PHOTOVOLTAIC POWER SYSTEM

• US 20110011439A1
• Filed: 02/23/2009
• Published: 01/20/2011
• Est. Priority Date: 02/25/2008
• Status: Abandoned Application

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Hasegawa, Masatomo, Shimizu, Akira
• Application Number:
  US12/919,151
• Publication Number:
  US 20110011439A1
• Time in Patent Office: Days
• US Class Current: 136/244
• CPC Class Codes: H01L 31/0201 comprising specially adapted module bus-bar structures
• CPC Class Codes: H02J 2300/24 of photovoltaic origin
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers

Abstract

A system of high efficiency and low cost is provided as a photovoltaic power system comprising a solar cell connected to a power converter.

A photovoltaic power system comprising a plurality of solar cell modules connected in parallel to a power converter, the solar cell modules outputting a voltage higher than an output voltage of the power converter.

Claims

1. A photovoltaic power system comprising:

a plurality of solar cell modules connected in parallel to a power converter, the solar cell modules outputting a voltage higher than an output voltage of the power converter.

2. The photovoltaic power system according to claim 1, wherein the output voltages of the solar cell modules are √

{square root over ( )} 2 to 10 times the output voltage of the power converter.

3. The photovoltaic power system according to claim 1, wherein all the solar cell modules are connected in parallel.

4. The photovoltaic power system according to claim 1, linking with an AC commercial power system.

5. The photovoltaic power system according to claim 1, wherein the solar cell modules are thin-film solar cell modules comprising a thin-film solar cell string comprising a plurality of thin-film solar cell elements interconnected in series, each of the thin-film solar cell elements including a surface electrode, a photoelectric conversion layer, and a back surface electrode laminated in this order.

6. The photovoltaic power system according to claim 1, wherein the thin-film solar cell modules each have a protective member inserted in a connection line for connection line connecting the thin-film solar cell modules to the power converter in parallel.

7. The photovoltaic power system according to claim 6, wherein the protective member is a blocking diode or a fuse.

8. The photovoltaic power system according to claim 1, wherein the thin-film solar cell modules each have a resistance connected in a connection line for connection line connecting the plurality of thin-film solar cell modules in parallel.

9. The photovoltaic power system according to claim 8, wherein the closer the resistance is to the power converter, the smaller a value of the resistance is.

10. The photovoltaic power system according to claim 8, wherein the resistance is formed of the connection line connecting the plurality of solar cell modules to the power converter in parallel.

11. The photovoltaic power system according to claim 1, wherein the closer the plurality of solar cell modules are to the power converter, the lower the output voltage thereof is.

12. The photovoltaic power system according to claim 5, wherein the thin-film solar cell string has a number of series connection stages of the thin-film solar cell elements that satisfies a following formula (1):

n<

Rshm/2.5/Vpm×

Ipm+1 

 

(1),

wherein Rshm is a most frequent short-circuit resistance value of the thin-film solar cell elements;

Vpm is an optimum operation voltage of the thin-film solar cell elements; and

Ipm is an optimum operation current of the thin-film solar cell elements.

13. The photovoltaic power system according to claim 12, wherein the optimum operation voltage of the thin-film solar cell string is more than 160 V.