Title:
REACTIVE POWER COMPENSATOR FOR PROTECTING SYSTEM INTERCONNECTION
Document Type and Number:
Japanese Patent JP3302875
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To make it possible to surely defect an islanding state without selecting a variation frequency for the reactive power unit or using an expensive transmission breaking device and realize reliable protective function without a decrease in detective sensitivity caused by mutual interference of a reactive power unit.
SOLUTION: When an islanding state takes place, a change in frequency at linkage points is detected by control units 45 to 49, and a reactive power reference value is adjusted under control in such a way as to increase the frequency change. A reactive power compensating unit 40 generates reactive power to cause a hunting state, in which frequency at the linkage point fluctuates in a given frequency cycle near to a rated frequency. Under these conditions, protective operation can be carried out by opening breakers 6 and 63 between the linkage point and a non-utility generator.
Inventors:
Chihiro Okatsuchi
Application Number:
JP5430096A
Publication Date:
July 15, 2002
Filing Date:
March 12, 1996
Export Citation:
Assignee:
Toshiba IT Control Systems Co., Ltd.
Toshiba Corporation
Toshiba Corporation
International Classes:
H02H7/06; H02J3/18; H02J3/38; H02J3/50; (IPC1-7): H02J3/38
Domestic Patent References:
| JP731197A | ||||
| JP7123595A | ||||
| JP3256533A |
Attorney, Agent or Firm:
Hideaki Togawa