Space vector modulated four-wire unidirectional three-phase/level/switch (VIENNA) rectifier with an additional leg for DC link voltage balancing

Discrete-time one cycle control of VIENNA rectifiers considering the dc-link neutral-point voltage balance

“…In case of the supply side neutral connection absence (For example, the power supply system of ships and airplane is the three-phase threewire system [8]), the following two approaches may be taken into account. The first is using a conventional two-level rectifier to create a DC link and adding a DC-DC converter (typically realized by an additional leg) in order to create an artificial neutral, supplied to the load side [5], as shown in Fig. 1(a).…”

“…Control methods of VIENNA rectifier in current literatures are mainly space vector method [5][6] and one cycle control algorithm [7][8][9][10]. Literatures studying DC side midpoint voltage balance of VIENNA rectifier are mainly based on DQ transformation and space vector method [6,[10][11][12][13].…”

A Fast Processing Discontinuous Control Strategy for Vienna Rectifier

“…In most conventional control strategies for Vienna rectifier, an offset voltage injection or an extra feedback control loop including PI controller is modified to provide DC-link voltage regulation. An additional balancing leg including two extra MOSFET switches and an inductor, has been applied to the space vector modulated Vienna rectifier [18]. The relationship between the controlled duty cycle and the voltage unbalance is established through the state-space model of the system and based on this relationship, an optimal zero-sequence component for the duty cycle is found to achieve zero current injection to the DC-link neutral point [19].…”