Abstract
Pulsed power loads (PPLs) are commonly incorporated in medium voltage dc microgrids on naval vessels. To mitigate their detrimental effects, dedicated energy storage systems can be installed and their converters need to have excellent disturbance rejection capability. To facilitate this objective, a moving-discretized-control-set model-predictive-control (MDCS-MPC) is proposed in this letter and applied on a dual-active-bridge converter. Fixed switching frequency is maintained, enabling easy passive components design. The proposed MDCS-MPC has a small number of calculating points in each switching period, which enables the implementation in standard commercial control platforms. The operating principle of the MDCS-MPC is introduced in development of a cost function that, on one hand, provides stiff voltage regulation; on the other hand, minimizes transformer current stress online. Theoretical claims are verified on a 20 kHz 1 kW dual active bridge.
Highlights
The early electrification attempt on a small electric propelled boat dates back to late 1830s [1]
The proposed Moving discretised control set (MDCS)-Model Predictive Control (MPC) controls the converter output voltage VHV2_p is the predicted output voltage (VHV2) based on the discretized average model of the DAB in (6)
MDCS-MPC shows the smallest amplitude of Gv in the low frequency range, it holds the best performance for source voltage disturbance rejection among all
Summary
The early electrification attempt on a small electric propelled boat dates back to late 1830s [1]. Akter et al [18] presented a model predictive control for the bidirectional isolated DC-DC converters which were operated at 100kHz switching frequency with only 4kHz nominal transformer current This fell into the category of application of MPC in AC power conversions [12] where switching frequency was much higher than fundamental current. The control approach is investigated for DAB converters operating with a transformer current frequency close to the switching devices. Methods [19]–[21] have limitations in DAB converters operating in high power/high switching frequency as the sampling of the instant transformer current becomes more challenging. MDCS-MPC requires low bandwidth current sensing compared to [19]–[21] It is potentially more suitable for high power/high frequency DAB converters.
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