Intelligent energy-saving frequency conversion control method and system for central air conditioner and storage medium

The invention discloses an intelligent energy-saving frequency conversion control method and system for a central air conditioner and a storage medium, and relates to the field of energy-saving optimization control of the central air conditioner. The intelligent energy-saving frequency conversion control method comprises the steps that a temperature and frequency estimation time model is established, and a temperature maintaining lowest frequency model is established; obtaining a central air-conditioning control instruction, and judging whether the central air-conditioning is refrigerating or heating; if the central air conditioner refrigerates, the central air conditioner operates at the lowest central air conditioner refrigeration frequency I, operates at the lowest central air conditioner refrigeration frequency II, cools to the target refrigeration temperature, operates at the lowest central air conditioner refrigeration frequency III, and maintains the target refrigeration temperature; if the central air