EP1246335A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Power factor control apparatus and method

Assignee: Mitsubishi Electric Corp

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Filing: 2002-03-26

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Granted: —

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Expires: 2022-03-26

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Abstract

Abstract A power factor control apparatus comprises a target power factor setting section (9a) which sets a target power factor range of the plurality of power generators (1a, 1b, 1c, 1d) in a fixed cycle, a comparing section (9a) which compares a voltage of a bus (10) with a predetermined voltage value range, a first control section (9a) which performs control, based on a result of the comparing section, to drop a voltage of at least one power generator (1a, 1b, 1c, 1d) whose power factor is the lowest, when the voltage of the bus (10) is higher than the predetermined voltage value range, and raise a voltage of at least one power generator (1a, 1b, 1c, 1d) whose power factor is the highest, when the voltage of the bus (10) is lower than the predetermined voltage value range, and a second control section (9a) which performs control of a voltage of a power generator (1a, 1b, 1c, 1d), whose power factor is out of the target power factor range, such that the power factor thereof falls within the target power factor range, when the voltage of the bus (10) falls within the predetermined voltage value range as a result of the comprising section (9a).

Inventors

👤 Daisuke Sumiya
👤 Shinichi Koyanagi
👤 Hirofumi Araki

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-11-05 07:22

CPC Classifications

H; H02; H02J; H02J3/00; H02J3/18; H02J3/1885; H02J3/38; H02J3/46; H02J3/50; H02J2105/00; H02J2105/10; H02J2105/12; Y; Y02; Y02E; Y02E40/00; Y02E40/30; Y02P; Y02P80/00; Y02P80/10; Y02P80/14; Y02P80/15

Claims Analysis

Total Claims: 2

Claim 1

Independent Claim 229 words

A power factor control apparatus which controls power factors of a plurality of power generators (1a, 1b 1c, 1d) connected to a bus (10), characterized by comprising: a target power factor setting section (9a) which sets a target power factor range of the plurality of power generators (1a, 1b 1c, 1d) in a fixed cycle; a comparing section (9a) which compares a voltage of the bus (10) with a predetermined voltage value range in the fixed cycle; a first control section (9a) which performs control, based on a result of the comparing section, to drop a voltage of at least one power generator (1a, 1b 1c, 1d) whose power factor is the lowest, when the voltage of the bus (10) is higher than the predetermined voltage value range, and raise a voltage of at least one power generator (1a, 1b 1c, 1d) whose power factor is the highest, when the voltage of the bus (10) is lower than the predetermined voltage value range; and a second control section (9a) which performs control of a voltage of a power generator (1a, 1b, 1c, 1d), whose power factor is out of the target power factor range, such that the power factor thereof falls within the target power factor range, when the voltage of the bus (10) falls within the predetermined voltage value range as a result of the comparing section (9a).

Claim 2

Dependent Claim 215 words

A power factor control method which controls power factors of a plurality of power generators (1a, 1b, 1c, 1d) connected to a bus (10), characterized by comprising: a step of setting a target power factor range of the plurality of power generators (1a, 1b 1c, 1d) in a fixed cycle; a step of comparing a voltage of the bus (10) with a predetermined voltage value range in the fixed cycle; a step of performing control, based on a result of the comparing step, to drop a voltage of at least one power generator (1a, 1b, 1c, 1d) whose power factor is the lowest, when the voltage of the bus (10) is higher than the predetermined voltage value range, and raise a voltage of at least one power generator (1a, 1b 1c, 1d) whose power factor is the highest, when the voltage of the bus (10) is lower than the predetermined voltage value range; and a step of performing control of a voltage of a power generator (1a, 1b, 1c, 1d), whose power factor is out of the target power factor range, such that the power factor thereof falls within the target power factor range, when the voltage of the bus (10) falls within the predetermined voltage value range as a result of the comparing step.

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