CN103825944B - A kind of substation safety management system based on Internet of Things - Google Patents

Abstract

The invention discloses a kind of substation safety management system based on Internet of Things, including server, interchanger, internal switch, front end processor, WSN nodes and mobile terminal, the server passes through internal lan connection communication with the interchanger, the interchanger passes through power-line carrier network connection communication with the internal switch, the internal switch is with the front end processor by middle pressure broadband power line carrier trolley line and fiber mix connection communication, the WSN nodes and the communication of mobile terminal that the front end processor passes through Zigbee wireless sensor self-organizing network.The present invention realizes substation safety job management, monitoring of equipment and environment sensing, and mesolow communication access net mixed networking efficiently solves the problems, such as the communication performance bottleneck of distribution last one kilometer.

Description

A Substation Safety Management System Based on Internet of Things

technical field

The invention relates to a substation safety management system, in particular to a substation safety management system based on the Internet of Things.

Background technique

Substation is a high-risk work area. If the management is not in place, accidents may occur if you don't pay attention. Under the current people-oriented call, all work in the substation puts personal safety first. However, in addition to the restrictions of rules and regulations such as operating procedures and safety treaties, there is no practical and feasible means of safety protection for active alarms. Therefore, if the operator makes mistakes, misjudgments, or laziness, arbitrariness, patrols stray into the interval, etc., it may directly or indirectly lead to the occurrence of accidents, threatening personal safety and loss of economic benefits.

Smart substation is an important foundation and support for a strong smart grid. It has the characteristics of informatization, automation and interaction, and is composed of advanced, reliable, energy-saving, environmental protection and integrated equipment. It uses a high-speed network communication platform as the basis for information transmission, automatically completes basic functions such as information collection, measurement, control, protection, metering and detection, and can support real-time automatic control of power grids, intelligent adjustment, online analysis and decision-making, collaborative interaction and other advanced functions as needed. App function.

At present, most substations in China do not have monitoring and alarm systems for staff. Although some substations are equipped with cameras, which play a certain role in supervision, the cameras have some "dead spots" in monitoring; the transmission of video information exists. Time delay, real-time monitoring cannot be realized; each camera only monitors the staff within the specified area, and cannot form a continuous monitoring mode; at the same time, its wiring and installation procedures are complicated and costly, and are only suitable for small substations. Some substation personnel operation management systems have the problems of substation inspection, maintenance, visitor boundary warning and inaccurate positioning. For equipment detection and environment perception, they are independent small automation devices that do not have intelligent dialogue functions, forming multiple information islands, requiring more manual attention, understanding and processing of the information of these devices, which has not reached the intelligent operation and management of smart substations. Require.

The Internet of Things technology realizes the integration of human society and physical systems, and realizes real-time management and control of equipment through automatic and real-time identification, positioning, tracking, monitoring and triggering of corresponding events. Using the Internet of Things technology, through the perception of the outside world, build a substation safety operation management system to meet the requirements of "intelligent detection, intelligent judgment, intelligent management, and intelligent verification", and realize the intelligent safety operation management of substations.

Contents of the invention

In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a substation safety management system based on the Internet of Things, to build a distribution network end heterogeneous network integrating Zigbee self-organizing network, power line carrier, and optical fiber communication. The communication platform realizes substation safety operation management, equipment monitoring and environmental perception.

In order to achieve the above object, the present invention provides a substation safety management system based on the Internet of Things, including a server, a switch, an internal switch, a front-end processor, a WSN node and a mobile terminal, and the server and the switch are connected and communicated through an internal local area network , the switch communicates with the internal switch through a medium-voltage broadband power line carrier overhead line and optical fiber hybrid transmission network, the internal switch communicates with the front-end device through a power carrier network, and the front-end device communicates through a Zigbee wireless The WSN node of the sensor ad hoc network communicates with the mobile terminal.

In a preferred embodiment of the present invention, the substation safety management system based on the Internet of Things further includes a monitoring client, the monitoring client is connected to the communication center with the server, and the monitoring client is the monitoring center.

In another preferred embodiment of the present invention, the hybrid transmission network of overhead line and optical fiber with wide band carrier is an application of 10kV overhead line and cable hybrid network, and its measured peak bandwidth is 90M and 83M respectively.

In a preferred embodiment of the present invention, the switch is a Cisco 3750.

In another preferred embodiment of the present invention, the internal switch is an internal switch in the low-voltage power distribution room of Fumin Substation.

In a preferred embodiment of the present invention, the substation safety operation system also includes a safety operation early warning and positioning system, and the safety operation early warning and positioning system includes anchor nodes 8, WSN nodes 5, mobile terminals 6, monitoring The front-end processor 4 and the gateway node 9, the monitoring front-end processor 4 of the safe operation early warning and positioning system communicates with the power line carrier access terminal 10 of the low-voltage power distribution room through TCP/IP, and the power line carrier connection of the low-voltage power distribution room The incoming terminal is connected to communicate with the monitoring center 7 on the internal LAN, the anchor node 8 is similar to the base station of a mobile phone, and is deployed in the target area and nearby monitoring areas of interest, and the WSN node 5 can automatically form a network, Form a self-organizing network system and receive signals within its coverage.

A method for early warning and positioning of practitioners' safety operations in the substation safety management system based on the Internet of Things, the specific steps are as follows:

Step 1: Deploy the terminal installed with the positioning method program in the monitoring area of the target area and its nearby dangerous points along the inspection route;

Step 2: The mobile terminal 6 worn on the person broadcasts "heartbeat information" including its own ID to the outside at regular intervals;

Step 3: After the anchor node 8 receives the heartbeat information, it passes through the self-organizing network formed by the WSN node 5;

Step 4: The self-organizing network automatically uploads data to the gateway node 9 and is read in by the monitoring front-end processor 4;

Step 5: The front-end processor 4 calculates the current location of the staff or external visitors from the location of the anchor node 8 that receives the heartbeat signal through the positioning method, and combines the different geographical locations of the interval (or working area) distribution in the substation, Determine whether the area where the staff who holds the mobile terminal 6 is an illegal area, and automatically upload to the control monitoring client;

Step 6: If it is an illegal area, the control and monitoring client will automatically call the police, reminding patrol personnel to pay attention to safety or other regulations, reminding outsiders to return to legal areas, and can also notify relevant departments for emergency treatment.

In a preferred embodiment of the present invention, the positioning method in the step 5 is a neural network-based adaptive positioning algorithm, and the specific steps are as follows:

(1) According to the actual environment of the site, combined with the neural network to construct the RSSI-distance prediction model;

(2) The mobile terminal 6 regularly broadcasts and sends heartbeat information;

(3) The anchor node 8 that receives the heartbeat information is automatically sorted according to the RSSI value, and performs filtering and normalization processing to obtain Rssin[n];

(4) Select up to 4 anchor nodes from Rssin[n] in a certain way as the input of the neural network RSSI-distance prediction model obtained in step 1, and the output of this model is the distance Dis[ n];

(5) Calculate the current position coordinates of the target according to the obtained Dis[n] value according to the centroid positioning algorithm; at the same time, input the obtained Dis[n] value as a new sample into the neural network model in step 1 to optimize the model;

(6) Use the motion direction angle prediction model to perform adaptive clipping on the position coordinates calculated by the centroid positioning algorithm, so as to obtain a smooth motion trajectory.

A method for implementing a medium-voltage broadband power line carrier in a substation safety management system based on the Internet of Things, the specific steps are as follows:

Step 1: Determine the main node of BPLC communication, select substations and switching stations with power optical fiber as the main node of the medium-voltage broadband carrier communication network, install medium-voltage BPLC head-end equipment, seamlessly connect with the power optical fiber network, and use 10kV power distribution Set up medium-voltage broadband carrier communication sub-nodes in the power grid;

Step 2: Starting from the PLC master node, design branch communication lines according to the 10kV distribution network, that is, use transformers, ring network cabinets or branch boxes on medium-voltage lines as relay/terminal nodes, and install medium-voltage power line broadband carrier relays / Terminal equipment is connected with distribution network automation equipment to realize data upload and forwarding;

Step 3: Deploy sub-nodes at the knife gate or switch and use both ends of the coupling. In order to ensure that the medium-voltage broadband carrier signal transmission is not affected by the knife gate or switch, BPLC equipment can be installed at the knife gate or switch and the lines at both ends An inductive coupler is installed on it to play the function of bridging BPLC signals;

Step 4: Data upload and instruction issuance, data information related to distribution network automation along the medium-voltage line, upload to the monitoring client through the power line broadband branch network, optical fiber backbone, and network, and the monitoring client implements instruction issuance, two-way Interaction, realizing remote signaling, telemetry, remote adjustment, remote control and remote viewing.

Based on the Internet of Things technology and collaborative information processing technology, the present invention successfully builds a distribution network terminal heterogeneous network communication platform that integrates Zigbee self-organizing network, power line carrier, and optical fiber communication, and realizes substation safety operation management, equipment monitoring, and environmental perception. The mixed networking of the medium and low voltage communication access network effectively solves the communication bottleneck problem of the last mile of the distribution network.

The idea, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of the present invention.

Description of drawings

Fig. 1 is a structural diagram of a substation safety management system of a preferred embodiment of the present invention;

Fig. 2 is a structure diagram of a safety operation early warning and positioning system of a preferred embodiment of the present invention;

Fig. 3 is a flowchart of an adaptive positioning algorithm based on a neural network in a preferred embodiment of the present invention.

detailed description

As shown in Figure 1, a substation safety management system based on the Internet of Things includes a server 1, a switch 2, an internal switch 3, a front-end processor 4, a WSN node 5, and a mobile terminal 6, and the server 1 and the switch 2 are connected through an internal LAN Communication, the switch 2 and the internal switch 3 are connected and communicated through the power carrier network, and the communication is connected through a medium-voltage broadband power line carrier overhead line and optical fiber. The WSN node 5 of the sensor ad hoc network communicates with the mobile terminal 6 . The management system is a distribution network terminal heterogeneous network communication platform integrating zigbee self-organizing network, power line carrier, and optical fiber communication. It realizes substation safety operation management, equipment monitoring and environmental awareness.

Switch 2 is a Cisco 3750, and internal switch 3 is an internal switch in the low-voltage power distribution room of Fumin Substation.

In the substation safety operation system, it also includes a safety operation warning and positioning system to solve the problems of substation inspection, maintenance, visitor border warning and positioning. The system architecture is shown in Figure 2, including anchor nodes 8 and WSN nodes installed on site 5. Mobile terminal 6, monitoring front-end processor 4 and gateway node 9, the monitoring front-end processor 4 of the positioning system communicates with the power line carrier access terminal 10 of the low-voltage power distribution room through TCP/IP, and the power line carrier of the low-voltage power distribution room is connected internally Communicate with the monitoring center 7 on the local area network. The anchor node 8 is similar to the base station of a mobile phone. It is deployed in the target area and nearby monitoring areas of interest. The WSN node 5 can automatically form a network to form a self-organizing network system and receive signals within its coverage. The mobile terminal 6 worn on the body can regularly broadcast the "heartbeat information" containing its own ID. When the anchor node 8 around the mobile terminal 6 receives the heartbeat information, it will automatically transfer the data through the self-organizing network formed by the WSN node 5. Uploaded to the gateway node 9 and read in by the monitoring front-end processor 4. The front-end processor 4 can calculate the current location of the staff or external visitors through the positioning method or tracking the location of the anchor node 8 that receives the heartbeat signal, and determine the location of the owner by combining the different geographical locations of the interval (or working area) distribution in the substation. Whether the area where the staff of the mobile terminal 6 is located is an illegal area, if so, the system will automatically alarm, remind the patrol personnel to pay attention to safety or other regulations, remind outsiders to return to the legal area, and also notify relevant departments to carry out emergency treatment . The system effectively improves the target positioning accuracy, greatly improves the smoothness of trajectory tracking, and improves the safety of substation employees.

The positioning method used by the front-end processor 4 is an adaptive positioning method based on a neural network. The process is shown in Figure 3, and the specific steps are:

(1) According to the actual environment of the site, combined with the neural network to construct the RSSI-distance prediction model;

(2) The mobile terminal 6 regularly broadcasts and sends heartbeat information;

(3) The anchor node 8 that receives the heartbeat information is automatically sorted according to the RSSI value, and performs filtering and normalization processing to obtain Rssin[n];

(4) Select up to 4 anchor nodes from Rssin[n] in a certain way as the input of the neural network RSSI-distance prediction model obtained in step 1, and the output of this model is the distance Dis[ n];

(5) Calculate the current position coordinates of the target according to the obtained Dis[n] value according to the centroid positioning algorithm; at the same time, input the obtained Dis[n] value as a new sample into the neural network model in step 1 to optimize the model;

(6) Use the motion direction angle prediction model to perform adaptive clipping on the position coordinates calculated by the centroid positioning algorithm, so as to obtain a smooth motion trajectory.

The present embodiment adopts the wireless sensor self-organizing network that Zigbee node forms to carry out data sending and receiving at the data acquisition end, and this part data transmission is finished between front-end processor 4 and WSN node 5; Between front-end processor 4 and data transmission server 1 The power line medium-voltage broadband carrier and Ethernet communication methods are used for transmission, which effectively solves the communication bottleneck problem of the last mile of the distribution network.

The medium-voltage broadband power line carrier technology adopts OFDM-based overhead line and cable hybrid transmission network mode, which is the application of 10kV overhead line and cable hybrid network mode. Its measured peak bandwidth uplink and downlink can reach 90M and 83M, which is equipped with five remote functions Realize the provision of technical support and solve the real-time information interaction and network transmission of substations. The specific implementation plan is as follows:

(1) Determine the main node of BPLC communication, select substations and switching stations with power optical fiber as the main node of the medium-voltage broadband carrier communication network, install medium-voltage BPLC head-end equipment, seamlessly connect with the power optical network, and use 10kV power distribution Set up medium-voltage broadband carrier communication sub-nodes in the power grid;

(2) Starting from the PLC main node, design branch communication lines according to the 10kV distribution network, that is, use transformers, ring network cabinets or branch boxes on medium-voltage lines as relay/terminal nodes, and install medium-voltage power line broadband carrier relays / Terminal equipment is connected with distribution network automation equipment to realize data upload and forwarding;

(3) Deploy sub-nodes at the knife gate or switch and adopt coupling at both ends. In order to ensure that the medium-voltage broadband carrier signal transmission is not affected by the knife gate or switch, BPLC equipment can be installed at the knife gate or switch and the lines at both ends An inductive coupler is installed on it to play the function of bridging BPLC signals;

(4) Data upload and instruction issuance, data information related to distribution network automation along the medium-voltage line, uploaded to the monitoring client through the power line broadband branch network, optical fiber backbone, and network, and the monitoring client implements instruction issuance, two-way interaction, and remote monitoring. Communication, telemetry, remote adjustment, remote control and remote viewing.

The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art shall be within the scope of protection defined by the claims.

Claims (4)

1. A method for implementing a medium-voltage broadband power line carrier in a substation safety management system based on the Internet of Things, wherein the substation safety management system based on the Internet of Things includes a server, a switch, an internal switch, a front-end computer, a WSN node, and a mobile terminal, the server and the switch are connected and communicated through an internal LAN, the switch and the internal switch are connected and communicated through a medium-voltage broadband power line carrier overhead line and an optical fiber hybrid transmission network, and the internal switch communicates with the front-end processor through Power carrier network connection communication, the front-end processor communicates with the mobile terminal through the WSN node of the Zigbee wireless sensor ad hoc network; also includes a monitoring client, the monitoring client is connected to the communication center with the server, so The monitoring client is a monitoring center; a safe operation early warning and positioning system, the safe operation early warning and positioning system includes an anchor node, a WSN node, a mobile terminal, a monitoring front-end processor and a gateway node installed on the site, and the safe operation early warning and positioning system The monitoring front-end processor communicates with the power line carrier access terminal in the low-voltage power distribution room through TCP/IP, and the power line carrier access terminal in the low-voltage power distribution room is connected to the internal LAN to communicate with the monitoring center. The anchor The node is similar to the base station of a mobile phone, and is deployed in the target area and nearby monitoring areas of interest. The WSN node can automatically form a network to form a self-organizing network system and receive signals within its coverage; including the following steps: Step 1: Determine the main node of broadband power line communication, select the substation and switching station with power optical fiber as the main node of the medium-voltage broadband carrier communication network, install the head-end equipment of medium-voltage broadband power line communication, seamlessly connect with the power optical fiber network, use The 10kV distribution network is equipped with medium-voltage broadband carrier communication sub-nodes; Step 2: Starting from the main node of power line communication, design branch communication lines according to the 10kV distribution network, that is, use the transformer, ring main unit or branch box on the medium voltage line as the relay/terminal node, and install the medium voltage power line broadband carrier relay / Terminal equipment is connected with distribution network automation equipment to realize data upload and forwarding; Step 3: Deploy sub-nodes at the knife gate or switch and use two-terminal coupling. In order to ensure that the medium-voltage broadband carrier signal transmission is not affected by the knife gate or switch, broadband power line communication equipment can be installed at the knife gate or switch. An inductive coupler is installed on the end line to serve as a bridge for broadband power line communication signals; Step 4: Data upload and instruction issuance, data information related to distribution network automation along the medium-voltage line, upload to the monitoring client through the power line broadband branch network, optical fiber backbone, and network, and the monitoring client implements instruction issuance, two-way Interaction, realizing remote signaling, telemetry, remote adjustment, remote control and remote viewing. 2. The medium-voltage broadband power line carrier implementation method of the substation safety management system based on the Internet of Things according to claim 1, wherein the medium-voltage broadband carrier overhead wire and optical fiber hybrid transmission network is a hybrid of 10kV overhead wire and cable For the application of networking mode, the measured peak bandwidth up and down behavior is 90M and 83M. 3. The method for implementing the medium-voltage broadband power line carrier in the substation safety management system based on the Internet of Things according to claim 1, wherein the switch is a Cisco 3750. 4. The method for implementing the medium-voltage broadband power line carrier in the substation safety management system based on the Internet of Things according to claim 1, wherein the internal switch is an internal switch in the low-voltage power distribution room of Fumin Substation.