Fusion method and system of passive optical network and electric power dedicated wireless local area network

Abstract

The invention belongs to the technical field of optical and wireless converged communication, and discloses a method and a system for fusing a passive optical network and a wireless local area network special for electric power. The fusion method comprises the following steps: deploying a passive optical network at a wired side; in the passive optical network, PON network slices and combo PON isolation are adopted, and physical isolation of forwarding traffic in different security areas is realized through independent physical wavelengths and ports; deploying an electric power dedicated wireless local area network at a wireless side; service data of different security partitions borne by the electric power dedicated wireless local area network are transmitted through different wireless frequency bands; each secure partition in a power-dedicated wireless local area network can be mapped to one or more secure zones in a passive optical network. According to the technical scheme of the invention, real-time communication control among multiple controllers during grid connection of multiple generator cars is realized, and the technical problem that the security of a public network adopted in the prior art is insufficient and the delay jitter is large is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical and wireless fusion communication, and in particular relates to a fusion method and system of a passive optical network and a power-specific wireless local area network. Background Art

[0002] In recent years, non-stop maintenance of distribution network, emergency disaster repair, holiday guarantee, major events guarantee and other tasks have gradually become the key tasks of power supply guarantee of distribution network. For example, the above key tasks require mobile diesel generator sets to generate electricity, which are connected to ring network cabinets or overhead lines through 10kV / 0.4V cabinets, flexible cables and other equipment, and incorporated into the distribution network as distributed power supply. The power generation vehicle with integrated series equipment has become an important equipment for distribution network supply guarantee production. For further example, the power grid currently mainly uses power generation vehicles with two voltage levels of 0.4kV and 10kV; among them, the low-voltage power generation vehicle is 0.4kV, which can only guarantee one 10kV transformer, point-to-point access to the low-voltage load side, such as low-voltage overhead lines, transformer low-voltage rooms, distribution room low-voltage cabinets, etc., which are suitable for the power supply needs of small to medium-sized equipment or facilities; the medium-voltage power generation vehicle is 10kV, which can provide power for multiple distribution transformers, and takes the 10kV distribution network main network line as the access point, which can meet the power supply needs of large facilities, factories or distribution network areas.

[0003] There are four main working modes for generator trucks to connect to the power grid to ensure power supply, including: (1) Single-machine power outage access and power generation: After a line fault trips and a power outage, the generator truck is connected to the line behind the power outage to generate power alone; (2) Single-machine grid-connected and live-connected power generation: When the line equipment is planned for maintenance, the generator truck is connected to the grid with power alone and generates power alone; (3) Multiple-machine parallel power outage access and power generation: After a line fault trips and a power outage, multiple medium-voltage generator trucks are connected in parallel through communication cables, and the power outage is connected to power generation; (4) Multiple-machine parallel power grid-connected and live-connected power generation: When the line equipment is planned for maintenance, multiple generator trucks are connected in parallel through communication cables to generate power with power alone.

[0004] The power generation vehicle will form a parallel and grid-connected system at the power supply site, which is mainly composed of a generator set, an intelligent control system, and an intelligent monitoring system for power supply. The intelligent generator control unit (IG-CU) and the intelligent mains control unit (IM-CU) collect the voltage signals, current and phase sequence signals of the mains and the generator set, and compare the voltage and frequency of the mains and the generator set as well as the difference in the initial phase angle of the voltage to adjust the speed of the diesel engine and the voltage of the generator, so as to finally synchronize the generator sets and realize parallel operation. After parallel operation, the power management of multiple generator sets communicates through the CAN (Controller Area Network) bus to achieve data integration, and overall control of all circuit breakers to be reasonably and consistently turned on and off, so as to realize multi-machine parallel grid connection without power outage and live operation. The intelligent monitoring system for power supply establishes communication between the on-board gateway and the server in the computer room of the municipal company, collects real-time data on site, determines whether the power supply vehicle is in a normal state during the grid connection process, realizes the protection, correction and early prediction of equipment failures, and ensures the stable operation of the power supply vehicle; for example, Figure 1 shown.

[0005] There are mainly two types of communication services in the above-mentioned power distribution and supply guarantee scenario. The first type of communication service is the industrial field CAN bus communication between the IM-CU and IG-CU intelligent controllers; among them, if the power generation vehicles are far away, in different distribution station areas or near the distribution station room, the power generation vehicles will not be able to communicate and interconnect using the "wired bus"; if wireless communication is used, the frequency, voltage, and phase of the generator and the power grid must be consistent before they can be incorporated, and the coordination of control commands of each controller requires ultra-low latency and ultra-low jitter communication transmission; wireless public networks have great risks in terms of security, reliability, and certainty. The second type of communication service is data communication between the vehicle gateway and the server in the city computer room; among them, wireless public networks are generally used to transmit monitoring business data back, but the wireless public network base stations around the supply guarantee site are at risk of power failure at any time; when risks arise, the wireless public network cannot guarantee the high reliability and stable transmission of on-site monitoring data during the entire operation period. Summary of the invention

[0006] The purpose of the present invention is to provide a method and system for integrating a passive optical network with a power-specific wireless local area network to solve one or more of the above-mentioned technical problems. The technical solution provided by the present invention can avoid the technical difficulties of insufficient security and large delay jitter of the public network, realize real-time communication control between multiple controllers when multiple power generators are connected to the grid, and solve the problems existing in the existing communication technology for safe grid connection of power generators.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention provides a method for integrating a passive optical network with a power-specific wireless local area network, comprising the following steps: Deploy a passive optical network on the wired side; in the passive optical network, PON network slicing and combo PON isolation are used to achieve physical isolation of forwarding traffic in different security areas through separate physical wavelengths and ports; Deploy a power-specific wireless LAN on the wireless side; transmit the business data of different security partitions carried by the power-specific wireless LAN through different wireless frequency bands; Wherein, each security zone in the power-dedicated wireless local area network can be mapped to one or more security areas in the passive optical network.

[0008] A further improvement of the fusion method of the present invention is that: The power-specific wireless LAN is a deterministic wireless LAN, which is constructed using waveform preamble customization, wireless air interface fixed time slot, wired-wireless link layer chip direct strong real-time and data signaling full MAC frame encryption technology, and deploys communication resources across time, frequency and space domains in a diversity and redundancy manner.

[0009] A further improvement of the fusion method of the present invention is that: In the process of deploying communication resources across time, frequency and space domains using diversity and redundancy, time slot scheduling and periodic data processing mechanisms are used in the time domain, dual-route dual-access point access is used in the space domain, and adaptive frequency hopping transmission is used in the frequency domain.

[0010] A further improvement of the fusion method of the present invention is that: The specific manner in which the business data of different security partitions carried by the power-dedicated wireless LAN is transmitted through different wireless frequency bands is that the business data of different security partitions carried by the power-dedicated wireless LAN is transmitted through two different wireless frequency bands, which are 2.4 GHz and 5.1 GHz respectively.

[0011] A further improvement of the fusion method of the present invention is that: The passive optical network and the power-specific wireless local area network are under unified management and control; wherein, The passive optical network includes an optical line terminal and multiple optical network units, and the power-specific wireless local area network includes multiple access points and a wireless network controller; wherein the optical line terminal is connected to multiple optical network unit devices through optical fibers, and the access point of the power-specific wireless local area network establishes a connection with the optical network unit through an Ethernet interface; the optical line terminal remotely manages and controls the optical network unit and the gateway connected to the optical network unit and the access point of the power-specific wireless local area network through an ONU management and control interface channel.

[0012] A further improvement of the fusion method of the present invention is that: In the power-dedicated wireless LAN, the upper-layer media access control function of the slave device is integrated into the master device, and the slave device retains the queue management and user management functions of the power-dedicated wireless LAN, and the retained functions are managed in a unified manner to achieve unified queue and user management of the backhaul passive optical network and the power-dedicated wireless LAN.

[0013] The present invention provides a fusion system of a passive optical network and a power-specific wireless local area network, comprising: A passive optical network is used to be deployed on the wired side; in the passive optical network, PON network slicing and comboPON isolation are used to achieve physical isolation of forwarding traffic in different security areas through separate physical wavelengths and ports; A power-specific wireless local area network is used to be deployed on the wireless side; the business data of different security partitions carried by the power-specific wireless local area network is transmitted through different wireless frequency bands; Wherein, each security zone in the power-dedicated wireless local area network can be mapped to one or more security areas in the passive optical network.

[0014] A further improvement of the fusion system of the present invention is that: The power-specific wireless LAN is a deterministic wireless LAN, which is constructed using waveform preamble customization, wireless air interface fixed time slot, wired-wireless link layer chip direct strong real-time and data signaling full MAC frame encryption technology, and deploys communication resources across time, frequency and space domains in a diversity and redundancy manner.

[0015] A further improvement of the fusion system of the present invention is that: In the process of deploying communication resources across time, frequency and space domains using diversity and redundancy, time slot scheduling and periodic data processing mechanisms are used in the time domain, dual-route dual-access point access is used in the space domain, and adaptive frequency hopping transmission is used in the frequency domain.

[0016] A further improvement of the fusion system of the present invention is that: The specific manner in which the business data of different security partitions carried by the power-dedicated wireless LAN is transmitted through different wireless frequency bands is that the business data of different security partitions carried by the power-dedicated wireless LAN is transmitted through two different wireless frequency bands, which are 2.4 GHz and 5.1 GHz respectively.

[0017] A further improvement of the fusion system of the present invention is that: The passive optical network and the power-specific wireless local area network are under unified management and control; wherein, The passive optical network includes an optical line terminal and multiple optical network units, and the power-specific wireless local area network includes multiple access points and a wireless network controller; wherein the optical line terminal is connected to multiple optical network unit devices through optical fibers, and the access point of the power-specific wireless local area network establishes a connection with the optical network unit through an Ethernet interface; the optical line terminal remotely manages and controls the optical network unit and the gateway connected to the optical network unit and the access point of the power-specific wireless local area network through an ONU management and control interface channel.

[0018] A further improvement of the fusion system of the present invention is that: In the power-dedicated wireless LAN, the upper-layer media access control function of the slave device is integrated into the master device, and the slave device retains the queue management and user management functions of the power-dedicated wireless LAN, and the retained functions are managed in a unified manner to achieve unified queue and user management of the backhaul passive optical network and the power-dedicated wireless LAN.

[0019] Compared with the prior art, the present invention has the following beneficial effects: In the method for integrating a passive optical network and a power-dedicated wireless local area network provided by the present invention, the wired side adopts passive optical network PON technology, the wireless side adopts power-dedicated wireless local area network EPWL technology, and a wireless-wired isolation technology is proposed to improve network security and reliability and reduce network deployment costs; among them, in the wireless-wired isolation technology, the isolation method of different working frequency bands of the power-dedicated wireless local area network EPWL is integrated by adopting PON network slicing and combo PON isolation technology, thereby realizing safe and reliable transmission of power services in different security zones.

[0020] In the preferred technical scheme of the present invention, a deterministic wireless LAN technology is further proposed, which adopts technologies such as waveform preamble sequence customization, fixed time slot of wireless air interface, strong real-time direct access of wired-wireless link layer chip, and full MAC frame encryption of data signaling to achieve the customization capability and high security and reliability capability of the power-specific wireless LAN, and adopts diversity and redundancy to deploy communication resources across time, frequency and space domains to ensure the latency and reliability of EPWL.

[0021] In the preferred technical solution of the present invention, a unified management and control technology is further proposed, and the passive optical network and the power-specific wireless LAN EPWL are uniformly managed to improve the communication professional management capability and business guarantee capability; in addition, the upperMAC function of EPWL is unified into the main device, which can improve the network communication performance and reduce the network switching delay. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below; obviously, the drawings described below are some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a schematic diagram of the principle of the generator vehicle parallel connection and grid connection system in the power distribution and supply guarantee scenario in the prior art; Figure 2 It is a flow chart of a method for integrating a passive optical network and a power-specific wireless local area network in an embodiment of the present invention; Figure 3 It is a schematic diagram of a fusion system of a passive optical network and a power-specific wireless local area network in an embodiment of the present invention; Figure 4 It is a schematic diagram of a network architecture of a fusion system of a passive optical network and a power-specific wireless local area network in an embodiment of the present invention; Figure 5 It is a schematic diagram of the networking architecture of a passive optical network in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments and technical solutions are only part of the embodiments of the present invention, not all of the embodiments.

[0025] All other embodiments obtained by those of ordinary skill in the art without creative work based on the technical solutions disclosed in the embodiments of the present invention belong to the scope of protection of the present invention. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device including a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0026] See also Figure 2 The embodiment of the present invention provides a method for integrating a passive optical network with a power-specific wireless local area network, comprising the following steps: Step 1: deploy a passive optical network (PON) on the wired side; in the passive optical network, PON network slicing and combined passive optical network (combo PON) isolation technology are used to achieve physical isolation of forwarding traffic in different security areas through separate physical wavelengths and ports; Step 2: deploy an electric power dedicated wireless local area network (EPWL) on the wireless side; the business data of different security partitions carried by the electric power dedicated wireless local area network is transmitted through different wireless frequency bands; Wherein, each security zone in the power-dedicated wireless local area network can be mapped to one or more security areas in the passive optical network.

[0027] In a specific exemplary technical solution, in step 2, the business data of different security partitions carried by the power-dedicated wireless LAN can be transmitted through two different wireless frequency bands, namely 2.4GHz and 5.1GHz, corresponding to the security areas provided in combo PON; explanatory, in the power-dedicated wireless LAN, the business data carried by different security partitions are transmitted through different wireless frequency bands, the purpose of which is to achieve isolation and security between business data. When these business data need to be transmitted through a passive optical network (such as Combo PON), the concept of security areas in Combo PON corresponds to it; in a specific exemplary technical solution, each security partition in the power-dedicated wireless LAN can be mapped to one or more security areas in ComboPON. Through the physical isolation means provided by Combo PON, it is ensured that the business data between different security partitions will not interfere with each other during the transmission process, that is, in actual applications, the security areas of Combo PON can be used to carry business data of different security levels in the power-dedicated wireless LAN.

[0028] The technical solution provided by the embodiment of the present invention aims to overcome the technical difficulties such as insufficient security and large delay jitter in the existing power generation vehicle grid-connected communication technology, especially in the scenario of multiple power generation vehicles being connected to the grid, to ensure efficient and real-time communication control between multiple controllers. In the traditional power generation vehicle grid-connected communication technology, the public network is often used for data transmission, which has problems such as high security risks and uncontrollable delay jitter. These problems not only affect the stability and reliability of the power generation vehicle grid connection, but also may pose a threat to the safe operation of the power grid. The new solution disclosed in the embodiment of the present invention effectively avoids the above technical difficulties, is particularly suitable for the scenario of multiple power generation vehicles being connected to the grid, and can ensure real-time and accurate communication control between the controllers of each power generation vehicle, thereby improving the efficiency and safety of the power generation vehicle grid connection. Specifically, the core of the technical solution of the embodiment of the present invention is that the network isolation technology is adopted, and through this technical means, the safe and reliable transmission of power services in different safety zones is realized; specifically, it integrates the PON network slicing technology and the combo PON isolation technology, and combines the isolation method of different working frequency bands of EPWL. To further explain, PON network slicing technology allows the creation of multiple logically independent network slices on the physical network, and each slice can be customized and optimized according to specific business needs, thereby ensuring isolation and non-interference between different services; combo PON isolation technology further enhances the isolation performance of the network, and realizes physical isolation by transmitting different business data on different PON ports or optical fibers; EPWL's different working frequency band isolation method utilizes the characteristics of wireless frequency bands to allocate services in different security zones to different frequency bands for transmission, thereby avoiding mutual interference and crosstalk; by adopting the above-mentioned network isolation technology, the present invention successfully realizes real-time communication control between multiple controllers when multiple generators are connected to the grid. This communication control method not only has extremely high security and reliability, but also can effectively reduce delay jitter and improve communication efficiency.

[0029] In addition, the technical solution of the embodiment of the present invention also has good scalability and flexibility. As the scale of grid connection of power generation vehicles continues to expand and business needs continue to change, new needs can be adapted by adjusting parameters such as network slicing, isolation mode, and wireless frequency band allocation. The technical solution of the embodiment of the present invention reduces dependence on the public network, reduces communication failures and safety hazards caused by public network problems, and provides a strong technical guarantee for the safe grid connection of power generation vehicles.

[0030] In one embodiment of the present invention, the electric power dedicated wireless LAN is a deterministic wireless LAN, which uses technologies such as waveform preamble customization, wireless air interface fixed time slot, wired-wireless link layer chip direct strong real-time and data signaling full MAC frame (media access control frame) encryption to build a highly secure and high-real-time wireless LAN; Communication resources are deployed across time, frequency, and space domains in a diversity and redundancy manner, including precise time slot scheduling and strict periodic data processing mechanism in the time domain, dual-route dual-AP access in the space domain, and adaptive frequency hopping transmission in the frequency domain, to achieve high-reliability transmission of the EPWL network.

[0031] Explanatory, the technical solution of the embodiment of the present invention adopts the waveform preamble customization technology means, which means that the wireless local area network can customize the waveform preamble part of the wireless signal according to specific needs, which helps to improve the recognition ability and compatibility of the network, and may enhance the anti-interference performance of the network. The wireless air interface fixed time slot technology means are adopted to ensure the timing accuracy and predictability of data transmission by allocating fixed time slots for wireless communication, which is the basis for achieving high real-time communication. The wired-wireless link layer chip direct strong real-time technology means are adopted to realize direct communication between the wired and wireless link layers, reduce the delay of data processing, and improve the real-time response capability of the system. The data signaling full MAC frame encryption technology means are adopted, and all data and signaling information are encrypted through the MAC frame, which provides a high level of data security protection to prevent data from being stolen or tampered with during transmission. By adopting diversity and redundancy technologies and deploying multiple communication paths or resources in different time, frequency and space domains, the fault tolerance and reliability of the network can be improved. Precise time slot scheduling and strict periodic data processing mechanisms in the time domain ensure that data is accurately transmitted within the predetermined time slot and follow a strict periodic data processing process to maintain high real-time and stability of the network. Dual-route dual-AP access in the space domain provides two independent routing paths and two access points (APs) to ensure communication continuity even if one path or AP fails. Adaptive frequency hopping transmission in the frequency domain dynamically selects the best frequency for data transmission according to the current wireless environment to avoid interference and improve communication quality.

[0032] In the above technical solution of the embodiment of the present invention, a deterministic wireless local area network technology is introduced in detail, which realizes a high-security, high-real-time and high-reliability wireless communication network through a series of innovative technical means.

[0033] In one embodiment of the present invention, the passive optical network and the power-dedicated wireless local area network are uniformly managed and controlled; wherein the passive optical network includes an optical line terminal and a plurality of optical network units; the power-dedicated wireless local area network includes a plurality of access points and a wireless network controller; The optical line terminal (OLT) is connected to multiple optical network units (ONU) devices through optical fibers; the access point (AP) of the power-specific wireless LAN is connected to the optical network unit through the Ethernet interface; The optical line terminal remotely manages and controls the optical network unit and the gateway and access point of the power-specific wireless LAN connected to the optical network unit through the ONU management and control interface (OMCI) channel; Integrate the upper MAC (Upper Media Access Control) function of the slave device of the power-dedicated wireless LAN into the master device, retain the queue management and user management functions of the power-dedicated wireless LAN, and put the management authority of these functions into a unified management and control system to achieve unified queue and user management of the backhaul PON and EPWL networks.

[0034] In the above technical solution of the embodiment of the present invention, the access point of the power-dedicated wireless LAN is connected to the optical network unit through a standard Ethernet interface. This connection method ensures the stability and efficiency of data transmission, and at the same time utilizes the wide compatibility and maturity of Ethernet technology. As the core device of the optical access network, the optical line terminal is connected to multiple optical network units through optical fibers. The optical line terminal uses the OMCI (ONU management and control interface) channel to realize remote management and control of the optical network unit and the gateway and access point of the power-dedicated wireless LAN connected through the optical network unit. This includes functions such as configuration management, performance monitoring, and fault diagnosis, which greatly improves the efficiency and flexibility of network management. In the EPWL network, the upper MAC function of the slave device (such as some AP or terminal device) is integrated into the master device (such as a core switch or controller). This integration simplifies the network architecture, reduces the communication overhead between devices, and improves the overall performance of the network. Although the upper MAC function is integrated, the EPWL network still retains the queue management and user management functions. The queue management ensures the priority and bandwidth allocation of the data flow, while the user management can be responsible for the user's authentication, authorization and billing (AAA), etc. In order to achieve unified management and control of backhaul PON and EPWL networks, the management rights of these functions are integrated into a unified management and control system. This system can span different network domains (such as PON and EPWL) and provide a consistent management interface and operation process, which greatly simplifies the work of network administrators and improves the efficiency and accuracy of network management.

[0035] See also Figure 3 The embodiment of the present invention provides a fusion system of a passive optical network and a power-specific wireless local area network, including: A passive optical network is used to be deployed on the wired side; in the passive optical network, PON network slicing and comboPON isolation technology are used to achieve physical isolation of forwarding traffic in different security areas through separate physical wavelengths and ports; A power-specific wireless local area network is used to be deployed on the wireless side; the business data of different security partitions carried by the power-specific wireless local area network is transmitted through different wireless frequency bands; Wherein, each security zone in the power-dedicated wireless local area network can be mapped to one or more security areas in the passive optical network.

[0036] The system provided by the embodiment of the present invention is applicable to emergency power supply scenarios of distribution networks, campus scenarios such as substations and converter stations, and scenarios requiring temporary power supply guarantee and emergency repairs.

[0037] See also Figure 4 and Figure 5 In the exemplary technical solution, the PON system adopts GPON (Gigabit Passive Optical Network) technology, the OLT equipment is deployed in the upper-level substation, and the access communication layer network element ONU is deployed in the distribution room / switch station / ring network cabinet to form a dual-bus protection network. The EPWL system adopts a centralized network architecture, in which some functions of the MAC layer are managed by the PON and wireless unified management system. In the present invention, the PON network slicing and combo PON isolation technology are used to integrate the isolation methods of different working frequency bands of the power-specific wireless LAN EPWL to achieve safe and reliable transmission of power services in different security zones; by adopting deterministic wireless security LAN technology, the customization capability and high security and reliability capability of the power-specific wireless LAN are achieved; by adopting unified management and control technology, the communication professional management capability and business assurance capability are improved.

[0038] Principle explanation: Under the background of dual carbon, a large number of distributed power sources and charging pile loads are connected to the distribution network, and the power monitoring system is sunk to the low-voltage power grid, presenting a large number of terminal equipment control and monitoring needs. The distribution network tends to be active, and the terminal devices of the medium and low voltage power grid have communication needs. Considering that the power grid is fully covered by optical fiber of 35kv and above, and some optical fiber of 10kV is extended, the power grid has basic optical cable and optical fiber resources, and also has communication needs for the terminal equipment of the medium and low voltage distribution network; therefore, a high-reliability, high-security, and coverage-enhanced FTTR to Grid technology is proposed; among them, the wired side still uses PON technology, and the wireless side uses power-specific wireless LAN EPWL technology, and proposes wireless-wired isolation technology, deterministic wireless LAN technology, and unified management and control technology. FTTG supports long-distance coverage, physical isolation, reliable services, security enhancement, and ODN visualized operation and maintenance, which can meet the emerging needs of distribution networks and the Internet of Things. To solve the grid-connected communication problem of power generators, we can build a power passive optical network based on the key "station room cabinet" resources in the 10kV distribution network, and use the power-specific wireless LAN for wireless extension coverage, thus realizing a wired and wireless power-specific network solution.

[0039] In a specific exemplary technical solution, in the emergency power supply scenario of the distribution network, multiple PGVs are temporarily connected to the distribution network, IM-CU and IG-CU are connected to PON through EPWL AP, and IM-CU obtains analog electrical quantities such as voltage, frequency, and phase from the distribution network through sensors. Subsequently, IG-CU performs collaborative calculations to adjust and control the onboard generator. The control process implements a virtual CAN bus on the optical wireless integrated network to achieve ultra-real-time and highly reliable collaborative control. At the same time, the analog signal data and high-definition monitoring video collected by the CU need to be transmitted back to the server in the data center of the urban power supply company. In addition, the communication and computing resources (such as frequency, wavelength, time slot, IP core, etc.) of the remote network and the local network must be physically isolated to meet the isolation requirements of multiple information security areas.

[0040] In terms of wired networks, the network architecture of power distribution fiber private networks based on GPON technology is as follows: Figure 5 As shown. The OLT equipment is deployed in the upper-level substation, and the access communication layer network element ONU is deployed in the distribution room / switch station / ring network cabinet to form a dual-bus protection network. According to the technical principles of the State Grid's fiber-optic private network construction, the number of cascades of the access communication layer network element ONU in a single bus of the PON network does not exceed 10 levels, and the two buses cover 20 access communication layer network elements. The maximum transmission distance of OLT and ONU is less than 40km. In the passive optical network (PON), two main isolation schemes are designed to meet the isolation of communication services. The first scheme is called Combo PON technology, which meets the key requirements of physical isolation of forwarding traffic in different security areas. This is achieved by using separate physical wavelengths and ports, thereby ensuring reliable isolation between two different security areas. The second scheme adopts PON network slicing technology, providing a three-layer slicing solution for the network management layer, network element device layer, and communication service layer. In order to meet the different requirements for service isolation and traffic forwarding quality in the production control security area, communication service level slicing can effectively distinguish and isolate the forwarding planes of ONU and OLT in the PON architecture. This method ensures differentiated traffic processing for different communication services, while realizing independent management and operation of different service flows and achieving closed-loop control.

[0041] In terms of wireless, the business data of different security partitions carried by the EPWL network can be transmitted through two different wireless frequency bands, namely 2.4GHz and 5.1GHz, corresponding to the security areas provided in Combo PON.

[0042] Relying on EPWL, we use technologies such as customized waveform preamble, fixed time slots on wireless air interfaces, strong real-time direct access of wired-wireless link layer chips, and full MAC frame encryption of data signaling to build a highly secure and real-time wireless LAN. In the "station room cabinet" where OUNs have been deployed, EPWL AP network elements are deployed, which are further connected to the wireless network controller through ONUs to achieve access, authentication, and encryption of the entire wireless network.

[0043] In order to ensure the determinism of latency and reliability, EPWL deploys communication resources across time, frequency and space domains in a diversity and redundancy manner. In the time domain, precise time slot scheduling and strict periodic data processing mechanisms are adopted. In the space domain, dual-route dual-AP access can be selected. In the frequency domain, the subcarrier energy indication of the service data request and the channel status of the idle channel are polled to achieve adaptive frequency hopping transmission based on the polling results. These measures ultimately achieve high-reliability transmission of the EPWL network.

[0044] The EPWL access point (AP) establishes a connection with the ONU through the Ethernet interface, and the OLT remotely manages and controls the ONU and the connected gateway and EPWL AP through the OMCI channel. The ME (Managed Entity) of the Ethernet data service is defined and configured through the OMCI management protocol to ensure the reliability and time certainty of the EPWL data service. In order to provide the best communication performance for different power application scenarios, it is necessary to consider integrating some functions of the power-specific wireless LAN EPWL into the C-WAN (centralized wireless LAN) architecture. The upper MAC of the EPWL slave device is integrated into the master device, and the EPWL queue management and user management functions are retained in the master device. The management authority of these functions is placed in the unified control system, which can realize that the backhaul PON and EPWL networks can uniformly execute queue and user management, and also support mapping queue priorities. Centralized user management helps improve network roaming performance. In the two types of services analyzed in the previous article, the two types of devices, the intelligent controller CAN bus terminal and the vehicle-mounted gateway, are adapted to the EPWL STA respectively to access the wireless-wired deterministic network. When the generator truck stops near the "station room cabinet" to prepare for power supply operations, it is also covered by the wireless signal of the EPWL AP. Both types of terminals can achieve wireless registration and access, and ultimately achieve local horizontal virtual CAN bus business carrying, as well as remote vertical data business carrying between the on-board gateway and the local city company server.

[0045] In summary, the number of smart terminals such as inspection robots, smart helmets, and drones in campus scenes such as substations and converter stations has increased sharply. Wired transmission has the problems of difficult laying, long construction period, lack of compatibility and flexibility. Wireless LAN coverage is required in the park, and the collected business data needs to be transmitted back through the PON network. The use of PON and power-specific wireless LAN fusion network can provide safe and reliable network communication capabilities. In the case of temporary power supply guarantee and emergency repair, medium and low voltage generators (PGV) must be included in the distribution network to provide users with continuous and reliable power supply. The frequency, voltage and phase of multiple PGV outputs must be highly real-time and reliably coordinated and controlled by the intelligent generator control unit (IG-CU) and the intelligent mains control unit (IM-CU) to ensure that the operating parameters of the PGV are consistent with the operating parameters of the distribution network, and the communication delay, reliability and jitter are very high. When multiple generators are generating electricity at the same time, the existing CAN bus cannot be wired. The use of PON and power-specific wireless LAN EPWL fusion network can provide network communication performance not lower than the CAN bus performance, which can solve the problem of large wireless public network delay jitter.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for integrating a passive optical network with a power-specific wireless local area network, characterized in that: The following steps are involved: Deploy a passive optical network on the wired side; in the passive optical network, PON network slicing and combo PON isolation are used to achieve physical isolation of forwarding traffic in different security areas through separate physical wavelengths and ports; Deploy a power-specific wireless LAN on the wireless side; transmit the business data of different security partitions carried by the power-specific wireless LAN through different wireless frequency bands; Wherein, each security zone in the power-dedicated wireless local area network can be mapped to one or more security areas in the passive optical network.

2. The method for integrating a passive optical network with a power-specific wireless local area network according to claim 1, characterized in that: The power-specific wireless LAN is a deterministic wireless LAN, which is constructed using waveform preamble customization, wireless air interface fixed time slot, wired-wireless link layer chip direct strong real-time and data signaling full MAC frame encryption technology, and deploys communication resources across time, frequency and space domains in a diversity and redundancy manner.

3. The method for integrating a passive optical network with a power-specific wireless local area network according to claim 2, characterized in that: In the process of deploying communication resources across time, frequency and space domains using diversity and redundancy, time slot scheduling and periodic data processing mechanisms are used in the time domain, dual-route dual-access point access is used in the space domain, and adaptive frequency hopping transmission is used in the frequency domain.

4. The method for integrating a passive optical network with a power-specific wireless local area network according to claim 1, characterized in that: The specific manner in which the business data of different security partitions carried by the power-dedicated wireless LAN is transmitted through different wireless frequency bands is that the business data of different security partitions carried by the power-dedicated wireless LAN is transmitted through two different wireless frequency bands, which are 2.4 GHz and 5.1 GHz respectively.

5. The method for integrating a passive optical network with a power-specific wireless local area network according to claim 1, characterized in that: The passive optical network and the power-specific wireless local area network are under unified management and control; wherein, The passive optical network includes an optical line terminal and multiple optical network units, and the power-specific wireless local area network includes multiple access points and a wireless network controller; wherein the optical line terminal is connected to multiple optical network unit devices through optical fibers, and the access point of the power-specific wireless local area network establishes a connection with the optical network unit through an Ethernet interface; the optical line terminal remotely manages and controls the optical network unit and the gateway connected to the optical network unit and the access point of the power-specific wireless local area network through an ONU management and control interface channel.

6. The method for integrating a passive optical network with a power-specific wireless local area network according to claim 5, characterized in that: In the power-dedicated wireless LAN, the upper-layer media access control function of the slave device is integrated into the master device, and the slave device retains the queue management and user management functions of the power-dedicated wireless LAN, and the retained functions are managed in a unified manner to achieve unified queue and user management of the backhaul passive optical network and the power-dedicated wireless LAN.

7. A fusion system of a passive optical network and a power-specific wireless local area network, characterized in that: include: Passive optical network, used for deployment on the wired side; In the passive optical network, PON network slicing and combo PON isolation are used to achieve physical isolation of forwarding traffic in different security areas through separate physical wavelengths and ports; A power-specific wireless local area network is used to be deployed on the wireless side; the business data of different security partitions carried by the power-specific wireless local area network is transmitted through different wireless frequency bands; Wherein, each security zone in the power-dedicated wireless local area network can be mapped to one or more security areas in the passive optical network.

8. The fusion system of a passive optical network and a power-specific wireless local area network according to claim 7 is characterized in that: The power-specific wireless LAN is a deterministic wireless LAN, which is constructed using waveform preamble customization, wireless air interface fixed time slot, wired-wireless link layer chip direct strong real-time and data signaling full MAC frame encryption technology, and deploys communication resources across time, frequency and space domains in a diversity and redundancy manner.

9. The fusion system of a passive optical network and a power-specific wireless local area network according to claim 8, characterized in that: In the process of deploying communication resources across time, frequency and space domains using diversity and redundancy, time slot scheduling and periodic data processing mechanisms are used in the time domain, dual-route dual-access point access is used in the space domain, and adaptive frequency hopping transmission is used in the frequency domain.

10. The fusion system of passive optical network and power-specific wireless local area network according to claim 7, characterized in that: The specific manner in which the business data of different security partitions carried by the power-dedicated wireless LAN is transmitted through different wireless frequency bands is that the business data of different security partitions carried by the power-dedicated wireless LAN is transmitted through two different wireless frequency bands, which are 2.4 GHz and 5.1 GHz respectively.

11. The fusion system of a passive optical network and a power-specific wireless local area network according to claim 7, characterized in that: The passive optical network and the power-specific wireless local area network are under unified management and control; wherein, The passive optical network includes an optical line terminal and multiple optical network units, and the power-specific wireless local area network includes multiple access points and a wireless network controller; wherein the optical line terminal is connected to multiple optical network unit devices through optical fibers, and the access point of the power-specific wireless local area network establishes a connection with the optical network unit through an Ethernet interface; the optical line terminal remotely manages and controls the optical network unit and the gateway connected to the optical network unit and the access point of the power-specific wireless local area network through an ONU management and control interface channel.

12. The fusion system of passive optical network and power-specific wireless local area network according to claim 11, characterized in that: In the power-dedicated wireless LAN, the upper-layer media access control function of the slave device is integrated into the master device, and the slave device retains the queue management and user management functions of the power-dedicated wireless LAN, and the retained functions are managed in a unified manner to achieve unified queue and user management of the backhaul passive optical network and the power-dedicated wireless LAN.

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