基于IGBT的大功率H桥快控电源控制策略
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摘要
为了控制快速变化的等离子体垂直位移,研制了基于IGBT的大功率H桥快速可控电源,额定参数为±500V/±3kA。旧的快控电源由于结构以及控制策略的原因,导致IGBT关断过电压高、工作频率低、续流过程不可控产生的电压宽脉冲等问题。针对这些不足,新的H桥快速控制电源首先重新设计了电源的结构,使其更加紧凑,减小了电源的寄生电感,从而降低了IGBT的关断过电压。其次,通过改变电源的控制方式,电源的工作频率达到IGBT开关频率的2倍,增大了电源输出电压的频率,等效提高了电源的快速响应能力。同时,为电源重新设计了一种可控的续流方式,通过对IGBT的控制改变电路的续流回路,使续流过程可控。通过实验研究可知,电源的响应时间为125μs,在等离子体位移发生变化时电流能够快速响应,控制等离子体位移,保证托卡马克装置的正常放电,并且通过新的续流控制方式,使电源在续流时不会再出现续流不可控导致的宽电压脉冲问题,输出电压能够有效地跟踪给定电压值变化。
In order to track the plasma rapid change in the vertical displacement,an H-bridge quick response power supply based on IGBT has been developed,rating of the power supply parameters for+500V/+3kA.Due to the structure and control strategy,the old quick response power supply has some deficiencies such as IGBT turn-off overvoltage,low working frequency,wide pulse voltage of uncontrolled flyback process.Aiming to solve these deficiencies,firstly,a new H-bridge quick response power supply redesigns the structure to reduce the power of the parasitic inductance,which brings down the IGBT turn-off overvoltage.Secondly,through changing the control mode of power supply,the working frequency of the power supply is two times the IGBT switch frequency,and the frequency of the power supply output voltage is increased,equivalent to improve the fast response ability of the power supply.At the same time,a kind of controllable flyback mode is designed,which changes the flyback circuit with IGBT to make the flyback process under control.Tested by the experimental study,the response time of the power supply is 125μs.The power supply has a quick response when the displacement of plasma changes,ensuring the normal discharge of tokamak,and with the new freewheeling control mode,the wide voltage pulse will not happen again,thus the output voltage can effectively track the given voltage change.
In order to track the plasma rapid change in the vertical displacement,an H-bridge quick response power supply based on IGBT has been developed,rating of the power supply parameters for+500V/+3kA.Due to the structure and control strategy,the old quick response power supply has some deficiencies such as IGBT turn-off overvoltage,low working frequency,wide pulse voltage of uncontrolled flyback process.Aiming to solve these deficiencies,firstly,a new H-bridge quick response power supply redesigns the structure to reduce the power of the parasitic inductance,which brings down the IGBT turn-off overvoltage.Secondly,through changing the control mode of power supply,the working frequency of the power supply is two times the IGBT switch frequency,and the frequency of the power supply output voltage is increased,equivalent to improve the fast response ability of the power supply.At the same time,a kind of controllable flyback mode is designed,which changes the flyback circuit with IGBT to make the flyback process under control.Tested by the experimental study,the response time of the power supply is 125μs.The power supply has a quick response when the displacement of plasma changes,ensuring the normal discharge of tokamak,and with the new freewheeling control mode,the wide voltage pulse will not happen again,thus the output voltage can effectively track the given voltage change.
引文
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[2]Kardaun O.Interval estimation of global H-mode energy confinement in ITER[J].Plasma Physics and Controlled Fusion,1999,41(2):429-469.
[3]Troyon F.MHD-limits to plasma confinement[J].Plasma Physics and Controlled Fusion.1984,26(1):209-215.
[4]刘成岳,陈美霞,吴斌,等.EAST装置垂直不稳定性研究[J].核聚变与等离子体物理,2009,29(4):301-304.(Liu Chengyue,Chen Meixia,Wu Bin,et al.Study on vertical displacement instability on EAST Tokamak.Nuclear Fusion and Plasma Physics,2009,29(4):301-304)
[5]刘琳,张锦华,夏凡,等.HL-2M等离子体垂直不稳定性的反馈控制研究[J].核聚变与等离子体物理,2008,28(1):49-53.(Liu Lin,Zhang Jinhua,Xia Fan,et al.Feedback control research of the HL-2Mplasma vertical instability.Nuclear Fusion and Plasma Physics,2008,28(1):49-53)
[6]李芳著,高庆弟,张锦华,等.HL-2A装置位形及垂直不稳定性控制[J].核聚变与等离子体物理,2002,22(4):199-202.(Li Fangzhu,Gao Qingdi,Zhang Jinhua,et al.Configuration and control of vertical instability in the HL-2ATokamak.Nuclear Fusion and Plasma Physics,2002,22(4):199-202)
[7]郭帆,何小平,王海洋,等.晶闸管触发开通特性[J].强激光与粒子束,2012,24(10):2483-2487.(Guo Fan,He Xiaoping,Wang Haiyang,et al.Switching characteristics of triggered thyristor.High Power Laser and Particle Beams,2012,24(10):2483-2487)
[8]余琳,黄康,王海军,等.绝缘栅双极晶体管串联关键技术[J].强激光与粒子束,2013,25(5):1315-1319.(Yu Lin,Huang Kang,Wang Haijun,et al.Key technologies on series connection of insulated gate bipolar transistors.High Power Laser and Particle Beams,2013,25(5):1315-1319)