Tilt Integral Derivative Controller Optimized by Battle Royale Optimization for Wind Generator Connected to Grid

Globally the countries are focusing on reducing the carbon footprint leading to a greater effort for electrical energy generation by renewable energy sources, particularly wind. The wind turbines are invariably using doubly fed asynchronous generator. In this paper a controller has been designed for a doubly fed induction motor. The proposed Tilt Integral Derivate controller for was compared with commonly used PI, PID controllers. Several optimization algorithms were used for tuning of controllers and the best one was selected for each type of controller. The controller has been optimized using battlefield optimization. It had been compared with proportional integral controller, fractional order proportional integral derivative controller. Other controllers were optimized using meta heuristic algorithms. The controller enhanced the system response in terms of settling time, rise time and other parameters. The Tilt controller gave the overall superior performance in terms of parameters like rise time, settling time, settling minimum, peak, and peak time. The results were obtained using MATLAB. This paper discusses operation of doubly fed induction motor operation and optimization methods

Bile spillage during laparoscopic cholecystectomy: Risk factors and increased post-operative morbidity

Introduction: Laparoscopic cholecystectomy has become the “gold standard” for the management of symptomatic cholelithiasis. Bile spillage is common due to perforation during dissection of the gallbladder bed, injury during retraction with grasping forceps and during specimen retrieval. We evaluated the risk factors and presumed that bile spillage increases the risk of immediate post-operative morbidity. Method: 60 Patients of symptomatic cholelithiasis admitted to JNMCH, Aligarh for laparoscopic cholecystectomy from 04/2021 to 09/2021, were prospectively included. We compared those who had bile spillage during the operation to those who did not. Our aim was to find out the risks of bile spillage and rate of early post operative complication due to bile spillage in both the groups. Results: Bile was spilled intraoperatively in 36 patients (60.0%), with hydrops noted in 5 (8.3%) and empyema in 10 (16.6%) of them. In 9 (15%) out of 60 patients, BS was accompanied by stone spillage. Patients with BS were older and were more frequently male. Conversion to open was more likely in operations with BS (14% vs 4%). Bile spillage was associated with a higher risk of postoperative abdominal pain, tenderness, paralytic ileus and SSI rate (8 % vs 2%, p = 0.001) and longer hospital stay (median of 3 vs 2 days, p < 0.001). Conclusion: Bile spillage should be anticipated in presence of risk factors and is associated with increased risk of post operative morbidity. Surgeons should try to avoid it during laparoscopic cholecystectomy