Abstract
Small Permanent Magnet Synchronous Generators (PMSGs) are widely used in small rooftop wind turbines. In order to inject the electric power generated by the PMSG, into the grid, a back-to-back AC/DC/AC converter is required. In this paper, a low cost with high efficiency converter is proposed for the rectifier stage to obtain the maximum power per ampere of PMSG. This structure based on Discontinuous Conduction Mode Single-Ended Primary Inductor Converter (DCM SEPIC) with a single power electronic switch, proposes a converter which is cost-effective and suitable for the small wind turbine used in residential applications. Furthermore, other advantages of the proposed converter include obtaining maximum power delivered per ampere using a simple control method and reducing the size of converter inductive filter by exploiting the PMSG internal synchronous reactance as part of the filter. Unlike the conventional DCM Boost rectifiers, the proposed converter has a continuous input current, which results in lower PMSG conduction loss. Operation principles and various operating modes of this converter are discussed in detail in this paper and verified by closed-loop simulation and experimental results for a 500W/200V prototype.
Highlights
Global wind turbine market has been increasing rapidly in the past few years and became one of the fastest growing renewable energy sources with a considerable market share in the world [1]-[3]
DESIGN AND CONTROL OF THE Single-ended primary inductor converter (SEPIC) DCM Power Factor Correction (PFC) Considering the Permanent Magnet Synchronous Generators (PMSGs) operating conditions described in the previous section, the PFC rectifier is optimally designed and an appropriate control circuit is provided for the DCM SEPIC
By using the MPPA method for the tested PMSG, the required current to deliver 500W reduces by 3.5% compared to the conventional PFC method and the PMSG conductive loss decreases 7.1%
Summary
Global wind turbine market has been increasing rapidly in the past few years and became one of the fastest growing renewable energy sources with a considerable market share in the world [1]-[3]. Variable-speed wind turbines with Permanent Magnet Synchronous Generators (PMSGs) are the most common solutions for the small-scale wind power plants because of their direct-drive capability, simple construction, and maintenance-free operation [7]-[9]. With the active front-end converter, the power factor of the rectifier can be improved which leads to input current reduction, and the conduction loss of the PMSG is reduced [9]. Three-phase single-switch DCM Boost seems so simple and efficient, it has a main drawback of discontinuous input current waveform that makes it unsuitable for PMSG applications [17]. The temperature rise reduces the life span of the PMSG and premature aging of the insulation To solve this problem, a DCM SEPIC rectifier is proposed in this paper.
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