基于无直流储能元件小型直驱风力发电系统的一种新型PWM算法  

A NOVEL PWM CONTROL METHOD FOR A DIRECT-DRIVEN WIND POWER GENERATION SYSTEM WITHOUT DC-LINK COMPONENTS

作　　者：赖纪东 茆美琴[1] 丁明[1] 苏建徽[1] 

机构地区：[1]教育部光伏系统工程研究中心,合肥工业大学能源研究所,合肥工业大学电气与自动化工程学院,合肥230009

出　　处：《太阳能学报》2013年第1期21-27,共7页Acta Energiae Solaris Sinica

基　　金：国家科技部国际合作项目(2007DFA71340)

摘　　要：为简化系统结构及减小变流器体积,采用一种新型小型直驱风力发电系统结构,系统发电机侧以电流源形式提供能量,且变流器直流环节无储能电感及电容。由于中间无直流储能环节,直流侧电流波动较大,如何在直流电流波动大的情况下保证并网电流波形正弦及对幅值的控制,是系统控制的关键及难点。通过分析该系统的运行特性,提出一种新型PWM算法,并基于此提出一种动态控制策略,搭建了系统仿真模型。仿真结果表明,应用所提出的PWM算法及控制策略,系统能够很好地实现对并网电流波形及幅值的控制。In small-scale wind energy conversion systems, the most popular topology is the combination of uncon- trolled rectifier, boost dc/dc converter and inverter, in which an inductance and a capacitor are required for energy storage. In order to simplify the system structure and reduce the converter bulk, this paper introduces a novel small wind turbine system, which provides energy in the form of a current source, without DC Link components such as inductance or capacitor. Due to the absence of DC storage components, the DC current in the converter would be tremendous fluctuant. For such a system, this paper presents a novel PWM control scheme and a dynamic control strategy based on it. A system simulation model is established for verification. The simulation results show that the waveforms and amplitude of the grid-connected currents can be well controlled by using the proposed PWM control method and strategy.

关 键 词：风力发电 永磁同步发电机 电流源 动态控制 PWM 

分 类 号：TM464[电气工程—电器]