混合可再生能源并网发电中变结构多输入直流变换器的研究

项目名称： 混合可再生能源并网发电中变结构多输入直流变换器的研究

项目编号： No.51207172

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 电气科学与工程学科

项目作者： 孙鹏菊

作者单位： 重庆大学

项目金额： 26万元

中文摘要： 鉴于新能源发电的不稳定和不连续性，多种新能源混合的分布式并网发电系统显示出广阔的发展空间和应用前景。为简化混合可再生能源发电系统的结构和降低成本，多输入直流变换器逐步取代多个单输入直流变换器成为未来的发展趋势。由于各种新能源端电压等级有高有低，在低电压等级输入源单独工作时，为满足直流母线电压的要求，直流变换器必须具有高增益性，而现有的多输入直流变换系统并不能满足该要求。为解决上述问题，本项目提出研究变结构多输入直流变换器的思路，用同一套电路元件，通过简单的切换控制，改变变换器的结构，使其既能实现多输入时的联合供电，又能满足低电压输入源单独工作时的高增益性。本申请项目以变结构多输入变换器的构成、控制方案和系统稳定性分析为研究重点，项目的研究成功将有助于提升混合可再生能源并网发电系统的可靠性和灵活性，降低成本，为新能源发电的推广应用提供一种新的模块化的解决思路，具有较好的理论价值和实用意义。

中文关键词： 混合可再生能源；变结构；多端口变换器；小信号建模；高增益

英文摘要： The exploitation and utilization of renewable resources have attracted a great deal of attention. However, solar energy and wind energy are affected by some factors such as climatic conditions and they are unstable and discontinuous. So it is necessary to integrate the renewable energy resources to form a hybrid power system to provide continuous and stable electric power. In order to simplify the configuration and lower the cost, multiple-input converter (MIC) will be the development tendency replacing the several single-input converters in the hybrid renewable energy power system. Because the voltage level of the renewable resources is quite different, for instance,the PV output voltage is relatively low to about 45V, the multiple-input DC/DC converter should achieve high voltage gain to meet the requirement of DC bus when the renewable resource with lower output voltage worked individually. Unfortunately, the existing multiple-input DC/DC converter cannot meet this requirement. To overcome this problem, the concept of Variable-Structure Multiple-Input DC/DC Converter (VS-MIC) is proposed in this proposal. The VS-MIC can transform to two sub-topologies by controlling the changing circuit to be suitable for the combination mode with several input sources and the individual mode with high voltage gain at lower i

英文关键词： hybrid renewable energy；variable structure；multiple-port converter；small signal modeling；high voltage gain