Process and system for producing photovoltaic power
First Claim
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1. Process for obtaining the maximum power from an assembly of photovoltaic cells, comprising the steps of:
- (a) converting the D.C. power furnished by said assembly into an A.C. power P by means of a converter controlled by a modulated signal having a rate of modulation τ
, the power actually furnished by said converter at an instant t1 being P1, and the corresponding rate of modulation being τ
1 ;
(b) at an instant t2 >
t1, varying the rate of modulation τ
1 by causing it to take the 2n values τ
1 +Δ
τ
, τ
1 +2Δ
τ
, . . . , τ
1 +nΔ
τ
, and τ
1 -Δ
τ
, τ
1 -2Δ
τ
, . . . , τ
1 -nΔ
τ
;
(c) determining for each of said 2n values of the rate of modulation, the power actually furnished by said converter;
(d) choosing from among said 2n values of P and said initial value P1, the highest value PM ;
(e) noting the value τ
M of the rate of modulation corresponding to said highest value PM ;
(f) imposing said modulation rate τ
M on the control signal of said converter during a time slot Δ
t; and
(g) at the instant t2 +Δ
t, repeating steps b, c, d, e, and f.
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Abstract
The invention relates to a process and system for obtaining the maximum power from an assembly of photovoltaic cells. According to the invention, the D.C. power furnished by said assembly is converted, with the aid of a converter controlled by a modulated signal, into an A.C. power, and the value of the rate of modulation corresponding constantly to the maximum power, is determined for example with the aid of a microprocessor. The invention is applicable to the generation of solar energy with coupling on the network of a converter.
92 Citations
10 Claims
-
1. Process for obtaining the maximum power from an assembly of photovoltaic cells, comprising the steps of:
-
(a) converting the D.C. power furnished by said assembly into an A.C. power P by means of a converter controlled by a modulated signal having a rate of modulation τ
, the power actually furnished by said converter at an instant t1 being P1, and the corresponding rate of modulation being τ
1 ;(b) at an instant t2 >
t1, varying the rate of modulation τ
1 by causing it to take the 2n values τ
1 +Δ
τ
, τ
1 +2Δ
τ
, . . . , τ
1 +nΔ
τ
, and τ
1 -Δ
τ
, τ
1 -2Δ
τ
, . . . , τ
1 -nΔ
τ
;(c) determining for each of said 2n values of the rate of modulation, the power actually furnished by said converter; (d) choosing from among said 2n values of P and said initial value P1, the highest value PM ; (e) noting the value τ
M of the rate of modulation corresponding to said highest value PM ;(f) imposing said modulation rate τ
M on the control signal of said converter during a time slot Δ
t; and(g) at the instant t2 +Δ
t, repeating steps b, c, d, e, and f. - View Dependent Claims (2, 3, 4, 5)
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6. A system for producing photovoltaic power comprising an assembly of photovoltaic cells and a D.C.-A.C. converter transforming the D.C. power produced by said assembly into A.C. power, wherein said converter is controlled by a control signal which determines the rate of conversion of the D.C. power into A.C. power, and said system further comprises
a modulator delivering at its output a modulated signal acting as control signal for said converter and of which the rate of modulation regulates said rate of conversion, a processor for determining by iteration the modulation rate which results in maximum power available at the output of said converter and means for imposing said modulation rate on said modulated signal.
Specification