全桥全控型并网变流器在风力发电系统中的应用  

Application of full bridge full scale power converter for direct-drive wind power system

作　　者：李丽霞[1] 刘颖明[2] 于宏涛[1] 祝尚臻[1] 

机构地区：[1]沈阳工程学院自动控制系,沈阳110136 [2]沈阳工业大学新能源工程学院,沈阳110870

出　　处：《沈阳师范大学学报（自然科学版）》2012年第3期364-368,共5页Journal of Shenyang Normal University:Natural Science Edition

基　　金：国家自然科学基金资助项目(60972164;60904101);沈阳工程学院科技项目(L2011385)

摘　　要：直驱风力发电系统中,变流器是将发电机所发的电能输送至电网的设备,它是完成将发电机发出的变压变频的电能转换成恒压恒频的电能的装置,并能够实现对发电机输出的电流、功率因数等的快速调节,减少对电网的谐波污染。在对比分析了当前水平的全功率并网变流器主电路拓扑结构基础上,重点对永磁直驱风力发电的网侧变流器做了深入的分析,建立了两相旋转坐标系(d-q)下的数学模型。在同步旋转坐标系下,将输入功率因数改善到单位功因,降低了单位谐波含量。同时,在三相全桥全控型直流-交流变流器市电并网下,提出了交-直轴电流闭回路控制,使永磁式同步发电机向电网提供电能。利用Matlab/Simulink搭建系统模型。仿真表明设计的交-直轴电流闭回路控制,具有谐波含量低、响应速度快、风能利用率高、控制效果良好等特点,验证了理论研究的正确性。In direct-driven wind generation system,converter is the only path for the power of the generator feeding to the power grid,it is a device which can change variable voltage variable frequency power into constant voltage constant frequency power,it can regulate the current and the power factor rapidly,and reduce the harmonic pollution on the grid.A detailed description on the topological structure of converter of variable speed constant frequency wind power system is given.A two-phase rotating coordinate system（d-q）of the mathematical model is established.The three-phase grid connection in proposed system uses three-phase full bridge full-controlled inverter and current control to supply real power.It is important for stable and efficient operation of the system,mastering this technology will promote the development of China wind power industry.Makes use of Matlab/Simulink to construct systematic model based on the theory study.Through simulation,the systematic structure designed has the characters of fast response and favorable control effect under both stable and unstable conditions.The credibility of this research is verified.

关 键 词：恒压恒频 并网变流器 拓扑结构 

分 类 号：TM464[电气工程—电器]