CAREER: Power Electronics and High Voltage Intensive Solutions for Very Large Scale Megawatt Photovoltaic Systems

职业：超大规模兆瓦级光伏系统的电力电子和高压密集解决方案（摘要）研究目标和方法本研究的目标是显著提高超大规模（VLS）兆瓦级光伏（PV）发电厂的效率和降低成本。该方法是推导和实现新一代混合动力系统的电力电子电路和相关控制策略。首先，我们将推导一个多输入变换器的电路分析框架。基于此框架，将确定VLS系统中PV模块级电池集成的最佳电路。然后，将衍生出一种新型的基于sic的开关电容变换器/逆变器。特别地，我们将研究一种开关电容逆变器。逆变器将具有升压功能，多个电压水平，冗余开关状态，以及开关和电容器上的低电压应力。所有这些新电路将在混合PV-电池系统中实现，以1)最大化所有PV电池的总输出功率，2)降低电池监测和平衡电路的成本，以及3)消除电池组的线路变压器，滤波器和集中式逆变器。更广泛的影响根据公布的数字计算，这项拟议的研究每年将节省至少34亿美元的成本。该项目还将包括一个全面的教育计划：在K-12阶段，将建立一个为期一天的太阳能/智能电网合作研讨会，覆盖2000多名俄亥俄州教师；一个硬件在环仿真平台将用于本科和研究生两级的教学活动；并将与波多黎各大学mayagez分校开展长期实习计划。

CAREER: Power Electronics and High Voltage Intensive Solutions for Very Large Scale Megawatt Photovoltaic Systems(Abstract)Research Objectives and Approaches The objective of this research is to significantly enhance the efficiency and lower the cost of very large scale (VLS) megawatt photovoltaic (PV) power plants. The approach is to derive and realize a new generation of power electronics circuits and associated control strategies for a hybrid PV-battery system.Intellectual Merit First, a circuit analysis framework for multiple-input converters will be derived. Based on this framework, the best circuit for battery integration at the PV module level in VLS systems will be identified. Then, a new breed of SiC-based switched capacitor converter/inverters will be derived. In particular, a switched capacitor inverter will be studied. The inverter will have boost function, multiple voltage levels, redundant switching statues, and low voltage stresses on switches and capacitors. All these new circuits will be implemented in a hybrid PV-battery system to 1) maximize the total power output of all the PV cells, 2) reduce the cost of battery monitoring and balancing circuits, and 3) eliminate line transformers, filters, and centralized inverters for battery packs.Broader ImpactCalculated from published numbers, the proposed research will create at least $3.4 billion in cost savings per year. The project will also include a comprehensive education plan: at the K-12 level, a collaborative one-day Solar Energy/Smart grid workshop will be established to reach 2000+ Ohio teachers; a hardware-in-the-loop simulation platform will be utilized for teaching activities at both the undergraduate and graduate levels; and a long-term internship program with the University of Puerto Rico at Mayagüez will be developed.