一种适用于航空DC/DC变换器短路限流的控制策略
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摘要
针对航空变换器在负载短路时需要输出3倍额定电流的要求,提出了一种适用于航空DC/DC变换器短路限流的控制策略。在传统电压-电流双环控制DC/DC变换器的基础上,引入输出电压前馈控制,即将输出电压作为前馈信号,与电流控制器的输出信号相加共同作为调制信号与三角载波交截。通过合理设计前馈系数,保证电流控制器的输出电压在负载短路前后基本保持不变,旁路了PI补偿网络的延时影响,使得短路瞬间占空比即时修正,有效抑制了短路瞬间的电流冲击。小信号建模分析表明,输出电压前馈的引入基本不会影响原双环控制系统的稳态和动态性能。仿真和实验均验证了该控制策略的有效性。
According to the requirement of three times of rated current when the load is shorted, an improved control method of shorted-load current-limiting for aviation DC/DC converter is proposed. Based on traditional doubleloop control DC/DC converter, the output voltage feed-forward(OVFF) control is introduced. The output voltage is taken as the feed-forward input signal, which is added with the output of the current controller as the modulation signal to achieve intersection with the triangle wave. Through rational design of feed-forward coefficient, it can be ensure that the output of the current controller is roughly constant when the load shorted, which bypasses the delay effect of PI compensation network and corrects the duty cycle instantly, so the current-overshoot can be suppressed effectively. Small signal modeling shows that OVFF control practically does not affect the steady-state and dynamic characteristics of the original double-loop control system. The effectiveness of the proposed control method is verified by both simulation and experiment.
According to the requirement of three times of rated current when the load is shorted, an improved control method of shorted-load current-limiting for aviation DC/DC converter is proposed. Based on traditional doubleloop control DC/DC converter, the output voltage feed-forward(OVFF) control is introduced. The output voltage is taken as the feed-forward input signal, which is added with the output of the current controller as the modulation signal to achieve intersection with the triangle wave. Through rational design of feed-forward coefficient, it can be ensure that the output of the current controller is roughly constant when the load shorted, which bypasses the delay effect of PI compensation network and corrects the duty cycle instantly, so the current-overshoot can be suppressed effectively. Small signal modeling shows that OVFF control practically does not affect the steady-state and dynamic characteristics of the original double-loop control system. The effectiveness of the proposed control method is verified by both simulation and experiment.
引文
[1]秦海鸿,严仰光.多电飞机的电气系统[M].北京:北京航空航天大学出版社,2015.
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[10]Luo Y K,Chiou C C,Wu C H,et al.Transient improvement by window transient enhancement and overshoot suppression techniques in current mode boost converter[J].IEEE Transactions on Power Electronics,2011,26(10):2753-2761.
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[12]Erickson R W,Maksimovic D.Fundamentals of power electronics[M].Norwell:MA.Kluwer,2011.
[13]Kazimierczuk M K,Edstrom A J,Reatti A.Buck PWMDC-DC converter with reference-voltage-modulation feedforward control[C].Circuits and Systems,2001.ISCAS 2001.The 2001 IEEE International Symposium on.IEEE,2001,3:537-540.
[2]Avery C R,Burrow S G,Mellor P H.Electrical generation and distribution for the more electric aircraft[C].Universities Power Engineering Conference,2007,UPEC 2007,42nd International,IEEE,2007:1007-1012.
[3]刘福鑫.高压直流电源系统中DC/DC变换器的研究[D].南京:南京航空航天大学,2004.Liu Fuxing.Reaserch on DC/DC converter for HVDC power system[D].Nanjing:Nanjing University of Aeronautics and Astronautics,2004(in Chinese).
[4]GJB 181B-2012,飞机供电特性[S].北京:中国人民解放军总装备部军标出版发行部,2012.GJB 181B-2012,aircraft power supply characteristics[S].Beijing:General Armament Department of the people's Liberation Army of China Central Military Commission equipment development department,2012(in Chinese).
[5]Chen Hui,Wu Xinke.LLC resonant DC transformer(DCX)with parallel PWM output tight regulation[C].2014 IEEEEnergy Conversion Congress and Exposition(ECCE).IEEE,2014:4742-4747.
[6]石健将,章江铭,龙江涛,等.高频变压器一次侧串联LLC+输出端并联Buck级联直流变换器[J].电工技术学报,2015,30(24):93-102.Shi Jianjiang,Zhang Jiangming,Long Jiangtao,et al.Acascaded DC converter with primary series transformer LLC and output interleaved buck[J].Transactions of China Electrotechnical Society,2015,30(24):93-102(in Chinese).
[7]Matsuo H,Kurokawa F,Takeda T.Analysis of the dynamic characteristics in the overcurrent limited mode of the DC-DC converter[J].IEEE Transactions on Power Electronics,1989,4(2):175-180.
[8]杜雄,周雒维,孙鹏菊.双频Buck变换器的交流小信号模型与控制策略[J].电源学报,2007,5(1):40-47.Du Xiong,Zhou Luowei,Sun Pengju.AC small signal model and control of buck converter with double-frequency[J].Journal of Power Supply,2007,5(1):40-47(in Chinese).
[9]Li Yanming,Mao Xiangyu,Wang Hongyi,et al.An improved hiccup mode short-circuit protection technique with effective overshoot suppression for DC-DC converters[J].IEEE Transactions on Power Electronics,2013,28(2):877-885.
[10]Luo Y K,Chiou C C,Wu C H,et al.Transient improvement by window transient enhancement and overshoot suppression techniques in current mode boost converter[J].IEEE Transactions on Power Electronics,2011,26(10):2753-2761.
[11]Wang P Y,Huang S Y,Fang K Y,et al.An undershoot/overshoot-suppressed current-mode buck converter with voltage-setting control for type-II compensator[C].Solid-State Circuits Conference.IEEE,2015.
[12]Erickson R W,Maksimovic D.Fundamentals of power electronics[M].Norwell:MA.Kluwer,2011.
[13]Kazimierczuk M K,Edstrom A J,Reatti A.Buck PWMDC-DC converter with reference-voltage-modulation feedforward control[C].Circuits and Systems,2001.ISCAS 2001.The 2001 IEEE International Symposium on.IEEE,2001,3:537-540.