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Prasad J.V.,Dhanekula Institute of Engineering and Technology
2013 International Conference on Energy Efficient Technologies for Sustainability, ICEETS 2013 | Year: 2013

In deregulated power systems, maintenance of sufficient security margin and reliability level are the major tasks of the independent system operator (ISO). The provision of bids change at any time in the competitive market makes the power injections and withdrawals are time variant and are mainly determined based on economic grounds only. In order to maintain security and reliability, the adjustable markets and ancillary service markets are also becomes an integral part in the general power market clearing mechanisms. This paper is addressing the combined market model to assess the spinning reserve (SR). The deterministic approach is adapted to require SR in the system. The competitive power market is applied to all the markets independently and later they are integrated in to one common optimal solution. The proposed approach is discussed on IEEE-14 bus system. © 2013 IEEE. Source


Prasad J.V.,Dhanekula Institute of Engineering and Technology | Sekhar K.C.,P.A. College
Proceedings of 2013 International Conference on Power, Energy and Control, ICPEC 2013 | Year: 2013

Currently, most of the power systems operate under deregulation environment. This mode of operation leads the power systems in to unpredictable and sometimes unsecured states with the competition among market participants in addition to the uncertainties. The maintenance of acceptable range of bus voltage magnitudes and transmission congestion management are become essential preventive tasks to the system operator to drive the competitive electricity market schedule. Due to the lack of reactive power support and transmission system capacity, the networks could also subject to voltage instability. In order to improve the transmission system loadability even under line outage contingencies, this paper addressing the application of flexible ac transmission system (FACTS) devices. Based on the impact on critical loading margin (CLM), the contingencies have been ranked. The critical loading margin is determined using repeated power flow (RPF) method and possible improvement is achieved with various FACTS devices in the network. SVC, TCSC, TCPST and UPFC devices have been considered to install in the network. © 2013 IEEE. Source


Ram I.S.,Dhanekula Institute of Engineering and Technology | Amarnath J.,Jawaharlal Nehru Technological University
2013 Nirma University International Conference on Engineering, NUiCONE 2013 | Year: 2013

The voltage collapse problem can avoid by providing proper reactive power resources to maintain specified voltage profile in the network. The traditional approaches are not sufficient to mitigate reactive power imbalance in the modern power system. Hence one of the emerging technologies like integration of Flexible AC Transmission System (FACTS) devices has been adopted in this paper. A hybrid algorithm is proposed to improve voltage stability of power system and to optimize the FACTS controllers. This Hybrid algorithm intended by the combination of genetic algorithm (GA) and gravitational search algorithm (GSA). For the implementation of this technique, one of the FACTS devices namely Unified power flow controller (UPFC) is selected. The GA is applied to identify best locations of UPFC and later GSA is implemented to optimize UPFC ratings in a sequential manner. The proposed method is implemented on IEEE-30 bus system using MATLAB working platform. The results have shown the effectiveness of proposed algorithm for practical applications. © 2013 IEEE. Source


Shanmukha Rao L.,Dhanekula Institute of Engineering and Technology | Ramana N.V.,JNTUH College of Engineering
International Review on Modelling and Simulations | Year: 2013

This paper deals with major problem of load frequency control in two area deregulated hydro thermal system and unveils a new solution called sliding mode control strategy as an advanced technique. The proposed new control strategy will manage nonlinearities and uncertainties in the measurement of certain system states of the highly non linear power system. This optimal sliding mode controller tested on two area hydro thermal deregulated power system that includes bilateral contact when the system undergoes sudden disturbance. The performance of proposed new Optimal sliding mode controller has been compared with sliding mode observer based optimal controller and Conventional PI controller. © 2013 Praise Worthy Prize S.r.l. - All rights reserved. Source


Shanmukharao L.,Dhanekula Institute of Engineering and Technology | Ramana N.V.,JNTUH College of Engineering
PEDES 2012 - IEEE International Conference on Power Electronics, Drives and Energy Systems | Year: 2012

In this paper three control areas are considered, each area contains one hydro and one thermal system. All the three areas are connected with the help of HVDC link. Automatic Generation Control (AGC)problem formulation is affected with open transmission access and evaluation of more socialized companies for generation, transmission and distribution. Therefore conventional three area system is modified so that it will consider the effect of bilateral contract on dynamics. Dynamic analysis is carried out on three area hydrothermal system with HVDC link as well as with AC tie line. It is observed that dynamic response of three area hydro thermal system connected with AC tie line is sluggish and degraded compared with HVDC link. © 2012 IEEE. Source

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