DDS技术在光伏并网发电系统中的应用

摘要

阐述了直接数字频率合成(DDS)技术及其在光伏并网发电系统中的应用原理.提出了利用DDS技术解决光伏系统中的MPPT、相位跟踪和反孤岛控制等问题.通过Matlab系统仿真,并利用基于模型设计的方法实现DDS技术下生成三要素独立可调的正弦脉宽调制(SPWM)波,验证了该方案的可行性.试验结果表明:在光伏系统中应用DDS技术具有独特的优越性,系统控制更加灵活,系统的稳态性能、响应速度及控制精度得到了优化.%This paper describes the DDS (direct digital frequency synthesis) technique, then introduces the principle of it provides in photovoltaic grid-connected generation system, and proposes the PV system solutions such as MPPT, phase tracking and anti islanding control by using of the DDS technology. It uses Matlab to simulate the system, and uses the method of model based design to generate three factors independently adjustable SPWM with DDS technology, to prove the validation of the project. The experimental results show that the application of DDS technology in the photovoltaic system has the unique superiority, such as more flexible system, the steady performance and optimized response speed and control accuracy of the system.