On-board capacitor health monitoring systems and methods

A system for monitoring DC link capacitor health for use with a power conversion system, comprising:

• a controller;
• and
• a tangible, non-transitory memory configured to communicate with the controller, the tangible, non-transitory memory having instructions stored thereon that, in response to execution by the processor, cause the controller to perform operations comprising:
• receiving, by the controller, a plurality of first DC link capacitor state variables;
• determining, by the controller, whether each of the first DC link capacitor state variables is less than a first threshold value;
• calculating, by the controller, a deviation of each of the first DC link capacitor state variables from the first threshold value, in response to the first DC link capacitor state variable being less than the first threshold value;
• determining, by the controller, whether each of the deviations of the first DC link capacitor state variables occurred within a first threshold time;
• and
• calculating, by the controller, a first probability of failure of the DC link capacitor by dividing a total number of the deviations of the first DC link capacitor state variables that occurred within the first threshold time by a total number of the plurality of first DC link capacitor values.

A power conversion system, comprising:

• a DC link capacitor;
• a controller configured to monitor a plurality of DC link capacitor state variables;
• and
• a tangible, non-transitory memory configured to communicate with the controller, the tangible, non-transitory memory having instructions stored thereon that, in response to execution by the processor, cause the controller to perform operations comprising:
• receiving, by the controller, a plurality of first DC link capacitor state variables;
• determining, by the controller, whether each of the first DC link capacitor state variables is less than a first threshold value;
• calculating, by the controller, a deviation of each of the first DC link capacitor state variables from the first threshold value, in response to the first DC link capacitor state variable being less than the first threshold value;
• determining, by the controller, whether each of the deviations of the first DC link capacitor state variables occurred within a first threshold time;
• and
• calculating, by the controller, a first probability of failure of a DC link capacitor by dividing a total number of the deviations of the first DC link capacitor state variables that occurred within the first threshold time by a total number of the plurality of first DC link capacitor values.