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1. 发明专利

JPH11341892A DEVELOPMENT OF REGULAR MAINTENANCE SCHEME FOR GENERATOR 失效
公开(公告)号：JPH11341892A
公开(公告)日：1999-12-10
申请号：JP14117398
申请日：1998-05-22
申请人： FUJI ELECTRIC CO LTD
发明人： KOIKE TOMOHIRO , TAKENAKA MICHIO
IPC分类号： H02P9/00 , G06Q10/00 , G06Q10/06 , G06Q10/10 , G06Q50/00 , G06Q50/06 , G06Q50/10 , G06F17/60
摘要： PROBLEM TO BE SOLVED: To develop, in a short time, a regular maintenance scheme for a generator over a plurality of years, evaluate the different objective such as the reliability and the economics of a system with the will of an operator incorporated, and change or evaluate the developed scheme with flexibility. SOLUTION: In this method, a regular maintenance schedule 2 for a generator is developed to determine the maintenance period of the generator which is under the jurisdiction of a load-dispatch instruction corner, a system controlling corner or the like in a system by a computer system, so that the evaluation function of the reliability and economics of a system may be optimized under various restrictive conditions on system operation under the rated power of the generator, the required repair period, and estimated demand during examination as input information. Among the evaluation functions of the reliability and economics of the system, with the one of the highest priority as a primary objective and others as secondary objective (S11), the evaluation function of the secondary objective is integrated as a restricting condition (S12), and the evaluation function of the primary objective is optimized (S13) so as to develop a regular maintenance schedule.

2. 发明专利

JPH11262170A ELECTRIC POWER SYSTEM ACCIDENT ZONE DETERMINATION 失效
公开(公告)号：JPH11262170A
公开(公告)日：1999-09-24
申请号：JP6277298
申请日：1998-03-13
申请人： FUJI ELECTRIC CO LTD
发明人： KOIKE TOMOHIRO , MATSUI TETSUO
IPC分类号： H02H7/26 , H02J3/00 , H02J13/00
摘要： PROBLEM TO BE SOLVED: To increase precision of accident zone determination, by setting a main protective flag for indicating presence of a main protective relay and a back-up protective flag for indicating presence of a back-up protective relay for determining the relays by these information in verifying relay operation. SOLUTION: An inflow channel of accident current into an accident potential zone is extracted (S12). A difference in the protective range of a set relay and the set time of an accident elimination relay are compared per channel for verifying relay operation, thus verifying the operation of a mounted relay (S15). If the relay does not operate at the terminal in the accident potential zone, and a short circuit relay (S) or a ground fault relay (G) on which a main protective flag is set by the terminal exists, the (S) relay or (G) relay is judged as a malfunction or non-operation (S17). If the (S) relay or (G) relay which protects the accident potential zone in the direction of a transmission line exists, and a back-up protective flag is set, the (S) relay or (G) relay is judged as the malfunction or non-operation (S18). It is thus possible to eliminate accident potential zones involving two or more the invalid operational relays to determine the accident potential zone (S19).

3. 发明专利

JPH1185845A REGULAR REPAIR PLANNING SET METHOD FOR POWER GENERATOR 失效
公开(公告)号：JPH1185845A
公开(公告)日：1999-03-30
申请号：JP24251297
申请日：1997-09-08
申请人： FUJI ELECTRIC CO LTD
发明人： KOIKE TOMOHIRO , TAKENAKA MICHIO , UEKI YOSHITERU
IPC分类号： G06Q50/10 , G06Q50/00 , G06Q50/06 , G06F17/60
摘要： PROBLEM TO BE SOLVED: To provide a periodic repair planning method for power generator by which a generator periodic repair plan can be prepared in a short time, while reducing the time for searching a solution by a depth-first search method. SOLUTION: In this method, a periodic repair schedule for power generates in territory such as a lead-dispatching office and a system control office in an electric system including their repairing period is optimized in evaluating functions concerning electric system operation under various restricting conditions, based on the rated power and of the generator and the period required for its repair and an estimated demand at a consideration period for period as a whole to be the object of the repair schedule as input information. The consideration period is divided into plural blocks (S11), and solution search is executed successively by the depth-first search method by each block unit in order from an early incoming block among these blocks, thereby to preparing the periodic repair schedule (S12, S13).

4. 发明专利

JPH09222457A FAULT SECTION JUDGING METHOD FOR POWER SYSTEM 失效
公开(公告)号：JPH09222457A
公开(公告)日：1997-08-26
申请号：JP5235496
申请日：1996-02-15
申请人： FUJI ELECTRIC CO LTD
发明人： MATSUI TETSUO , KOIKE TOMOHIRO , UEKI YOSHITERU , SAITO TOSHIYA
IPC分类号： G01R31/08 , H02H7/26 , H02J13/00
摘要： PROBLEM TO BE SOLVED: To enable speeding up and higher accuracy of the judgment of fault sections by performing a reasoning about a candidate fault section confined to the minimum necessity while utilizing information on changes in condition other than the operation of a protective relay, information from the results of patrolling and the like. SOLUTION: Candidate fault sections are generated within a power failure block of a system and a fault is assumed in the sections. The resulting assumed operation of a relay is compared with the actual operation of the relay to determine the frequency of malfunctioning. The sections where the frequency exceeds a fixed value are removed to verify the actual operation of the relay while limiting the candidate fault sections thereby judging the fault sections. In this method, the number M of fully operated relays are determined within a power failure block (S2). Assumed candidate fault sections are generated for each power failure block considering a protection range of the operated relays (S3) and the number N of the operated relays protecting the assumed candidate fault sections is determined (S4) to generate the assumed candidate fault sections as true candidate fault sections when a difference between the M and N as mentioned above is below a fixed value for each of the assumed candidate fault sections (S5).

5. 发明专利

JP2001016766A POWER SYSTEM FAILURE SECTION DECISION METHOD 失效
公开(公告)号：JP2001016766A
公开(公告)日：2001-01-19
申请号：JP17671699
申请日：1999-06-23
申请人： FUJI ELECTRIC CO LTD
发明人： KOIKE TOMOHIRO
IPC分类号： G01R31/08 , H02H7/26 , H02J13/00
摘要： PROBLEM TO BE SOLVED: To obtain a power system failure section decision method which can realize both improvement in failure section decision precision and improvement in verification process speed. SOLUTION: An entire power supply interrupted section whose power supply is interrupted by failure cut-off is generated (Step S1). The entire power supply interruption section is divided by the breakers opened before the failure, the breakers opened after a failure on transmission lines and terminal apparatuses among apparatuses in the entire power supply interruption section to generate estimated object power supply interruption sections (Step S2). The estimated object power supply interruption sections are combined to generate power supply interruption blocks (Step S3). A power supply interruption block combination is generated from the power supply interruption blocks (Step S4). The power supply interruption block is localized to decide on a failure section, and the type of the failure is also decided in matching with the power supply interruption block combination (Step S7).

6. 发明专利

JP2000092705A POWER SYSTEM POWER FLOW MONITORING DEVICE 失效
公开(公告)号：JP2000092705A
公开(公告)日：2000-03-31
申请号：JP25795098
申请日：1998-09-11
申请人： CHUBU ELECTRIC POWER , FUJI ELECTRIC CO LTD
发明人： IMAIZUMI NAOHITO , IKEDA NOBUTAKA , FURUI MAKOTO , CHO TOKUHYO , KAMETANI KATSUHISA , TAKENAKA MICHIO , KOIKE TOMOHIRO , WATANABE SHIGERU
IPC分类号： H02J3/00
摘要： PROBLEM TO BE SOLVED: To provide a power system power flow monitoring device which can monitor the power system of a load system quantitatively with high precision without using a human power and, further, can understand a future total system power flow status with high precision, quantitatively and objectively. SOLUTION: A load presumption unit 11 presumes a present end load value (instantaneous value) in accordance with various types of data stored in a system state value storage unit 31, a reference power flow data storage unit 34, an equipment data storage unit 35 and a past record data storage unit 36, and by utilizing the characteristics of a radial system. A load prediction unit 13 predicts an end load value in future (on that day, tommorow, etc.), in accordance with the presumption result of the load presumption unit 11 and data stored in the past record data storage unit 36. A power flow calculation unit 15 calculates a present and future power flow statuses in accordance with data stored in the system state value storage unit 31 and a presumed data storage unit 14, and the present end load value (instantaneous value) presumed by the load presumption unit 11. A system reliability judgement unit 16 can monitor and judge the reliability of a whole object system not only at present but also in future in accordance with the presumption result of the load presumption unit 11 and, further, with the prediction result of the load prediction unit 13.

7. 发明专利

JP2000278864A PREPARATION OF REGULAR REPAIRING SCHEDULE FOR GENERATOR 失效
公开(公告)号：JP2000278864A
公开(公告)日：2000-10-06
申请号：JP7945699
申请日：1999-03-24
申请人： FUJI ELECTRIC CO LTD
发明人： KOIKE TOMOHIRO , TAKENAKA MICHIO
IPC分类号： H02J3/00 , G06Q10/00 , G06Q10/04 , G06Q10/06 , G06Q10/10 , G06Q50/00 , G06Q50/06 , G06Q50/10 , G06F17/60
摘要： PROBLEM TO BE SOLVED: To maximize a minimum capability margin within a prospect period for equalization of the capability margin by dividing the prospect period into a peak zone and and off-peak zone, and maximizing the weighted sum of the minimum capability margin of the zone. SOLUTION: The whole prospect period is divided into a peak zone and an off-peak zone. A constraint condition and an evaluation function which are pre-given using a 0-1 variable corresponding to the operation and repairing of a generator and which should be considered in a regular repairing schedule are formulated as a mixed 0-1 schedule issue. The evaluation function F for supply reliability is formulated as the maximization issue of a weighted sum by the weight parameter wk of a minimum capability margin Rmin(k) within a divided zone (k) shown as an expression. The optimum solution to the formulated issue is determined using a mixed integer programming to prepare the regular repairing schedule of the generator. It is thus possible to evaluate supply reliability over the whole prospect period.

8. 发明专利

JPH10117431A ELECTRIC POWER SYSTEM ACCIDENT ZONE DISCRIMINATION 失效
公开(公告)号：JPH10117431A
公开(公告)日：1998-05-06
申请号：JP26853496
申请日：1996-10-09
申请人： FUJI ELECTRIC CO LTD
发明人： KOIKE TOMOHIRO , MATSUI TETSUO
IPC分类号： G01R31/08 , H02H7/26 , H02J13/00
摘要： PROBLEM TO BE SOLVED: To provide an electric power system accident zone discriminating method, which can attain reduction in processing time and improvement to verification accuracy by extracting only an inflow route of accident current out of routes from a potential accident zone to the end of a power failure zone, and taking only the extracted route as a targeted verification route. SOLUTION: If an accident occurs in an electric power system, an accident zone is discriminated by generating potential accident zone in a power failure zone based on the reach of an operated relay, verifying the correctness of a relay operation for each route from the potential accident zone to the end of power failure zone to detect the number of erroneous relay operations, and minimizing the potential accident zone by eliminating the potential accident zone in which the number of erroneous operations is present in excess of a certain number. In this case, a route in which a breaker with a switching condition before accident kept 'open' is present on a route from the potential accident zone to the end of the power failure zone is eliminated from the targeted routes for verifying the correctness of a relay operation.

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