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Title: Modeling and control of thermostatically controlled loads

As the penetration of intermittent energy sources grows substantially, loads will be required to play an increasingly important role in compensating the fast time-scale fluctuations in generated power. Recent numerical modeling of thermostatically controlled loads (TCLs) has demonstrated that such load following is feasible, but analytical models that satisfactorily quantify the aggregate power consumption of a group of TCLs are desired to enable controller design. We develop such a model for the aggregate power response of a homogeneous population of TCLs to uniform variation of all TCL setpoints. A linearized model of the response is derived, and a linear quadratic regulator (LQR) has been designed. Using the TCL setpoint as the control input, the LQR enables aggregate power to track reference signals that exhibit step, ramp and sinusoidal variations. Although much of the work assumes a homogeneous population of TCLs with deterministic dynamics, we also propose a method for probing the dynamics of systems where load characteristics are not well known.
Authors:
 [1] ;  [1] ;  [2] ;  [2]
  1. Los Alamos National Laboratory
  2. UNIV OF MICHIGAN
Publication Date:
OSTI Identifier:
1045412
Report Number(s):
LA-UR-11-00040; LA-UR-11-40
TRN: US201215%%24
DOE Contract Number:
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: 17th Power Systems Computation Conference ; August 26, 2011 ; Stockholm, Sweden
Research Org:
Los Alamos National Laboratory (LANL)
Sponsoring Org:
DOE
Country of Publication:
United States
Language:
English
Subject:
24 POWER TRANSMISSION AND DISTRIBUTION; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; DESIGN; ENERGY SOURCES; FLUCTUATIONS; LOAD ANALYSIS; POWER SYSTEMS; SIMULATION