Within the project a solution-oriented approach will be investigated which essentially consists on the utilization of known model-based techniques and methods for condition monitoring, failure diagnosis and fault-tolerant control of electrical drives. Therefore, for the chosen electrical traction drive system especially the specific characteristics of the electrical machine (e.g. non-linear magnetisation behaviour, high power density or rather highly integrated drive structure, temperature dependency, etc.) and the inverter (non-linear characteristics, temperature dependency, etc.) have to be considered within the modelling process. As a result of the investigations a uniform concept for a supervisory monitoring and management control level shall be developed, validated on the test bench and critically evaluated regarding the requirements specified in advance. Therefore, during the ongoing operation the current process state must be determined, failure diagnosis functions must be executed and appropriate measures, in case of a detected malfunction within the system, must be self-acting initiated. Suitable reactions could be e.g. the switchover from a faulty sensor signal to an equivalent observer signal, if need the reconfiguration of the control approach, etc.
In Fig. 1 the current state-of-the-art for configuration of an induction motor drive system is illustrated and Fig. 2 shows the target structure which shall be realized within the project period.
Responsibilities of LEA within the project
The work group LEA is responsible for the following tasks:
- Analysis of the overall system with methods of the probabilistic safety analysis (PSA)
- Design of a uniform condition monitoring, failure diagnosis and management concepts
- Development of the software modules
- Verification of the developed methods