A direct-drive wind-wave combined energy conversion (WWCEC) system that uses a linear-rotary generator (LRG) has aroused much interest recently. Thanks to the application of the LRG, this system has the advantages of high energy output, low non-working hours, and low development cost. This paper aims to investigate the suitable topology of LRG for the WWCEC system, and two types of permanent magnet (PM) LRGs (PMLRGs) are proposed and compared. One is a mover-PM machine (MPMLRG) which belongs to the PM synchronous generator, and the other one is a stator-PM machine (SPMLRG) which belongs to the flux-switching PM generator. The performance contrast between both PMLRGs is conducted, including no-load and on-load characteristics, in which the mutual effect and thermal analysis are involved. The assembly complexity and manufacturing cost are also analyzed. The comparison results indicate that the MPMLRG has superiority in output power, and the SPMLRG is easier to assemble. To validate our analysis, an MPMLRG prototype is processed and tested. Furthermore, the levelized cost of energy (LCOE) of the WWCEC system is estimated, underscoring its cost-effectiveness. Some suggestions for suitable LRG topologies for the WWCEC system are summarized in the outlook section.
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Nie et al. (2024) studied this question.
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