Disclosed in the present invention is a DC-side inertia enhancement control method for an island diesel-storage hybrid power supply system, primarily comprising the two portions of virtual inertia control and voltage-current dual loop control. Virtual inertia control causes a DC side of an island diesel-storage hybrid power supply system to possess greater inertia, stabilizing voltage fluctuations in a DC bus. Proportional integral control is used in an outer voltage loop, allowing for tracking, without static error, of a voltage parameter value of an output side of a bidirectional energy storage converter, and proportional control is used in an inner current loop, improving steady-state precision in the system. By means of the present invention, control of the working state of a bidirectional energy storage converter on the basis of a sampling signal is made possible, suppressing large voltage fluctuations in a DC-side of a system, and causing the power supply system to operate smoothly.
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