Power Research

K. J. Shruthi ¹, P. Giridhar Kini ², C. Viswanatha ³, Rajashekar P. Mandi ⁴

Affiliations
1 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore- 560080, IN
2 E&E department, Manipal Institute of Technology, Manipal 576104, IN
3 Diagnostics Cables and capacitors Division, Central Power Research Institute, Bangalore 560080, IN
4 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore -560080, IN

Abstract

Renewable energies are the most sought after alternatives for electric energy generation. The improvement in semiconductor and power electronics technology has led to precise operation of system at maximum power point, thus increasing the efficiency of the PV system. Many maximum power point tracking (MPPT) algorithms have been developed in recent times which provide maximum power tracking under varying conditions. Among the existing algorithms, perturb and observe (P & O) is the most explored technique. In this paper a comparison between the conventional P & O and improved P & O method is brought about. A MATLAB simulink based simulation study of PV module/ array is carried out and both the MPPT algorithms are explored for z-source inverter in photovoltaic system.

Keywords

Solar Photovoltaic (SPV) system, Modeling of PV arrays, Z-source inverter (ZSI), Perturb and Observe (P & O), Improved perturb and observe (IP & O), Maximum power point tracking (MPPT)

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K. J. Shruthi ¹, Rajashekar P. Mandi ¹, Pradeep K. ¹, C. Viswanatha ², Kini P. Giridhar ³

Affiliations
1 Energy efficiency and Renewable Energy Division (ERED), Central Power Research Institute, Bangalore-560080, IN
2 Diagnostics Cables and Capacitors Division (DCCD), Central Power Research Institute, Bangalore-560080, IN
3 Professor, Electrical and Electronics Engineering Dept., Manipal Institute of Technology, Manipal, IN

Abstract

The key requirements for the control of the solar photovoltaic (SPV) energy conversion systems are to achieve very fast yet quite accurate tracking of the maximum power point under rapidly changing environmental conditions and to obtain efficient unperturbed tracking operation under steady environmental conditions. In this work, a high-performance Maximum Power Point Tracking (MPPT) technique, based on one cycle control (OCC), is proposed to meet these challenging requirements. This paper proposes single phase z-source inverter with maximum power point tracking using OCC for solar photovoltaic power generation. OCC is based on output current adjustment according to the voltage of photovoltaic array so as to extract the maximum power from it. A 1 kW grid-tied roof-top system is designed using the OCC method for MPP. Analysis & simulation using MATLAB tool, is carried out to validate the proposed technique.

Keywords

Grid-tied transformerless inverter, photovoltaic (PV) system, z-source network, Maximum power point tracking (MPPT), One Cycle Control (OCC)

Full Text

     

K. J. Shruthi ¹, Rajashekar P. Mandi ¹, C. Viswanatha ², Giridhar P. Kini ³

Affiliations
1 Energy efficiency and Renewable Energy Division (ERED), Central Power Research Institute, Bangalore - 560 080, IN
2 Diagnostics Cables and Capacitors Division (DCCD), Central Power Research Institute, Bangalore - 560 080, IN
3 Professor, Electrical and Electronics Engineering Dept., Manipal Institute of Technology, Manipal - 576 104, IN

Abstract

This paper discusses the various inverter topologies used in solar photovoltaic system for electrical energy. This paper gives comparison between the conventional type of inverters i.e. voltage source inverter (VSI) and current source inverter (CSI) .New z-source inverter topology is proposed which will overcome the drawbacks in VSI and CSI. Pulse width modulated (PWM) signals are generated for the power semiconductor switches of the z-source inverter for controlling the power to the grid. The characteristics of this inverter are used to obtain maximum power tracking control and delivering to the grid.

Keywords

Inverter, Photovoltaic (PV) System, z-source network, pulse width modulation (PWM)

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