US3675002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for computing electric power flow
Assignee: Mitsubishi Electric Corp
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Filing: 1970-06-23
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Granted: 1972-07-04
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Expires: 1990-06-23
Abstract
Abstract Disclosed herein is a simulated power system including a network of resistances, power sources, and loads corresponding respectively to line reactances, generators, and loads of an actual power system, and further including measuring devices for determining voltages and current flow between selected nodes (e.g. m and n) of the network, wherein the active power Pmn and the reactive power Qmn through the branch between the nodes can be calculated rapidly according to the formulas WHERE theta M AND theta N ARE THE PHASE ANGLES AT THE RESPECTIVE NODES AND ARE PROPORTIONAL TO THE VOLTAGES AT THE NODES, AND Delta Vm and Delta Vn are difference voltages between actual and standard voltages at the selected nodes. In the simulated system the power sources are provided by constant current supply devices or constant voltage devices, and the load units are provided by constant current withdrawal devices, wherein the power sources and loads are connected to predetermined nodes of the network.
Inventors
- 👤 Tsuneo Mitsui
- 👤 Jun-Ichi Baba
- 👤 Ikuo Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:34
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/48; G06G7/62; G06G7/63
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
192 words
A simulated power system for use in computing power flow in an actual power system, said simulated power system comprising resistance network means including a plurality of resistors connected respectively between a plurality of pairs of terminals which define a plurality of nodes of said network, said network means corresponding to a transmission system of said actual power system, simulated power means for supplying power to said network means and including a separate simulated power source for each power source of the actual system, each of said simulated power source being coupled to a respective node to apply a voltage to said node, simulated load means for simulating loading characteristics of said actual system and including a separate constant current generator means for each load of the actual system, each said constant current generator means being coupled to a respective node for drawing current therefrom, current meter means connected to said network means for measuring current levels through each one of said resistors and voltage meter means for measuring levels at each of said nodes, said simulated power source and load means to simulate the actual system in accordance with the equations
Claim 2
Dependent Claim
192 words
A simulated power system for use in computing power flow in an actual power system, said simulated power system comprising resistance network means including a plurality of resistors connected respectively between a plurality of pairs of terminals which define a plurality of nodes of said network, said network means corresponding to a transmission system of said actual power system, simulated power means for supplying power to said network means and including a separate simulated power source for each power source of the actual system, each of said simulated power source being coupled to a respective node to apply a voltage to said node, simulated load means for simulating loading characteristics of said actual system and including a separate constant current generator means for each load of the actual system, each said constant current generator means being coupled to a respective node for drawing current therefrom, current meter means connected to said network means for measuring current levels through each one of said resistors and voltage meter means for measuring levels at each of said nodes, said simulated power source and load means to simulate the actual system in accordance with the equations
Claim 3
Dependent Claim
133 words
A simulated power system as set forth in claim 1, in which said simulated power source includes a DC potential source, a potentiometer having an adjustable tap, and having end leads connected across said potential source, an operational amplifier having first and second inputs and having an output, said first input being connected to said tap, a feedback resistor having a first terminal connected to said operational amplifier output and a second terminal coupled to a respective one of said respective power source nodes, and an inverter circuit coupled between said second terminal of said feedback resistor and said second input of said operational amplifier, whereby a constant current source is provided at said second terminal of said feedback resistor, said constant current being variable with a variation of position of said tap.
Claim 4
Dependent Claim
82 words
A simulated power system as set forth in claim 2, further comprising switching means connected to said feedback resistor and said inverter circuit, and means for operating said switching means to an actuated position to disconnect said inverter circuit from its said circuit connection with said operational amplifier, and to provide a short circuit across said feedback resistor, whereby a constant voltage is provided at said second terminal of said feedback resistor upon operation of said switch means to said actuated position.
Claim 5
Dependent Claim
73 words
A simulated power system as set forth in claim 2, in which said potentiometer has a grounded center-tap, wherein said adjustable tap is positionable to apply selectively a negative or positive voltage to said first input of said operational amplifier, whereby said second terminal of said feedback resistor provides selectively a constant current source or a constant current drain for use respectively as a said simulated power source or a said simulated load.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |