the converter realize communication based on the communication protocol of the Ethernet;
when the first communication loop fails or the converter has an emergency, controlling the converter and the controller to communicate by using a second communication loop based on a preset node coding mode to complete the control of the power distribution network, wherein the second communication loop comprises a hard wire, one end of the hard wire is connected with the controller, and the other end of the hard wire is connected with the converter;
when the first communication loop fails, the converter and the controller communicate based on the second communication loop, and the specific communication process is as follows:
when the controller t is 0 Judging the fault of the first communication loop at all times, enabling and issuing a pulse signal;
when the converter receives the pulse signal, internal control logic is rapidly switched, t 1 Uploading a first coded signal at a moment; after the controller receives the coded signal uploaded by the converter, the coded signal is decoded, calculated and processed to generate a corresponding control instruction t 2 Issuing a corresponding second coding signal at any time;
when the converter receives a second coding signal issued by the controller and the pulse signal is always at an enable bit, the converter acts according to the second coding signal and keeps an action state until the received coding signal issued by the controller changes;
when the local information collected by the converter changes, the converter is at t 3 Uploading a third coded signal at a moment;
after receiving the third encoding signal, the controller performs decoding calculation processing on the third encoding signal to generate a corresponding control instruction t 4 And issuing a corresponding fourth coding signal at any moment.
6. The power distribution network control method based on the node coding mode according to claim 5, wherein: when the converter has an emergency, the converter and the controller communicate based on the second communication loop, and the specific communication process is as follows:
said current transformer is at t 0 Judging a local emergency at any moment, and actively sending a fifth coding signal to the controller;
after the controller receives the fifth coded signal, searching a corresponding emergency treatment measure and generating a corresponding sixth coded signal t 1 The sixth coded signal and the pulse signal are issued at the same time;
the converter acts according to the sixth coded signal and uploads the seventh coded signal for a retention time exceeding 1 Ethernet communication period t 2 The converter clears the uploaded seventh coded signal at any moment;
t after the controller monitors that the converter clears the uploaded seventh coded signal 3 And the time controller simultaneously clears the pulse signal and the issued sixth coding signal, and the converter and the controller are switched back to the communication control mode based on the Ethernet.
7. The power distribution network control method based on the node coding mode according to claim 5, wherein: the emergency event comprises a transient emergency event and a permanent emergency event.
8. The power distribution network control method based on the node coding mode according to claim 5, wherein: the coding signal issued by the controller and the coding signal uploaded by the converter are generated based on the coding rule agreed between the controller and the converter.
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Publication number Priority date Publication date Assignee Title
CN202711233U (en) * 2012-04-06 2013-01-30 济南迈越信息科技有限公司 Storage system for digitization transformer substation network communication recording unit
CN103023558A (en) * 2012-12-05 2013-04-03 中国船舶重工集团公司第七一九研究所 Transmission system for operation control information of marine power plant
CN105406473A (en) * 2015-12-29 2016-03-16 国网辽宁省电力有限公司 Uniform processing method and system of power distribution network faults on the basis of software defined network

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202711233U (en) * 2012-04-06 2013-01-30 济南迈越信息科技有限公司 Storage system for digitization transformer substation network communication recording unit
CN103023558A (en) * 2012-12-05 2013-04-03 中国船舶重工集团公司第七一九研究所 Transmission system for operation control information of marine power plant
CN105406473A (en) * 2015-12-29 2016-03-16 国网辽宁省电力有限公司 Uniform processing method and system of power distribution network faults on the basis of software defined network

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