This paper proposes an intelligent and fast controller for the parallel DC-DC converters in the islanded DC microgrids (DCMG) in the shipboard power system applications (SPSs). The existence of constant power loads and propulsion loads in the SPS makes the voltage regulation as an important issue in the islanded DCMG. In this paper, the goal is to provide a fast response and proper voltage regulation and optimal current sharing in the stand-alone shipboard DCMG. To achieve this, a nonlinear I-V droop control is firstly designed in the primary control level to ensure the basic performance. Then, a new model-independent technique, entitled intelligent single input interval type-2 fuzzy logic controller (iSIT2-FLC) combined with sliding mode control (SMC), is suggested to further improve the voltage regulation and current sharing accuracy. In this control scheme, an extended state observer (ESO) is employed to estimate the unknown DCMG dynamics, whereas the SMC is adopted to eliminate the ESO estimation error. Moreover, the dynamic consensus algorithm (DCA) is implemented in the secondary control level to achieve coordinated control between DGs in the SPS. The effectiveness and applicability of the new suggested control approach are validated with hardware-in-theloop (HiL) experimental results.
|IEEE Transactions on Transportation Electrification
|Number of pages
|Published - Sept 2021
- DC-DC converter
- hardware-in-the-loop (HiL)
- intelligent control
- shipboard dc microgrid (DCMG)