EP0243937A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Variable-speed pumped-storage power generating system
Assignee: Hitachi Ltd
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Filing: 1987-04-28
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Granted: —
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Expires: 2007-04-28
Abstract
Abstract A variable-speed pumped-storage power generating system includes a variable-speed driver composed of a generator/motor (l) and a frequency converter (4) connected to an electric power system (5) and a pump/turbine (6) driven by the generator/motor. The power generating system comprises an optimum rotation speed function generator (l2) calculating, on the basis of at least an externally applied output command signal, an optimum rotation speed of the motor for driving the pump with high efficiency, a speed detector (2) generating a speed detection signal by detecting the actual rotation speed of the motor, a speed regulator (l6) receiving the output signals of the function generator and speed detector to generate an output correction signal for decreasing the speed error to zero, an adder (l0l) adding the output correction signal to the output command signal, a comparator (l02) comparing the output signal of the adder with an output power detection signal generated from a motor output detector (40) and generating an error signal therebetween, and an output regulator (8) controlling the excitation of the secondary winding of the motor through the frequency converter to decrease the output power error to zero, thereby controlling the output and rotation speed of the motor. The power generating system also comprises an optimum guide-vane opening function generator (l3) calculating an optimum guide vane opening on the basis of at least the output command signal, a comparator (l03) comparing the output signal of the second function generator with a guide-vane opening detection signal from a guide-vane opening detector (70), and a guide-vane opening regulator (9) controlling the opening of the guide vanes according to the result of comparison.
Inventors
- 👤 Akihiro Sakayori
- 👤 Takao C/O Hitachi Ltd. Kuwabara
- 👤 Akira Bando
- 👤 Yasuteru Ono
- 👤 Shigeaki Hayashi
- 👤 Isao Yokoyama
- 👤 Kenzyu Ogiwara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 05:07
CPC Classifications
F; F03; F03B; F03B15/00; F03B15/02; F03B15/04; F03B15/06; H; H02; H02P; H02P9/00; H02P9/007; H02P9/42; H02P2101/00; H02P2101/10; Y; Y02; Y02E; Y02E10/00; Y02E10/20
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
96 words
A variable-speed pumped-storage power generating system including a generator/motor (l) having a primary winding connected to an electric/power system (5) and a secondary winding connected to said electric power system through a frequency converter (4), and a turbine/pump (6) directly coupled to the shaft of said generator/motor, said power generating system comprising means (l0) for controlling the firing angle of said frequency converter according to an error signal between an output command signal commanding an output power required for said power generating system and a power signal indicative of an actual output power of said generator/motor.
Claim 2
Dependent Claim
96 words
A variable-speed pumped-storage power generating system including a generator/motor (l) having a primary winding connected to an electric/power system (5) and a secondary winding connected to said electric power system through a frequency converter (4), and a turbine/pump (6) directly coupled to the shaft of said generator/motor, said power generating system comprising means (l0) for controlling the firing angle of said frequency converter according to an error signal between an output command signal commanding an output power required for said power generating system and a power signal indicative of an actual output power of said generator/motor.
Claim 3
Dependent Claim
50 words
A variable-speed pumped-storage power generating system according to Claim l, wherein said output command signal commanding the output power required for said power generating system is applied from a central load-dispatching office generally controlling said electric power system and includes an automatic frequency control signal of the electric power system.
Claim 4
Dependent Claim
131 words
A variable-speed pumped-storage power generating system including a generator/motor (l) having a primary winding connected to an electric power system (5) and a secondary winding connected to said electric power system through a frequency converter (4), and a turbine/pump (6) directly coupled to the shaft of said generator/motor, said power generating system comprising means (l0) for producing a target power signal by adding an error signal representing the difference between an actual rotation speed and a target rotation speed of said generator motor to an outpt command signal commanding an output power required for said power generating system, and controlling the firing angle of said frequency converter according to an error signal between said target power signal and a power feedback signal feeding back an actual output power of said generator/motor.
Claim 5
Dependent Claim
131 words
A variable-speed pumped-storage power generating system including a generator/motor (l) having a primary winding connected to an electric power system (5) and a secondary winding connected to said electric power system through a frequency converter (4), and a turbine/pump (6) directly coupled to the shaft of said generator/motor, said power generating system comprising means (l0) for producing a target power signal by adding an error signal representing the difference between an actual rotation speed and a target rotation speed of said generator motor to an outpt command signal commanding an output power required for said power generating system, and controlling the firing angle of said frequency converter according to an error signal between said target power signal and a power feedback signal feeding back an actual output power of said generator/motor.
Claim 6
Dependent Claim
50 words
A variable-speed pumped-storage power generating system according to Claim 3, wherein said output command signal commanding the output power required for said power generating system is applied from a central load-dispatching office generally controlling said electric power system and includes an automatic frequency control signal of the electric power system.
Claim 7
Dependent Claim
87 words
A variable-speed pumped-storage power generating system including a generator/motor (l) having a primary winding connected to an electric power system (5) and a secondary winding connected to said electric power system through a frequency converter (4), and a turbine/pump (6) directly coupled to the shaft of said generator motor, said power generating system comprising means (l0) for controlling the firing angle of said frequency converter so as to provide a predetermined electrical output power and a predetermined rotation speed of said generator/motor in said power generating system.
Claim 8
Dependent Claim
87 words
A variable-speed pumped-storage power generating system including a generator/motor (l) having a primary winding connected to an electric power system (5) and a secondary winding connected to said electric power system through a frequency converter (4), and a turbine/pump (6) directly coupled to the shaft of said generator motor, said power generating system comprising means (l0) for controlling the firing angle of said frequency converter so as to provide a predetermined electrical output power and a predetermined rotation speed of said generator/motor in said power generating system.
Claim 9
Dependent Claim
116 words
A variable-speed pumped-storage power generating system including a generator/motor (l) having a primary winding connected to an electric power system (5) and a secondary winding connected to said electric power system through a frequency converter (4), and a tubine/pump (6) coupled directly to the shaft of said generator/motor and having guide vanes whose opening is variable, said power generating system comprising means (l0) for controlling the firing angle of said frequency generator so as to provide a predetermined electrical output power and a predetermined rotation speed of said generator/motor in said power generating system, and means (30) for controlling the opening of the guide vanes of said turbine/pump so as to provide an optimum guide-vane opening.
Claim 10
Dependent Claim
116 words
A variable-speed pumped-storage power generating system including a generator/motor (l) having a primary winding connected to an electric power system (5) and a secondary winding connected to said electric power system through a frequency converter (4), and a tubine/pump (6) coupled directly to the shaft of said generator/motor and having guide vanes whose opening is variable, said power generating system comprising means (l0) for controlling the firing angle of said frequency generator so as to provide a predetermined electrical output power and a predetermined rotation speed of said generator/motor in said power generating system, and means (30) for controlling the opening of the guide vanes of said turbine/pump so as to provide an optimum guide-vane opening.
Claim 11
Dependent Claim
293 words
A variable-speed pumped-storage power generating system including a generator/motor (l) having a primary winding connected to an electric power system (5) and a secondary winding connected to said electric power system through a frequency converter (4), and turbine/pump (6) directly coupled to the shaft of said generator/motor and having guide vanes (7) whose opening is variable, said power generating system comprising a first function generator (l2) generating a target rotation speed signal on the basis of at least an output command signal commanding an output power required for said power generating system, a speed regulator (l6) generating an output signal corresponding to an error signal between the outpt signal of said first function generator and a rotation speed signal representing an actual rotation speed of said generator/motor, an adder (l0l) adding the output signal of said speed regulator to said output command signal commanding the output power required for said power generating system thereby generating a composite target output command signal, an output regulator (8) generating an output signal corresponding to an error signal between the output signal of said adder and a power signal representing an actual output power of said generator/motor, the firing angle of said frequency converter (4) being controlled by the output signal of said output controller, a second function generator (l3) generating a target guide-vane opening signal on the basis of at least said output command signal commanding the output power required for said power generating system, and a guide-vane opening regulator (9) generating an output signal corresponding to an error signal between the output signal of said second function generator and a guide-vane opening signal representing an actual opening of the guide vanes of said turbine/pump thereby controlling the opening of the guide vanes of said turbine/pump.
Claim 12
Dependent Claim
293 words
A variable-speed pumped-storage power generating system including a generator/motor (l) having a primary winding connected to an electric power system (5) and a secondary winding connected to said electric power system through a frequency converter (4), and turbine/pump (6) directly coupled to the shaft of said generator/motor and having guide vanes (7) whose opening is variable, said power generating system comprising a first function generator (l2) generating a target rotation speed signal on the basis of at least an output command signal commanding an output power required for said power generating system, a speed regulator (l6) generating an output signal corresponding to an error signal between the outpt signal of said first function generator and a rotation speed signal representing an actual rotation speed of said generator/motor, an adder (l0l) adding the output signal of said speed regulator to said output command signal commanding the output power required for said power generating system thereby generating a composite target output command signal, an output regulator (8) generating an output signal corresponding to an error signal between the output signal of said adder and a power signal representing an actual output power of said generator/motor, the firing angle of said frequency converter (4) being controlled by the output signal of said output controller, a second function generator (l3) generating a target guide-vane opening signal on the basis of at least said output command signal commanding the output power required for said power generating system, and a guide-vane opening regulator (9) generating an output signal corresponding to an error signal between the output signal of said second function generator and a guide-vane opening signal representing an actual opening of the guide vanes of said turbine/pump thereby controlling the opening of the guide vanes of said turbine/pump.
Claim 13
Dependent Claim
229 words
A variable-speed pumped-storage power generating system including a generator/motor (l) having a primary winding connected to an electric power system (5) and a secondary winding connected to said electric power system through a frequency converter (4), and a turbine/pump (6) directly coupled to the shaft of said generator/motor, said power generating system comprising a first function generator (l2) generating a target rotation speed signal on the basis of at least an output command signal commanding an output power required for said power generating system, a speed regulator (l6) generating an output signal corresponding to an error signal between the output signal of said first function generator and a rotation speed signal representing an actual rotation speed of said generator/motor, an adder (l0l) adding the output signal of said speed regulator to said output command signal commanding the output power required for said power generating system thereby generating a composite target output command signal, and an output regulator (8) generating an output signal corresponding to an error signal between the output signal of said adder and a power signal representing an actual output power of said generator/motor, the firing angle of said frequency converter (4) being controlled by the output signal of said output controller, said first function generator setting the rotation speed of said generator/motor at a relatively high speed when said power generating system starts its pumping operation.
Claim 14
Dependent Claim
229 words
A variable-speed pumped-storage power generating system including a generator/motor (l) having a primary winding connected to an electric power system (5) and a secondary winding connected to said electric power system through a frequency converter (4), and a turbine/pump (6) directly coupled to the shaft of said generator/motor, said power generating system comprising a first function generator (l2) generating a target rotation speed signal on the basis of at least an output command signal commanding an output power required for said power generating system, a speed regulator (l6) generating an output signal corresponding to an error signal between the output signal of said first function generator and a rotation speed signal representing an actual rotation speed of said generator/motor, an adder (l0l) adding the output signal of said speed regulator to said output command signal commanding the output power required for said power generating system thereby generating a composite target output command signal, and an output regulator (8) generating an output signal corresponding to an error signal between the output signal of said adder and a power signal representing an actual output power of said generator/motor, the firing angle of said frequency converter (4) being controlled by the output signal of said output controller, said first function generator setting the rotation speed of said generator/motor at a relatively high speed when said power generating system starts its pumping operation.
Claim 15
Dependent Claim
245 words
A variable-speed pumped-storage power generating system including a generator/motor (l) having a primary winding connected to an electric power system (5) and a secondary winding connected to said electric power system through a frequency converter (4), and a turbine/pump (6) directly coupled to the shaft of said generator/motor, said power generating system comprising a first function generator (l2) generating a target rotation speed signal on the basis of at least an output command signal commanding an output power required for said power generating system, a speed regulator (l6) generating an output signal corresponding to an error signal between the output signal of said first function generator and a rotation speed signal representing an actual rotation speed of said generator/motor, an adder (l0l) adding the output signal of said speed regulator to said output command signal commanding the output power required for said power generating system thereby generating a composite target output command signal, and an output regulator (8) generating an output signal corresponding to an error signal between the output signal of said adder and a power signal representing an actual output power of said generator/motor, the firing angle of said frequency converter (4) being controlled by the output signal of said output controller, said first function generator providing a target rotation speed which changes abruptly in the vicinity of the rated rotation speed of said generator/motor so as to prevent said generator/motor from continuously operating at a speed close to the rated rotation speed.
Claim 16
Dependent Claim
245 words
A variable-speed pumped-storage power generating system including a generator/motor (l) having a primary winding connected to an electric power system (5) and a secondary winding connected to said electric power system through a frequency converter (4), and a turbine/pump (6) directly coupled to the shaft of said generator/motor, said power generating system comprising a first function generator (l2) generating a target rotation speed signal on the basis of at least an output command signal commanding an output power required for said power generating system, a speed regulator (l6) generating an output signal corresponding to an error signal between the output signal of said first function generator and a rotation speed signal representing an actual rotation speed of said generator/motor, an adder (l0l) adding the output signal of said speed regulator to said output command signal commanding the output power required for said power generating system thereby generating a composite target output command signal, and an output regulator (8) generating an output signal corresponding to an error signal between the output signal of said adder and a power signal representing an actual output power of said generator/motor, the firing angle of said frequency converter (4) being controlled by the output signal of said output controller, said first function generator providing a target rotation speed which changes abruptly in the vicinity of the rated rotation speed of said generator/motor so as to prevent said generator/motor from continuously operating at a speed close to the rated rotation speed.
Claim 17
Dependent Claim
97 words
l0. A variable-speed pumped-storage power generating system including a generator/motor (l) having a primary winding connected through a frequency converter (4) to an electric power system (5) and a secondary winding mounted on its rotary shaft, and a turbine/pump (6) directly coupled to the shaft of said generator/motor, said power generating system comprising means (l0) for controlling the firing angle of said frequency converter according to an error signal between an output command signal commanding an output power required for said power generating system and a power signal indicative of an actual output power of said generator/motor.
Claim 18
Dependent Claim
97 words
l0. A variable-speed pumped-storage power generating system including a generator/motor (l) having a primary winding connected through a frequency converter (4) to an electric power system (5) and a secondary winding mounted on its rotary shaft, and a turbine/pump (6) directly coupled to the shaft of said generator/motor, said power generating system comprising means (l0) for controlling the firing angle of said frequency converter according to an error signal between an output command signal commanding an output power required for said power generating system and a power signal indicative of an actual output power of said generator/motor.
Claim 19
Dependent Claim
129 words
A variable-speed pumped-storage power generating system including a generator/motor (l) having a primary winding connected through a frequency converter (4) to an electric power system (5) and a secondary winding mounted on its rotary shaft, and a turbine/pump (6) directly coupled to the shaft of said generator/motor, said power generating system comprising means (l0) for producing a target power signal by adding an error signal representing the difference between an actual rotation speed and a target rotation speed of said generator/motor to an output command signal commanding an output power required for said power generating system, and controlling the firing angle of said frequency converter according to an error signal between said target power signal and a power feedback signal feeding back an actual output power of said generator/motor.
Claim 20
Dependent Claim
129 words
A variable-speed pumped-storage power generating system including a generator/motor (l) having a primary winding connected through a frequency converter (4) to an electric power system (5) and a secondary winding mounted on its rotary shaft, and a turbine/pump (6) directly coupled to the shaft of said generator/motor, said power generating system comprising means (l0) for producing a target power signal by adding an error signal representing the difference between an actual rotation speed and a target rotation speed of said generator/motor to an output command signal commanding an output power required for said power generating system, and controlling the firing angle of said frequency converter according to an error signal between said target power signal and a power feedback signal feeding back an actual output power of said generator/motor.
Claim 21
Dependent Claim
284 words
A variable-speed pumped-storage power generating system including a generator/motor (l) having a primary winding connected through a frequency converter (4) to an electric power system (5) and a secondary winding mounted on its rotary shaft, and a turbine/pump (6) directly coupled to the shaft of said generator/motor, said power generating system comprising a first function generator (l2) generating a target rotation speed signal on the basis of at least an output command signal commanding an output power required for said power generating system, a speed regulator (l6) generating an output signal corresponding to an error signal between the output signal of said first function generator and a rotation speed signal representing an actual rotation speed of said generator/motor, an adder (l0l) adding the output signal of said speed regulator to said output command signal commanding the output power required for said power generating system thereby generating a composite target output command signal, an output regulator (8) generating an output signal corresponding to an error signal between the output signal of said adder and a power signal representing an actual output power of said generator/motor, the firing angle of said frequency converter (4) being controlled by the output signal of said output controller, a second function generator (l3) generating a target guide-vane opening signal on the basis of at least said output command signal commanding the output power required for said power generating system, and a guide-vane opening regulator (9) generating an output signal corresponding to an error signal between the output signal of said second function generator and a guide-vane opening signal representing an actual opening of the guide vanes of said turbine/pump thereby controlling the opening of the guide vanes of said turbine/pump.
Claim 22
Dependent Claim
284 words
A variable-speed pumped-storage power generating system including a generator/motor (l) having a primary winding connected through a frequency converter (4) to an electric power system (5) and a secondary winding mounted on its rotary shaft, and a turbine/pump (6) directly coupled to the shaft of said generator/motor, said power generating system comprising a first function generator (l2) generating a target rotation speed signal on the basis of at least an output command signal commanding an output power required for said power generating system, a speed regulator (l6) generating an output signal corresponding to an error signal between the output signal of said first function generator and a rotation speed signal representing an actual rotation speed of said generator/motor, an adder (l0l) adding the output signal of said speed regulator to said output command signal commanding the output power required for said power generating system thereby generating a composite target output command signal, an output regulator (8) generating an output signal corresponding to an error signal between the output signal of said adder and a power signal representing an actual output power of said generator/motor, the firing angle of said frequency converter (4) being controlled by the output signal of said output controller, a second function generator (l3) generating a target guide-vane opening signal on the basis of at least said output command signal commanding the output power required for said power generating system, and a guide-vane opening regulator (9) generating an output signal corresponding to an error signal between the output signal of said second function generator and a guide-vane opening signal representing an actual opening of the guide vanes of said turbine/pump thereby controlling the opening of the guide vanes of said turbine/pump.
References Cited (Backward Citations)
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