CN104201781A - Small-power wireless private network system applied to smart grid - Google Patents

Abstract

The invention discloses a small electric power wireless private network system applied to a smart grid. The deployment mode of the system can be integrated with optical fiber, carrier wave or GPRS mode. The specific system integration mode is: distribution network automation DSCADA system manages the front end through data collection Use VPN dedicated line to communicate with GPRS network, and GPRS network communicates with power distribution network terminals through wireless gateways; or, distribution network automation DSCADA system communicates with power distribution network terminals through optical network data communication terminals through wireless gateways; or, distribution network The network automation DSCADA system performs data communication with the power distribution network terminal through the optical network data system through each wireless gateway.

Description

Electric small wireless private network system applied to smart grid

Technical field:

The invention relates to a power small wireless private network system applied to a smart grid.

Background technique:

With the deepening of smart grid construction, more and more intelligent devices need to be connected to the integrated dispatching system of the smart grid. The construction of the electricity consumption information collection system of power users is "full coverage, full collection, and full prepayment". Especially with the deepening of the construction of the integrated platform system of the marketing, distribution network, and dispatching system of the smart grid, relatively high-speed, reliability, real-time, and compatibility proposals have been made for the terminals and communication systems in each system of marketing, distribution, and dispatching. high demands.

The smart grid communication system is currently mainly composed of three communication modes: optical fiber communication system, carrier communication system and wireless communication system. The wireless communication mode mainly refers to the wireless communication mode composed of wireless public networks such as GPRS and 3G. The method has been widely used in the centralized copying of the marketing system and some one-remote and two-remote power distribution terminal systems.

In the existing wireless public network communication system, there are various deficiencies such as high billing fees and incomplete wireless signal coverage. Similarly, in the optical fiber communication system, there are problems such as high construction and laying costs, and in some specific areas, it is not the most suitable communication system solution for large-scale laying and networking. In addition, in the distribution network communication system, equipment laying and 10KV medium-voltage system side are often involved, and low-voltage power supply for equipment is a tricky system solution.

In the face of the above-mentioned difficult technical problems in the smart grid, it is more appropriate to use the micro-power wireless system as a communication solution for a specific area in the smart grid system, mainly to solve the following problems in the smart grid system:

Laying cost and difficulty: In the smart grid communication system, the laying of communication lines has always been a difficult construction problem to solve. The low-power wireless system uses short-distance power amplification to achieve regional coverage of the communication system. Using wireless communication, no need to lay communication lines.

The wireless public network cannot fully cover the problem: The wireless public network borrows the wireless public network of the telecom operator. In remote areas, some closed spaces, the coverage of the wireless public network is not complete, resulting in the inability to upload many users and power distribution data in time. A micro-power wireless communication system is used to build a regional wireless private network to ensure timely and effective transmission of wireless data within the region.

The problem of low reliability of wireless communication: due to the use of the wireless public network communication system, due to the shared telecommunications data transmission network, it is relatively easy to be captured or interfered by a large number of irrelevant users, and there is a large security risk. Using micro-power wireless communication, the system integrates security encryption and security redundancy system, which can ensure the security and reliability of data communication from the physical layer and network layer.

The problem of low-voltage power supply in the distribution network system: In the remote 10KV distribution network area, the problem of power supply for communication equipment and terminal equipment has always been a major technical problem that plagues the promotion of the system. Using a low-power wireless communication system, by reducing power consumption and active sleep, the power consumption of the device can be reduced to the mw level, and some sites can maintain long-term device operation with battery power supply mode.

In summary, the regional power communication private network constructed by low-power wireless communication can effectively make up for the difficult system problems in the smart grid communication system, and provide a relatively new communication method for the construction of the smart grid communication system .

Invention content:

In order to overcome the defects of the prior art, the purpose of the present invention is to provide a small electric power wireless private network system applied to the smart grid, which is suitable for small data throughput, less investment in network construction, high network security requirements, and frequent inconvenience It is suitable for the occasion of changing the power supply or charging.

The present invention solves technical problem and adopts following technical scheme:

The power small wireless private network system applied to the smart grid, the system deployment method can be integrated with optical fiber, carrier or GPRS. The specific system integration method is:

The distribution network automation DSCADA system communicates with the GPRS network through the front end of the data collection and management, and the GPRS network communicates with the power distribution network terminal through each wireless gateway; or,

The distribution network automation DSCADA system communicates with the power collection terminal through the optical network data communication terminal through each wireless concentrator and wireless gateway; or,

The distribution network automation DSCADA system performs data communication with the power distribution network terminal through the optical network data system through the main carrier communication machine, the secondary carrier communication machine, each wireless gateway and the power distribution network terminal.

In the communication management platform of low-voltage centralized copying, the micro-power wireless communication system combines with the existing optical fiber communication system to jointly form the underlying network platform of the intelligent low-voltage centralized copying system. The specific network topology:

The power grid marketing management system communicates with the power collection terminal through the optical network data communication terminal through each wireless concentrator and wireless gateway; or,

The power grid marketing management system communicates with the GPRS network through the front end of the data collection and management, and the GPRS network communicates with the power collection terminal through each wireless gateway.

Compared with the prior art, the beneficial effects of the present invention are reflected in:

The overall requirement of the State Grid Corporation of China for the construction of a strong smart grid is to ensure that the construction of the smart grid is promoted in an orderly manner, and to achieve "full coverage, full collection, and full prepayment" in the construction of a power user information collection system. Low-voltage residential meter reading has the widest coverage and the largest number of users, and is the focus of goal realization.

There are two types of low-voltage meter reading systems according to the meter reading communication methods: wired and wireless. The wired meter reading method mainly uses the RS-485 bus and the low-voltage carrier meter reading system; the wireless meter reading application mainly uses the GPRS wireless public network communication module. Moreover, in the current low-voltage meter reading system, the communication mode combining the collector and the concentrator is often adopted, which is a communication model in which two communication modes are mixed: the collector and the concentrator adopt a low-voltage carrier communication mode, and the concentrator and the concentrator The GPRS communication method is adopted between the centralized copying servers.

However, there are still many shortcomings in the current low-voltage centralized reading system: the environment of the low-voltage distribution network is complex, the interference is large, and the low-voltage power line carrier is difficult to ensure the stability of its meter reading; for the power environment of multiple transformers, due to carrier crosstalk, it is not suitable to implement carrier Meter reading solution; due to the limited transmission distance of the carrier, it is necessary to ensure the coverage of meter reading through relays, which cannot achieve full coverage for low-density residential areas such as rural areas and urban-rural fringes, and it is very difficult to implement; the low-voltage power line narrow-band carrier rate is low, real-time The performance is poor, and it cannot meet the needs of remote prepayment and remote opening and closing.

Micro-power wireless communication technology can overcome the shortcomings of other communication methods in some meter reading applications. Rapid implementation of meter reading solutions in cross-platform areas and complex power consumption environments: fast communication speed, high real-time performance, and convenient implementation of remote prepayment, remote switching and other applications.

In the communication management platform of low-voltage centralized copying, the micro-power wireless communication system will combine the existing optical fiber communication system and wireless public network GPRS communication system to jointly form the underlying network platform of the intelligent low-voltage centralized copying system.

The degree of intelligence of the power grid is getting higher and higher, and the requirements for the smart substation system are getting higher and higher. Smart substation adopts advanced, reliable, integrated and environment-friendly intelligent equipment, with the basic requirements of digitalization of whole station information, networking of communication platform, and standardization of information sharing, and automatically completes basic functions such as information collection, measurement, control, protection, measurement and detection. At the same time, it is a substation with advanced functions such as real-time automatic control of the power grid, intelligent adjustment, online analysis and decision-making, and collaborative interaction.

The micro-power wireless network is used to cover the equipment management area of each smart substation, and the equipment wireless local area network in the smart substation is constructed to realize the interconnection and intercommunication of security and detection equipment inside the smart substation, which can realize the maximum sharing of information inside the substation.

It is necessary to build a strong smart grid construction work, and an important construction work content is to realize distribution network automation. In 10KV and 35KV medium-voltage power grids, automatic detection, fault analysis, effective isolation, and rapid recovery of the operating status of the power grid are realized to ensure the reliability and safety of power consumption for users. However, with the spread of distribution network automation system construction, the communication system of distribution network automation is faced with complex site conditions, diverse equipment levels, and high reliability requirements. Accordingly, the communication system construction scheme of distribution network automation is also more diverse. , There are optical fiber communication systems, wireless communication methods and medium voltage carrier communication methods.

In the current construction plan of the distribution network automation communication system, the reliability and safety of the optical fiber communication method are high, and it is suitable for the construction plan of the distribution network communication system in the urban core area and new district, but the construction is more complicated and the use cost is relatively high. It is not suitable for the construction of large-scale suburban distribution network, old city distribution network and rural distribution network communication system. The carrier communication method is a relatively mature communication method, and the construction is relatively convenient. However, since the primary network frame is used as the communication transmission medium, it is easily disturbed by the power cable environment, and there are certain limitations. At present, the GPRS or 3G wireless public network communication technology widely used in the distribution network automation system is also widely used in the distribution network automation system. However, due to the interference of public network signals, and the safety and reliability cannot meet the requirements of the distribution network system, only It can be applied to the communication site of one remote and two remote to realize the monitoring of the status of field equipment.

The micro-power wireless communication system is used as the communication method of distribution network automation, and the on-site construction of the distribution network automation area covers the private network based on the micro-power wireless area. Network communication and medium voltage carrier communication are effectively supplemented. The micro-power wireless communication system in this system adopts two data conversion models of network data exchange and application data capture to meet the compatibility and interconnection with various communication methods such as optical fiber, wireless, and carrier; and the micro-power in this system Wireless has designed a mutual backup system based on network routing and a mutual backup method based on uplink interfaces, which can resist single-point or multi-point failures of micro-power wireless networks, and ensure the reliability and security of the system to the greatest extent. In addition, in the medium-voltage distribution network system, the low-voltage power-taking method has not troubled the development of the distribution network automation system. The use of a micro-power wireless communication system, combined with the low power consumption and trigger wake-up mode of the micro-power wireless system, can be powered by dry batteries. The power consumption of the system can be maintained for a long period of time.

Description of drawings:

Fig. 1 is a schematic diagram of the system framework of the present invention; Fig. 2 is a schematic diagram of a micro-power wireless regional private network architecture in a region merged with a GPRS system; Fig. 3 is a schematic diagram of a micro-power wireless regional private network architecture in a region merged with an optical fiber system; Fig. 4 is A schematic diagram of the communication mode integrated with the carrier communication system; Figure 5 is a schematic diagram of a low-voltage centralized copy communication network composed of a micro-power wireless + optical fiber communication system; Figure 6 is a schematic diagram of a low-voltage centralized copy communication network composed of a micro-power wireless + GPRS communication system.

The present invention will be further described below through specific embodiments and in conjunction with the accompanying drawings.

Detailed ways:

Embodiment: The electric power small wireless private network system applied to the smart grid described in the present invention can be deployed in a manner integrated with optical fiber, carrier wave or GPRS. The specific system integration method is as follows:

(Integrated with the GPRS system to build a regional micro-power wireless regional private network): the distribution network automation DSCADA system uses a VPN dedicated line to communicate with the GPRS network through the data collection and management front end, and the GPRS network communicates with the power distribution network terminal through each wireless gateway; or,

(Micro-power wireless regional private network integrated with optical fiber system): distribution network automation DSCADA system communicates with power collection terminals through optical network data communication terminals through wireless concentrators and wireless gateways; or,

(Communication mode integrated with the carrier communication system): The distribution network automation DSCADA system performs data communication with the power distribution network terminal through the optical network data system through the main carrier communication machine, the secondary carrier communication machine, each wireless gateway and the power distribution network terminal.

In the communication management platform of low-voltage centralized copying, the micro-power wireless communication system combines with the existing optical fiber communication system to jointly form the underlying network platform of the intelligent low-voltage centralized copying system. The specific network topology:

The power grid marketing management system communicates with the power collection terminal through the optical network data communication terminal through each wireless concentrator and wireless gateway; or,

The power grid marketing management system communicates with the GPRS network through the front end of the data collection and management, and the GPRS network communicates with the power collection terminal through each wireless gateway.

The present invention mainly describes a regional electric power communication private network constructed by a low-power wireless communication mode. The micro-power wireless communication system is a low-speed, low-cost, and low-power wireless data transmission network formed by wireless communication modules. Committed to providing a low-cost wireless communication technology with low complexity, cost and power for fixed, portable or mobile devices. This technology is suitable for applications where the data throughput is small, the investment in network construction is small, the network security requirements are high, and it is inconvenient to replace the power supply or charge frequently. For example: home automation, industrial automation, power automation, environmental monitoring systems and other equipment.

With the development of network technology, the micro-power wireless communication system has developed from point-to-point communication mode to complex network systems such as star network formation, mesh network formation, and multi-path transmission.

The construction of a micro-power wireless regional coverage power private network communication system is to use a suitable micro-power wireless communication platform as the communication physical layer, and based on this communication platform, build a communication model suitable for the power wireless private network to meet certain requirements. The area coverage communication technology in the area, in this system, the function expansion of the equipment system is carried out according to the partial level modules of the OSI seven-layer protocol of the standard network equipment. The specific system frame structure is shown in Fig. 1 .

The micro-power wireless communication system is used as the communication method of distribution network automation, and the on-site construction of the distribution network automation area covers the private network based on the micro-power wireless area. Network communication and medium voltage carrier communication are effectively supplemented. The micro-power wireless communication system in this system adopts two data conversion models of network data exchange and application data capture to meet the compatibility and interconnection with various communication methods such as optical fiber, wireless, and carrier; and the micro-power in this system Wireless has designed a mutual backup system based on network routing and a mutual backup method based on uplink interfaces, which can resist single-point or multi-point failures of micro-power wireless networks, and ensure the reliability and security of the system to the greatest extent. In addition, in the medium-voltage distribution network system, the low-voltage power-taking method has not troubled the development of the distribution network automation system. The use of a micro-power wireless communication system, combined with the low power consumption and trigger wake-up mode of the micro-power wireless system, can be powered by dry batteries. The power consumption of the system can be maintained for a long period of time.

Claims (2)

1. The power small wireless private network system applied to the smart grid is characterized in that the deployment method of the system can be integrated with optical fiber, carrier or GPRS. The specific system integration method is: The distribution network automation DSCADA system communicates with the GPRS network through the front end of the data collection and management, and the GPRS network communicates with the power distribution network terminal through each wireless gateway; or, The distribution network automation DSCADA system communicates with the power collection terminal through the optical network data communication terminal through each wireless concentrator and wireless gateway; or, The distribution network automation DSCADA system performs data communication with the power distribution network terminal through the optical network data system through the main carrier communication machine, the secondary carrier communication machine, each wireless gateway and the power distribution network terminal. 2. The electric power small wireless private network system applied to the smart grid according to claim 1, characterized in that, in the communication management platform of low-voltage centralized copying, the micro-power wireless communication system is jointly established in combination with the existing optical fiber communication system The underlying network platform of the intelligent low-voltage centralized copying system, the specific network topology: The power grid marketing management system communicates with the power collection terminal through the optical network data communication terminal through each wireless concentrator and wireless gateway; or, The power grid marketing management system communicates with the GPRS network through the front end of the data collection and management, and the GPRS network communicates with the power collection terminal through each wireless gateway.