انجام پروژه متلب | متلبی

Abstract—To achieve the best optimized performance in terms
of stability and dynamic behavior of power electronics converters, it is necessary to use a more advanced control technique
and accurate mathematical model. This paper propose a fixed
frequency hysteretic current (FFHC) controller that uses both
sliding mode control (SMC) technique and fixed frequency
current controller with a hysteresis band to achieve all properties
of the variable structure controller. However, realizing such fixed
frequency sliding mode controller using small-signal averaged
(SSA) model of the power converters and Utkin’s equivalent
control technique may not be valid for all conditions. We show
that it can be applicable only when the fast scale dynamics of the
converter system is stable, which can be achieved successfully by
analyzing the stability of the FFHC controlled buck converter
using Filippov method and Floquet theory. The regions of
stability are then presented to show the domains of existence
of nominal period-1 and higher periodic orbits in 2-dimensional
(2-D) parameter space. We also demonstrate how to derive the
equivalent control law from modified tristate converter topology
to design the controller. Finally, the experimental results are
presented to validate the effectiveness of this hybrid FFHC
controller.
Index Terms—DC-DC buck converter, fixed frequency hysteretic current (FFHC) control , sliding motion (SM), sliding
mode control (SMC), multi-scale oscillation, discontinuous systems

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انجام پروژه متلب

کد مقاله g161
عنوان مقاله:

High step-up isolated efficient single switch DC-DC converter for renewable energy source

سال ارائه:  2014       نوع مقاله: ژورنال               گزارش فارسی: دارد
کلید واژه : 

مبدل DC به DC Single switch DC-DC , converter , High step-up , Clamp circui , Reverse-recovery , پروژه متلب , شبیه سازی با متلب ,, PSIM

Abstract In this paper, an isolated high step-up single switch DC-DC converter for renewable
energy source is proposed. In the proposed converter high step-up voltage is obtained by single
power switching technique that operates low duty cycle with isolated transformer inductors and
switched capacitors and power diodes. The disadvantage of conventional converters is that it has
high duty ratio and high voltage stress on power devices with less efficiency. The proposed converter
eliminates the switching losses and recycles the leakage energy which includes reverse recovery
energy of the power diode by using passive clamp circuit. To achieve high output voltage gain,
the isolated transformer primary terminal and secondary terminal are connected in series during
switching operation. PSIM software has been used for simulation. Simulation circuit is analyzed
at 40Vdc/400V
dc, 200 W and this operation is validated by implementing in the hardware model
at 12Vdc/120V
dc,60W.
2014 Production and hosting by Elsevier B.V. on behalf of Ain Shams University.

KEYWORDS
Single switch DC-DC
converter;
High step-up;
Clamp circuit;
Reverse-recovery;

PSIM

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کد مقاله g162
عنوان مقاله:

A High Efficient Micro-controlled Buck Converter with Maximum Power Point Tracking for Photovoltaic Systems

سال ارائه:  2009       نوع مقاله: ژورنال               گزارش فارسی: دارد
کلید واژه : DC/DC Converter, Maximum Power Tracking, Photovoltaic Systems, پروژه متلب , شبیه سازی با متلب ,

Abstract. In recent years, the use of solar energy has
become an alternative source of energy of great importance.
Several researches and efforts have been concentrated on the
improvement of the efficiency of photovoltaic systems and in
the accessibility to this technology. In this sense, this work
presents a buck converter controlled by P&O technique for the
maximum power point tracking ofthe photovoltaic panel. The
system is simulated and implemented experimentally using a
microcontroller device. The analysis by simulations and
practical results show a good performance of the control
technique and the improvement of the efficiency of the system.
Key words
DC/DC Converter, Maximum Power Tracking,
Photovoltaic Systems.

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کد مقاله g170

عنوان مقاله:

Control of a wind energy conversion system equipped by a DFIG for active power generation and power quality improvement

سال ارائه:  2013       نوع مقاله: ژورنال                                     گزارش فارسی: دارد

کلید واژه : موج های جریان و ولتاژ شبکه و ولتاژ خازن، جبرانسازی, پروژه متلب , شبیه سازی با متلب ,

Variable speed wind turbine, AC-DC-AC PWM converter, Harmonic currents, Active filtering, Reactive power compensation, Power quality

abstract
The aim of this paper is to improve the reactive power compensation and activefiltering capability of
a Wind Energy Conversion System (WECS). The proposed algorithm is applied to a Doubly Fed Induction
Generator (DFIG) with a stator directly connected to the grid and a rotor connected to the grid through
a back-to-back AC-DC-AC PWM converter. The control strategy of the Rotor Side Converter (RSC) aims, at
first, to extract a maximum of power underfluctuating wind speed. Then, depending on the rate power
of the RSC, the power quality can be improved by compensating the reactive power and the grid
harmonics current due to nonlinear loads. Hence, the RSC is controlled in order to manage the WECS
function’s priorities, between production of the maximum active power captured from the wind, and
power quality improvement. The main goal of the proposed control strategy is to operate the RSC at its
full capacity, without any over-rating, in terms of reactive power compensation and active filtering
capability. Elsewhere, the Grid Side Converter (GSC) is controlled in such a way to guarantee a smooth DC
voltage and ensure sinusoidal current in the grid side. Simulation results show that the wind turbine can
operate at its optimum power point for a wide range of wind speed and power quality can be improved.
It has been shown also that the proposed strategy allows an operating full capacity of the RSC in terms of
reactive power compensation and activefiltering.

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