1. Analytic Overmodulation Method and Application to IPMSM Current Control
- Author
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Kwanghee Nam, Seungmin Hong, Jaehong Kim, and Heekwang Lee
- Subjects
Computer science ,020208 electrical & electronic engineering ,Modulation index ,Linearity ,02 engineering and technology ,Function (mathematics) ,symbols.namesake ,Dwell time ,Control theory ,Fourier analysis ,0202 electrical engineering, electronic engineering, information engineering ,symbols ,Overmodulation ,Voltage - Abstract
An overmodulation (OVM) technique is proposed based on Fourier analysis. The OVM trajectory is a mixture of 6 arc segments of the inscribed circle and 6 vertices of the voltage hexagon. By adjusting the dwell time at each vertex, the modulation index is determined. The fundamental component is expressed as a function of the dwell time, and the linearity with the modulation index is obtained by the inverse relation. This algorithm guarantees seamless transitions from the space vector PWM (SVPWM) to OVM and finally to the six-step. Apart from the VVVF control, the proposed algorithm works well with the interior permanent magnet synchronous motor (IPMSM) current controller. By computer simulation and experimental evidences, the effectiveness is demonstrated.
- Published
- 2018
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