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81. 发明专利

JPH07255129A EQUIPMENT AND METHOD FOR CONTROLLING SEMICONDUCTOR SWITCH OF SERIES CAPACITOR 失效
公开(公告)号：JPH07255129A
公开(公告)日：1995-10-03
申请号：JP4536394
申请日：1994-03-16
申请人： HITACHI LTD , CHUBU ELECTRIC POWER
发明人： KONISHI HIROO , NISHIMURA MASASHI , NAKAMURA TOMOHARU , FUJITA HIDENORI , KUREBAYASHI HISASHI , YAMAMOTO MAKOTO
IPC分类号： H02J3/16 , G05F1/70
摘要： PURPOSE:To suppress the abnormality of a power system when its series capacitor is connected or its axis torsion signal is generated or its synchronizing signal is eliminated due to a fault, by generating the ignition pulse of its thyristor through the output signal of its synchronizing signal generator which is synchronized with a virtual phase associated with the terminal voltage of its series capacitor. CONSTITUTION:The voltage of an AC power supply 1 is boosted by a transformer 3, and is transmitted to a load side AC power system 2 through two-circuit long-distance transmission lines 41, 42. With both the ends series capacitor devices 51-54 controlled by thyristor controllers 31-34 having identical configurations with each other are connected respectively. In the series capacitor device 52, a series capacitor 501, inverse-parallel thyristors 503, 504 and a series reactor 502 are provided respectively, and when a power transmission is started the capacitor 501 is bypassed by a transmission current through the ignitions of the thyristors 503, 504. The series capacitor device 52 is controlled by the thyristor controller 31 while the terminal voltage of the capacitor 501 and the current of the transmission line 42 are sensed respectively by a PT 505 and a CT 504. Thereby, even if the reference position of the control of the series capacitor is displaced by the starting and fault of the power transmission, the virtual phase for the control is outputted from the controller 31, and as a result, the abnormal phenomenon of the power system is suppressed.

82. 发明专利

JPH01181334A DISTRIBUTION LINE CARRIER CONTROLLER 失效
公开(公告)号：JPH01181334A
公开(公告)日：1989-07-19
申请号：JP608088
申请日：1988-01-14
申请人： HITACHI LTD
发明人： SAKO EIZABURO , MIYAZAKI TERUNOBU , NISHIJIMA KAZUO , NAKAMURA TOMOHARU
IPC分类号： H04B3/54
摘要： PURPOSE:To obtain the information of an object pole switch even if there is a change in the distribution system and a communication path of a slave equipment is not cleared by applying the transmission of other power line carrier transmitter-receiver simultaneously if no reply comes after the transmission of the power line carrier transmitter-receiver in charge of the object slave equipment for acquisition of information. CONSTITUTION:Pole switches a1-a4, b1-b4 and c1-c3 are configurated to attain two-way communication transmission reception of distribution lines La-Lc from distribution substations 1-3. Other ends of the distribution lines La-Lc opposite to power line carrier equipments 4-6 are connected together. Even if the information from a prescribed slave equipment is not obtained by the power line carrier of the communication route including a prescribed slave equipment, the information is obtained from other power line carrier equipment. Thus, even when there is a connection change in the distribution system and the slave equipment is placed at the outside of the initial communication route, the information of the pole switch of the slave equipment is recognized.

83. 发明专利

JPS62277027A REACTIVE POWER COMPENSATOR 失效
公开(公告)号：JPS62277027A
公开(公告)日：1987-12-01
申请号：JP11868586
申请日：1986-05-23
申请人： ELECTRIC POWER DEV CO , HITACHI LTD
发明人： YAMAGUCHI AKIRA , SHIMAMURA HIDEHIKO , MASUKO SHOICHI , KAWAI TADAO , NAKAMURA TOMOHARU
IPC分类号： G05F1/70 , H02J3/18

84. 发明专利

JPS62235614A REACTIVE POWER COMPENSATING DEVICE 失效
公开(公告)号：JPS62235614A
公开(公告)日：1987-10-15
申请号：JP7776386
申请日：1986-04-04
申请人： ELECTRIC POWER DEV CO , HITACHI LTD
发明人： NOSAKA NAOTO , NAKAMURA TOMOHARU
IPC分类号： G05F1/70 , H02J3/18
摘要： PURPOSE:To enable a reactive power compensating device to function effectively by selecting and outputting the output of a constant voltage control means or constant reactive power control means through a selecting circuit. CONSTITUTION:The reactive power compensating device 1 consists of a reactive power generating device 6 constituted by connecting the series circuit of a thyristor 3, a reactor 4, and a transformer 5 to a capacitor 2 and a controller 70 which performs phase control over the thyristor 3. Then a current supplied to the reactor 4 is controlled to control a reactive current continuously. In this case, the control circuit 70 is provided with two loops of a constant power control means 17 which uses a bus voltage VL as a controlled variable and a constant reactive power control means 20 which uses receiving terminal reactive power QL as a controlled variable. Then, a control output selecting circuit 30 is provided and either of the outputs QV and QR of those means 17 and 20 is selected and outputted to an automatic pulse phase shifter 16. Consequently, even variation in the short-circuit impedance of the system is dealt with.

85. 发明专利

JPS602016A PROTECTING SYSTEM OF DC TRANSMISSION LINE 失效
公开(公告)号：JPS602016A
公开(公告)日：1985-01-08
申请号：JP10568983
申请日：1983-06-15
申请人： HITACHI LTD
发明人： KAWAI TADAO , FUJITA HIROSHI , NAKAMURA TOMOHARU
IPC分类号： H02H3/26

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