Systems and methods for rapid disturbance detection and response
AssigneeJohnson Controls Technology Company
InventorsMatthew J. Asmus, Robert D. Turney, Justin J. Seifi
Life of this patent
Estimating the term…
Abstract
A method for detecting and responding to disturbances in a HVAC system using a noisy measurement signal and a signal filter is provided. The method includes detecting a deviation in the noisy measurement signal, resetting the filter in response to a detected deviation exceeding a noise threshold, filtering the noisy measurement signal using the signal filter to determine an estimated state value, and determining that a disturbance has occurred in response to the estimated state value crossing a disturbance threshold. In some embodiments, the method further includes performing one or more control actions in response to the detection of a disturbance.
Claims18
A method for detecting and responding to disturbances in a HVAC system using a noisy measurement signal and a signal filter, the method comprising:
- detecting a deviation in the noisy measurement signal, wherein the noisy measurement signal measures a supply line voltage of the HVAC system;
- resetting the signal filter in response to the detected deviation exceeding a noise threshold, wherein resetting the signal filter comprises increasing a covariance parameter used by the signal filter to calculate a weight assigned to a current value of the noisy measurement signal, which causes the signal filter to assign a relatively lesser weight to a previous estimate of the supply line voltage and a relatively greater weight to the current value of the noisy measurement signal, thereby increasing a responsiveness of the signal filter to changes in the noisy measurement signal;
- filtering the noisy measurement signal using the reset signal filter to determine a new estimate of the supply line voltage;
- determining whether a disturbance has occurred by comparing the new estimate of the supply line voltage to both a brownout voltage threshold and a blackout voltage threshold less than the brownout voltage threshold, wherein both the brownout voltage threshold and the blackout voltage threshold are different from the noise threshold;
- deactivating one or more active power relays in response to a determination that the new estimate of the supply line voltage is less than the blackout voltage threshold;
- and
- preventing one or more inactive power relays from activating in response to a determination that the new estimate of the supply line voltage is between the blackout voltage threshold and the brownout voltage threshold.
A system for detecting and responding to disturbances using a noisy measurement signal and a signal filter, the system comprising:
- a sensor configured to measure one or more values of a supply line voltage in an HVAC system, wherein the sensor produces a noisy measurement signal including the one or more measured values;
- and
- a processing circuit configured to:
- detect a deviation in the one or more measured values;
- reset the signal filter in response to the detected deviation exceeding a noise threshold, wherein resetting the signal filter comprises increasing a covariance parameter used by the signal filter to calculate a weight assigned to a current value of the noisy measurement signal, which causes the signal filter to assign a relatively lesser weight to a previous estimate of the supply line voltage and a relatively greater weight to the current value of the noisy measurement signal, thereby increasing a responsiveness of the signal filter to changes in the noisy measurement signal;
- filter the noisy measurement signal using the reset signal filter to determine a new estimate of the supply line voltage;
- determine whether a disturbance has occurred by comparing the new estimate of the supply line voltage to both a brownout voltage threshold and a blackout voltage threshold less than the brownout voltage threshold, wherein both the brownout voltage threshold and the blackout voltage threshold are different from the noise threshold;
- deactivate one or more active power relays in response to a determination that the new estimate of the supply line voltage is less than the blackout voltage threshold;
- and
- prevent one or more inactive power relays from activating in response to a determination that the new estimate of the supply line voltage is between the blackout voltage threshold and the brownout voltage threshold.
Dependencies are inferred from the claim text.