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Photovoltaic modules

Photovoltaic modules. Session 6. Photovoltaic modules. Session 6.

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Photovoltaic modules

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  1. Photovoltaic modules Session 6 JP TEASEL 01/02/11

  2. Photovoltaic modules Session 6 PV cells can be arranged in a series configuration to form a module, and modules can then be connected in parallel-series configurations to form arrays.  When connecting cells or modules in series, they must have the same current rating to produce an additive voltage output, and similarly, modules must have the same voltage rating when connected in parallel to produce larger currents. JP TEASEL 01/02/11

  3. Photovoltaic modules Session 6 Theory of I-V Characterization PV cells can be modeled as a current source in parallel with a diode.  When there is no light present to generate any current, the PV cell behaves like a diode.  As the intensity of incident light increases, current is generated by the PV cell, as illustrated in Figure 1 JP TEASEL 01/02/11

  4. Photovoltaic modules Session 6 I-V Curves for Modules For a module or array of PV cells, the shape of the I-V curve does not change. However, it is scaled based on the number of cells connected in series and in parallel.  When n is the number of cells connected in series and m is the number of cells connected in parallel and ISC and VOC are values for individual cells, the I-V curve shown in Figure 10 is produced. JP TEASEL 01/02/11

  5. Photovoltaic modules Session 6 Understanding cell connection Current (A) • The PV module is the basic unit in a complete PV system • Understanding how the module is designed and assembled provides key understanding to designing a system • Towards this end consider the following IV characteristics of a single cell 4 Voltage (V) 0.6 JP TEASEL 01/02/11

  6. Photovoltaic modules Session 6 Current (A) • With three cells connected in series the combined characteristics are shown • Connecting the cells in series maintains the same current, only the voltage of each cell is added together 4 Voltage (V) 0.6 1.2 1.8 The combined IV characteristics of three identical cells connected in series JP TEASEL 01/02/11

  7. Photovoltaic modules Session 6 Current (A) Current (A) C • If two cells with different characteristics (dissilimar) are wired together in series, the result is shown in following figures • Series connected dissimilar cells produce an added voltage output, but series current is equal to the lowest value of the two Voltage (V) A B Voltage (V) A B The individual IV characteristics of two dissimilar cells Current (A) C D Voltage (V) A+B The combined IV characteristics of the two dissimilar cells connected in series JP TEASEL 01/02/11

  8. Photovoltaic modules Session 6 JP TEASEL 01/02/11

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