控制定桨恒速风电机组变速运行的变频和励磁系统

An Excitation and Converter System for Controlling Fixed Speed and Fixed Pitch Wind Turbines to Variable Speed

针对定桨距恒速型风力发电机对风能的利用效率较低的问题,提出了采用一种新型变频和励磁系统将其改造成为变速风力发电机的方法。设计的新型可消谐励磁调节系统用于定桨距恒速风力发电机励磁,与风力发电机接入电网的变频器进行协调控制,可使风力发电机根据风速变转速运行,大大提高了对风能的利用率。同时,本励磁调节系统可消除谐波的特点降低了变频器产生的谐波对风力发电机的不利影响,提高了风力发电机系统的性能价格比。

The main problem ofthe fixed pitch and fixed speed wind turbines system is the low availability of wind energy. The best solution is to change it to variable speed wind turbines system, and to interconnect it to power grid through rectifying circuit and inverter unit. In this work, a new-style equipment was designed which can regulate the excitation current and eliminate the harmonic current. It can control coordinately with the rectifier and inverter. In this proposed system, the rotating speed of the generator is variable, and the availability of both wind energy and generator is improved. And the excitation regulating equipment can also eliminate the harmonic current caused by the rectifier and inverter, which can step down the detriment to the torque of the generator and improve the performance-cost ratio of the whole system.