Power line linking apparatus for linking a power generator to a commercial power line

• US 5,548,504 A
• Filed: 10/04/1993
• Issued: 08/20/1996
• Est. Priority Date: 10/19/1992
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Takehara, Nobuyoshi
• Primary Examiner(s): Sterrett, Jeffrey L.
• Application Number:
  US08/130,919
• Time in Patent Office: 1,051 Days
• Field of Search: 363/34, 363/37, 363/65, 363/71, 363/95, 363/131
• US Class Current: 363/65
• CPC Class Codes: H02M 7/49 Combination of the output voltage waveforms of a plurality of converters

Abstract

A line linking inverter achieves load balance and protection for loss of one phase in linking with a single-phase three-wire distribution. Input terminals for connection with a solar cell array or the like (1) are connected in parallel to a pair of power conversion units (21, 22), and output terminals of the pair of power conversion units (21, 22) are connected in series. The pair of power conversion uniys (21, 22) are simultaneously controlled by a controller (3).

Claims

1. A line linking apparatus comprising:

a DC power generator for generating power by solar cells;

a pair of DC/AC converters connected in parallel to output terminals of said DC power generator; and

a wiring for interconnecting output terminals of said pair of DC/AC converters and terminals of a commercial power line in a single-phase, three-wire mode.

2. A line linking apparatus comprising:

a DC power generator for generating power by solar cells;

a pair of DC/AC converters connected in parallel to output terminals of said DC power generator;

a pair of transformers connected in series, respectively, to output terminals of said pair of DC/AC converters; and

a wiring for interconnecting terminals of said pair of transformers and terminals of a commercial power line in a single-phase, three-wire mode.

3. A line linking apparatus comprising:

a DC power generator for generating power by solar cells;

a pair of DC/AC converters connected in parallel to output terminals of said DC power generator;

control means for detecting an over-voltage for each of said pair of DC/AC converters independently based on an AC output voltage value and a DC input voltage value and controlling go that operation of said converters is stopped in the event of an overvoltage;

a pair of transformers connected in series respectively to output terminals of said pair of DC/AC converters; and

a wiring for interconnecting terminals of said pair of transformers and terminals of a commercial power line in a single-phase, three-wire mode.

4. A line linking apparatus comprising:

a DC power generator for generating power by solar cells;

a pair of DC/AC converters connected in parallel to output terminals of said DC power generator;

a pair of high-frequency filters connected in series, respectively, to said pair of DC/AC converters; and

a wiring for interconnecting terminals of said pair of high-frequency filters and terminals of a commercial power line in a single-phase, three-wire mode.

5. A line linking apparatus comprising:

a DC power generator for generating power by solar cells;

a pair of DC/AC converters connected in parallel to output terminals of said DC power generator;

a pair of transformers connected in series, respectively, to output terminals of said pair of DC/AC converters;

a pair of high-frequency filters connected in series respectively to said pair of transformers; and

a wiring for interconnecting terminals of said pair of high-frequency filters and terminals of a commercial power line in a single-phase, three-wire mode.

6. A line linking apparatus comprising:

a DC power generator for generating power by solar cells;

a pair of DC/AC converters connected in parallel to output terminals of said DC power generator;

control means for detecting an over-voltage for each of said pair of DC/AC converters independently based on an AC output voltage value and a DC input voltage value and controlling so that operation of said converters is stopped in the event of an overvoltage;

a pair of transformers connected in series, respectively, to output terminals of said pair of DC/AC converters;

a pair of high-frequency filters connected in series respectively to said pair of transformers; and

a wiring for interconnecting terminals of said pair of high-frequency filters and terminals of a commercial power line in a single-phase, three-wire mode.

7. A line linking apparatus comprising:

a DC power generator for generating power by solar cells;

a pair of DC/AC converters connected in parallel to output terminals of said DC power generator;

control means for detecting an over-current for each of said pair of DC/AC converters independently base don an AC output current value and a DC input current value and controlling so that operation of said converters is stopped in the event of an overcurrent;

a pair of transformers connected in series, respectively, to output terminals of said pair of DC/AC converters; and

a wiring for interconnecting terminals of said pair of transformers and terminals of a commercial power line in a single-phase, three-wire mode.

8. A line linking apparatus comprising:

an AC power generator for generating power by a wind power generator;

a pair of AC/AC converters connected in parallel to output terminals of said AC power generator; and

a wiring for interconnecting output terminals of said pair of AC/AC converters and terminals of a commercial power line in a single-phase, three-wire mode.

9. A line linking apparatus comprising:

an AC power generator for generating power by a wind power generator;

a pair of AC/AC converters connected in parallel to output terminals of said AC power generator;

a pair of transformers connected in series, respectively, to output terminals of said pair of AC/AC converters; and

a wiring for interconnecting output terminals of said pair of transformers and terminals of a commercial power line in a single-phase, three-wire mode.

10. A line linking apparatus comprising:

an AC power generator for generating power by a wind power generator;

a pair of AC/AC converters connected in parallel to output terminals of said AC power generator;

control means for detecting an overvoltage for each of said pair of AC/AC converters independently based on an AC output voltage value and an AC input voltage value and controlling so that operation of said converters is stopped in the event of an overvoltage;

a pair of transformers connected in series respectively to output terminals of said pair of AC/AC converters; and

a wiring for interconnecting output terminals of said pair of transformers and terminals of a commercial power line in a single-phase, three-wire mode.