Informatics Publishing Limited

Vani Vijay ¹, Sudhir Kumar R. ¹, Pradeep K. ¹

Affiliations
1 Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bangalore - 560080, IN

Abstract

Electrical equipment designed for a particular environmental condition may not provide satisfactory performance under other conditions of temperature and humidity. Specifically in the case of solar PV inverters, the efficiency and other system characteristics may vary as per the extreme climatic conditions at the place of installation. Here a comparative study of solar PV inverter performance under such extreme conditions is presented in terms of system efficiency and insulation resistance. The conditions as per relevant international standards are simulated in a climatic chamber and five samples are studied for the effect of extreme temperature and humidity conditions. It is found that the insulation resistance of few samples is varying drastically which will affect the system safety. Similarly the efficiency of the system is also affected. Similarly there is considerable change in the system efficiency also.

Keywords

Solar PV Inverters, Climatic Conditions, Insulation Resistance

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Sudhakar H. S. ¹, Gujjala B. Balaraju ¹, Pradeep K. ²

Affiliations
1 Electrical Appliances Technology Division, Central Power Research Institute, Bangalore-560080, IN
2 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore-560080, IN

Abstract

Performance of a SPV system is dependent on temperature, array configuration, solar insolation, shading across it etc. The conversion of solar energy using SPV modules comes with its own problems that arise from the change in insulation conditions. These changes in insulation conditions severely affect the efficiency and output power of the SPV modules. For improving the efficiency of conversion of solar energy can be done by tracking the maximum power point of a PV module. There are so many types of MPPT charge controllers for doing this important work in SPV system. A dc-dc converter is essential in SPV system as it acts as an interface between the load and the SPV module. Three different basic types of converters are explained in this paper without any non-idealities. There are other types of dc-dc converters as well, but these converters from these three basic converters. Further by using these dc-dc converters the performance of the MPPT algorithms can be done for improving the overall efficiency of the SPV system.

Keywords

Maximum power point tracking (MPPT), Solar photovoltaic (SPV) characteristics, DC to DC converter

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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)

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H. S. Sudhakar ¹, Gujjala B. Balaraju ¹, Pradeep K. ², Siddhartha Bhatt M. ²

Affiliations
1 Electrical Appliances Technology Division, Central Power Research Institute, Bangalore-560080, IN
2 Energy Efficiency and Renewable Energy Division, Central Power Research Institute, Bangalore-560080, IN

Abstract

In large PV hybrid power systems, battery management is critical due to the continuous operation of the power system, the limited power available for temperature control in the battery room, and the high cost of maintenance.Charge controllers are required in solar or wind power generating systems where electrical energy storage is required in these systems. Optimal charging is required in order to improve the performance and life of the batteries. The charge controllers are used for optimal charging of the entire system. The different types of charge controllers, terminologies, set points and importance of hybrid system are explained in this paper. The shunt and series type charge controller’s current and voltage regulations are shown and battery current and voltage characteristics according to the source availability and load applied are also shown for the understanding.The studies of a system of the three sources (Solar, wind and diesel generator) includes than it in practice to optimize performance by 35% by optimal charging of battery using charge controller

Keywords

Charge controller, Shunt type controller, Series type controller

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