Designing and Evaluating Electric Power Train Systems: Coursework

Coursework Overview

This module has two pieces of coursework and each worth 50% of the total assessment for this module. The first coursework deals with the most important parts of the electric power train – battery storage system, electronic inverter, and electric motor. The second course work deals with the thermal management of electric powertrain systems. his coursework is focused on the most important parts of the electric power train – battery storage system, electronic inverter, and electric motor. You will be investigating, designing,testing and evaluating your powertrain system.

 

You will need to design a battery pack for an electric vehicle with input data (voltage, current, power, battery technology, etc.). Then, based on your theoretical knowledge, you have to calculate all battery pack parameters, model it with the software Multisim, and compare the analytical results obtained from calculations and numerical results from simulations.

 

The electronic inverter and motor have to be selected according to the designed battery pack parameters. Then, you have to analyse the inverter with the Fuji IGBT Simulator software, showing the losses, temperature analysis, switching frequency, etc. and suggest a hypothetical vehicle's cycle mode of operation. Next, describe all necessary safety voltage, current and power margins necessary for the inverter and the motor. Finally, analyse the results and suggest improvements leading to improved efficiency of the entire inverter-motor system.

 

1. Energy storage system ESS. Describe all necessary input parameters stating the appropriate range for electric vehicles (e.g., voltage, current, power, power density, etc.). The ESS must be based on Li-ion or Ni-based battery cells. Select and describe all necessary elements, including relevant numerical parameters and block diagrams. Describe the energy and power distribution between the main and the additional energy storage. Specify the main criteria for the necessary electronic converters.

 

2. Battery Pack Calculations, Modelling and Simulation. Calculate necessary parameters according to your input parameters (e.g., cells connected in series and strings in parallel). The parameters must be supported with their analytical equations Use the Multisim software for modelling and simulation of the designed ESS. Include a relevant analysis of your simulation, such as internal resistance. An analysis of the eternal resistance differences must be provided for a part of the battery storage. A comparison between the analytical and numerical results is required.

 

3. Design of the inverter-motor system. Describe the input parameters of the inverter and the motor: voltage, current, power, motor RPM, power factor, etc. Use ESS parameters from the previous points as input parameters for the inverter-motor system. Use catalogue data to find an appropriate motor for automotive applications (induction, synchronous permanent magnet, brushless DC, reluctance, etc.).

 

4. Inverter circuit and analysis of the thermal conditions. Show the circuit of the inverter using the Multisim software and select the necessary power switches: MOSFET or IGBT transistors or modules. Calculate the losses according to the required switching frequency and estimate the expected efficiency of the inverter. Use the Fuji IGBT Simulator software to analyse the thermal processes in the inverter in steady-state and cycle mode of operation. Analyse the dependencies between the switching frequency and power losses and switching frequency and expected temperature. Analyse different approaches for efficiency improvement, using the switching frequency, modulation techniques, transistors parameters, etc.

 

5. Introduction, Conclusion, Presentation, References. Introduce the project/problem. Summarise a conclusion and formulate objectives for future improvements. Include relevant and up-to-date references with good, clear, and consistent presentation.