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Text | A High Step up Converter for Grid Connected Photovoltaic Generation System | 001
ISSN (Print) : 2320 – 3765 ISSN (Online): 2278 – 8875
International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering
(An ISO 3297: 2007 Certified Organization)
Vol. 3, Issue 4, April 2014
A High Step up Converter for Grid Connected Photovoltaic Generation System
C.Ramya1, M.Benazir2, B.Priya3
PG Student [PED], Dept. of EEE, Kings College of Engineering, Thanjavur, Tamilnadu, India 1 PG Student [PED], Dept. of EEE, Kings College of Engineering, Thanjavur, Tamilnadu, India2 Assistant professor, Dept. of EEE, Kings College of Engineering, Thanjavur, Tamilnadu, India3
ABSTRACT:A high step up converter is proposed for grid connected photovoltaic generation system.An asymmetrical interleaved technique is proposed for high step up gain with high efficiency.A high step-up converter adopts boost converter with interleaved mode and a coupled inductor to increase its step-up voltage ratio. The interleaving technique connects the converter in parallel to share the power flow, this reduce the size , weight, and volume of the inductors and capacitors.Without using of high duty ratio this converter achieves a high step-up voltage-conversion ratio through a coupled inductor and the converter. The boost converter is placed in the first phase to achieve a higher voltage conversion ratio. This two phase formation is used to reduce the current stress, current ripple and also the conduction losses of metal oxide semiconductor field effect transistors (MOSFET). The Conversion efficiency is high because the leakage inductances are recycled to the output terminal. The main requirements of this Pv application is small ripples in the generator and load as well as high voltage conversion ratio.
KEYWORDS: Boost converter, MOSFET, coupled inductor, Photovoltaic system. I.INTRODUCTION
Renewable energy attracts interest for power generation because the non renewable energy like petrol, diesels etc are diminishing and energy crisis is an important concern in most of the nations.In renewable energy, solar energy attracts more because it has more advantage compare to other renewable energy s like the selection of area is not complicated, the systems can either be operated as isolated systems or connected to the grid as a part of an integrated system, it has no moving parts; it has a long lifetime and low maintenance requirements and most importantly it is one solution that offers eco friendly power . Photovoltaic system requires a power electronics interface to be connected to the grid. The most commonly used dc/dc converter is a boost converter which provides an acceptable voltage conversion ratio and also requests a continuous current from the power source . The characteristics required in photovoltaic applications are low current ripple injected to the power source and high conversion efficiency. In the photovoltaic case, the current ripple impacts the power generation since it produces an oscillation around the Maximum Power Point (MPP) reducing the energy extracted from the photovoltaic generator . Those characteristics make the boost converter a good candidate to interface the photovoltaic systems. Additionally it requires filter between the power generator and the power converter, increasing also the power losses, size, weight, cost and order of the system. Another possibility to reduce the converter’s input current ripple is given by the interleaving structures.
The interleaving technique connects dc/dc converters in parallel to share the power flow between two or more conversion chains.However, the conventional interleaved converter has some disadvantages like the duty ratio is extremely large in order to get a high gain, this increases the current ripple, conduction losses and the turnoff losses. Then, the switches voltage stress is the high and the output diode reverse-recovery problem is very severe, which induces additional voltage and current stresses and losses and also the electromagnetic interference (EMI) noise is very serious.To improve voltage gain interleaved structures can be used with transformers or the inductors . Interleaved converters is able to reduce output current ripple without any modification on the PWM technique (need phase shift only) and circuit theory of boost converter -. When the duty cycle is high the voltage gain is theoretically infinite. So the switch turn on period becomes long as the duty cycle (D) increases causing conduction losses to increase. The single switch boost converter power rating is limited to switch rating . Interleaved parallel topology is the solution to increase the power and reduce input current ripple allowing lower power rated switches to be used.
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