Abstract
This paper investigates a variable speed wind turbine based on permanent magnet synchronous generator and a full-scale power converter in a stand-alone system. An energy storage system(ESS) including battery and fuel cell-electrolyzer combination is connected to the DC link of the full-scale power converter through the power electronics interface. Wind is the primary power source of the system, the battery and FC-electrolyzer combination is used as a backup and a long-term storage system to provide or absorb power in the stand-alone system, respectively. In this paper, a control strategy is proposed for the operation of this variable speed wind turbine in a stand-alone system, where the generator-side converter and the ESS operate together to meet the demand of the loads. This control strategy is competent for supporting the variation of the loads or wind speed and limiting the DC-link voltage of the full-scale power converter in a small range. A simulation model of a variable speed wind turbine in a stand-alone system is developed using the simulation tool of PSCAD/EMTDC. The dynamic performance of the stand-alone wind turbine system and the proposed control strategy is assessed and emphasized with the simulation results.
Highlights
Wind turbine technology has being undergoing a dramatic development and is the world’s fastest growing energy[1,2,3,4]
The ESS is used to address the intermittent behavior of renewable energy sources in this stand-alone system, which is integrated with the full-scale power converter and connected at the DC-link bus through bi-directional DC/DC converter interfacing circuits
A stand-alone variable speed wind turbine based on permanent magnet synchronous generator (PMSG), full-scale power converter and ESS has been presented in this paper
Summary
Wind turbine technology has being undergoing a dramatic development and is the world’s fastest growing energy[1,2,3,4]. In [13] and [14], the DC-link voltage is indirectly regulated by controlling the PMSG speed variation to regulate the captured power by generator. Reference [7,8] presented a novel control strategy for a variable-speed wind turbine with a PMSG in a stand-alone system, where the load-side inverter is used to regulate the DC-link voltage, output voltage, and frequency. An efficient control strategy for a stand-alone VSWT conversion system is developed, where the wind turbine system is able to fast supply the load and wind speed variation, and keep the load-side voltage amplitude and frequency. A model for variable speed directdrive PMSG wind energy conversion and ESS in a stand-alone generation system is simulated and carried out with the PSCAD/EMTDC
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