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US 11,949,230 B2Granted
Hybrid power locomotive and energy balance control method and system thereof
AssigneeCrrc Zhuzhou Locomotive Co., Ltd.
InventorsHongtao Liao, Wei Wang, Qingmin Qin, Zhe Chen, Qiang Fu
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Abstract
A hybrid power locomotive and an energy balance control method and system thereof is disclosed. In embodiments of the disclosure, the energy utilization rate is maximized by means of self-adaptive matching of the rotating speed and the power, dynamic balance control over the actual output voltage of the power pack is achieved by means of charging and discharging control over the energy storage element, and energy waste and power pack overload are avoided.
Claims6
An energy balance control method fora hybrid power locomotive, wherein the energy balance control method comprises:
- step 1:
- calculating a desired value of a required power of all loads according to a required power of each load;
- step 2:
- determining an estimated output power of an energy storage element according to an available power and remaining electric quantity of the energy storage element;
- step 3:
- calculating a power required to be output by a power pack according to the desired value of the required power of all loads obtained in step 1 and the estimated output power of the energy storage element obtained in step 2;
- step 4:
- calculating a rotating speed of the power pack according to the power required to be output by the powerpack, and controlling the power pack to reach the rotating speed;
- step 5:
- determining a voltage of an intermediate DC circuit according to the rotating speed of the power pack;
- and
- step 6:
- taking the voltage of the intermediate DC circuit as a target voltage value, comparing 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, charging the energy storage element, otherwise discharging the energy storage element, so that the actual output voltage of the power pack is maintained at the target voltage value,
- wherein in step 2, 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.
17 more elements
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.
11 more elements
Dependencies are inferred from the claim text.