By Timothy U Townsend
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Additional info for A method for estimating the long-term performance of direct-coupled photovoltaic systems
For the ideal cell, the two 25 unknown parameters are IL and IO. The functional relationships for IL (Eqn. 2) and IO (Eqn. 4) with respect to changes in irradiance and cell temperature apply to all subsequent equivalent circuits, except for the MIT model. Additional simplifying assumptions are used in the MIT model as well as different algebraic groupings of the various parameters and constant terms. Consequently, different relationships are employed to track variations in the I-V characteristic with changes in irradiance and temperature.
Economic analyses) which are commonly included among the available models. The emphasis of this work is on energy calculations and, in the case of water pumping applications, volume of water pumped. Economics calculations can easily be done once performance information is known. 12 Table 1. S. ) collectors. p. or con. ; MPT systems only; incl. p. PVPM (PV Per- Electric Power Detailed; MPT systems only; no storage or formance Model) Research Inst. p. or con. E&R (Engr. & Jet Prop. p. LCP (Lifetime Jet Prop.
Determine operating point and integrate results: The hourly irradiance and temperature data established above is used to fix the array I-V characteristics. The load expressions for voltage are substituted into an array I-V equation and then an iterative solution technique is employed to solve for the operating point. The maximum power point output is also calculated for 16 each hour. The ratio of the actual direct-coupled output to the maximum power output provides an indication of how effective the matching is between the array and load.