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

Abstract

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.

Inventors:

Turney, Robert D.; Wenzel, Michael J.

Issue Date:

Tue Sep 06 00:00:00 EDT 2016

Research Org.:

Johnson Controls Technology Company, Holland, MI (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1320888

Patent Number(s):

9436179

Application Number:

13/802,279

Assignee:

Johnson Controls Technology Company (Holland, MI)

Patent Classifications (CPCs):

G - PHYSICS G05 - CONTROLLING G05B - CONTROL OR REGULATING SYSTEMS IN GENERAL

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02B - CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

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G - PHYSICS G05 - CONTROLLING G05B - CONTROL OR REGULATING SYSTEMS IN GENERAL

G05B15/02 - electric
G05B19/042 - using digital processors
G05B2219/2639 - Energy management, use maximum of cheap power, keep peak load low
G05B2219/2642 - Domotique, domestic, home control, automation, smart house
G05B23/02 - Electric testing or monitoring

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02B - CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

Y02B70/30 - Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
Y02B70/3225 - Demand response systems, e.g. load shedding, peak shaving

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y04 - INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS Y04S - SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS

Y04S20/20 - End-user application control systems
Y04S20/222 - Demand response systems, e.g. load shedding, peak shaving
Y04S20/30 - Smart metering

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DOE Contract Number:  

EE0003982

Resource Type:

Patent

Resource Relation:

Patent File Date: 2013 Mar 13

Country of Publication:

United States

Language:

English

Subject:

29 ENERGY PLANNING, POLICY, AND ECONOMY; 42 ENGINEERING