An Adaptive Grid Voltage/Frequency Tracking Method Based on SOGIs on a Shipboard PV–Diesel-Battery Hybrid Power System

Guoling Wang, Xu Liu, Zhenyu Li, Shunxiao Xu and Zhe Chen
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Guoling Wang: School of Marine Engineering, Jimei University, Xiamen 361021, China
Xu Liu: School of Marine Engineering, Jimei University, Xiamen 361021, China
Zhenyu Li: School of Marine Engineering, Jimei University, Xiamen 361021, China
Shunxiao Xu: School of Marine Engineering, Jimei University, Xiamen 361021, China
Zhe Chen: Department of Energy Technology, Aalborg University, Aalborg 9220, Denmark

Energies, 2018, vol. 11, issue 4, 1-20

Abstract: This paper addresses the unbalanced voltage, subharmonic/dc-offset voltage, and low-frequency (LF)/high-frequency (HF) harmonics of a grid voltage tracking method based on second-order generalized integrators (SOGIs) in high voltage/frequency swing on a shipboard photovoltaic (PV)-diesel-battery hybrid power system. To perform this work, a kind of shipboard PV–diesel-battery hybrid power system structure was first analyzed, emphasizing both the active and reactive power (PQ) control strategy and the sensitivity of the phase-locked loop (PLL) that is crucial to the vessel’s electrical networks. Then, the effect of grid voltage harmonics in SOGIs and of voltage/frequency swing on SOGI frequency-locked loop (SOGI-FLL) was studied. Meanwhile, aiming to the adverse power qualities of a shipboard power system (SPS), a SOGI-based structure with prefilter, a dc-offset block, and a positive sequence extractor (SOGI-FDE) was proposed. Finally, to overcome all of the vessel’s grid problems, a new SOGI-based voltage tracking structure, SOGI-FDE-FLL, consisting of SOGI-FDE and SOGI-FLL, was proposed to achieve accurate grid voltage tracking rapidly. This proposed schematic was used as an adaptive grid voltage tracking method to a three-phase three-wire shipboard PV–diesel-battery hybrid power system. Experimental results were obtained validating this proposal.

Keywords: shipboard power system (SPS); vessel; SOGI; PV–diesel-battery; droop control; phase-locked loop (PLL); SOGI-FLL; SOGI-FDE (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
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