Systems and methods for controlling energy use in a building management system using energy budgets
AssigneeJohnson Controls Technology Company
InventorsMichael J. Wenzel, Kirk H. Drees
Life of this patent
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Abstract
Systems and methods for limiting power consumption by a heating, ventilation, and air conditioning (HVAC) subsystem of a building are shown and described. A feedback controller is used to generate a manipulated variable based on an energy use setpoint and a measured energy use. The manipulated variable may be used for adjusting the operation of an HVAC device.
Claims20
A method for controlling power consumption by an HVAC system of a building, comprising:
- using an energy use setpoint as a reference input for a feedback controller;
- using a measured energy use as a measured input for the feedback controller;
- using the feedback controller to generate a manipulated variable output for adjusting the operation of an HVAC device;
- and
- calculating the energy use setpoint using a zone temperature threshold value and a history of building zone temperatures from a previous demand limiting period, wherein the energy use setpoint is estimated to cause the highest building zone temperature at the end of a demand limiting period to be less than or equal to the zone temperature threshold value.
A method for controlling power consumption by an HVAC system of a building, comprising:
- using an energy use setpoint as a reference input for a feedback controller;
- using a measured energy use as a measured input for the feedback controller;
- using the feedback controller to generate a manipulated variable output for adjusting the operation of an HVAC device;
- and
- calculating the energy use setpoint by using a cost function that minimizes the financial cost of electrical power;
- wherein the cost function comprises a probability that a particular energy use setpoint will cause the highest building zone temperature at the end of a demand limiting period to be less than or equal to a zone temperature threshold value and a financial cost associated with the probability.
A feedback controller for controlling power consumption by an HVAC system of a building, the controller comprising:
- a processing circuit configured to generate a value of a manipulated variable for adjusting the operation of an HVAC device, wherein the processing circuit comprises:
- an error analyzer configured to receive an energy use setpoint as a reference input and to receive a measured energy use as a measured input, wherein the error analyzer is further configured to compare the reference input and the measured input, and to use the comparison to determine an error value;
- an error corrector configured to receive the error value and to use the error value to generate the value of the manipulated variable;
- and
- an energy use setpoint generator configured to calculate the energy use setpoint by using a cost function that minimizes the financial cost of electrical power used by the HVAC system, wherein the cost function comprises a probability that a particular energy use setpoint will cause the highest building zone temperature at the end of a demand limiting period to be less than or equal to a zone temperature threshold value and a financial cost associated with the probability.
A feedback controller for controlling power consumption by an HVAC system of a building, the controller comprising:
- a processing circuit configured to generate a value of a manipulated variable for adjusting the operation of an HVAC device, wherein the processing circuit comprises:
- an error analyzer configured to receive an energy use setpoint as a reference input and to receive a measured energy use as a measured input, wherein the error analyzer is further configured to compare the reference input and the measured input, and to use the comparison to determine an error value;
- an error corrector configured to receive the error value and to use the error value to generate the value of the manipulated variable;
- and
- an energy use setpoint generator configured to calculate the energy use setpoint using a zone temperature threshold value and a history of building zone temperatures from a previous demand limiting period, wherein the energy use setpoint is estimated to cause the highest building zone temperature at the end of a demand limiting period to be less than or equal to the zone temperature threshold value.
Dependencies are inferred from the claim text.