| Abstract |
This paper proposes a new approach to control the main currents of a three-phase high
power voltage source inverter (3ö-VSI) working as a reactive power compensator. Based on the direct
sliding mode approach (DSMC) presented in [1], this controller directly provides the inverter’s
switching configuration without the need of an intermediate look-up table or a PWM pattern generator.
In that previous result, the inherent problem of high-switching frequency was tackled by using an
hysteresis band. As it was pointed out, a drawback of that approach is that there is no a direct
expression between the switching frequency and the hysteresis band and, in steady-state, a chaotictype
behavior is observed due to the implementation of the control law. Borrowing some ideas of the
space vector modulation technique (SVM), in this paper a novel DSMC working at a fixed switching
frequency is proposed. Moreover, this approach produces, in steady state, well defined pseudo-limit
cycles. Computer simulations are presented to confirm the effectiveness of the proposed control
strategy. |
