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

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

Abstract

Thepresence of Distributed Resources (DR) and the subject of Distributed Generation (DG) are rapidly growing in modern distribution networks. Many of these resources use renewable energies, and many of them provide electrical energy in the form of dc voltage source. Consequently, the connection of such resources to the utility grid needs a dc/ac conversion stage. Voltage Source Converters (VSC) are widely used for this application as they have a mature technology. These converters are usually connected to the utility grid through a simple L filter to reduce the current harmonics injected to the grid. However, higher order filters, like LCL filters, can provide better harmonic attenuation and reduce the filter size at the same time. This paper proposes a method for LCL type filter design, which makes the task very convenient. Step-by-step design procedure is described as a design example, which is verified by simulation.

Keywords

L, LCl, PCS, Micro-inverter, MIC,PWM

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Elanchezhian P. , Kumar Chinnaiyan V. , Sudhir Kumar R.

Abstract

In this paper two stage boost photovoltaic micro inverter system using maximum power point tracking is presented. First the photovoltaic module is analyzed using SIMULINK software. The main aim of the paper is the boost converter with microinverter to be used along with a Maximum Power Point Tracking control mechanism. The MPPT is responsible for extracting the maximum possible power from the photovoltaic and feed it to the load via the boost converter which is used to steps up the voltage to required magnitude. Both the boost converter, and the solar cell are modelledusing Sim Power System blocks. Here the voltage source inverter is cascaded and it injects sinusoidal current to the grid. The dynamic stiffness are obtained when load or solar insolation changing rapidly. This paper investigates in the detail concept of Maximum PowerPoint Tracking (MPPT) which significantly increases the efficiency of the solar photovoltaic system.

Keywords

Boost Converter, Grid Connected Photovoltaic (PV) System, Voltage Source Inverter, Maximum Power Point Tracking (MPPT), Pwm Generator.

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Chandrasekhar B. ¹, Sanjay Lakshminarayanan ², Sudhir Kumar R. ¹

Affiliations
1 Energy Efficiency and Renewable Enenrgy Division, Central Power Research Institute, Bengaluru - 560080, IN
2 Associate Professor, EEE, MS Ramaiah Institute of Technology, Bengaluru - 560054, IN

Abstract

Single input DC-DC converters can be successfully replaced by a single, multiple input DC-DC converter. The structure of Multiple-Input Converter (MIC) is simpler compared to the use of several single input converters for each source. Using input renewable energy sources like photovoltaic (PV) source, wind source and fuel cell, etc, MIC can deliver power either simultaneously from all of the input sources to the load or individually. MICs reduce the system size and cost by reducing the number of components. This paper presents integrated Buck, Boost, Buck-Boost multi input DC-DC converters circuit configurations, theoretical aspects, their operational principles, merits and demerits.

Keywords

Multi Input DC-DC Converter (MIC), Integrated Buck, Boost, Buck-boost Converters.

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