Title:
DISTRIBUTED ELECTRIC POWER SOURCE ELECTRIC POWER DISTRIBUTION SYSTEM AND METHOD FOR CONTROLLING DISTRIBUTED ELECTRIC POWER SOURCE ELECTRIC POWER DISTRIBUTION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2024/024214
Kind Code:
A1
Abstract:
Provided is a distributed electric power source electric power distribution system that cooperates with an anti-islanding device and is able to suppress over-voltages that occur when a ground fault has occurred multiple times during a reverse electric power flow from a distributed electric power source. In the present invention, a distributed electric power source electric power distribution system 100 comprises: an electric power distribution grid 200 that supplies electric power to electric power-demanding units 10a–10c via automatic switches 9a–9h; and a distributed electric power source site 21 that has an electric power source 7b, an anti-islanding device 18, a parallel-off breaker 8b that is connected to a high-voltage electric power distribution line 5 and is opened and closed on the basis of an output signal from the anti-islanding device 18, a switch 17a for controlling the anti-islanding device 18, a second transformer 3b for a grounded measuring instrument, and a high-resistance grounding switch 17b, the distributed electric power source site 21 being connected to the electric power distribution grid 200 via the high-voltage electric power distribution line 5 and supplying electric power to a load 22. When, at the time of a ground fault accident, a reverse electric power flow to the electric power distribution grid 200 that originates from the electric power source 7b of the distributed electric power source site 21 is caused, a neutral point of the distributed electric power source site 21 is grounded via the high-resistance grounding switch 17b, using the second transformer 3b for a grounded measuring instrument temporarily.
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Inventors:
SATO TAKASHI (JP)
TOMOBE OSAMU (JP)
YAMAMOTO MASASHI (JP)
TOMOBE OSAMU (JP)
YAMAMOTO MASASHI (JP)
Application Number:
PCT/JP2023/017998
Publication Date:
February 01, 2024
Filing Date:
May 12, 2023
Export Citation:
Assignee:
HITACHI LTD (JP)
International Classes:
H02J3/38; H02H3/20; H02H7/26
Foreign References:
| JP2009148098A | 2009-07-02 | |||
| JP2014082851A | 2014-05-08 | |||
| JP2011155795A | 2011-08-11 |
Attorney, Agent or Firm:
KAICHI IP (JP)
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