Electric coupling control method of double-source trackless trolley bus and power device

Abstract

The invention relates to an electric coupling control method of a double-source trackless trolley bus and a power device. The required power of a vehicle is divided into a high frequency part and a low frequency part by utilizing a wavelet transformation power dividing strategy, the advantage of a super capacitor for supplying instantaneous high current and high frequency power is fully utilized,the high frequency part of the required power of the vehicle is supplied by the super capacitor, the low frequency part of the required power of the vehicle is supplied by a power battery or a power supply wire mesh, and the super capacitor is charged firstly by utilizing the characteristics of the super capacitor in a braking process. In the whole system, the energy of the high frequency part, which can not be adaptively supplied by the power battery, is supplied by the super capacitor; simultaneously, in an online working mode, the power supply wire mesh can adjust energy distribution in real time according to actual running conditions and the charge states of the power battery and the super capacitor, thereby supplying energy required for vehicle running and charging the power battery and the super capacitor; and in an offline working mode, the power battery and the super capacitor cooperatively work, thereby supplying the power required for vehicle running.

Description

technical field [0001] The invention relates to a dual-source trolleybus electric coupling control method and a power device, in particular to an electric vehicle electric coupling control method and a power device using a power battery, a super capacitor and a power supply network as energy sources. technical background [0002] The current common electric vehicle power system has the following problems: [0003] (1) The braking energy recovery effect is not good [0004] Reason: Traditional electric vehicles only have the power battery as the on-board energy source. When braking and recovering energy, due to the limitation of the charging power and charging current of the power battery, the charging power and charging current during braking and recovery are often limited to a specific Level, the power and current of the brake generator motor are limited, and a considerable part of the brake energy is wasted because it does not meet the charging requirements of the power b...

AI Technical Summary

Problems solved by technology

[0003] (1) The braking energy recovery effect is not good

[0004] Reason: Traditional electric vehicles only have the power battery as the on-board energy source. When braking and recovering energy, due to the limitation of the charging power and charging current of the power battery, the charging power and charging current during braking and recovery are often limited to a specific Level, the generating power and generating current of the brake generator motor are limited, and a considerable part of the braking energy is wasted because it does not meet the charging demand of the power battery, thereby reducing the energy recovery rate

[0005] (2) The energy supply system is difficult to meet the driving demand

[0006] Reason: Traditional electric vehicles only have power batteries to provide energy. The demand for power during driving is instantaneous, that is, the battery needs to be discharged with a large current in a short period of time. In order to ensure the safety and service life of the power battery, the discharge of the battery The current is often limited within a certain range, which is difficult to meet the driving needs of the car

At the same time, due to the limited energy stored in the battery, this limits the mileage of the car

[0007] (3) The service life of the power battery is short

[0008] Reason: Traditional electric vehicles only have power batteries to provide energy, and the various working conditions of the car often change during driving. The power supply and current are also changing at a high frequency, and they are often switched between charging and discharging states, while the power battery is a chemical energy storage element, and the high-frequency changes in the working state of the battery make the electrochemical reaction of the battery itself reverse and positive. Switching to the two states of reaction will eventually lead to a greatly shortened life of the battery itself

Images