SmartElectricDrives

Project Description

Key Advantages

• Simulation of an entire electric drive systems including energy storages, converters (power electronics) and controls for electric machines
• Simulation of transient effects in electric drives
• Development and optimization of various control strategies
• Machines from the Modelica Standard Library can be controlled
• Additionally, quasi stationary models of different machine types are provided
• Different model complexities
• Easy to handle models

The SmartElectricDrives Library allows the simulation of hybrid electric vehicles and new alternative concepts with electrical auxiliaries. The challenge of the development process is the simulation of the overall system to develop new electric drive concepts for automotive applications. Investigation of a hybrid concept showed that an efficiency increase of 17% of the whole electric drive leads to a fuel saving of the hybrid vehicle of 13%. This example demonstrates the important role of simulation in the design and development of the electric drive train. With the SmartElectricDrives Library all components of the electric drive train, such as energy storages, power electronics, controls and electric machines can be simulated.

SmartElectricDrives Library for transient and quasi stationary applications

Machines:

• Direct current machines
• Asynchronous induction machines
• Permanent magnet synchronous machines
• Brushless DC machines

Controls:

• Voltage/Frequency control
• Field oriented control
• Speed and position control

Power electronics:

• Rectifiers (AC/DC- converters)
• Inverters (DC/AC- converters)
• DC/DC-converters
• Idealized and real converters
• PWM (Pulse With Modulation)

Energy storages:

• Batteries
• Supercaps
• Fuel cells (PEM)

Field of Applications:

• Hybrid electric vehicles (HEV) in combination with the PowerTrain library
• Starter / generator
• Electrically operated water pump
• Electrically operated oil pump
• Electrically operated air conditioning system
• Industrial drives

Example of a hybrid electric drive train

In hybrid electric vehicles, the electric traction machine has to be torque controlled. In this example an induction machine control is based on magnetic field orientation. This technique allows the fast and accurate torque generation. For the torque controller, flux has to be modelled, so that the torque and magnetic field can be controlled independently. Battery supply, the dc/ac converter and measurement equipment are also modelled in the shown example. This model of an electric drive can be implemented easily in a longitudinal dynamics simulation of a hybrid electric vehicle.