skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Adaptive protection algorithm and system

Abstract

An adaptive protection algorithm and system for protecting electrical distribution systems traces the flow of power through a distribution system, assigns a value (or rank) to each circuit breaker in the system and then determines the appropriate trip set points based on the assigned rank.

Inventors:
 [1];  [2];  [3]
  1. Pittsburgh, PA
  2. Irwin, PA
  3. Mars, PA
Publication Date:
Research Org.:
Bettis Atomic Power Laboratory (BAPL), West Mifflin, PA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
963795
Patent Number(s):
7,525,782
Application Number:
11/094,268
Assignee:
The United States of America as represented by the United States Department of Energy (Washington, DC) PNRO
DOE Contract Number:
AC11-98PN38206
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
24 POWER TRANSMISSION AND DISTRIBUTION

Citation Formats

Hedrick, Paul, Toms, Helen L, and Miller, Roger M. Adaptive protection algorithm and system. United States: N. p., 2009. Web.
Hedrick, Paul, Toms, Helen L, & Miller, Roger M. Adaptive protection algorithm and system. United States.
Hedrick, Paul, Toms, Helen L, and Miller, Roger M. Tue . "Adaptive protection algorithm and system". United States. doi:. https://www.osti.gov/servlets/purl/963795.
@article{osti_963795,
title = {Adaptive protection algorithm and system},
author = {Hedrick, Paul and Toms, Helen L and Miller, Roger M},
abstractNote = {An adaptive protection algorithm and system for protecting electrical distribution systems traces the flow of power through a distribution system, assigns a value (or rank) to each circuit breaker in the system and then determines the appropriate trip set points based on the assigned rank.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Apr 28 00:00:00 EDT 2009},
month = {Tue Apr 28 00:00:00 EDT 2009}
}

Patent:

Save / Share:
  • This patent describes an adaptive load regulator for a linear alternator driven by a free piston Stirling engine, having a heat energy source, the alternator having an armature circuit and a useful load connected to the armature circuit, and further including a stepped armature system for controlling the stroke amplitude of the Stirling engine. The regulator and the stepped armature system comprise: (a) a controllably variable conductance shunted across the armature; (b) a negative feedback control circuit comprising: (i) a summing circuit; (ii) a voltage detector means connected to the armature circuit for detecting a signal which is proportional tomore » the alternator output voltage and connected to apply the detected signal to an input of the summing circuit; (iii) a reference signal source connected to apply its reference signal to another input of the summing circuit; and (iv) an amplifier having its input connected to the output of the summing circuit and its output connected to the control input of the controllable, variable conductance for applying a signal which is proportional to the difference of the input signals at the summing circuit to a control input of the variable conductance for varying the conductance in proportion to detected voltage changes; (c) an armature coil divided into a plurality of coils serially connected by one or more taps; (d) circuit means having an input connected to the useful load for detecting the steady state output power demand of the useful load and (e) logic switching means.« less
  • A method is described of controlling air/fuel ratio perturbation in response to purging of fuel vapors from a vapor canister storing fuel vapors from the fuel tank of an internal combustion engine. The method comprises: generating a base fuel command; actuating purging of the fuel vapors; and feeding forward an offsetting fuel command signal to modify the base fuel command signal whenever fuel vapor purging is occurring in order to compensate for the fuel and air that enter the engine via the purge line thereby reducing air/fuel ratio perturbations.
  • A method is described for selectively providing a low heat mode and a high heat mode of a heating cycle in a furnace as a function of a previous heating cycle, comprising the steps of: storing a previous time period of operation of a low heat mode and a previous time period of operation of a high heat mode of a previous heating cycle; determining the existence of a heating load to be satisfied, recalling the stored time period of the previous high heat mode, providing a low heat mode for a selected first time period dependent upon the storedmore » time period of the previous high heat mode, and terminating the low heat mode if the heating load is satisfied during the selected first time period.« less
  • A control system for regulating a controlled device or process, such as a turbofan engine, produces independent multiple estimates of one or more controlled variables of the device or process by combining the signals from a plurality of feedback sensors, which provide information related to the controlled variables, in weighted nonordered pairs. The independent multiple estimates of each controlled variable are combined into a weighted average, and individual estimates which differ by more than a specified amount from the weighted average are edited and temporarily removed from consideration. A revised weighted average value of each controlled variable is then produced,more » and this value is used to limit or control operation of the device or process. Adaptive trim is provided to compensate for changes in the device or process being controlled, such as engine deterioration, by slowly trimming each individual estimate toward the mean, and includes error compensation which constrains the weighted sum of the adaptive trims to equal zero, thereby preventing the adaptive trim from changing the operating level of the device or process. A secondary editing circuit based on a majority rule principle identifies a failed feedback sensor and permanently excludes all individual estimates of the controlled variable based on the failed sensor. Editing boundaries are increased and adaptive trim rate is varied when a transient occurs in the operation of the device or process. Further transient compensation may be required for a system with more severe transient requirements, and this invention includes compensation to selected feedback parameters such as turbine temperature to account for differences between steady state and transient values.« less
  • A regenerative and friction braking system for a vehicle having one or more roadwheels driven by an electric traction motor includes a driver responsive device for producing a brake demand signal having a magnitude corresponding to the level of braking force selected by the driver and friction and regenerative brakes operatively connected with the roadwheels of the vehicle. A system according to this invention further includes control means for operating the friction and regenerative braking subsystems so that maximum brake torques sustainable by the roadwheels of the vehicle without skidding or slipping will not be exceeded.