DSP Based Experimental Validation Technique Applied to the Development of a New Vienna Rectifier Small Signal Model

Abstract

In this paper, a new small signal model is theoretically established and validated by both simulation and experiments for a three-phase three-level boost-type AC/DC Vienna converter. The adopted identification methodology consists of three steps: first, the converter steady state and dynamic models are derived from the nonlinear state space equations, initially expressed in the dqo synchronous reference frame, by means of a local linearization around the nominal operating point, thus yielding twenty transfer functions relating the inputs to the outputs of the system. The second step is the numerical verification using both the averaged state space model built in SIMULINK, and the converter circuit simulation using SPS of Matlab. Finally, an experimental validation of the transfer functions on a 1.5 kW laboratory prototype, supported by the DS 1104 real-time controller board of dSPACE is carried out. The results are quantified and compared as magnitude and phase Bode graphs. It is confirmed that the proposed new small signal model represents rather accurately the real plant and is, therefore, reliable for further tasks such as dynamic analysis, numerical simulation and controller design purposes.

ZVS/ZCS Vienna rectifier topology for high power applications

“…I Q (stress) = I s (38) where V p represents the snubber capacitor peak voltage and I s is the input source current. The boost diodes peak voltage and current stresses are given as follows:…”

“…In recent years, a topology is getting more attention in high power front-end applications due to its attractive inherent characteristics such as high power factor, low switch count, and reduced switch voltage stresses [19,20,37]. This topology recognised as vienna rectifier, exists in the market since 1992 [38] and is in use largely in industries such as welding power supplies, battery chargers for telecommunication, electric vehicles, wind turbines, and aviation systems [21,33,39,40,[41][42][43][44][45]. The losses associated with high switching frequency have resulted to prohibit its use on large-scale as compare to its counterparts.…”