No abstract

Instead of transmission lines expansion or building new substations in our present transmission system, the proper installation of FACTS (Flexible AC Transmission Systems) seems to be a promising strategy to support transient stability and increasing power demand. This paper narrates a correlative performance of traditional devices (AVR, TG, and PSS) with series FACTS controller on electric power network.Here, IEEE-14 bus system is considered to be the benchmark of the power network. This proposed approach is implemented with the power system analysis toolkit (PSAT) software and is applied to small case studies, IEEE 14-Bus. For the performance analysis the Eigen value analysis and time domain simulation results are compared for result validation. Results revealed that FACTS controller improve better stability as compared to other conventional used devices.

No abstract

Energy crises refers to any shortfall in the supply of energy resources to an economy. To counter these crises, renewable energy resources provide a significant potential. As most of the renewable energy resources never die, so we can obtain continuous supply from these sources. Among these sources, solar energy provides greater potential for electrical power. To use solar energy, one of the best approach is to design Parabolic Solar Dish which is more efficient than other solar technologies. In order to get maximum power output, needs to keep the dish aligned with the sun. This paper deals with the generation of electricity using parabolic shaped dish. A model is designed which contains a solar parabolic shaped dish, Stirling engine, dynamo and a solar tracker. Solar energy is focused on the cylinder of a Stirling engine which is attached at the focal point of the dish. This Stirling Engine is coupled to a Dynamo through a rubber belt and the dynamo produces output. Moreover a Solar Tracker Circuit is designed which rotates the dish automatically in the direction of sun. This reduces the use of fossil fuels and have greater efficiency.

Background: Fistula-in-ano is defined as an epithelized abnormal tract connecting two surfaces; usually the rectal mucosa and perianal skin. The primary treatment for fistula is surgery for which many options are available. However, in this article, we will be discussing the comparison between LIFT and fistulectomy. Aim: To compare a conventional invasive technique of fistulectomy with a newly introduced minimally invasive LIFT procedure in terms of operative time, hospital stay, postoperative complications, and follow-up. Methods: A retrospective view of 135 patients was done who were operated on either by LIFT (n=59) (Group L) or fistulectomy (n=76) (Group F) over the period of three years and a comparison between two techniques was performed using Student’s t-test or Mann-Whitney test for continuous variables and Fisher’s exact test for categorical variables. Results: Our operative time for LIFT was greater than the fistulectomy. Post-operative pain was analyzed using the VAS pain scale, where Group L experienced less post-operative pain. Group F patients’ wounds took longer to heal as compared to Group L patients. Hence group L (LIFT) returned to work earlier. Post-operative complications such as wound discharge were reported more in Group F than in Group L. Same was observed in the case of post-operative infection rate. Two cases of wound granulation were observed in the case of LIFT (Group L) at one-month follow-up and one case of incontinence to flatus in the Group F group was documented at three-month follow-up in the patient's record. Thirty-seven patients’ complained of itching in Group F compared to 10 in Group L. Patients who had seton, complained of setons related problems. Conclusion: LIFT was a promising and sphincter-saving technique that was simple and easy to learn with faster healing rates and better patient contentment. Keywords: LIFT, fistulectomy, fistula-in-ano