Systems and methods for controlling energy use in a building management system using energy budgets
DCFirst Claim
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1. 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.
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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.
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Citations
20 Claims
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1. A method for controlling power consumption by an HVAC system of a building, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for controlling power consumption by an HVAC system of a building, comprising:
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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. - View Dependent Claims (10, 11)
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12. A feedback controller for controlling power consumption by an HVAC system of a building, the controller comprising:
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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. - View Dependent Claims (19, 20)
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13. A feedback controller for controlling power consumption by an HVAC system of a building, the controller comprising:
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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. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification