中频动态电压恢复器研究

针对机场直线加电系统电压稳定性较差的特点,提出采用动态电压恢复器(DVR)以稳定负载电压。首先对中频DVR应用在机场直线加电系统中的技术可行性进行了分析论证,提出了一种单向补偿的DVR设计方案,简化了系统的控制。其次对DVR的电路拓扑进行了分析比较,选取独立的单相全桥电路作为DVR的功率电路。建立了DVR的电路模型,对系统的电压控制策略进行了分析比较,选择负载电压有效值闭环控制作为中频DVR的控制方案。设计并制作了中频DVR样机,实验结果表明在电源电压跌落以及负载突变时DVR均可以稳定负载端电压。

Mid-frequency dynamic voltage restorer

Aiming at the voltage instability of airport beeline power system,the DVR(Dynamic Voltage Restorer) is proposed to stabilize the load voltage. Its feasibility is analyzed and a unilateral compensation scheme is designed to simplify the control of DVR. Based on the comparison of DVR circuit topology,the single-phase full-bridge circuit is selected as its power circuit and the DVR model is established. Based on the analysis of its voltage control strategies,the close-loop control of load voltage RMS is selected for mid-frequency DVR. A mid-frequency DVR prototype is designed and implemented,and the experimental results show that the load voltage is stable during source voltage sag or sudden load change.