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Title: Systems and methods for energy cost optimization in a building system

Methods and systems to minimize energy cost in response to time-varying energy prices are presented for a variety of different pricing scenarios. A cascaded model predictive control system is disclosed comprising an inner controller and an outer controller. The inner controller controls power use using a derivative of a temperature setpoint and the outer controller controls temperature via a power setpoint or power deferral. An optimization procedure is used to minimize a cost function within a time horizon subject to temperature constraints, equality constraints, and demand charge constraints. Equality constraints are formulated using system model information and system state information whereas demand charge constraints are formulated using system state information and pricing information. A masking procedure is used to invalidate demand charge constraints for inactive pricing periods including peak, partial-peak, off-peak, critical-peak, and real-time.
Authors:
;
Publication Date:
OSTI Identifier:
1320888
Report Number(s):
9,436,179
13/802,279
DOE Contract Number:
EE0003982
Resource Type:
Patent
Resource Relation:
Patent File Date: 2013 Mar 13
Research Org:
Johnson Controls Technology Company, Holland, MI (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
29 ENERGY PLANNING, POLICY, AND ECONOMY; 42 ENGINEERING