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1. 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.

2. 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

3. 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.

4. 发明专利

JP2004235094A Fuel cell system 审中-公开
标题翻译：燃油电池系统
公开(公告)号：JP2004235094A
公开(公告)日：2004-08-19
申请号：JP2003024492
申请日：2003-01-31
申请人： Nissin Electric Co Ltd , 日新電機株式会社
发明人： EMURA TOKUO , FUKUNAGA TETSUYA , KURIO NOBUHIRO
IPC分类号： G05F1/67 , H01M8/04 , H02M3/28 , H02M7/48
CPC分类号： Y02E60/50
摘要： PROBLEM TO BE SOLVED: To reduce cost for making a fuel cell system without a deterioration in the efficiency of the whole system using a low-output voltage stack composed of a small number of stacks of unit cells. SOLUTION: The fuel cell system comprises a fuel cell 1 including a low-output voltage stack composed of two or more stacks of unit cells, in which the number of stacks is smaller than that of in a high-output voltage stack and dimensions of the unit cells are extended up to the same size of total area of the high-output voltage stack. The system also comprises a DC-DC converter 2 equipped with n groups of converting circuits, in which two pairs of switching elements are connected by full bridge configurations, correspondingly to the fuel cells. Switching phases of a pair of switching elements are shifted from each other by 1/3n cycle and switching phases of switching elements of respective converting circuits are shifted one another by 1/2n cycle. COPYRIGHT: (C)2004,JPO&NCIPI
摘要翻译：要解决的问题：为了降低制造燃料电池系统的成本，而不会使用由少量的单位电池堆组成的低输出电压堆叠而使整个系统的效率降低。解决方案：燃料电池系统包括燃料电池1，其包括由两个或更多个堆叠的单元电池组成的低输出电压堆叠，其中堆叠的数量小于高输出电压堆叠的堆叠数，单元电池的尺寸被扩展到高输出电压堆叠的总面积相同的大小。该系统还包括配备有n组转换电路的DC-DC转换器2，其中两对开关元件通过全桥配置连接，对应于燃料电池。一对开关元件的开关相位相互偏移1 / 3n个周期，各转换电路的开关元件的开关相位彼此相差1 / 2n个周期。版权所有（C）2004，JPO＆NCIPI

5. 发明专利

JP2002270890A INPUT CIRCUIT FOR CONTACT INFORMATION 失效
公开(公告)号：JP2002270890A
公开(公告)日：2002-09-20
申请号：JP2001072328
申请日：2001-03-14
申请人： NISSIN ELECTRIC CO LTD
发明人： TSUNODA TAKANORI , FUKUNAGA TETSUYA
IPC分类号： H01L31/12 , H03K17/78
摘要： PROBLEM TO BE SOLVED: To provide a contact information input circuit having decreased power consumption, even by a constitution in which many input contacts are connected and further reduced in the size of a circuit scale than prior art. SOLUTION: In the contact information input circuit 1, signal input terminals for connecting external input contacts are divided into sets into 8 groups, each of eight points, and the input contacts of each set are respectively connected to 8 photocouplers A1 to A8. A voltage applied to confirm on/off states of each input contact is sequentially switched and applied at each predetermined time by photo-MOS relays B1 to B8 of voltage switching circuits. The signal input via the photocoupler at a voltage applying time to each set is transmitted from a data input circuit 21 to a CPU 41. As an operation conforming circuit for confirming the operations of each of the photocouplers A1 to A8 and the photo-MOS relays B1 to B8, photocouplers C1 to C8, diodes TD1 to TD8 and a photo-MOS relay B9 are provided, and the reliability of the input circuit 1 is improved.

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