Publications

Abstract: In deregulated structure, power system network has become more complex with free trades amongst GENCOs and DISCOs and with increasing penetration of Renewable Energy Sources. These complexities might impose risk on security and stability of the network especially during congestion hours. This paper presents an economical and secure congestion management approach, in hybrid power system; by considering linear piece-wise hydro model and probabilistic wind generation model. Impact of wind participation in congestion management and bidding's effect on congestion cost has been analyzed. Minimization of congestion cost has been formed as major objective and problem has been formulated as Mixed Integer Non Linear Programming (MINLP) problem which has been tested on modified IEEE-24 bus RTS system. Locational dependence of congestion cost and a comparison of VSM based approach with conventional congestion management approach have also been presented.

Abstract:

Restructuring of Electric Supply Industry (ESI) is taking place all over the world in different rates and shapes. Restructuring includes both privatization and deregulation (competition). Though, deregulation of Electricity sector brought a competitiveness, which proved good for the growth of Electricity sector as a whole, amongst its so called players, that includes GENCOs, TRANSCOs and DISCOMs. But at the same time buyers, due to now available capability to choose between different sellers, want to get the cheapest electricity. This natural tendency to get cheapest electricity actually resulted in magnifying some network problems; congestion of transmission lines is one of them.

Furthermore, in today's era where Renewable Energy Sources (RESs) are gaining more and more attention due to their clean and subsidized power, this congestion problem gets even worse. Intermittent nature of Renewable Energy Sources makes the job of the Independent System Operator (ISO) more complex. ISO has the responsibility to ensure secure, reliable and economic power dispatch, for which ISO makes plans for power dispatch beforehand for day-ahead market. But, again presence of intermittent RES in the system makes it an important aspect to study their impact on congestion management. In this work, same has been done by considering Wind and Hydro power plants in the system. The current work examines how wind power source's presence on the system can impact congestion management. For this probabilistic wind power has been considered and results are also obtained in the presence of wind considering 24 hour variation in wind power and seasonal load considering winter, spring, summer and fall seasons.

When it comes to critical issues like congestion of transmission lines, there is need to explore all possible ways to deal with it. Therefore, FACTS (Flexible AC Transmission Systems) controllers' application in the existing network and demand response techniques to encourage participation from load end as well comes to mind. In this work three different FACTS controllers viz. STATCOM, SSSC and UPFC are considered and their impact on congestion management in a system with wind generation has also been studied. Demand response techniques have also been analyzed in context of congestion removal.

For details on my latest publications please feel free to contact me. Also, If you are interested in collaborating with me to carry out some research project relevant to my research area, drop an email at rahul.sagwal@itgopeshwar.ac.in or reach me through "contact me" page. I would be very happy to communicate on further details.