US5734586A
Expired / Lapsed
US
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System for achieving optimal steady state in power distribution networks
Assignee: Cornell Research Foundation Inc
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Filing: 1995-05-05
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Granted: 1998-03-31
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Expires: 2015-05-05
Abstract
Abstract The present invention features a direct, closed-loop method for controlling an unbalanced, power-distribution network having a great number of nodes, branches and laterals, as well as multiphase loads. The network has a radial structure. One or more formulae are first derived for a power-distribution network. The formulae may be an explicit loss formula, a voltage formula, a line flow formula or any combination thereof. Network flow programming techniques which incorporate the formulae are then developed to directly achieve steady state. Finally, the control steps are performed on the power-distribution network in real time to control its operation. The control steps may include placing a capacitor, regulator or switch at a specific position in the network and/or reconfiguring the network in some other manner.
Inventors
- 👤 Hsiao-Dong Chiang
- 👤 Jin-Cheng Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:55
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/12; H02J3/16; Y; Y02; Y02E; Y02E40/00; Y02E40/30
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
87 words
A closed-form method for controlling an unbalanced, power-distribution network, comprising: a) deriving a formula, including a fundamental, explicit loss formula for a predetermined power-distribution network; b) applying network flow programming techniques, incorporating said formula, directly to said power-distribution network in order to determine control steps necessary to achieve optimal, steady state therefor; c) estimating the effect of said control steps on said power-distribution network prior to application thereof; and d) performing said control steps on said power-distribution network in real time so as to control operation thereof.
Claim 2
Dependent Claim
87 words
A closed-form method for controlling an unbalanced, power-distribution network, comprising: a) deriving a formula, including a fundamental, explicit loss formula for a predetermined power-distribution network; b) applying network flow programming techniques, incorporating said formula, directly to said power-distribution network in order to determine control steps necessary to achieve optimal, steady state therefor; c) estimating the effect of said control steps on said power-distribution network prior to application thereof; and d) performing said control steps on said power-distribution network in real time so as to control operation thereof.
Claim 3
Dependent Claim
24 words
The closed-form method for controlling an unbalanced, power-distribution network in accordance with claim 1, wherein performing said control steps comprises reconfiguring said power-distribution network.
Claim 4
Dependent Claim
49 words
The closed-form method for controlling an unbalanced, power-distribution network in accordance with claim 1, wherein performing said control steps comprises placing a predetermined capacitor at a predetermined position in said power-distribution network, said placement and position of said capacitor being dependent upon a solution of said explicit loss formula.
Claim 5
Dependent Claim
22 words
The closed-form method for controlling an unbalanced, power-distribution network in accordance with claim 1, wherein said formula further comprises a voltage formula.
Claim 6
Dependent Claim
23 words
The closed-form method for controlling an unbalanced, power-distribution network in accordance with claim 4, wherein said formula further comprises a line flow formula.
Claim 7
Dependent Claim
27 words
The closed-form method for controlling an unbalanced, power-distribution network in accordance with claim 1, wherein said power distribution network comprises a plurality of nodes, branches and laterals.
Claim 8
Dependent Claim
23 words
The closed-form method for controlling an unbalanced, power-distribution network in accordance with claim 6, wherein said power-distribution network comprises a radial network structure.
Claim 9
Dependent Claim
21 words
The closed-form method for controlling an unbalanced, power-distribution network in accordance with claim 7, wherein said power-distribution network comprises multiphase loads.
Claim 10
Dependent Claim
22 words
The closed-form method for controlling an unbalanced, power-distribution network in accordance with claim 8, wherein said power-distribution network comprises multiphase shunt elements.
Claim 11
Dependent Claim
20 words
The closed-form method for controlling an unbalanced, power-distribution network in accordance with claim 9, wherein said power-distribution network comprises transformers.
Claim 12
Dependent Claim
89 words
A closed-form method for controlling an unbalanced, power-distribution network, comprising: a) deriving a plurality of formulae, including a fundamental, explicit loss formula, for a predetermined power-distribution network; b) applying network flow programming techniques, incorporating said formulae, directly to said power-distribution network in order to determine control steps necessary to achieve optimal, steady state therefor; c) estimating the effect of said control steps on said power-distribution network prior to application thereof; and d) performing said control steps on said power-distribution network in real time so as to control operation thereof.
Claim 13
Dependent Claim
89 words
A closed-form method for controlling an unbalanced, power-distribution network, comprising: a) deriving a plurality of formulae, including a fundamental, explicit loss formula, for a predetermined power-distribution network; b) applying network flow programming techniques, incorporating said formulae, directly to said power-distribution network in order to determine control steps necessary to achieve optimal, steady state therefor; c) estimating the effect of said control steps on said power-distribution network prior to application thereof; and d) performing said control steps on said power-distribution network in real time so as to control operation thereof.
Claim 14
Dependent Claim
29 words
The closed-form method for controlling an unbalanced, power-distribution network in accordance with claim 11, wherein said formulae further comprise: a) a voltage formula; and b) a line flow formula.
Claim 15
Dependent Claim
49 words
The closed-form method for controlling an unbalanced, power-distribution network in accordance with claim 12, wherein performing said control steps comprises placing a predetermined capacitor at a predetermined position in said power-distribution network, said placement and position of said capacitor being dependent upon a solution of said explicit loss formula.
Claim 16
Dependent Claim
24 words
The closed-form method for controlling an unbalanced, power-distribution network in accordance with claim 12, wherein performing said control steps comprises reconfiguring said power-distribution network.
Claim 17
Dependent Claim
26 words
The closed-form method for controlling an unbalanced, power-distribution network in accordance with claim 13, wherein said power-distribution network comprises a plurality of nodes, branches and laterals.
Claim 18
Dependent Claim
23 words
The closed-form method for controlling an unbalanced, power-distribution network in accordance with claim 15, wherein said power-distribution network comprises a radial network structure.
Claim 19
Dependent Claim
22 words
The closed-form method for controlling an unbalanced, power-distribution network in accordance with claim 16, wherein said power distribution network comprises multiphase loads.
Claim 20
Dependent Claim
49 words
The closed-form method for controlling an unbalanced, power-distribution network in accordance with claim 17, wherein performing said control steps comprises placing a predetermined capacitor at a predetermined position in said power-distribution network, said placement and position of said capacitor being dependent upon a solution of said explicit loss formula.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-03-30 | 2001-09-29 | 2002-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-03-30 | 2005-09-29 | 2006-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-03-30 | 2009-09-29 | 2010-03-31 | $7700.00 | Window Closed / Lapsed |