Maximum power control for a solar array connected to a load

Electrical transmission or interconnection systems – Plural supply circuits or sources – One source floats across or compensates for other source

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320 32, 323906, 363 80, H02J 338

Patent

active

044044720

ABSTRACT:
An analog and a digital control is provided which causes a dc to ac inverter operated in the constant power mode to supply sinusoidal current to a utility while drawing maximum power from a solar array. The current drawn from the array is forced to be proportional to the array voltage by a variable gain amplifier so that the inverter presents a resistive load to the array which remains statically stable under rapid changes of insolation while using a perturb-and-observe method of maximum power tracking. The perturb-and-observe method adjusts the gain of the variable gain amplifier to achieve maximum power output from the solar array.

REFERENCES:
patent: 3384806 (1968-05-01), Hartman
patent: 3626198 (1971-12-01), Boehringer
patent: 4059772 (1977-11-01), Wilkerson
"An Inverter/Controller Subsystem Optomized for Photovoltaic Applications," Conf: 13th IEEE Photovoltaic Specialists Conf., 1978, pp. 984-991, Wash. D.C., USA (Jun. 5-8, 1978).
"The Design of a Photovoltaic System for a Southwest All-Electric Residence", Feb. 1980, Sandia National Lab., Sand 79-7056, pp. 5-26/5-28.

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