Development of a high power inverter for electric cars

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Dr. Balogh Attila
Department of Automation and Applied Informatics

Nowadays, electromobility is getting more and more important, which is the partial or full electrification of the automobiles, replacing the power of the internal combustion engine. The positive effects of this process can be measured at the reduced fuel consumption, and the implied reduction of pollution emission. With the help of the electrical drive and the connected energy storage we are able to utilise energies, that would otherwise be lost in the system. Such example is the regeneration of electrical energy at braking, and the electrical assisted acceleration which means that an internal combustion engine with a reduced peak power output can be used. We distinguish multiple levels of hybridisation, depending on the pure electrical range of the vehicle and the raw electrical power output of the system, the purely electrical-driven vehicles are called Battery Electric Vehicles (BEV).

During this work, I developed the motor controller for a 50kW peak power output battery-electric car, which includes the power inverter, the low-voltage control circuits and the required housing and cooling. A reduced power version of the motor controller was built to validate the control software and to conduct initial measurements. I will write in detail about the control software, which accepts inputs on a standard CAN-bus interface, and sets the desired torque using a novel Space-Vector-Modulation control algorithm.

In this work I will write in detail about the sizing of the battery pack and the power inverter. The aim was to achieve maximal efficiency both for the subcomponents and also to the whole system itself.


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