Building control system with decoupler for independent control of interacting feedback loops

A method of controlling a first control loop and a second control loop that interacts with the first control loop, the method comprising:

• receiving, by a decoupler comprising a first integrator and a second integrator, a first set point, a second set point, a first feedback signal, and a second feedback signal;
• generating, by the first integrator, a first integrated decoupling error signal by integrating a first decoupling error signal, the first decoupling error signal based on the first set point and the first feedback signal;
• generating, by the second integrator, a second integrated decoupling error signal by integrating a second decoupling error signal, the second decoupling error signal based on the second set point and the second feedback signal;
• predicting a first effect of a first control signal on the second control loop;
• predicting a second effect of a second control signal on the first control loop;
• and
• generating, by the decoupler, a first modified set point and a second modified set point based on the first integrated decoupling error signal, the second integrated decoupling error signal, the first feedback signal, and the second feedback signal to reduce the first predicted effect and the second predicted effect, the first control loop controlled according to the first modified set point, the second control loop controlled according to the second modified set point.

A system for correcting interactions between a pair of heating, ventilation, and air conditioning (HVAC) controllers, comprising:

• at least one sensor serving each of the pair of HVAC controllers;
• and
• a controller using original set points and feedback from the at least one sensor to serve as a decoupler, the controller comprising a processing circuit configured to send corrected set points to each of the pair of HVAC controllers, the processing circuit comprising:
• two integrators that each provide an integrated decoupling error signal based on the original set points and the feedback from the at least one sensor, and
• a decoupling matrix network that generates the corrected set points based on each integrated decoupling error signal such that an integral control action is performed by the processing circuit at the two integrators before correcting the interactions at the decoupling matrix network.