模块级联型多电平固态变压器及其关键控制技术的研究

项目名称： 模块级联型多电平固态变压器及其关键控制技术的研究

项目编号： No.51277162

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 电工技术

项目作者： 石健将

作者单位： 浙江大学

项目金额： 85万元

中文摘要： 通过电力变压器既能有效可靠地将分布式可再生新能源融入电网，以解决电力能源的短缺，又能提供较好的电能质量，确保用户电气设备安全经济运行，这些已成为现代电力系统中亟待解决的关键问题之一。本申请项目拟研究高频固态变压器（SST）作为电力配电变压器，以研究模块级联型多电平SST及其关键控制技术为主要内容，拟提出SST的控制策略方法与技术：①研究解决模块级联型SST功率模块间电压、电流不平衡问题，以突破因高频功率开关器件容量及耐压过低而制约高压大功率SST发展的瓶颈；②研究实现SST与电网间能量双向自动传输，以及通过SST实现分布式新能源的直流并网功能；③研究实现单相SST电网侧的单位功率因数，提高电网的电能质量；④研究实现单相SST的控制技术可扩展到更多模块级联型的多电平单相SST，以及研究实现由三个独立单相SST灵活方便地构成一个三相SST系统。

中文关键词： 固态变压器；模块级联型；三端口；分布式光伏发电；控制

英文摘要： With the increased concerns on environment and cost of energy, the power industry is experiencing fundamental changes with more distributed renewable energy resources or micro-sources such as photovoltaic cells and small wind turbines being integrated into the power grid in the form of distributed generation. In this proposal project, as a novel power distributed transformer, a solid state transformer (SST) will be presented as a novel solution towards integrating distributed renewable energy generation into power grid. This project aims at research on a modular multilevel cascaded SST and its control schemes, solving or realizing the following tasks:(1) The problem of voltage and current unbalancing in each power module will be overcomed, so that the voltage or current stress on switching devices in each module is equal or same, which facilicate the development of the SST with high voltage and high power; (2) automatically bidirectional power transmission between power grid and the SST will be achieved, which is very suitable for integrating distributed renewable energy resources into power grid; (3) the fundamental current in the single-phase SST will be in phase with the grid voltage, achieving unity power factor and supplying high quality electrical energy for user' electrical equipment; (4) the control stra

英文关键词： Solid State Transformer；Module Cascaded；Three Port；Distributed photovoltaic power generation；Control