VOLTAGE STABILITY-MONITORING DEVICE AND METHOD

Title:

VOLTAGE STABILITY-MONITORING DEVICE AND METHOD

Document Type and Number:

WIPO Patent Application WO/2015/163121

Kind Code:

A1

Abstract:

The objective of the present invention is to accurately monitor the deterioration of present or future voltage stability by causing a bus line over which present or future voltage stability deterioration occurs to be dynamically modified in a calculation for monitoring the stability of an electrical grid. Thus, the present invention is a voltage stability-monitoring device for monitoring the voltage stability of an electrical grid, wherein: a plurality of imagined change scenarios representing scenarios of change that are imagined are created on the basis of the change in power flow status and/or the grid configuration of the electrical grid; the voltage stability is calculated using the imagined change scenarios; a voltage stability allowance representing the degree of allowance for the voltage stability is calculated on the basis of the voltage stability; imagined change scenarios that have a high-severity level of voltage stability for their individual imagined change scenarios are selected on the basis of the voltage stability allowance; and a calculation is made, on the basis of the selected imagined change scenario, as to whether any bus lines of the electrical grid are vulnerable bus lines that will precipitate a decline in voltage stability, whereby monitoring targets for voltage stability are modified on the basis of information on the vulnerable bus lines.

Inventors:

KURODA EISUKE (JP)
SATO YASUO (JP)
TOMOBE OSAMU (JP)
YAMAZAKI JUN (JP)
YATSU MASAHIRO (JP)
HARA KOUICHI (JP)
MIYOSHI HARUKI (JP)

Application Number:

PCT/JP2015/060690

Publication Date:

October 29, 2015

Filing Date:

April 06, 2015

Export Citation:

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Assignee:

HITACHI LTD (JP)

International Classes:

H02J3/00; H02J3/24

Foreign References:

JP2001025168A	2001-01-26
JP2011115024A	2011-06-09
JPH0946935A	1997-02-14

Other References: