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中文摘要：
为了进行宽范围的电能变换，设计了一种新型的电能变换系统。该变换系统由一种新型的变比可调变压器和电力电子电路构成，根据变压器工作频率的不同，系统可分为工频和中频两种拓扑结构。变比可调变压器是整个变换系统的核心，因而详细介绍了其结构、变比切换顺序、限流电阻的选择以及变比的设计。以超级电容储能的应用为例，介绍了中频变换系统在超级电容放电和充电两种情况下的工作模式和控制方法。在Matlab／Simulink环境下搭建了基于超级电容的三相中频宽范围电能变换系统的模型，对超级电容放电和恒流充电两种工况进行了仿真，并在一台5kVA的单相中频系统样机上进行了硬件试验。仿真结果表明，通过对变比以及外围电力电子电路的控制，超级电容端电压能够大范围变化，而系统电压可以保持稳定。硬件试验结果表明变比可调变压器的变比切换过程对系统输出无影响，验证了系统在实用中的可行性。
英文摘要：
In order to carry out wide range power conversion, a novel electrical transformation system is proposed. The system is composed of a novel tap changing transformer and other power electrical circuits. According to the frequency of the tap changing transformer, the system can be divided into two kinds： work frequency system and intermediate frequency system. The intermediate frequency system is discussed particularly, while principles of the work frequency system can be obtained by analogy. As the core of the transformation system, the novel tap changing transformer is introduced in detail, involving its structure, principles of tap changing, calculation of currentlimiting resistance and design of ratio. Based on its application in super capacitor energy storage, two operational models of the intermediate frequency system are introduced, which are charge and discharge. Control strategies are designed respectively,in which decoupling control and PI control are applied to get a better response. A three-phase intermediate frequency model with super capacitor is built on Matlab/Simulink, and simulations of charge and discharge of the super capacitor are accomplished. Simulation parameters are given, and waves of voltage and current are presented. Moreover,a 5 kVA prototype of single phase intermediate frequency system is made, and some confirmatory experiments are accomplished. Experimental waves are displayed to assess the performance of the trans formation system. Simulation results show that, through the control of ratio and power electrical circuits,the volt age of super capacitor can change in wide range,while the voltage of grid is stable. Experimental results indicate that tap changing process has little impact on system＇s performance. Two conclusions can be obtained： a）The transformation system allows wide range voltage transformation ; b） The little impact of tap changing process and good power quality verifies the feasibility of the system in application.
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