Simulation of Adjustable Speed Drives under non-sinusoidal waveform and Analysis of Harmonic Mitigation Techniques

Abdullahi Lanre Amoo, Jibril Mohammed, Sani Sabo Muhammad

Abstract


In power electronic systems, specifically inverters used for variable frequency drives (VFDs), controlling the harmonic content of the output waveform is crucial for enhancing system performance and reducing electromagnetic interference (EMI). Two widely used modulation techniques for controlling the harmonic content in inverter output are Selective Harmonic Elimination (SHE) and Multiple Pulse Width Modulation (Multiple PWM). To achieve some intriguing research objectives such as trade-offs between cost and circuit complexity; single Pulse width modulation, sinusoidal pulse width modulation and space vector pulse width modulation may be adopted in drive systems. In this paper, comparative studies have been carried out on Pulse Width Modulation (PWM) designed with a single pulse, multiple pulses, sinusoidal reference pulses and space vector PWM to underscore optimizing power delivery systems, preventing equipment failures, and reducing energy waste. Harmonic mitigation was also explored using selective harmonic Elimination (SHE) which offers simple mitigation technique as it effectively eliminates specific harmonics but may leave behind higher-frequency harmonics, making it less versatile in applications with more complex harmonic requirements. Multiple PWM provides a more uniform reduction in harmonic distortion across a wide frequency spectrum but may not eliminate specific low-order harmonics as precisely as SHE. Using MATLAB, this work models control systems for an Induction Motor (IM), with the potential for application to other motor types, including Permanent Magnet Synchronous Motors (PMSM) and DC motors. The results reveal the impact of power electronics on Electromagnetic Interference (EMI) and ensures compliance with IEC 61000-4-7 standards through careful design considerations, such as effective shielding and layout strategies.


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References


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