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1. 发明专利

JPH10124155A PRIMARY VOLTAGE DETECTING METHOD FOR TRANSFORMER, AND ITS APPARATUS 失效
公开(公告)号：JPH10124155A
公开(公告)日：1998-05-15
申请号：JP27427696
申请日：1996-10-17
申请人： TOKYO ELECTRIC POWER CO , MEIDENSHA ELECTRIC MFG CO LTD
发明人： OURA YOSHIFUMI , MATSUZAWA KUNIO , NAKAZAWA GENMARU , NOBATA TAKAHIRO , KUBOTA KENJI , NAKAO YUICHI , SAKAI YOSHITAKA , FUJIMOTO TOSHIRO
IPC分类号： G01R19/00 , G05F1/14 , H01F27/00 , H01F29/02 , H02H3/44
摘要： PROBLEM TO BE SOLVED: To detect primary side voltage lowering and a system voltage lowering phenomenon without the arrangement of PT, etc., on the transformer primary side by calculating the primary side voltage of a transformer through the use of a winding impedance, etc., corresponding to the detected secondary side voltage of the transformer, the current and the tap position signal. SOLUTION: Voltage V2 detected in the secondary side of the transformer, current I2 and the position signal from a tap change-over controller are respectively inputted to a bank primary voltage arithmetic part 12. The winding ratio at every tap position and the table of the impedance are previously prepared in a constant selecting part 21 inside the arithmetic part 12 and the inputted tap position signal refers to the table so as to select the winding wire ratio Nr and the winding wire impedance Zr corresponding to the position signal. A V1 -arithmetic circuit 27 obtains the primary side voltage V1 of the transformer through the use of the arithmetic equation by an arithmetic result which is corrected by a gain correction processing part 26 and the constants.

2. 发明专利

JPH10170557A METHOD FOR DETECTING VOLTAGE-DROP PHENOMENON OF POWER SYSTEM 失效
公开(公告)号：JPH10170557A
公开(公告)日：1998-06-26
申请号：JP32807896
申请日：1996-12-09
申请人： TOKYO ELECTRIC POWER CO , MEIDENSHA ELECTRIC MFG CO LTD
发明人： OURA YOSHIFUMI , MATSUZAWA KUNIO , NAKAZAWA MOTOMARU , NOBATA TAKAHIRO , KUBOTA KENJI , NAKAO YUICHI , SAKAI YOSHITAKA , FUJIMOTO TOSHIRO
IPC分类号： G01R19/165 , G05F1/10 , G05F1/14 , H01F27/42 , H02H3/24 , H02H3/44
摘要： PROBLEM TO BE SOLVED: To detect a primary side voltage drop phenomenon and a system voltage drop phenomenon even if a transformer for measuring instrument and a voltage detector are not installed on the transformer primary side by measuring the time from the start of the integration operation of a voltage adjustment relay to a tap lifting command, judging that the time is equal to or less than a specified time continuously N times, and detecting the reduction state of the primary side voltage of a transformer. SOLUTION: A time measurement circuit 31 measures the time from the start of a 90 relay lifting side integration operation to a tap lifting command after a tap switching signal 66 of a bank transformer and a integrating signal 90INT of a voltage regulation relay 90Ry (90 relay) are inputted. An off delay timer T66 extends the tap switching signal 66. Time judgment parts 35-37 compare the N measurement values of the time measurement circuit 31 and outputs them when a specific condition is met. Logic AND circuits AND 1 and AND 2 outputs a signal from time judgment parts 35-37 when an output signal is available from an integration operation continuous judgment circuit 32. A logic OR circuit OR 4 passes the signal of the logic AND circuits AND 1 and AND 2 as detection output.

3. 发明专利

JP2004254481A Method, system, program, and storage medium for creating power flow data of electric power system and system for indicating voltage profile of electric power station 有权
公开(公告)号：JP2004254481A
公开(公告)日：2004-09-09
申请号：JP2003044885
申请日：2003-02-21
申请人： Tokyo Electric Power Co Inc:The , 東京電力株式会社
发明人： NAKADA NAOHISA , NAKAO YUICHI , FUKUDA TAKUKO
IPC分类号： H02J3/00
摘要： PROBLEM TO BE SOLVED: To provide a method wherein the power flow data of an electric power system can be created with ease. SOLUTION: In the method for creating the power flow data of an electric power system, power flow data is created as follows: the NTR data with converged demand 0MW is created without altering data related to the connecting state/constants of the electric power system. Using the load increasing a function of a VQC simulation program, the voltage is automatically adjusted and returned from the NTR with demand 0MW to the generator output, active power load, and reactive power load of the original power flow data that has not been converged. COPYRIGHT: (C)2004,JPO&NCIPI

4. 发明专利

JP2000041334A METHOD FOR ANALYZING DYNAMIC CHARACTERISTICS FOR REACTIVE POWER OF POWER SYSTEM 失效
公开(公告)号：JP2000041334A
公开(公告)日：2000-02-08
申请号：JP20772798
申请日：1998-07-23
申请人： NISSIN ELECTRIC CO LTD , TOKYO ELECTRIC POWER CO
发明人： KAMURA TSUTOMU , FUKUNAGA TETSUYA , MATSUZAWA KUNIO , NAKAO YUICHI
IPC分类号： H02J3/00 , G01R21/00 , G01R29/00 , H02J3/18
摘要： PROBLEM TO BE SOLVED: To more precisely analyze the dynamic characteristic of the reactive power of a power system with analysis of the dynamic characteristic by using an analyzing model for analyzing dynamic characteristic of reactive power which is set through correction using a C-term estimated value. SOLUTION: At the time of analyzing the reactive power Q at a load L, it is necessary to deduct the amount of the reactive power based on the charging capacity C of a system load connected in parallel with the load L. The amount of the reactive power is expressed, in such a way that the amount is proportional to the square of a step-like voltage change by giving the voltage change. In addition, the charging capacity C of the system load can be estimated by an arbitrary method, and the estimated value is called a C-term estimated value. Similarly, a load characteristic constant Ng of the reactive power can also be estimated by an arbitrary method. With the acquisition of the C-term estimated value and the load characteristic Ng of the reactive power, the dynamic characteristic of the reactive power Q is analyzed by using a reactive power characteristic analyzing model shown by the formula, where V0 and Vi respectively represent the voltage before and after making the step-like change and Vk, V', and Δt respectively represent the voltage when a k-th sample is collected during the step-like voltage change, the rated voltage, and intervals among measurement data.

5. 发明专利

JP2006129654A Power system analyzing method and program for implementing the same 审中-公开
标题翻译：电力系统分析方法及其实施方案
公开(公告)号：JP2006129654A
公开(公告)日：2006-05-18
申请号：JP2004317487
申请日：2004-11-01
申请人： Tokyo Electric Power Co Inc:The , 東京電力株式会社
发明人： NAKAMURA NOBORU , SATO SHINJI , NAKAO YUICHI
IPC分类号： H02J3/00
摘要： PROBLEM TO BE SOLVED: To meet actual situations with higher calculation precision in addition to shortening of the time for power system analysis by changing a simulation model for a three-phase and three-winding transformer and provide a power system analyzing method and a program for implementing the analyzing method. SOLUTION: In this power system analyzing method by load-flow calculation, the simulation of the transformer connected within a power system is performed by performing Y-Δ conversion on the basis of impedance data (primary impedance, secondary impedance, tertiary impedance) of respective windings of sections constituting the three-phase and three-winding transformer. COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：通过改变三相和三绕组变压器的仿真模型，除了缩短电力系统分析时间外，还要更高的计算精度满足实际情况，并提供电力系统分析方法和用于实施分析方法的程序。
解决方案：在该电力系统分析方法中，通过负载流量计算，通过基于阻抗数据（主阻抗，二次阻抗，三次阻抗）进行Y-Δ转换来执行在电力系统内连接的变压器的模拟）构成三相和三绕组变压器的各部分绕组。版权所有（C）2006，JPO＆NCIPI

6. 发明专利

JPH1028327A DEVICE AND METHOD FOR ESTIMATING CHARACTERISTICS OF POWER SYSTEM 失效
公开(公告)号：JPH1028327A
公开(公告)日：1998-01-27
申请号：JP18048496
申请日：1996-07-10
申请人： TOKYO ELECTRIC POWER CO , NISSIN ELECTRIC CO LTD
发明人： NOBATA TAKAHIRO , NAKAO YUICHI , TSUNODA TAKANORI , YOSHIMURA TAKASHI , FUKUNAGA TETSUYA
IPC分类号： G01R21/00 , G01R29/00 , G01R31/00 , H02J3/00
摘要： PROBLEM TO BE SOLVED: To estimate the characteristics of a power system by finding the time sequential data of the active power and reactive power of the power system and respectively smoothing the data on the active power and inactive power, and then, finding the coefficients of the equation expressing the relation between the active power and reactive power as the characteristic values of the power system from the plural pairs of smoothed data. SOLUTION: A sample-hold circuit 3 samples input signals at a prescribed timing and holes the sampled signals, and a microcomputer 6 selects a multiplexer 4 and, at the same time, reads the data converted by means of an A/D converter 5. Then the microcomputer 6 calculates the active power and inactive power of a power system, and the coefficients of the equation expressing the relation between the active power and reactive power by fitting the curve of the equation by using the method of least squares, based on the pairs of the moving average values of the active power and reactive power. Since the coefficients of the equation are estimated from the pairs of the smoothed active power and reactive power, the coefficients can accurately indicate the realistic characteristic values for the power system.

7. 发明专利

JP2000039457A GROUPING METHOD FOR P-Q CORRELATION CURVE OF POWER SYSTEM 失效
公开(公告)号：JP2000039457A
公开(公告)日：2000-02-08
申请号：JP20772898
申请日：1998-07-23
申请人： NISSIN ELECTRIC CO LTD , TOKYO ELECTRIC POWER CO
发明人： KAMURA TSUTOMU , FUKUNAGA TETSUYA , MATSUZAWA KUNIO , NAKAO YUICHI
IPC分类号： G01R21/133 , G01R29/00 , H02J3/00
摘要： PROBLEM TO BE SOLVED: To obtain a grouping method in which, when a P-Q correlation becomes a multistage correlation, it is grouped automatically into several groups and a characteristic constant such as a C-term estimated value or the like is found for every group. SOLUTION: Time-series data on effective power P and reactive power Q are computed. A moving-average processing operation is performed in ST5. After that, the grouping processing operation of a P-Q correlation curve in (1) and (2) in the following is performed. After the grouping processing operation is performed, a parameter such as a C-term estimated value or the like is computed in ST 8 for every group. (1) An inclination Δj=ΔQj/ΔPj in every sample point (j) is found. When Δj

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