Railway engineering vehicle power battery energy feedback charging control system and method

The invention discloses an energy feedback charging control system and method for a power battery of a railway engineering vehicle, and the method comprises the following steps: S101), calculating the energy P load consumed by an auxiliary load when the railway engineering vehicle is in an electric braking working condition and operates normally; s102) judging whether the residual energy of the intermediate direct current loop is positive or not according to the P load, the wheel cycle braking energy P wheel cycle and the discharge current of the charge and discharge unit, if so, executing the step S103), and if not, skipping to the step S101) to execute; s103) calculating an allowable charging current value I1 of the electric braking energy; s104) calculating a charging current target value Itarget = min (I1, Itarget) according to the I1 in combination with a power battery allowable charging current value Itarget; and S105) controlling the charging and discharging unit to charge the power battery according t