【摘要】 针对应用于交直流混合微网的电力电子变压器,研究了其DC/DC环节在轻载状态下发生的电压反转和电压跌落现象。通过研究死区影响下DC/DC的运行模态,分析了电压反转发生的原因,并推导死区时间、移相比以及励磁电感之间的关系,得到了相应的设计以及运行参数范围。最后通过Matlab/Simulink软件进行了仿真,并做了实验验证。仿真和实验结果表明电力电子变压器DC/DC环节存在避免电压反转发生的轻载最低限,验证了理论研究的可靠性。更多还原

【Abstract】 The power electronic transformer is widely applied in hybrid AC/DC microgrid and the voltage polarity reversal and voltage sag phenomena of DC/DC of it in low loading are analyzed.The cause of voltage polarity reversal and the relationship of phase-shift ration and magnetic inductance are analyzed by researching operational modal under the influence of dead zone.Design parameter and operational limit are validated to avoid voltage polarity reversal.At last,simulation results using Matlab/Simulink and experimental results are presented to demonstrate the lowest limit of low loading to avoid voltage polarity reversal.更多还原