Substation DC power supply system state evaluation and prediction method

The invention discloses a substation direct-current power supply system state evaluation and prediction method, and the evaluation method comprises the steps: carrying out the check discharge of a storage battery pack of a direct-current power supply system when the direct-current power supply system is out of a floating charge state; collecting a plurality of state quantities of the direct-current power supply system; each state quantity comprises a plurality of evaluation indexes; determining whether a discharge termination signal is received based on the plurality of state quantities; if a discharge termination signal is received, obtaining an initial score value of each evaluation index based on a state evaluation model; obtaining a weight coefficient of each evaluation index; and obtaining a comprehensive score value of the DC power supply system based on the initial score value and the weight coefficient of each evaluation index. The method is based on a plurality of state quantities, and the influence