目前分频风电系统(fractional frequency wind power system,FFWPS)作为海上风力发电系统研究的一个新潮流,已经引起国际学术界的广泛注意。国外学者对分频风电系统应用于用于海上风电的经济性、技术可行性以及关键设备可行性等方面进...目前分频风电系统(fractional frequency wind power system,FFWPS)作为海上风力发电系统研究的一个新潮流,已经引起国际学术界的广泛注意。国外学者对分频风电系统应用于用于海上风电的经济性、技术可行性以及关键设备可行性等方面进行了研究,这说明分频风力发电系统是一种具有竞争力的海上风力发电系统方案。该文针对分频风电系统的结构特点,提出一种适用于分频风电系统风机并网的结构和方法,该并网方法可实现分频风电系统中风机的逐台并网,具有经济和技术上的优势。介绍分频风电系统并网主电路和控制电路的设计,以及所搭建的分频风电系统多机并网实验平台,通过实验证明所提出的并网结构和方法的可行性和有效性。展开更多
Due to the highly demand on the renewable energy sources as a free and a clean power resource, extracting energy from unsteady flow using marine and tidal current turbines has a distinct focusing nowadays. For their r...Due to the highly demand on the renewable energy sources as a free and a clean power resource, extracting energy from unsteady flow using marine and tidal current turbines has a distinct focusing nowadays. For their resource characteristic, extracting energy from marine/tidal current needs a simple and robust converter, which could overcome the drawbacks of the mechanical system such as gearbox and enhance conversion system stability. In this paper a new AC-DC-AC conversion system has been proposed. The new conversion system contains a middle stage DC-DC boost converter, which boost the generated rectified DC voltage higher enough that can enable the PWM inverter to generate the required voltage with the synchronized frequency. In order to investigate the efficient performance of the proposed conversion system especially at low current speed compared to the conventional one, different operating conditions have been studied. Moreover, the effect of including boost converter on the THD （total harmonic distortion） has also been checked. The new conversion system presents its capability to enhance and improve system performance not only with low current speed but also with high current speed.展开更多
文摘目前分频风电系统(fractional frequency wind power system,FFWPS)作为海上风力发电系统研究的一个新潮流,已经引起国际学术界的广泛注意。国外学者对分频风电系统应用于用于海上风电的经济性、技术可行性以及关键设备可行性等方面进行了研究,这说明分频风力发电系统是一种具有竞争力的海上风力发电系统方案。该文针对分频风电系统的结构特点,提出一种适用于分频风电系统风机并网的结构和方法,该并网方法可实现分频风电系统中风机的逐台并网,具有经济和技术上的优势。介绍分频风电系统并网主电路和控制电路的设计,以及所搭建的分频风电系统多机并网实验平台,通过实验证明所提出的并网结构和方法的可行性和有效性。
文摘Due to the highly demand on the renewable energy sources as a free and a clean power resource, extracting energy from unsteady flow using marine and tidal current turbines has a distinct focusing nowadays. For their resource characteristic, extracting energy from marine/tidal current needs a simple and robust converter, which could overcome the drawbacks of the mechanical system such as gearbox and enhance conversion system stability. In this paper a new AC-DC-AC conversion system has been proposed. The new conversion system contains a middle stage DC-DC boost converter, which boost the generated rectified DC voltage higher enough that can enable the PWM inverter to generate the required voltage with the synchronized frequency. In order to investigate the efficient performance of the proposed conversion system especially at low current speed compared to the conventional one, different operating conditions have been studied. Moreover, the effect of including boost converter on the THD （total harmonic distortion） has also been checked. The new conversion system presents its capability to enhance and improve system performance not only with low current speed but also with high current speed.
