Pre-Grant Publication Number: 20100286838
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Prior Art Detail
Summary / Description
| Summary / Description | Islanding detection methods for distributed resources are reviewed. Special emphasis is put on some of the detecting systems based on “active methods” which have been developed in Japan for rotating machine type distributed generations. Then, reduction of the islanding detection sensitivity with multiple distributed generations is discussed. Finally, a new concept of an islanded operation is introduced. |
Basic Information
| Type of Prior Art | Print Publication |
| Publication Title * | IEEE Bologna Power Tech Conf |
| Author | T.Funabashi, and K.Koyanagi, and R.Yokoyama, |
| ISBN | |
| Page Range | |
| Medium | Journal article |
| Publication Date * | 2003 |
| URL | |
Notes / To Do
| Notes | |
Excerpt
Excerpt As one of the measures to be taken for the detection of
islanded operation, variations in the voltage and frequency are
detected at the time of modal transition to islanded operation.
When a variation signal is sensed, the circuit breaker at the
interconnecting point is tripped. This is a well-known practice
done by the voltage/frequency relays. These relays are used to
detect the occurrence of islanded operation by monitoring a
change in the system's frequency or voltage. If there is any
change in the generator load at the time of separation from the
system, the frequency and voltage of the generator are
changed to produce a new energy balance.
The ROCOF relay [2],[4] is generally accepted as the
standard method for islanding protection of the distributed
system. These relays monitor the voltage waveform, and
operate when the rate-of-change of frequency exceeds a
setting and duration exceeds a time delay setting. COROCOF
relay [16] is the new type. In principles, it compares the rateof-change of frequency at the generator with that of the rest of
the system |
Relevance
Claims
1
Relevance
This paper reviews islanding detection methods, specifically mentioning detecting variations in frequency and using a rate-of-change of frequency as known detection methods.
This paper reviews islanding detection methods, specifically mentioning detecting variations in frequency and using a rate-of-change of frequency as known detection methods.
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2
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Same as above.
Same as above.
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28
Relevance
This paper reviews islanding detection methods, specifically mentioning detecting variations in frequency and using a rate-of-change of frequency as known detection methods.
This paper reviews islanding detection methods, specifically mentioning detecting variations in frequency and using a rate-of-change of frequency as known detection methods.
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