Transient current control for a step load change in a dual‐active‐bridge converter

Abstract

To deal with a command of step load change for a dual-active-bridge converter, a transient current control with a multi-phase-shift gating scheme is needed. By selecting a reference signal with a floating position, the effective transient current control can be achieved by moving multiple voltage edges in sequence, which would fulfil the step transition of the load level in a fast and smooth manner. Although the analysis is derived using triple-phase-shift schemes, the proposed control can also be applied to other multi-phase-shift schemes, such as extended-phase-shit and dual-phase-shift scheme. An experimental test validated the correctness and effectiveness of the proposed transient current control.

A Piecewise Control Strategy for a Bidirectional Series Resonant Converter

“…According to (14) and (16), there are infinite combinations of α 1 and α 2 that are able to achieve a particular voltage gain at a particular power, in theory. In this work, the top priority for selecting a suitable control strategy is to reduce circulation energy and, meanwhile, to maintain a wide ZVS operation range with the variation of both the load and the converter gain.…”

Comprehensive study of fast load modulation with volt‐second balance in a dual‐active‐bridge converter

“…However, the response time to a load change command would be long. In the literature, there are different types of solutions reported [16][17][18][19][20][21][22][23][24][25][26]. The direct flux control is costly with an extra magnetic sensor and associated connection.…”

“…However, it relies on complicated calculation and brings up high calculation overhead to the controller. The hybrid phase-shift control is a simple method, which aims to control the instantaneous inductor current according to the relationship between the phase-shift and the instantaneous currents at switch transition points in a predictive manner [19][20][21][22][23][24][25][26]. Although the steady state control is still SPS for a DAB converter in [19], small null durations are introduced in two HF voltages temporally to match the resulted inductor current with the expected inductor current.…”

“…The dynamic control using the same method was also applied on a three-phase DAB converter in [26]. Although the variation of the inductor current is directly decided by the voltage-second product, the principle to match the transition inductor current with the expect inductor current in [19][20][21][22][23][24][25][26] can guarantee only a balanced voltagesecond product after the transition process rather than during the transition process.…”

“…Without a zero‐voltage interval, Li and Li [21] proposed a solution named asymmetric double‐side modulation, in which the adjustment of phase‐shift is accomplished by moving the two HF voltages together according to an optimised ratio. It was then adapted for load transition under EPS [22, 23] and extended to the general gating scheme triple‐phase‐shift with three phase‐shift angles [24]. A similar method is then discussed in [25], in which two edges of one HF voltage are moved consecutively to achieve current matching in buck mode operation only.…”