Investigating Effects of Shading on Performance of Solar Conversion Devices
The amount of electrical energy generation from solar photovoltaic (SPV) module depends on the range of incoming solar radiation. Generated current (as well as output power) is proportional to the amount of solar irradiance received by module. SPV module
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Abstract The amount of electrical energy generation from solar photovoltaic (SPV) module depends on the range of incoming solar radiation. Generated current (as well as output power) is proportional to the amount of solar irradiance received by module. SPV module typically consists of 36 or 72 solar cells of specific area interconnected in series or parallel network to achieve required power output and in order to generate rated power, all cells should be exposed to same irradiance. In this paper, partial shading assessment on 40 W module connected in distributed network is carried out. Individual module is connected with solar parameter data logger to measure accurate instantaneous data. The data logger is based on INC MPPT method. Cell level modeling is carried out to understand the effect on module output power when individual solar cells are exposed to different irradiance levels. Experimental results show that short circuit current reduces by nearly 60% when even single solar cell in module gets partially shaded.
Keywords Solar radiation Maximum power point tracking Partial shading Solar photovoltaic conversion
Measurement
K.J. Shruthi (&) A. Amruthakala ID, CPRI, Bengaluru, India e-mail: [email protected] A. Amruthakala e-mail: [email protected] P. Giridhar Kini Department of EEE, MIT, Udupi, India e-mail: [email protected] C. Viswanatha DCCD, CPRI, Bengaluru, India e-mail: [email protected] M. Divekar R & D, CPRI, Bengaluru, India e-mail: [email protected] © Springer Nature Singapore Pte Ltd. 2018 S. SenGupta et al. (eds.), Advances in Smart Grid and Renewable Energy, Lecture Notes in Electrical Engineering 435, https://doi.org/10.1007/978-981-10-4286-7_60
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1 Introduction Current technological advances have capacitated solar energy generation as attractive alternative renewable energy generation. On geographical plane, India is located from latitude of 8° 4′ to 37° 6′N and longitude of 68° 7′ to 97° 25′E exposing it to abundant solar radiation throughout the year. By receiving 300 days of sunshine makes India idea for solar electrical power generation [1]. The generated electrical energy is currently used to meet the energy demands for different purposes such as agricultural, lighting, drinking, and cooking. The Jawaharlal Nehru National Solar Mission was launched by MNRE, a Government of India organization with a target of 20,000 MW solar-grid-connected energy generation by the year 2022. The current solar-grid-connected energy generation (by July 2016) is 8000 MW with 238 MW generation in Karnataka state. There are several technical issues related to grid connected solar energy generation which require critical consideration before design [2]. Different types of SPV cells have been developed which have varying performances and efficiencies. A monocrystalline silicon solar cell has conversion efficiency of 12–18%, while a polycrystalline silicon solar cell has 8–12% [3]. These conversion efficiencies stated by the manufacturers are measured under
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