US 9,866,017 B2Granted

DC power generation system and protection method for DC power generation system

AssigneeMitsubishi Electric Corporation

InventorsMakoto Kanemaru, Takeshi Shindoi, Tomotaka Yano

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Abstract

A DC power generation system in which an arc detector, comprising an arc noise analysis unit which detects an arc which occurs in a DC power generation system based on noise of signal of a voltage-current sensor, a voltage-current variation analysis unit for specifying an arc occurrence point in a case where an arc is detected in the arc noise analysis unit, a voltage-current operation point of output of each string is analyzed based on a signal from a voltage-current sensor and based on variation of voltage-current operation point before and after when an arc is detected and a switch control unit for controlling of opening or closing of a switch based on an arc specified result in a voltage-current variation analysis unit, is provided.

Claims13

Dependent claims

A DC power generation system in which a plurality of strings, comprising a plurality of DC power generation modules, are connected in series and are connected to a DC bus in parallel, and power is supplied to the DC bus,

wherein each string has a voltage-current sensor which detects an output voltage and an output current of the string and a switch which intercepts connecting to the DC bus of the string at an output side;
and has an arc detector comprising;
an arc noise analysis unit which detects an arc which occurs in the DC power generation system based on noise of a signal of the voltage-current sensor,
a voltage-current variation analysis unit in which, in a case where an arc is detected in the arc noise analysis unit, a voltage-current operation point of output of each string is analyzed based on a signal from the voltage-current sensor, and an occurrence point of the arc is specified based on variation of the voltage-current operation point before and after when the arc is detected, and
a switch control unit which controls to open or close the switch based on an arc specified result in the voltage-current variation analysis unit.

2 more elements

A protection method for a DC power generation system which comprises a plurality of strings and each of the strings comprises a plurality of DC power generation modules connected in series, the each string is connected to a DC bus in parallel via a switch, and power is supplied to the DC bus,

the protection method comprising;
an arc detection step for detecting an arc which occurs in the DC power generation system based on noise which occurs in the string,
an arc occurrence point specifying step for specifying an arc occurrence point in a case where the arc is detected, a voltage-current operation point of output of each string of the plurality of strings are analyzed and based on variation of the voltage-current operation point before and after when the arc is detected, and
a switch control step for controlling of opening or closing the switch based on specified result of the arc occurrence point.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 14/911,238Filed 17 Jan 2014
Priority: JP 2013-17410526 Aug 2013
Published: US 2016/0181799 A123 Jun 2016
Granted: 9 Jan 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

H02H 1/0015
Concerning the detecting means: using arc detectors
H02H 3/38
Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working…:…
H02H 7/20
Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection…:…
H02M 7/44
Conversion of DC power input into AC power output without possibility of reversal: by static converters