Abstract
Indirect Stator-Quantities Control (ISC) combines the principle of stator flux-orientation proven successful in Direct Self Control (DSC) with Pulse Width Modulation (PWM). High torque dynamics and robust behavior against input voltage disturbance are achieved in the whole operation range including field-weakening. After careful correction of inverter voltage errors the difference of the stator current space vectors in the machine and in the control model is employed for speed estimation, allowing dispensing with speed sensors. A special flux management allows an infinitely slow change between driving and braking.
Highlights
In the 1980’s Vector Control of Induction Machine,successful with industrial drives, already was introduced in traction[1]. It impresses the components of the stator current space vector in orientation to the rotor flux space vector by means of control
With a sufficient ratio of switching to stator base frequency sinusoidal Pulse Width Modulation (PWM) can be used without any drawback, making the traction drive easier to adapt to severe line harmonics limitations
For high power traction drives the limitation of output voltage by sinusoidal PWM to less than 90 % of the maximum possible value of the fundamental at square-wave modulation is disadvantageous as the break-down torque at high speed will be limited to less than 80 %
Summary
In the 1980’s Vector Control of Induction Machine,successful with industrial drives, already was introduced in traction[1] It impresses the components of the stator current space vector in orientation to the rotor flux space vector by means of control. With a sufficient ratio of switching to stator base frequency sinusoidal PWM can be used without any drawback, making the traction drive easier to adapt to severe line harmonics limitations. It was already employed with DSC-controlled GTO inverters in the starting region [4] where DSC shows some complications [1]. It is well known from the synchronous machine theory, and it will be taken to illustrate the basic idea of torque control
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