A Phase Current Reconstruction Technique Using a Single Current Sensor for Interleaved Three-phase Bidirectional Converters

Abstract

Abstract-This paper proposes a new phase current reconstruction technique for interleaved threephase bidirectional dc-dc converters using a single current sensor. In the proposed current reconstruction algorithm, a single current sensor is employed at the dc-link, and the dc-link current information is sampled at either the peak or valley point of the pulse-width modulation (PWM) carriers regularly. From the obtained current information, all phase currents are reconstructed in a single PWM cycle. After that, the digital current controller is applied to achieve current balancing in each phase. Compare to the previous multiple current sensor method, the proposed strategy reduces the number of the current sensors in the interleaved three-phase bidirectional converter as well as reducing potential current sensing error caused by non-ideal characteristics of the multiple current sensors. The effectiveness of the proposed method is verified from the experiments based on a 3kW three-phase bidirectional converter prototype for the automotive battery charging application.

Reconstructed Current Model Predictive Control of NPC Three-Level Grid-Tied Converter With Current Sensor Fault

“…So many scholars have studied the fault tolerant operation of sensor fault [12][13][14]. The residual current sensor can be used to reconstruct the three-phase current and improve the stability of the conversion system, and such strategies are applied in motors and grid-tied converters [15][16][17][18][19]. For the two-level converter, a PWM control strategy using DC-link current to reconstruct the fault phase current is proposed.…”

“…For the two-level converter, a PWM control strategy using DC-link current to reconstruct the fault phase current is proposed. According to the DC-link current information under different switching states, all phase currents are reconstructed in a single PWM cycle [18]. However, under some voltage vectors, the DC-link current cannot reconstruct the fault phase current.…”