محدودیت جریان بار ، فرآیند کوئیچینگ ناهمگن، محدودک

صبری: ۰۹۳۶۷۲۹۲۲۷۶

— This paper presents a new method for tuning linear controllers such as Proportional-Integrating (PI) and Proportional-Resonant (PR) structures which are frequently used in different power electronic and power systemapplications. Those controllers are placed within a general structure offered by the Internal Model Principle (IMP) of control theory. In this paper, the first perspective uses the wellknown concept of Linear Quadratic Regulator (LQR) to address the problem as a regulation problem. Matrix of the LQR design is then finely adjusted in order to assure desired transient response for the system. The second perspective is based on redefining the LQR problem in order to make it capable of addressing the optimal tracking problem. Two specific examples of the method applications, one in a UPS inverter system and the other one in a DG system, as applied to tuning of a PR and a PI controller are studied in detail. Both examples are simulated in PSCAD and the results confirm analytical derivations. Index Terms— Tuning linear controllers, PI, PID, PR, optimal control, LQR, UPS inverter, DG. واژه ها شاخص: تنظیم کنترل خطی ، PI، PID، PR، کنترل بهینه، LQR، اینورتر UPS، DG. لینک دانلود مقاله P10--A SIMPLE METHOD FOR POWER LOSS ESTIMATION IN PWM INVERTER-FED MOTORS یک روش ساده برای برآورد تلفات توان دراینورتر PWM و موتورهای FED Ş.G. Roşu 2012 IEEE Abstract– This paper presents a simple power loss estimation method for inverter-fed low power AC asynchronous and synchronous motors. The method uses a simulation based DC/AC converter power loss estimation based on datasheet parameters and load characteristics like measured phase resistance and current phase delay. A current control scheme is used to impose a constant current at various speeds. Using this approach both asynchronous and synchronous motors can be used as a load. Total power loss is measured as the DC Link current by an amperemeter avoiding the use of complicated measurement systems. Keywords: power loss estimation, PWM parameters, Induction Motor, Synchronous Reluctance, کلید واژه ها: تخمین افت توان، پارامترهای PWM، موتور القایی، رلوکتانس سنکرون، Permanent Magnet Motor. لینک دانلود مقاله P11--A study of a two stage maximum power point tracking control of a photovoltaic system under یک مطالعه از کنترل دو مرحله ای ردیابی حداکثر نقطه توان در سیستم های فتوولتائیک لینک دانلود مقاله P12--Advanced Control Strategy of DFIG Wind Turbines استراتژی کنترل پیشرفته در DFIG توربین های بادی لینک دانلود مقاله P13--AI Based Economic Load Dispatch Incorporating Wind Power Penetration پخش بار بار اقتصادی AI بر اساس گنجاندن ضریب قدرت باد Abstract: azsoft.ir 09367292276 azsoftir@gmail.com azsoft.ir azsoft.ir 09367292276 azsoftir@gmail.com azsoft.irazsoft.ir 09367292276 azsoftir@gmail.com azsoft.ir azsoft.ir 09367292276 azsoftir@gmail.com azsoft.irazsoft.ir 09367292276 azsoftir@gmail.com azsoft.ir azsoft.ir 09367292276 azsoftir@gmail.com azsoft.irazsoft.ir 09367292276 azsoftir@gmail.com azsoft.ir azsoft.ir 09367292276 azsoftir@gmail.com azsoft.ir Economic Load Dispatch (ELD) is one of the most important problems to be solved in the operation and planning of a power system. Its objective is to schedule the power generation properly in order to minimize the total operational cost. Renewable energy resources such as wind power have significant attention in recent years in power system field. It reduces fuel consumption and also benefits in curbing emission. But wind power penetration into conventional systems due to its intermittent nature has some implications like security concerns. Thus a reasonable trade off is required between system risk and operational cost. In this paper a bi-objective economic dispatch problem considering wind power penetration is formulated. A fuzzy membership function is used to represent the dispatch of wind power into the conventional system. A particle swarm optimization algorithm, Genetic algorithm and a bacteria-foraging technique are adopted to develop a dispatch scheme compromising both the economic and security requirements. The results of all these 3 proposed techniques are compared. Numerical analyses are reported based on a typical IEEE-30-bus with six-generator test power system to show the validity and applicability of the proposed approaches. لینک دانلود مقاله P14--An Integral Battery Charger With Power Factor Correction for Electric Scoote یک شارژر انتگرالی باتری با ضریب توان برای Scooteبرقی Gianmario Pellegrino, Member, IEEE, Eric Armando, and Paolo Guglielmi, Member, IEEE IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 25, NO. 3, MARCH 2010 Abstract—This paper presents an integral battery charger for an electric scooter with high voltage batteries and interior-permanentmagnet motor traction drive. The battery charger is derived from the power hardware of the scooter, with the ac motor drive that operates as three-phase boost rectifier with power factor correction capability. The control of the charger is also integrated into the scooter control firmware that is implemented on a fixed-point DSP controller. Current-controlled or voltage-controlled charge modes are actuated according to the requirements of the battery management system, that is embedded into the battery pack. With respect to previous integrated chargers, the ac current is absorbed at unitary power factor with no harmonic distortion. Moreover,no additional filtering is needed since the pulsewidth modulation ripple is minimized by means of phase interleaving. The feasibility of the integral charger with different ac motors (induction motor, surface-mounted phase modulation motor) is also discussed, by means of a general model purposely developed for three-phase ac machines. The effectiveness of the proposed battery charger is experimentally demonstrated on a prototype electric scooter,equipped with two Li-ion battery packs rated 260 V, 20 Ah. Index Terms—AC motor drives, AC motor modelling, ac–dc power conversion, battery chargers, interleaved converter, road vehicle electric propulsion. واژه ها شاخص: درایو موتور AC، مدل AC موتور،مبدل AC-DC قدرت، شارژر باتری، مبدل لایه ای، وسیله نقلیه جاده ای. لینک دانلود مقاله P15--Analysis of 3-Phase Superconducting Fault Current Limiters in Power Systems With Inhomogeneous Quenching تجزیه و تحلیل 3 فاز ابررسانا جریان محدود کننده در سیستم های قدرت ناهمگن Diaa-Eldin A. Mansour,Member, IEEE, and Doaa M. Yehia IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, VOL. 23, NO. 3,JUNE 2013 Abstract—The limitation behavior of a 3-phase superconducting fault current limiter (SFCL) in power systems is greatly affected by inhomogeneous quenching among phases, where it can lead to increasing current limitation burden upon some phase units.Accordingly, this paper aims to analyze the behavior of SFCL with inhomogeneous quenching among phases. A model is developed for the resistive type SFCL using PSCAD/EMTDC software considering the transition from superconducting state to normal conducting state through flux flow state. Inhomogeneous quenching is represented in two different ways, either as an inhomogeneity in Ic value or an inhomogeneity innvalue. Different types of faults including symmetrical and unsymmetrical faults are studied. For each case, the influence of inhomogeneous quenching on current limitation and corresponding voltage drop across units is evaluated. From the obtained results, it is found that the most severe case appears for line-to-line fault. Therefore, the effect of inhomogeneity degree is discussed for this fault type. Index Terms—Current limitation burden, inhomogeneous quenching, superconducting fault current limiter (SFCL),symmetrical, unsymmetrical faults. واژه ها شاخص: محدودیت جریان بار ، فرآیند کوئیچینگ ناهمگن، محدودکننده جریان خطا ابررسانا (SFCL)، متقارن، خطاهای نامتقارن. لینک دانلود مقاله P16-- Ant colony optimi