单相中频电源新型下垂并联控制技术研究

Research on Novel Droop Parallel Control Technology of Single Phase Intermediate Frequency Power Supply

针对电源并联运行时传统下垂控制方法中对线路阻抗过于敏感的缺点,在此提出一种基于功率积分/电压的新型下垂控制策略,并结合相角/有功下垂和H_∞鲁棒电压跟踪控制技术,实现了单相中频电源之间的功率均分,且不受线路阻抗不匹配的影响。通过理论分析及仿真和实验验证,对这两种方法进行了对比分析,结果表明所提新型下垂控制策略对输出无功功率进行了补偿,克服传统下垂方法中存在的问题,30 kVA阻性负载和24 kVA阻感负载时,在不同线路阻抗情况下仅为5 A和7 A,远低于传统下垂控制方法的18 A和20 A,仿真和实验结果充分说明了所提控制方法的正确性和有效性。

Aiming at the disadvantage that the traditional droop control method is too sensitive to the line impedance when the power supply is in parallel operation,a new droop control strategy based on power integration/voltage is proposed,and combined with phase angle/active power droop and H∞robust voltage tracking control technology,the power sharing between single-phase intermediate frequency power sources is realized,and it is not affected by line impedance mismatch.The results show that the new droop control strategy compensates the output reactive power and overcomes the problems existing in the traditional droop control method.For 30 kVA resistive load and 24 kVA resistive load,it is only 5 A and 7 A under different line impedance,which is much lower than 18 A and 20 A of the traditional droop control method.The simulation and experimental results fully demonstrate the correctness and effectiveness of the proposed control method.