Analysis of Vienna rectifier

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Grzegorz Radomski

It is common to find the inexpensive but robust electric power rectification method to fulfil the demands of clean power conversion. The Vienna rectifier structure is one of the hopeful construction to fulfil these demands. It may be classified as the Clean Power Converter. It lets us obtain PFC rectification in simpler than the PWM converter system. The Vienna rectifier has three control points. In addition the Vienna rectifier is the three voltage level system with less current ripples than in the case of the PWM converter. However, it has some disadvantages. The Vienna rectifier system is an unidirectional converter.

It can function only in the rectifier mode, the working in the inverter mode is impossible and the generation of the reactive power is strongly restricted. Usually the Vienna rectifier is controlled on the basis of the direct current control method. However, this method is not perfect because it lets the improper control sequences appear. In this paper the mathematical model of the Vienna rectifier is derived. The voltage space vectors and their dependencies to the phase currents are defined. The range of the phase displacement angle and the maximum voltage space vector module v. phase displacement angle is drawn out for the case of the sinusoidal space vector modulation. The drawn out relations are proven by simulation results.

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