A micro grid (MG) system that benefits from distributed generation (DG) resources has a non-linear and time-varying nature which encounters the control problem with some difficulties. Also, due to the fact that in the most MG systems the frequency controllers are centra More
A micro grid (MG) system that benefits from distributed generation (DG) resources has a non-linear and time-varying nature which encounters the control problem with some difficulties. Also, due to the fact that in the most MG systems the frequency controllers are centralized in the control room and, the DGs are located at distances from the control room, the occurrence of delay is undeniable and it should be considered in the design of the controller. For this purpose, a self-tuning fuzzy PID controller has been designed for load frequency control in a MG system in the presence of delay. The designed fuzzy PID controller is a nonlinear controller and can handle the nonlinearities. To deal with the delay in the input of the system, the Ziegler-Nichols like criteria has been utilized to derive the adaptive mechanism which tunes the scaling factors according to the maximum amount of delay in the online manner. The proposed self-tuning fuzzy PID controller has been applied for load frequency control of a time-delay MG system and the simulation results have been compared with the results of fixed structure fuzzy PID controller. The simulation results indicate the efficiency of the proposed controllers in dealing with time-varying delay.
Manuscript profile
Considering the widespread use of diagrid systems in high-rise buildings, it seems necessary to investigate the behavior of this structural system against the wind and control comfort criteria based on acceleration. The purpose of this research is to compare the comfort More
Considering the widespread use of diagrid systems in high-rise buildings, it seems necessary to investigate the behavior of this structural system against the wind and control comfort criteria based on acceleration. The purpose of this research is to compare the comfort criterion based on acceleration in the diagrid system with the tube system. For this purpose, the effect of various parameters such as the acceleration of floors and base shear under dynamic wind load has been evaluated. It is expected that the performance of the diagonal network will be evaluated with a more detailed understanding of the diagonal network in tall structures and the evaluation of the performance and comfort criteria based on the acceleration against the wind load using the dynamic analysis of time history using Cholsky, ergodic and AP methods. Investigations show that the acceleration of the diagrid system floors, based on the ASCE7 wind dynamic response prediction equations, has exceeded the permissible limit of the ASCE 7 regulation of milli-g20. This article is due to the overestimation of ASCE 7 equations compared to the results of wind time history analysis. So, in the 50-story structure, the maximum acceleration of the roof obtained from the ASCE equation is 71.83 times the results of the dynamic analysis of wind time history, and in the 70-story structure, it is 2 times, and in the 100-story structure, it is 1.87 times the results of the dynamic analysis of the wind time history.
Manuscript profile
Considering the widespread use of diagrid systems in tall buildings, it is necessary to investigate the behavior of this structural system against the wind and control comfort criteria based on acceleration. According to different regulations, it is evident that there i More
Considering the widespread use of diagrid systems in tall buildings, it is necessary to investigate the behavior of this structural system against the wind and control comfort criteria based on acceleration. According to different regulations, it is evident that there is not much guidance for the design of this structural system and its requirements have not yet been included in the design regulations. Therefore, one of the most important goals of the current research is to investigate and use the Diagrid structural system as one of the modern structural systems in high-rise buildings. Another goal of this research is to compare the performance of the diagrid system with the environmental pipe system. Accordingly, the effect of various parameters including the acceleration of floors and shear of the base under dynamic wind load has been evaluated. It is expected that the performance of the diagonal network will be evaluated with a more detailed understanding of the diagonal network in tall structures and the evaluation of the operation and comfort criteria based on the acceleration against the wind load using dynamic time history analysis applying Cholesky, ergodic and AP methods. The results have been compared with the formulas of the ASCE7 regulation and the AIJ-GBV-2004 and ISO 10137:2007 comfort criteria and the National Building Code of Canada (NBCC). These investigations indicate that the acceleration of the diagrid system floors based on ASCE7 wind dynamic response prediction equations, has exceeded the permissible limit of ASCE 7 regulation by 20 milli-g (20Gal). This is due to the high estimation of ASCE 7 equations compared to the results of wind time history analysis. In such a way that in the 50-, 70-, and 100-story buildings, the maximum accelerations of the roof obtained from the ASCE 7 equation are 1.83, 2.07, and 1.87 times the results of the dynamic analysis of wind time history, respectively.
Manuscript profile
چیدمان تسهیلات از مسائل مهم مدیریت عملیات میباشد، بطوریکه تاثیر مستقیمی بر عملکرد مالی شرکتهای خصوصی و دولتی دارد. مسئله چیدمان تسهیلات با پارامترهای تصادفی، تسهیلات مساحت نابرابر و مدلسازی سیستم توری، مسئله ای است که قبلا بر روی آن کار نشده است. مطالعه این مسئله سهم اص More
چیدمان تسهیلات از مسائل مهم مدیریت عملیات میباشد، بطوریکه تاثیر مستقیمی بر عملکرد مالی شرکتهای خصوصی و دولتی دارد. مسئله چیدمان تسهیلات با پارامترهای تصادفی، تسهیلات مساحت نابرابر و مدلسازی سیستم توری، مسئله ای است که قبلا بر روی آن کار نشده است. مطالعه این مسئله سهم اصلی این مقاله است. در این مقاله، ابتدا یک مدل برنامه ریزی ریاضی عدد صحیح غیرخطی تصادفی ارائه شده است که تابع هدف آن کمینه سازی هزینه های کل جریان مواد میان تسهیلات است.سپس یک الگوریتم فراابتکاری مبتنی بر شبیه سازی تبرید ارائه شده است. الگوریتم پیشنهادی قادر است تا با استفاده از رویه های تولید جواب موجه و عملگر جست و جوی همسایگی جواب های با کیفیت بالا در مدت زمان اندک را تولید نماید. حل مسائل گوناگون با اندازه های متفاوت در کنار یک مطالعه موردی واقعی، کارایی الگوریتم در حل اینگونه مسائل را نشان میدهد.
Manuscript profile
Sanad
Sanad is a platform for managing Azad University publications
