Electric vehicle driving and charging system with fault tolerance and fault reconstruction method

Abstract

The invention discloses an electric vehicle driving and charging system with fault tolerance and a fault reconstruction method. The system comprises a vehicle battery, a dual three-phase converter, an open winding motor, fault-tolerant switches, and charging switches. The vehicle battery is connected to the DC side of the dual three-phase converter. The open winding motor is of a split winding structure. The center point of each phase of winding is connected to the corresponding charging switch. The fault-tolerant switches are connected to the two ends of the corresponding phase of winding of the open winding motor. During normal operation, the vehicle battery controls the open winding motor through the dual three-phase converter to realize a driving function. Three-phase AC power is reversely fed by the dual three-phase converter to charge the battery through the charging switches and the open winding motor of a split winding structure. In the fault-tolerant operation process, after an open-circuit fault of one or two phases of bridge arms of the dual three-phase converter, the corresponding fault-tolerant switches reconfigure the topology of the dual three-phase converter. Through corresponding driving and charging control, the functions of driving and charging after system fault tolerance are realized.

Description

technical field [0001] The invention relates to an electric vehicle driving and fast charging integrated system with fault tolerance capability, which belongs to the field of motor system and control. Background technique [0002] As an important way to solve the environmental pollution and energy crisis in the transportation field, electric vehicles have attracted more and more attention from the global field. In today's increasingly mature technology of the automobile industry, the key constraints for the popularization and promotion of electric vehicles are batteries and their charging technologies. Technology becomes the key to the range and cost of electric vehicles. At present, there are two main battery charging methods for electric vehicles. One is a vehicle-mounted slow charging device. The battery charging device is placed on the electric vehicle, which can use ordinary single-phase AC power or be placed in public buildings (public buildings, shopping malls, public...

AI Technical Summary

Problems solved by technology

At present, there are two main battery charging methods for electric vehicles. One is a vehicle-mounted slow charging device. The battery charging device is placed on the electric vehicle, which can use ordinary single-phase AC power or be placed in public buildings (public buildings, shopping malls, public parking lots) etc.) and the charging socket or charging pile in the parking lot of the residential area, which has the advantage of convenient charging, but the problem with this slow charging device is that the charging power is relatively small, and it takes a long time to fully charge the vehicle battery, which affects the electric The utilization rate of the car, and the on-board charger is an inherent load during the driving of the electric car, which affects the improvement of the vehicle's operating performance; another fast charging pile to solve the charging speed of the slow charging device is usually arranged in a dedicated charging station , the industrial three-phase AC power is converted into high-power DC power through a high-power converter, and the on-board battery can be charged directly, which can quickly complete the charging of the battery in a short time, and can effectively improve the charging efficiency and utilization of electric vehicles. However, the fast charging Due to the large power, volume and weight of the device, the installation on electric vehicles seriously occupies the limited space and weight resources of electric vehicles. In the process of promoting the application of electric vehicles, it is necessary to assist in the establishment of supporting fast charging stations. Sexuality and other aspects are also subject to great restrictions

In US9018809B2, on the basis of the open-winding motor structure, the dual-three-phase converter can not only realize the driving function of the open-winding motor, but also connect the three-phase AC power grid to the three-phase winding of the motor through a switch in the charging state, and connect the winding of the motor Equivalent to the input filter inductance of three-phase PWM rectification, the three-phase converter works in PWM rectification mode to quickly realize the charging function of the battery. The problem of driving the motor output torque and vibration shock during the charging process requires adding an additional motor rotor locking device, or taking out the motor rotor during charging

However, the above-mentioned open-winding motor drive and charging integration scheme still has the fault problem of the converter or motor winding. The existing fault-tolerant technology of the open-winding motor system is still based on its basic small voltage vector output characteristics and maintains the system after the fault. The basic output performance, compared with the operating speed range and torque output capacity of the system before the fault tolerance, is limited to a certain extent. Therefore, how to retain the output capacity of the open-winding motor system after the fault-tolerant scheme is to further improve the open-winding motor system. The key to the reliability of the system is also an important way to improve the performance of the electric vehicle system based on the open-winding motor system

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