基于负阻抗特性补偿的船舶DC/DC变换器控制策略  

Control Strategy for DC/DC Converter in Ship Based on Negative Impedance Compensation

作　　者：庄绪州 张勤进[1] 刘彦呈[1] ZHUANG Xuzhou;ZHANG Qinjin;LIU Yancheng(Marine Engineering College,Dalian Maritime University,Dalian 116026,China)

机构地区：[1]大连海事大学轮机工程学院

出　　处：《电力系统及其自动化学报》2019年第5期27-32,共6页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(51479018,51709028);中央高校基本科研业务费专项资金资助项目(3132018262);辽宁省自然科学基金资助项目(20170540082)

摘　　要：在船舶直流综合电网中,针对恒功率负载与LC滤波器相连带来的不稳定问题,提出基于负阻抗特性补偿的控制方法。通过引入输入电压前馈,重新设计DC/DC变换器的前馈补偿器,构造出变换器等效的纯阻性输入阻抗,使得DC/DC变换器与LC滤波器的阻抗满足Middlebrook阻抗比判据。在详细阐述了补偿器设计原则的同时,分析了补偿器设计对音频衰减率的影响,消除了DC/DC变换器与LC滤波器之间的不稳定因素,从而提高系统稳定裕度,并使得LC滤波器的体积更小经济性更高。最后,通过奈奎斯特图对系统稳定性进行了论证,同时实验验证了上述控制策略的有效性。In a ship integrated DC power grid,a control method based on negative impedance compensation is proposed,which can solve the unstable problem due to the connection of constant power load to the LC filter.By the introduction of input voltage feed-forward,the feed-forward compensator of an DC/DC converter is redesigned.In this way,the equivalent resistive input impedance of the converter is constructed,thus the impedance of the DC/DC converter and LC filter can satisfy the Middlebrook criterion for impedance ratio.The design principle of the compensator is described in detail;meanwhile,the influence of compensator design on audio susceptibility is analyzed.The unstable factors between the DC/DC converter and LC filter are eliminated to improve the margin of system stability,which guaran.tees a smaller size and a higher economic efficiency of the LC filter.Finally,the stability of the system is investigated via Nyquist diagram,and experimental results verified the effectiveness of the proposed control strategy.

关 键 词：DC/DC变换器 恒功率负载 负阻抗特性 LC滤波器 电流连续模式 

分 类 号：TM46[电气工程—电器]