Power Research

P. Elanchezhian ¹, V. Kumar Chinnaiyan ², R. Sudhir Kumar ³

Affiliations
1 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore - 560080, IN
2 Professor & HOD, EEE Department, KPR Institute of Engineering and Technology, Coimbatore - 641047, IN
3 Joint Director, Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore - 560080, IN

Abstract

PV generation is one of the fast growing renewable generation system to avoid the energy shortage. The micro-inverter system is best option for maximum energy harvest from each solar panel and easily we can expand the installed capacity. Now a day it is playing big role in rooftop system. These inverters divided as a single stage and double stage micro inverter. Compare to single stage double stage system having high efficiency with regulated waveforms. Interleaved flyback boost converter topology is used for improve the efficiency. Converter is high step up dc-dc boost with MPPT, MPPT is used to vary the duty cycle to generate maximum power from each panel both healthy and partial shading condition. MPPT voltage range from 27 V to 45 V, for 200 W, lower maintenance cost and higher energy yield with open-circuit voltage below 45 V. Micro-inverter PV system can achieve up to 25% lower energy cost compared to the conventional central inverter system

Keywords

MPPT; micro-inverter; AC panel; flyback; interleaved

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S. Jayandiran ¹, R. Karpagam ², P. Elanchezhian ³

Affiliations
1 EEE Department, University College of Engineering, Kanchipuram-631552, IN
2 Associate professor, Easwari Engineering College, Chennai-600089, IN
3 Senior Research Fellow, ERED, CPRI, Bangalore-560 080, IN

Abstract

This paper deals with digital simulation of phase shifted series resonant DC to DC converter using Matlab Simulink^TM. The simulink models for open loop and closed loop systems are developed and they are used for simulation studies. Normally single voltage feedback is required for the system. This system consists of two control loops with one inner resonant vector and one outer voltage loop. The dynamic response improved by this dual loop method. This converter is capable of producing ripple free DC output. Switching losses and switching stresses are reduced by using soft switching. This converter has advantages like high power density and low switching losses. Theoretical predictions are well supported by the simulation results.

Keywords

Dynamic performance, dynamic response, phase shifted series resonant converter, quasi current mode control, soft switching.

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P. Elanchezhian ¹, V. Kumar Chinnaiyan ²

Affiliations
1 Energy Efficiency and Renewable Energy Division, CPRI, Bangalore-560080, IN
2 Professor & HOD, EEE Department, KPR Institute of Engineering and Technology, Coimbatore-641047, IN

Abstract

The Single-Ended (SE) resonant microinverter is a type of class E parallel resonant inverter and popularly used in many applications due to its lower cost structure and relatively high efficiency. However, its maximum power rating should be limited because the resonant voltage of SE resonant inverter increases as its power increases. Consequently, the maximum power rating of SE resonant inverter should be limited up to around 2 kW. This paper proposes an interleaved single-ended resonant inverter for the photovoltaic applications. The proposed inverter can provide two times higher output power than the conventional single-ended resonant inverter. A burst mode control enhances the power control range from very light load to full load and can improve efficiency.

Keywords

Burst mode, Single-Ended(SE), interleaved, class E, resonant converter

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P. Elanchezhian ¹, V. Kumar Chinnaiyan ², R. Sudhir Kumar ³

Affiliations
1 SRF, Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore - 560080, IN
2 Professor & HOD, EEE Department, KPR Institute of Engineering and Technology, Coimbatore - 641047, IN
3 EO 4, Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore - 560080, IN

Abstract

The Photovoltaic (PV) systems have been realized using different architectures, starting with the string and centralized PV system to the modular PV system. Presently, decentralized inverters are being developed at the PV panel power level (known as AC – PV Modules). Such new PV systems are becoming more attractive and many expect this will be the trend of the future. The AC-Module PV system consists of an inverter attached to one PV panel. This integration requires that both devices have the same life-span. Although, the available commercial inverters have a relatively short life-span (10 years) compared to the 25 –year PV. It has been stated in literature that the energy storage capacitor (electrolytic type) in the single-phase inverter is the most vulnerable electronic component. Hence, many techniques such as (power decoupling techniques) have been proposed to solve this problem by replacing the large electrolytic capacitor with a small film capacitor. This paper will present a quick review of these power decoupling techniques, and proposes a new three-port micro-inverter with power decoupling capability for AC-module PV system applications.

Keywords

AC-Module, MPPT, power decoupling, fly-back converter

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P. Elanchezhian ¹, V. Kumar Chinnaiyan ², R. Sudhir Kumar ³, J. Karpagam ⁴

Affiliations
1 SRF, Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore - 560 080, IN
2 Professor & HOD, EEE Department, KPR Institute of Engineering and Technology, Coimbatore - 641047, Tamil Nadu, IN
3 EO 4, Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore - 560 080, IN
4 Professor, ECE Department, KPR Institute of Engineering and Technology, Coimbatore - 641 407, Tamil Nadu, IN

Abstract

Solar energy is one of the cleanest and reliable sources of renewable energy on earth. Conventionally, extraction of solar power for electricity generation was limited to PV farms, however lately distributed generation form of solar power has emerged in the form of residential and commercial Grid Tied micro-inverters. Micro inverters temperature is strongly correlated with ambient temperature and PV module temperature, and moderately correlated with irradiance and AC power. Ambient temperature is the influencing factor under conditions of low irradiance in morning hours, when the irradiance is below 60 W/m2. Noon time data analysis reveals that the micro inverters thermal behaviour is more strongly influenced by PV module temperature than AC power. In this paper review about electrical circuit topology and Influence of irradiance, AC power, ambient temperature on PV module and micro inverter are discussed.

Keywords

PV module, MPPT, dual-axis, irradiance, CTP, DC-DC converter

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