Building management system with self-optimizing control, performance monitoring, and fault detection

A method of operating building equipment, comprising:

• operating building equipment in accordance with an input to alter a variable state or condition of a building;
• generating the input as a function of a measured state of the building equipment;
• providing the input to the building equipment;
• obtaining and storing a dataset comprising the measured state of the building equipment and the input for a plurality of time steps;
• determining, based on at least a portion of the dataset, a self-optimizing control function that defines a self-optimizing control variable as a function of the measured state of the building equipment;
• calculating a value of the self-optimizing control variable using the self-optimizing control function and the measured state;
• monitoring the value of the self-optimizing control variable over time;
• and
• generating an indication of performance of the building equipment relative to optimal performance based on the value of the self-optimizing control variable.

One or more non-transitory computer-readable media containing program instructions that, when executed by one or more processors, cause the one or more processors to perform operations comprising:

• obtaining a dataset comprising a measured state of building equipment for a plurality of time steps and an input to the building equipment for the plurality of time steps, the building equipment configured to operate as controlled by the input;
• determining, based on at least a portion of the dataset, a self-optimizing control function that defines a self-optimizing control variable as a function of the measured state of the building equipment;
• obtaining a current value of the measured state of the building equipment;
• calculating a value of the self-optimizing control variable using the function and the current value of the measured state;
• generating an indication of performance of the building equipment relative to optimal performance based on the value of the self-optimizing control variable;
• and
• one or more of:
• modifying an operation of the building equipment in response to the indication;
• or
• generating a graphical representation of the indication and causing the graphical representation to be displayed by a user device.