Abstract
In view of the low switching frequency restriction of high-power permanent magnet synchronous motor (PMSM) drive system and longing for sensorless control in hostile conditions, a novel PWM control scheme, born out of selective harmonic mitigation pulse width modulation (SHMPWM) technique, was proposed for sensorless control of high-power PMSM. A new enhanced constraint was placed on the traditional SHMPWM nonlinear transcendental equation to selectively generate constant amount of a certain3k+1order harmonic signals while guaranteed that the undesired harmonic signals can be suppressed. At the same time, the3k+1order harmonic signals were extracted by band-pass filter, which had the constant amplitude and phase angle difference of 120°, equivalent to inject rotating voltage vector in the natural coordinate system of motor, and the rotor position can be estimated using the3k+1order harmonic signals. The nonlinear transcendental equation of the novel modulation technique had been designed, and its numerical method had been analyzed. The rotor position observer had been designed according to the3k+1order harmonic signals. Simulation results verify that the harmonic suppression of the system was implemented, and the sensorless control was efficient by the novel SHMPWM technique.
Highlights
High-power permanent magnet synchronous motor (PMSM) has a wide range of applications in electric drive system such as electric vehicle and high-speed rail due to its design philosophy of high efficiency and energy conservation [1].On the one hand, the high-power motor drive system is more technically required in many aspects than the drive system of medium and low power
In order to realize the sensorless control on the electrical machine, the constraint on (6) is enhanced and a novel selective harmonic mitigation pulse width modulation (SHMPWM) nonlinear transcendental equation is obtained so that the amplitude of a certain order harmonic is kept constant by the premise of satisfying the allowable ranges of a related standard; the constraint is as follows:
From the result of Fourier analysis, the maximum value of the harmonics as well as the THD decreases when SHMPWM is used at the working condition with a 500 Hz switching frequency and a 100 Hz operation frequency
Summary
A new enhanced constraint was placed on the traditional SHMPWM nonlinear transcendental equation to selectively generate constant amount of a certain 3k + 1 order harmonic signals while guaranteed that the undesired harmonic signals can be suppressed. The 3k + 1 order harmonic signals were extracted by band-pass filter, which had the constant amplitude and phase angle difference of 120∘, equivalent to inject rotating voltage vector in the natural coordinate system of motor, and the rotor position can be estimated using the 3k+1 order harmonic signals. The nonlinear transcendental equation of the novel modulation technique had been designed, and its numerical method had been analyzed. The rotor position observer had been designed according to the 3k + 1 order harmonic signals.
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