VSS control of unity power factor
Jezernik, K.
Industrial Electronics, IEEE Transactions on
Volume 46, Issue 2, Apr 1999 Page(s):325 - 332
Digital Object Identifier 10.1109/41.753771
Summary:Three-phase pulsewidth modulation (PWM) converters, specifically,
voltage-source inverters (VSI), are possibly the most frequently used
power converters for applications such as industrial motor control,
robotics, air conditioning and ventilation, uninterruptible power
supplies, electric vehicles, etc. With the introduction of standards on
limiting harmonic pollution of electrical power distribution systems,
three-phase PWM converters are being considered as prime candidates for
interfacing high-power electronic equipment to power supply lines. In
these applications, converters can provide input currents without
distortion and with unity power factor. In this paper, the idea of using
variable-structure system (VSS) control strategy of a boost rectifier in
sliding mode is described. A new discrete-time control algorithm has
been developed by combining VSS and Lyapunov design. It possesses all
the good properties of the sliding mode and avoids the unnecessary
discontinuity of the central input, thus eliminating chattering, which
has been considered a serious obstacle to applications of VSS. A unified
control approach for output DC voltage and input AC currents based on
discrete-time sliding mode is developed. The reference tracking
performance is demonstrated in terms of transient and steady-state
characteristics by simulation and experimental results. The invariance
and the robustness features of the proposed control method are verified
by experiment in the presence of large uncertainty in parameters and
external perturbations
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