Patent ID: 11949230
Assignee: CRRC ZHUZHOU LOCOMOTIVE CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 4:
5. An energy balance control system for a hybrid power locomotive, wherein the energy balance control system comprises:
a load power calculation unit, configured to calculate a desired value of a required power of all loads according to the power of each load;
an estimated output power determination unit, configured to determine an estimated output power of an energy storage element according to an available power and a remaining electric quantity of the energy storage element;
a calculation unit for calculating a power required to be output by a power pack, configured to calculate a power required to be output by a power pack according to the desired value of the required power of all loads and the estimated output power of the energy storage element;
a rotating speed calculation unit, configured to calculate a rotating speed of the power pack according to the power required to be output by the powerpack, and control the power pack to reach the rotating speed;
a voltage determination unit, configured to determine a voltage of an intermediate DC circuit according to the rotating speed of the power pack; and
a control unit, configured to take the voltage of the intermediate DC circuit as a target voltage value, compare an actual output voltage of the power pack with the target voltage value, and if the actual output voltage of the power pack is higher than the target voltage value, charge the energy storage element, otherwise discharge the energy storage element, so that the actual output voltage of the power pack is maintained at the target voltage value,
wherein when determining an estimated output power of the energy storage element, it is assumed that Estorage is the remaining electric quantity of the energy storage element, Etotal is a total electric quantity of the energy storage element, Pavailable is the available power of the energy storage element, and Pestimated is the estimated output power of the energy storage element;

when Estorage≥70%×Etotal,Pestimated=Pavailable;

when 50%×Etotal≤Estorage<70%×Etotal,Pestimate=60%×Pavailable;

when 30%×Etotal≤Estorage<50%×Etotal,Pestimated=20%×Pavailable;

when 10%×Etotal≤Estorage<30%×Etotal,Pestimated=−20%×Pavailable; and

when Estorage<10%×Etotal,Pestimated=−60%×Pavailable.