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自供能技术为智能电网中亟待解决的智能监测传感器的现场供电难题提供了一种有效解决方法。其中自供能转换器调理单元的优劣对自供能装置整体性能有重要影响。通过对自供能转换器典型调理单元进行建模和仿真分析,推导出典型调理电路平均功率表达式,分析了调理电路效率的影响因素和开关的控制策略。在此基础上提出了一种改进的调理单元拓扑结构,利用电感的续流作用改善调理电路的电压输出波形。推导并定义了影响因子β,从理论上证明了新拓扑结构的可行性。提出新电路元件参数选择原则,并据此原则设计仿真和实验电路。仿真和实验结果均表明:改进的调理单元拓扑可从输出波形等方面克服原有拓扑的缺点,提高自供能系统的工作效率。
Self-energizing technology provides an effective solution to the field power supply problem of smart monitoring sensors in smart grid. The advantages and disadvantages of the self-powered converter conditioning unit have an important impact on the overall performance of the self-energizing device. By modeling and simulating the typical conditioning unit of self-powered converter, the average power expression of typical conditioning circuit is deduced. The influencing factors of the efficiency of the conditioning circuit and the control strategy of the switch are analyzed. Based on this, an improved topology of the conditioning unit is proposed. The freewheeling effect of the inductor improves the voltage output waveform of the conditioning circuit. The influence factor β is deduced and defined, and the feasibility of the new topology is theoretically proved. Put forward the principle of parameter selection of new circuit components, and design simulation and experimental circuit according to the principle. Simulation and experimental results show that the improved conditioning unit topology can overcome the shortcomings of the original topology in terms of output waveforms and improve the working efficiency of the self-energizing system.