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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。
For a wide range of power conversion, a new type of power conversion system is designed. The conversion system consists of a new variable ratio transformer and power electronic circuit structure, according to the different transformer operating frequency, the system can be divided into two kinds of frequency and intermediate frequency topology. Variable ratio transformer is the core of the entire transformation system, and thus introduced its structure, the ratio of switching sequence, the choice of current limiting resistor and variable ratio of the design. Taking the application of supercapacitor energy storage as an example, this paper introduces the working mode and control method of the IF conversion system under the two conditions of supercapacitor discharging and charging. In the Matlab / Simulink environment, a model of three-phase medium-frequency wide range power conversion system based on supercapacitor was built. Two conditions of supercapacitor discharge and constant current charging were simulated. In a 5kVA single-phase IF system prototype On the hardware test. The simulation results show that the voltage across the supercapacitor can vary widely and the system voltage can be kept stable by controlling the variable ratio and the peripheral power electronic circuits. The hardware test results show that the variable ratio switching process of variable ratio transformer has no influence on the output of the system, which verifies the feasibility of the system in practice.