Research on Construction of Visual Platform of Beijing Power Grid Based on Multi

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Abstract: The platform uses three-dimensional data?modeling, visual simulation and spatial data storage to make the business of regulation center, operation and maintenance center and marketing and management center of Beijing Power grid implement visualized operation, and load the spatial information data, equipment data and operation data of Beijing power grid into the system platform, and the data is displayed with the form of graphic or image, which not only realizes managing space resource data in real three-dimensional scene, but also make the system?operator to know the operation state of the system directly, and makes the control measures more effective. And the paper uses virtual reality technology to establish visual?scene of ground to realize integrated visual display of power transformation, power transmission and power distribution, which not only makes the producers, managers and decision makers directly master the situation of production line in power station, but also realizes that producers and managers affiliate decision makers to formulate production plan.

Key words: Beijing power grid, visual, substation

f scale of distribution network, the electric system of Beijing power grid is increasingly complicated, and the category and amount of data generated in system operation increases greatly, which is difficult to satisfy the requirements of real-time monitor of power grid. Three-dimensional?visualization?technique makes full uses of the third dimension of space. Compared with traditional two-dimensional display mode, it has greater capability of information expression to express large amount data in power station efficiently and directly, which not only is convenient for dispatchers to know the problems of grid system, but also makes dispatchers master operation of power grid. It is widely concerned by scholars in industrial circle, which makes it become one of the important features in new energy management system of power grid.

1 Overall Structure of Platform

1.1Platform architecture

(1) Visual display of power grid

The paper starts from the perspective of information technology and combines three-dimensional display, virtual reality and information integration technology to establish three-dimensional spatial visualization information platform of Beijing power grid. And the paper combines modeling, visual simulation, information integration, visual?interface and multi-state computation for visual display, and innovatively proposes the idea of constructing three-dimensional visual information platform of urban grid space, which not only improves safe operation level of power grid, and improves controllable capability, but also really realizes construction of three-dimensional visual information platform of urban grid space.

(2)Display of topology?relation of power grid

Visual platform of beijing power grid uses distribution network topology modeling?method based on GIS, which not only can clearly display topology relation among substation, transformation box and residential ammeter, but also establishes topology relation between joint current and branch cable. And it uses spatial?analysis function of GIS, which avoids man-machine interaction. And accurate topology model?of distribution network can be generated under the condition that wiring diagram of power grid is drawn irregularly.

(3)Information integration and management function

Visual platform of Beijing power grid can integrate spatial information, engineering drawing, technical manual, device parameters and maintenance information of equipment of Beijing power grid. And it combines real-time information of power grid SCADA to improve integrating and sharing capability of information resources of power grid, which makes the user achieve operation information of power grid.

1.2Integrated management of system

The platform provides open interfaces to integrate business system of departments of Beijing power grid, for unified centralized management and display. And each department can use the platform to call out the business system of the department. For example, the regulation center can use the platform to call out SCADA system and AVC system. The operation and maintenance department can use the platform to call out remote-supervision system. The marketing department?can call out marketing information management system by using the platform. And the information and communication department can use the platform to call out communication management system.

1.3.Real-time display of data

Visual platform of Beijing power grid is required to display data information in real time. And the user provides the interface and data information, which realizes seamless integration with visual platform. Three-dimensional platform is open. Each department of Beijing power grid provides integrated business system interfaces. The platform can realize real-time display of data such as device management system and data monitoring system.

2 Platform Construction

2.1 Basic functions of platform

(1) Digital earth

The platform can display large-scale color landscape around substation including the information of administration division, residential area and population, and the location of sensitive objects. And high-precision remote sensing image data can be used to generate three-dimensional geographical scene?DEM to directly display real physiognomy?of geographical scene. And it can be used to display various terrain parameters such as elevation and slope.

(2)Detailed model

The platform needs to make 1:1 detailed model on substations which are subordinated to power grid. The size of equipment and the allocations of power station should be consistent with actual condition, which meets specified safe distance of electrical work. And it is configured in three-dimensional scene as the basis of the subsequent business functions. The platform highlights primary equipment.

(3)Panoramic display

The platform needs to create large-range three-dimensional color landscape integrating roads, vegetation and power grid. And visible objects including landscape, building and equipment receives digital simulation display according to proportion of 1:1.

2.2 Visualization of platform

(1) Equipment load

The total load, major variable load, power consumption, maximum power supply quantity, SCADA system, principal plane diagram and AVC system are managed and displayed.

(2)Data management

The system can show the basic parameters, operation parameters, maintenance record and historical faults of equipment by selection. (1) Real-time data upload and real-time display. (2) The equipment information uses the way of tablet to display. (3) Important network call wires should be displayed.

(3)Power line patrol

a. Real-time tracking. The inspected lines receive three-dimensional plan, and the critical range of inspected lines is shown. And the place of?inspection personnel is tracked in real time, which achieves complete supervision.

b.Alarm reminding. Missing detection?and border-crossing is alarmed and reminded in the process of polling. Through the function of alarm enquiries, the location is known for timely process.

C.Historical playback. The date and name of personnel can be enquired to enquiry the historical locus curve of an inspector.

d. Power line patrol――defect identifier. For the faults in patrolling, the information should be recorded. And breastplates with different colors are used for different levels of faults.

e. Event handling and query location. Inspection events are classified for management. The places of events are shown in three-dimensional scene, and the processing state is identified, which is easy to analyze and process the event.

(4)Overload alarm

The function of overload module is to compute load of transformer and transmission lines. Integrating real-time monitor system and analyzing equipment data can make flashing alarm on equipment with greater load rate.

(5) Remote-vision system

a.Displaying all monitored location distributions in three-dimensional scene,

b. Querying distribution of cameras near faults and taking remote-vision images at any time.

2.3Visualization of marketing management

(1)Electricity fees management

The platform can integrate the existing electricity fees management system, which not only can make unified management on payment of user, meter reading and data query, but also can optimize the existing electricity fees management system in the range of platform. In addition, the electricity fees management system for marketing department can be developed in platform.

(2)Energy measurement

The platform can integrate the existing energy measurement management system. It integrates the functions including centralized management, payload security control, charge management?and data query. The electric energy metering management system uses a management center for control management. And the electric energy metering management system uses a management center for marketing department can be developed in platform.

(3)Customer service

The platform can integrate the existing electric power client service center management system to combine the clients and enterprises. The clients can use telephone, tax, e-mail and WEB to achieve the required information and service. And the electric power client service center management system for marketing department can be developed in platform.

3 Construction Algorithm of Visual Scene Based on Adaptive Increment

In order to establish topology relation between scattered points?in three-dimensional scenes, the paper proposes construction algorithm of visual scene based on adaptive increment. The set of scattered points is directly triangulated in space. According to the characteristics and Delauney triangulation of surface, the local grid is constructed from the initial center point. And the point on mesh boundary is used as the center point to construct local boundary, which can finally get the topology structure.

3.1 Relevant definitions

Definition 1: (inner projection point) For a triangle in three-dimensional space, if the orthographic projection of the point in space to the triangle is in the triangle, the point is called inner projection point of triangle.

Definition 2: (flatness) Bending degree of curve. For the local