State-of-charge-based power distribution method for hybrid electric propulsion system of double-electric ship

• Main Authors: HU WANGBAO, WEN YUANQUAN, GUO HAOHAO, ZHANG QINJIN, LIU YANCHENG, ZHANG HANWEN, WANG HONGLAI
• Format: Patent
• Language: Chinese; English
• Published: 06.08.2021
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; MARINE PROPULSION OR STEERING; PERFORMING OPERATIONS; RELATED EQUIPMENT; SHIPS OR OTHER WATERBORNE VESSELS; SYSTEMS FOR STORING ELECTRIC ENERGY; TRANSPORTING

The invention provides a state-of-charge-based power distribution method for a hybrid electric propulsion system of a double-electric ship. The method comprises the steps of constructing adaptive virtual impedance according to the state of charge of a power supply unit (storage battery/super capacitor), introducing the adaptive virtual impedance into a control loop of a power supply unit converter, and adjusting the output current of the power supply unit converter in real time. Therefore, power distribution among the same type of power supply units is changed, and charge state balance among the same type of power supply units is realized. According to the method, power distribution is realized based on the own charge state of the power supply unit, over-discharge of the power supply unit is avoided, and the system stability is improved; an adjustment factor for adjusting the equalization speed is set in the constructed adaptive virtual impedance, and the parameter can be flexibly selected according to the sp