Method and system for rapidly detecting state of train entering non-power area and related components

The invention discloses a method, a system and a device for rapidly detecting a state of a train entering a non-power area, and a readable storage medium. The method comprises the steps: continuously obtaining a power grid voltage according to a sampling period, and judging whether an abnormal frequency that the change rate of the power grid voltage in a first time window exceeds a first change rate exceeds a first frequency or not; if so, acquiring running power of the train, and judging whether the train is in a light-load working condition or not according to the running power; if so, carrying out pulse blocking on a four-quadrant converter of the train; and acquiring electrical parameters of the connecting end of the four-quadrant converter and a contact network, and judging whether the train enters the non-power-area state or not according to the electrical parameters. According to the invention, the characteristic that pulse blocking of the four-quadrant converter under the light-load working condition