Power conversion apparatus, power conversion system, and islanding operation detection method
AssigneeCanon Kabushiki Kaisha
InventorsMasaki Suzui, Nobuyoshi Takehara
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Abstract
When islanding operation is to be detected in a power conversion apparatus for converting a DC power into an AC power and outputting the AC power to a system power supply, a plurality of variation generation systems for executing, in accordance with different schemes, detection of islanding operation in which power supply from the system power supply is stopped are arranged, and at least one variation generation systems is selected by selection system from the plurality of variation generation systems and operated.
Claims28
A power conversion apparatus for converting a DC power into an AC power and outputting the AC power to a system power supply, characterized by comprising:
- islanding operation detection means having a plurality of different schemes which detect an islanding operation state in which power supply from the system power supply is stopped;
- and
- selection means for selecting at least one scheme to be operated from the plurality of schemes.
An islanding operation detection method for a power conversion apparatus for converting a DC power into an AC power and outputting the AC power to a system power supply, characterized by comprising:
- arranging islanding operation detection means having a plurality of different schemes which detect an islanding operation state in which power supply from the system power supply is stopped;
- and
- selecting at least one scheme from the plurality of schemes and operating the scheme.
An islanding operation detection method for a power conversion system comprising a plurality of sets of power conversion apparatuses for converting a DC power into an AC power and outputting the AC power to a system power supply and DC power supplies which are arranged in correspondence with the power conversion apparatuses and supply the DC power, characterized by comprising
- arranging, in each power conversion apparatus, islanding operation detection means having a plurality of different schemes which detect an islanding operation state in which power supply from the system power supply is stopped;
- and
- selecting the schemes in each power conversion apparatus so as to select schemes in substantially equal number, which are to be operated in the system.
Dependencies are inferred from the claim text.