Research - Dept. of Electrical Engg.

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Browsing Research - Dept. of Electrical Engg. by Author "Qureshi, Tahoora"

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    Overview to Electrical Substation Automation Using SCADA
    (Proceeding of NCATM-2017, 2017-03-24) Qureshi, Tahoora
    Abstract—“Supervisory control and data acquisition (SCADA) system” is universally accepted means of control for electrical substation which involves continual real time monitoring applicable to generation, transmission and distribution systems. The heart of SCADA lies in the functioning of Remote Terminal Units (RTUs) which collects analog and status telemetry data from field devices and also communicates command signals to them. The inclusion of automation in electrical substation has resulted in a string of advantages including visibility of network operation, flexibility of controls, real time accurate and consistent data, statistical data archiving, faster fault identification, isolation and system restoration. Complex design of SCADA systems involve accurate matching of protocols and communication parameters between connecting devices. This paper aims at establishing a basic understanding of SCADA components, communication protocols and architectures, standards employed and the security risks involved in such systems. Keywords—SCADA, Electrical Substation Automation, Communication Protocols, SCADA standards Organisation, SCADA Architecture.
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    Review on secondary and tertiary control structures for Microgrid
    (International Journal of Computer Sciences and Engineering, 2018-03-30) Qureshi, Tahoora; Alvi, Rizwan
    Abstract— With the large scale integration of Distributed Energy Resources (DERs) into the existing power system, there has been a significant impact on the operation of distribution networks; the major impacts being power quality problem along with congestion and voltage regulation issues. This demands coordinated control approaches which allow Distributed Generation (DG) units to actively participate in voltage and frequency regulation. To realize the same, hierarchical control structures constituting the primary, secondary and tertiary control structures are implemented. These controllers are classified as the centralized or the decentralized type. Thus by employing droop controls or impedance based controls desirable outcomes such as power sharing, non linear load sharing and harmonic reduction is possible thanks to coordinated operation of secondary and tertiary control layers with primary or local layer. This paper aims at establishing a basic understanding of these control layers as applied to AC and DC microgrids along with detailed explanation of modified structures from the conventional control structures in a typical microgrid.