Design and Implementation of SCADA System Based Power
Contents
1. I INTRODUCTION Power distribution SCADA system is a computer based production process control and scheduling automation system It uses the data acquisition module to monitor and control the operation of field devices so as to achieve data acquisition device control measurement parameter adjustment and various signal alarms The power distribution SCADA system has many advantages such as information integrity efficiency correct grasp of system running status speeding up decision making and can help ISSN 2278 7798 quickly diagnose the failure state of the system It has become an indispensable tool for power dispatching The SCADA system can monitor and control equipments operated on the site so as to achieve functions such as data acquisition measurement parameter adjustment and various signal alarms The power distribution monitoring system uses two monitoring hosts one main host and one standby host to call and monitor the load status load distribution curve important alarm accident Statistics working status and other electricity monitoring data of various substations SCADA is an acronym for Supervisory Control and Data Acquisition SCADA systems are used to monitor and control a plant or equipment in industries These systems encompass the transfer of data between a SCADA central host computer and a number of Remote Terminal Units RTUs A SCADA system gathers information such as where the fault2. 298 Shoarinejad Arash Communication Protocols in Substation Automation and SCADA 15p Maintenance Management using M SCADA First Iranian Maintenance Conference NET 1994 14 Energy Distribution Management in distribution networks using MSCADA National Conference of Electrical Distribution Companies 1993 All Rights Reserved 2014 IJSETR 1546
3. International Journal of Science Engineering and Technology Research IJSETR Volume 3 Issue 5 May 2014 Design and Implementation of SCADA System Based Power Distribution for Primary Substation Monitoring System Aye Min Zaw Hla Myo Tun Department of Electronic Engineering Mandalay Technological University Mandalay Myanmar Abstract networking in SCADA based electrical distribution technology This research describes monitoring system and for primary substation The objective of the study is to transform the manual control system to automated switch control system in Myanmar There are four main portions in SCADA based electrical distribution system They are automated control system interfacing units monitoring system and network architecture The monitoring system and networking are emphasized in this research The monitoring system can be accomplished with the use of GUI This system monitors status of field devices and data transfer between RTU and MTU so that the system can be easily controlled by the operator via server and clients The simulations based approach automated system are demonstrated According to the simulation results the user can easily control based on this GUI software environment This system is efficient and reliable for conventional electrical distribution system in Myanmar by using SCADA based technology Keywords SCADA monitoring system electrical distribution of primary substation
4. NG SYSTEM OF A PRIMARY SUBSTATION The monitoring system is a real time supervision system of the field devices real time status currents voltages pressures temperatures contacts etc This supervision is made through digital equipments and special sensors that are installed in the field devices of the substation The data are collected and processed in a data acquisition and control unit UAC to thereafter through a communication network using desirably a protocol standardized internationally be sent to a central computer located at the control building of the substation and later to the operation centers and so allowing a remote supervision A Implementation of monitoring system of a primary substation The monitoring system of a primary substation is as shown in fig3 composed of main window and three sub windows where the operator can easily work out Metering System Alarms System Load kWh Current Transformer Potential Transformer Transformer Winding Operating System Incoming and 2 Outgoing Transformer Bay Transformer 2 Bay 33 kV Bus Bay Feeder Bay Temp Oil Temp Oil Level Figure 3 Flow diagram of monitoring system The monitoring display of a substation is shown in fig 4 Supervisory condition can be seen and changed by three statuses such as no communication closed opened All button and text name on control screen have already connected with the field devices or IEDs of and dist
5. ace devices RTUs or PLCs A communication system such as radio telephone cable satellite etc A central host computer sever or severs also called a SCADA center or Master Terminal Unit MTU A collection of standard and or custom software Human Machine Interface HMI Critical infrastructure systems include critical physical processes These processes are controlled by automation systems which combine humans computers communications and procedures Automation systems are used to increase the efficiency of process control by trading off high personnel costs for low computer system costs They also contribute to improve performance by taking advantage of faster computer control instead of human reaction times These automation system are often referred to as process control system PCS or supervisory control and data acquisition SCADA systems and the widespread use of such systems makes them critical to the safe reliable and efficient operation of many physical processes Specific terminology is associated with the components of SCADA systems These SCADA elements are define as follows ISSN 2278 7798 Operator Human operator who monitors the SCADA system and performs supervisory control functions for the remote plant operations Human machine interface HMI Presents data to the operator and provides for control inputs in a variety of formats including graphics schematics windows pull down menus touch screen
6. arehouse or be sent to an appropriate location for storage of the substation data The system must know the status of all connected IEDs at all times Basic information describing the operation state of the power network is passed to the SCADA system This information is collected automatically by the equipment in various substation and devices and can be categorized as status indication measured values and energy values The status of switching devices and alarm signals are represented by status indications and these indications are already closings connected to digital input boards of the RTUs Measured values reflect different time varying quantities such as voltage current temperature and tap changer positions which are collected from the power system They fall into two basic types analog and digital All analog signals are transformed via an A D converter to binary format because treated as momentary value that they have to be normalized before storing in the SCADA database The SCADA system is configured around the following standard functions such as data acquisition monitoring and event supervising control data storage archiving and analysis and then reporting However this paper illustrates monitoring and event supervising of substation distribution system All Rights Reserved 2014 IJSETR 1544 International Journal of Science Engineering and Technology Research IJSETR Volume 3 Issue 5 May 2014 IHI MONITORI
7. in transmission line has occurred transfers the information back to a central site then alerts the home station that a fault has occurred carrying out necessary analysis and control such as determining if the fault is critical and displaying the information in a logical and organized fashion SCADA systems have made use of the infrastructure of the corporate Local Area Network LAN Wide Area Network WAN purposes Wireless technologies for monitoring 1542 All Rights Reserved 2014 IJSETR International Journal of Science Engineering and Technology Research IJSETR Volume 3 Issue 5 May 2014 Il INTERFACING BETWEEN SCADA AND SUBSTATION CONTROL SYSTEM A Introduction of SCADA system SCADA supervisory control and data acquisition system refers to the combination of telemetry and data acquisition SCADA encompasses the collecting of the information via a RTU remote terminal unit transferring it back to the central site carrying out any necessary analysis and control and then displaying that information on a number of operator screens or displays The required control actions are then conveyed back to the process SCADA is a common process automation system It is also called Energy Management System EMS A SCADA system gathers data from sensors and instruments located to remote sides Then it transmits data at a central site for controller monitoring process SCADA system consists of one or more field data interf
8. ribution system Therefore the collecting data from field devices send to their respective button and text archives and then each button changing condition can vary the storage value of the supervision screen If an operator wants to close or open some line operator can directly open or close the button or text on the screen as a real time condition Each tag properties on screen can be changed and seen by clicking on desired button ISSN 2278 7798 a Powe Distribution System eee Figure 5 Showing the status of main transformer 1 IV CONCLUSION The main purpose of power system management EMS or SCADA system is to generate transmit and distribute electric energy efficiently SCADA main function is to supervise control and manage power networks in an integrated manner The whole distribution can be seen on displayed screen and periodic data changes can be acquired automatically The main advantage of this system is labors can be trained on computer and their skills can be improved in short time Future plan can be All Rights Reserved 2014 IJSETR 1545 International Journal of Science Engineering and Technology Research IJSETR Volume 3 Issue 5 May 2014 simulated with the help of SCADA software Then following parameter can be calculated easily Load flow calculation Short circuit calculation Stability calculation Transient analysis Load forecasting Protective relay coordination At
9. s and so on Master terminal unit MTU Equivalent to a master unit in a master slave architecture The MTU presents data to the operator through the HMI gathers data from the distant site and transmits control signals to the remote site The transmission rate of data between the MTU and the remote site is relatively low and the control method is usually open loop because of possible time delays or data flow interruptions Communications means Communication method between the MTU and remote controllers Communication can be through the Internet wireless or wired networks or the switched public telephone network Remote terminal unit RTU Functions as a Slave in the master slave architecture Sends control signals to the device un der control acquires data from these devices and transmits the data to the MTU An RTU may be a PLC The data rate between the RTU and controlled device is relatively high and the control method is usually closed loop All Rights Reserved 2014 IJSETR 1543 International Journal of Science Engineering and Technology Research IJSETR Volume 3 Issue 5 May 2014 Interfacing Devices Figure 1 Block diagram of SCADA system B Primary substation It can be performed as a transmission substation and also as a distribution substation As a distribution substation the sub transmission voltage is reduced for general distribution throughout the area A substation needs devices such a
10. s the following intelligent electronic devices Potential transformers PT Current transformers CT Main transformers Disconnecting switches DS Circuit breakers CB Ss S SCS S SCS S Os S SCS S Incoming Source Incoming Source 2 Outgoing Sour 3 230 kV Bus for Current Transformer rr Potential Transformer Transformer Disconnecting Switch C Circuit Breaker Figure 2 Block diagram of a primary substation ISSN 2278 7798 C Interfacing between SCADA and substation control Distribution system is concerned with hardware components such as generator transformers transmission lines and circuit breakers etc SCADA system has participated with software packages and main target is for supervisory control and data acquisition For this reasons distribution system components must connect to the various sensing devices such as CTs PTs for collecting data from the power lines There are interfaces to substation intelligent electronic devices IEDs to acquire data determine the operation status of each IED and interface to the energy management system EMS to receive data from the substation integration and automation system at different periodicities The system must interface with all of the IEDs in the substation This includes polling the IEDs for readings and event notifications The data from all the IEDs must be sent to the utility enterprise to populate the data w
11. the master station the operator can know the total load energy production per generator frequency overloading at the substation or transformers and losses etc SCADA or EMS system is immediately necessary for survival of power utilities in metropolitan cities Effective power distribution without SCADA system will be difficult 1 2 3 4 V REFERENCE SCADA Supervisory Control and Data Acquisition Stuart A Boyer Isa 2009 Wang Huazhong Supervisory Control and Data Acquisition SCADA System and Its Application M Beijing Electronic Industry Press 2010 Sheng Shoulin RMON Principles of Power System M Beijing China Electric Power Press 1998 ISSN 2278 7798 5 6 7 8 9 10 11 12 13 Mohamed Awad and Awad I Ibrahim PC Based SCADA Simulator for Distribution System Analysis IEEE Matthias Seitz Translated by ABB China Co Ltd Programmable Controller Application Tutorial M Beijing Beijing Machinery Industry Press 2009 FameView User Manual M Beijing Jiekong Technology Co Ltd 2009 Wang Huazhong Supervisory Control and Data Acquisition SCADA System and Its Application M Beijing Electronic Industry Press 2010 Sheng Shoulin RMON Principles of Power System M Beijing China Electric Power Press 1998 Weinberger Sharon Powerless in Gaza IEEE Spectrum America Dec_2009 84 Bailey David and Wright Edwin Practical SCADA for Industry Newnes 2003
Download Pdf Manuals
Related Search