This paper deals with a design methodology of permanent magnets(PM)generators used for fixed-pitch tidal turbines in a marine renewable energy context.In the case of underwater turbines,fixed-pitch tidal turbines coul...This paper deals with a design methodology of permanent magnets(PM)generators used for fixed-pitch tidal turbines in a marine renewable energy context.In the case of underwater turbines,fixed-pitch tidal turbines could be very attractive and interesting to reduce maintenance operation by avoiding using such a complex electromechanical system for blade-pitching.In this technological case,one of the main control challenges is to ensure power limitation at high tidal current velocities.This control mode can be achieved using the generator flux-weakening.In this context,this paper proposes an original and systemic design methodology to optimize the generator design taking into account the tidal turbine power limitation for high tidal currents velocities.展开更多
针对变速定桨风力发电机组(wind energy conversionsystem,WECS),提出一种简单有效的全风速功率控制策略,不仅可实现机组在全风速范围内的最大功率点跟踪(maximum power point tracking,MPPT)、恒转速以及恒功率控制,还可实现3种工况之...针对变速定桨风力发电机组(wind energy conversionsystem,WECS),提出一种简单有效的全风速功率控制策略,不仅可实现机组在全风速范围内的最大功率点跟踪(maximum power point tracking,MPPT)、恒转速以及恒功率控制,还可实现3种工况之间的自然过渡。首先对其工作原理进行详细地分析,并建立一套实验平台,展开实验研究,验证该方法的可行性及存在的问题;随后,进一步提出一种软失速控制策略,对其工作原理和年发电量的损失情况进行详细分析,论证该方法的可行性和优越性,并展开实验研究。通过与全风速控制策略的对比分析发现,软失速控制策略能显著地降低机组在高风速区的瞬态载荷,延长其使用寿命,并能大幅地降低后级变换器和发电机的额定容量,控制成本。展开更多
文摘This paper deals with a design methodology of permanent magnets(PM)generators used for fixed-pitch tidal turbines in a marine renewable energy context.In the case of underwater turbines,fixed-pitch tidal turbines could be very attractive and interesting to reduce maintenance operation by avoiding using such a complex electromechanical system for blade-pitching.In this technological case,one of the main control challenges is to ensure power limitation at high tidal current velocities.This control mode can be achieved using the generator flux-weakening.In this context,this paper proposes an original and systemic design methodology to optimize the generator design taking into account the tidal turbine power limitation for high tidal currents velocities.
文摘针对变速定桨风力发电机组(wind energy conversionsystem,WECS),提出一种简单有效的全风速功率控制策略,不仅可实现机组在全风速范围内的最大功率点跟踪(maximum power point tracking,MPPT)、恒转速以及恒功率控制,还可实现3种工况之间的自然过渡。首先对其工作原理进行详细地分析,并建立一套实验平台,展开实验研究,验证该方法的可行性及存在的问题;随后,进一步提出一种软失速控制策略,对其工作原理和年发电量的损失情况进行详细分析,论证该方法的可行性和优越性,并展开实验研究。通过与全风速控制策略的对比分析发现,软失速控制策略能显著地降低机组在高风速区的瞬态载荷,延长其使用寿命,并能大幅地降低后级变换器和发电机的额定容量,控制成本。
