Active filter fault diagnosis and active fault-tolerant control method and system and storage medium

The invention discloses an active filter fault diagnosis and active fault-tolerant control method and system and a storage medium, and relates to the field of active filter fault diagnosis. The method comprises the following steps: collecting power signal parameters in the active filter, wherein the power signal parameters comprise a current signal, a harmonic reference signal and a feedback harmonic component for connecting the active filter to an on-line circuit; comprehensively analyzing the power signal parameters, screening fault data in the active filter or the power system, and establishing topological structure data of the power system and the active filter; performing real-time monitoring on the topological structure data of the power grid by using distributed harmonic analysis, and determining whether the active filter has a fault according to a real-time monitoring result; and if the active filter has a fault, transmitting a fault result to a cloud database for comparison, and formulating an active