中频DVR补偿变压器投切电路与控制方法  

Switching Circuit and Control Method of Compensation Transformer for Intermediate Frequency DVR

作　　者：王伟[1] 陈鹏宇 刘宝泉 吴泉兵 WANG Wei;CHEN Pengyu;LIU Baoquan;WU Quanbing(College of Electrical and Control Engineering,Shaanxi University of Science&Technology,Xi’an Shaanxi 710021,China;Xi’an Ruinuo Aviation Equipment Co.Ltd.,Xi’an Shaanxi 710117,China)

机构地区：[1]陕西科技大学电气与控制工程学院,陕西西安710021 [2]西安睿诺航空装备有限公司,陕西西安710117

出　　处：《电子器件》2022年第6期1370-1376,共7页Chinese Journal of Electron Devices

基　　金：陕西省重点研发项目(2020GY-042)。

摘　　要：飞机地面电源为飞机维护提供三相115 V/400 Hz中频电能,但由于现场保障距离远、负载功率大,线缆压降损失严重,导致飞机接口处电能质量超出国军标相关要求,需要进行实时电压补偿。传统的动态电压补偿器(Dynamic Voltage Restorer,DVR)利用双向晶闸管分组投切补偿变压器,但晶闸管开通与关断时间长,在中频条件下存在不可靠关断风险,且其通态损耗较大、发热问题严峻。针对上述问题,提出一种基于双向MOSFET的补偿变压器投切电路,每个补偿变压器副边串入供电线路,原边通过双向MOSFET开关连接于相线LN之间,并将另一组双向MOSFET开关连接补偿变压器原边。进一步提出了基于电流检测的补偿变压器平滑投切控制方法,根据漏感及激磁电感的续流通路,将投切电路分为四个工作模态,通过检测和分析各双向开关电流方向及大小,建立各MOSFET的控制逻辑。最后搭建2 kW实验样机,验证了所提投切电路及控制方法的有效性。Aircraft ground power supply provides 400 Hz/115 V intermediate frequency power for aircraft maintenance.However,due to the long distance of on-site support and high load power,cable voltage drop loss makes the power quality of aircraft interface fail the requirements of national military standards,and realtime voltage compensation needs to be performed.The traditional Dynamic Voltage Restorer(DVR)adopts bidirectional thyristors to switch on and off compensation transformers.However,the thyristors have long turn-on and turn-off time,unreliable turn-off risk,high on-state loss and severe heating problems under medium frequency conditions.To solve the above problems,a compensation transformer switching circuit based on bi-directional MOSFET is proposed.Each auxiliary side of the compensation transformer is connected to the power supply line,the primary side is connected to the phase line LN through bi-directional MOSFET switch,and another set of bi-directional MOSFET switch is connected to the primary side of the compensation transformer.And the smooth switching control method of the compensation transformer based on current detection is further proposed.According to the continuous flow path of leakage inductance and excitation inductor,the switching circuit has four working modes.By detecting and analyzing the direction and magnitude of each bidirectional switching current,the control logic of each MOSFET is established.Finally,a 2 kW prototype is built,and the effectiveness of the proposed switching circuit and control method is verified.

关 键 词：线缆压降损失 晶闸管投切 双向MOSFET投切电路 平滑投切控制 续流通路 

分 类 号：TM762[电气工程—电力系统及自动化]