US5317525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric power system simulator
Assignee: Mitsubishi Electric Corp
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Filing: 1991-03-05
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Granted: 1994-05-31
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Expires: 2011-03-05
Abstract
Abstract An electric power system simulator comprising first calculator which calculates a generator dynamic characteristic, second calculator which calculates a load dynamic characteristic and third calculator which calculates power transmission condition of an electric power system network, then the first calculator cyclically obtains an amplitude and a phase of an internal induced voltage of the generator based on data on an output power and a terminal voltage of the generator, and the second calculator calculates a load equivalent admittance at predetermined time based on data on an A.C. voltage at a load installation point, and the third calculator calculates a current flowing in each element of the electric power system based on respective data obtained by the first calculator and the second calculator and an electric power system network impedance to obtain the output power and terminal voltage of the generator, so that a condition change of the electric power system including the generators is serially simulated by alternately executing the calculations of the first and the second calculators and the calculation of the third calculator.
Inventors
- 👤 Hisao Taoka
- 👤 Isao Iyoda
- 👤 Hideo Noguchi
- 👤 Yukio Kojima
- 👤 Shigeru Warashina
- 👤 Nobuyuki Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:49
CPC Classifications
G; G06; G06J; G06J1/00; G06F; G06F30/00; G06F30/30; G06F30/36; G06F30/367
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
211 words
An electric power system simulator comprising: first calculating means for calculating a dynamic characteristic of a generator by cyclically obtaining an amplitude and a phase of internal induced voltage of said generator based on an output power and a terminal voltage of said generator; second calculating means for calculating a dynamic characteristic of a load by obtaining an equivalent admittance of said load after simulation of the electric power system based on an amplitude of an A.C. voltage at an installation point of said load; and third calculating means for calculating a power transmission condition of the electric power system network, indicative of fault or normal operation, by obtaining the output power and the terminal voltage of said generator by calculating an A.C. current flowing in each element of the electric power system with using the amplitude and the phase of said internal induced voltage of said generator obtained by said first calculating means, the equivalent admittance of said load obtained by said second calculating means and an impedance of the electric power system network; wherein said condition change of the electric power system including said generator is serially simulated by alternately performing the calculations of said first and said second calculating means and the calculation of said third calculating means.
Claim 2
Dependent Claim
211 words
An electric power system simulator comprising: first calculating means for calculating a dynamic characteristic of a generator by cyclically obtaining an amplitude and a phase of internal induced voltage of said generator based on an output power and a terminal voltage of said generator; second calculating means for calculating a dynamic characteristic of a load by obtaining an equivalent admittance of said load after simulation of the electric power system based on an amplitude of an A.C. voltage at an installation point of said load; and third calculating means for calculating a power transmission condition of the electric power system network, indicative of fault or normal operation, by obtaining the output power and the terminal voltage of said generator by calculating an A.C. current flowing in each element of the electric power system with using the amplitude and the phase of said internal induced voltage of said generator obtained by said first calculating means, the equivalent admittance of said load obtained by said second calculating means and an impedance of the electric power system network; wherein said condition change of the electric power system including said generator is serially simulated by alternately performing the calculations of said first and said second calculating means and the calculation of said third calculating means.
Claim 3
Dependent Claim
29 words
The electric power system simulator as set forth in claim 1, wherein the calculation of A.C. current by said third calculating means is performed by a system network calculation.
Claim 4
Dependent Claim
185 words
An electric power system simulator comprising: first calculating means for calculating a dynamic characteristics of a generator; second calculating means for calculating a power transmission condition of an entire electric power system network, indicative of fault or normal operation, for outputting an output power and a terminal voltage of said generator; and communicating means for communicating between said first calculating means and said second calculating means by transferring information; wherein said first calculating means cyclically calculates information on an internal induced voltage of said generator representative of condition of said generator based on the output power and the terminal voltage of said generator outputted from said second calculating means, and outputs said information to said second calculating means through said communicating means, said second calculating means calculates power transmission condition of said electric power system network at predetermined time with using said information and various constants of said electric power system network, and said condition change of the electric power system including said generator is serially simulated by alternately executing the calculation of said first calculating means and the calculation of said second calculating means.
Claim 5
Dependent Claim
185 words
An electric power system simulator comprising: first calculating means for calculating a dynamic characteristics of a generator; second calculating means for calculating a power transmission condition of an entire electric power system network, indicative of fault or normal operation, for outputting an output power and a terminal voltage of said generator; and communicating means for communicating between said first calculating means and said second calculating means by transferring information; wherein said first calculating means cyclically calculates information on an internal induced voltage of said generator representative of condition of said generator based on the output power and the terminal voltage of said generator outputted from said second calculating means, and outputs said information to said second calculating means through said communicating means, said second calculating means calculates power transmission condition of said electric power system network at predetermined time with using said information and various constants of said electric power system network, and said condition change of the electric power system including said generator is serially simulated by alternately executing the calculation of said first calculating means and the calculation of said second calculating means.
Claim 6
Dependent Claim
49 words
An electric power system simulator as set forth in claim 3, wherein said second calculating means comprises a calculating unit which calculates the power transmission condition of said electric power system network, and a time management unit which makes said calculating unit calculate by indicating every cycle for calculation.
Claim 7
Dependent Claim
248 words
An electric power system simulator comprising: first calculating means, having phase calculating means for calculating a phase of internal induced voltage of a generator, phase correcting means for correcting calculated phase value by said phase calculating means by subtracting from the calculated phase value by value of 360° multiplied by an integer or adding to the calculated phase value by value of 360° multiplied by an integer when an absolute value of the phase value calculated by said phase calculating means exceeds 360°, and amplitude calculating means for calculating an amplitude of internal induced voltage of said generator, and for calculating a dynamic characteristic of a generator; and second calculating means for calculating a power transmission condition of an entire electric power system network, indicative of fault or normal operation; wherein said first calculating means cyclically calculates an amplitude and the phase of internal induced voltage of said generator representative of condition of said generator based on the output power and the terminal voltage of said generator outputted from said second calculating means, and outputs an information of calculated result to said second calculating means, said second calculating means calculates power transmission condition of said electric power system network at predetermined time with using said information and various constants of said electric power system network, and said condition change of the electric power system including said generator is serially simulated by alternately executing the calculation of said first calculating means and the calculation of said second calculating means.
Claim 8
Dependent Claim
248 words
An electric power system simulator comprising: first calculating means, having phase calculating means for calculating a phase of internal induced voltage of a generator, phase correcting means for correcting calculated phase value by said phase calculating means by subtracting from the calculated phase value by value of 360° multiplied by an integer or adding to the calculated phase value by value of 360° multiplied by an integer when an absolute value of the phase value calculated by said phase calculating means exceeds 360°, and amplitude calculating means for calculating an amplitude of internal induced voltage of said generator, and for calculating a dynamic characteristic of a generator; and second calculating means for calculating a power transmission condition of an entire electric power system network, indicative of fault or normal operation; wherein said first calculating means cyclically calculates an amplitude and the phase of internal induced voltage of said generator representative of condition of said generator based on the output power and the terminal voltage of said generator outputted from said second calculating means, and outputs an information of calculated result to said second calculating means, said second calculating means calculates power transmission condition of said electric power system network at predetermined time with using said information and various constants of said electric power system network, and said condition change of the electric power system including said generator is serially simulated by alternately executing the calculation of said first calculating means and the calculation of said second calculating means.
Claim 9
Dependent Claim
102 words
An electric power system simulator connected to an external data source comprising: an analog type simulator which simulates a phenomenon of an electric power system by combining a plurality of simulation devices each of which simulates each element constituting electric power system; a digital type simulator which calculates a phenomenon of the electric power system, based on data supplied from said external data source, at a speed same as or near the proceeding speed of the real phenomenon and simulates the phenomenon in real time; and an A/D-D/A converter which transfers data between said analog type simulator and said digital type simulator.
Claim 10
Dependent Claim
102 words
An electric power system simulator connected to an external data source comprising: an analog type simulator which simulates a phenomenon of an electric power system by combining a plurality of simulation devices each of which simulates each element constituting electric power system; a digital type simulator which calculates a phenomenon of the electric power system, based on data supplied from said external data source, at a speed same as or near the proceeding speed of the real phenomenon and simulates the phenomenon in real time; and an A/D-D/A converter which transfers data between said analog type simulator and said digital type simulator.
Claim 11
Dependent Claim
86 words
An electric power system simulator connected to an external data source comprising: a digital type simulator which calculates a phenomenon of an electric power system based on data supplied from said external data source at a speed same as or near the proceeding speed of the real phenomenon and simulates the phenomenon in real time; and a man-machine device which displays information outputted from said digital type simulator and is able to perform interruption for a condition change to said digital type simulator in real time.
Claim 12
Dependent Claim
86 words
An electric power system simulator connected to an external data source comprising: a digital type simulator which calculates a phenomenon of an electric power system based on data supplied from said external data source at a speed same as or near the proceeding speed of the real phenomenon and simulates the phenomenon in real time; and a man-machine device which displays information outputted from said digital type simulator and is able to perform interruption for a condition change to said digital type simulator in real time.
References Cited (Backward Citations)
US3551893A
Cited
US3808409A
Cited
US3825732A
Cited
US3833927A
Cited
US3883724A
Cited
JPS50161651A
Cited
US3976868A
Cited
JPH01245493A
Cited
JPH0227886A
Cited
US4985860A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-05-30 | 1997-11-29 | 1998-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-30 | 2001-11-29 | 2002-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-30 | 2005-11-29 | 2006-05-31 | $7700.00 | Window Closed / Lapsed |