Harmonic Mitigation and a Practical Study of Torque Harmonics in Induction Motor Startup

In this paper, the nature of harmonics due to the operation of nonlinear power system components, the effects of harmonics and methods to eliminate the harmonics will be discussed briefly. Harmonics caused by power electronic devices and their impact on other loads in an industrial facility are a primary concern in this paper. Harmonics are the major source power quality problems for power systems. Therefore, harmonic mitigation techniques are inevitable in power systems and sometimes in the power converters themselves. This paper reviews and analyzes the main power electronic sources of harmonics in a power system and describe the available mitigation techniques. Therefore, it helps to compare the compensation methods and choose the best one based on the application. A further study can be classifying the optimized compensation method for different harmonic sources. This paper includes a case study that introduces a different approach to practically mitigate the unwanted harmonics in a 12000 hp synchronous motor that failed to start up with a soft starter.