双馈抽水蓄能机组用三电平变流器器件损耗分析及其改进调制策略
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摘要
提出一种降低NPC三电平变流器发热严重功率器件损耗的改进调制策略。首先,基于双馈抽水蓄能机组机侧变流器单相桥臂功率模块,研究不同运行工况下功率器件开关动作和电流通路,理论分析器件损耗分布不均现象及发热严重功率器件;其次,在传统调制策略的基础上,对不同合成电压矢量工作区域通过降低发热严重功率器件作用时间,获得改进调制策略;最后,对双馈抽水蓄能机组在发电和电动工况下机侧变流器热性能进行仿真分析。仿真获得发热严重功率器件,且与传统空间矢量调制策略相比,该调制策略能有效降低NPC三电平变流器发热严重功率器件的损耗和结温。
An improved modulation strategy is proposed to depress loss of the hottest device. First,power module of single-phase bridge arm in rotor converter is taken as an example to study power device switch and current path under different operation conditions and analyze unequal loss distribution and of converter and hottest power devices in theory.Then,based on the conventional modulation strategy,by reducing working time of hottest device in different region,improved sequences are proposed considering impact on neutral point. Finally, simulation analysis of thermal performance in rotor converter is carried out. And hottest power devices are obtained and the simulation results show that improved modulation strategy can decrease loss and junction temperature of hottest device in NPC three-level converter.
An improved modulation strategy is proposed to depress loss of the hottest device. First,power module of single-phase bridge arm in rotor converter is taken as an example to study power device switch and current path under different operation conditions and analyze unequal loss distribution and of converter and hottest power devices in theory.Then,based on the conventional modulation strategy,by reducing working time of hottest device in different region,improved sequences are proposed considering impact on neutral point. Finally, simulation analysis of thermal performance in rotor converter is carried out. And hottest power devices are obtained and the simulation results show that improved modulation strategy can decrease loss and junction temperature of hottest device in NPC three-level converter.
引文
[1]景巍,谭国俊,叶宗彬.永磁直驱风力发电系统中两电平与三电平变流器比较[J].电力系统自动化,2011,35(6):92-97.[1]Jing Wei,Tan Guojun,Ye Zongbin.Comparison of twolevel and three-level converters in permanent magnet direct-drive wind power generation system[J].Automation of Electric Power Systems,2011,35(6):92-97.
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[9]吕建国,胡文斌,吴馥云,等.中点箝位型三电平逆变器中点电压低频振荡抑制方法[J].中国电机工程学报,2015,35(19):5039-5049.[9]Lyu Jianguo,Hu Wenbin,Wu Fuyun,et al.Low frequency oscillation suppression scheme of neutralpoint voltage for neutral point clamped three-level inverter[J].Proceedings of the CSEE,2015,35(19):5039-5049.
[10]王松,李庚银,周明.双馈风力发电机组无功调节机理及无功控制策略[J].中国电机工程学报,2014,34(16):2714-2720.[10]Wang Song,Li Gengyin,Zhou Ming.The reactive power adjusting mechanism&control strategy of doubly fed induction generator[J].Proceedings of the CSEE,2014,34(16):2714-2720.
[11]陈娟,何英杰,王新宇,等.三电平空间矢量与载波调制策略统一理论的研究[J].中国电机工程学报,2013,33(9):71-78.[11]Chen Juan,He Yingjie,Wang Xinyu,et al.Research of the unity theory between three-level space vector and carrier-based PWM modulation strategy[J].Proceedings of the CSEE,2013,10(9):26-41.
[12]Qu K,Jin X,Xing Y,et al.A SVPWM control strategy for NPC three-level inverter[A].Power Engineering and Automation Conference[C],wahan,2011.
[13]李宁,王跃,蒋应伟,等.新型三电平变流器中点电压控制策略及其可控区域[J].电机与控制学报,2015,19(1):35-44.[13]Li Ning,Wang Yue,Jiang Yingwei,et al.A novel neutral point voltage control strategy of three-level NPCconverter and its single switch cycle control region analysis[J].Electric Machines&Control,2015,19(1):35-44.
[2]李宁,王跃,雷万钧,等.三电平NPC变流器SVPWM策略与SPWM策略的等效关系研究[J].电网技术,2014,38(5):1283-1290.[2]Li Ning,Wang Yue,Lei Wanjun,et al.Research on equivalent relations between two kinds of SVPWMstrategies and SPWM strategy for three-level neutral point clamped converter[J].Power System Technology,2014,38(5):1283-1290.
[3]陈权,王群京,姜卫东,等.二极管钳位型三电平变换器开关损耗分析[J].电工技术学报,2008,23(2):68-75.[3]Chen Quan,Wang Qunjing,Jiang Weidong,et al.Analysis of switching losses in diode-clamped threelevel converter[J].Transactions of China Electrotechnical Society,2008,23(2):68-75.
[4]Brückner T,Bernet S,Güldner H.The active NPCconverter and its loss-balancing control[J].IEEETransactions on Industrial Electronics,2005,52(3):855-868.
[5]Floricau D,Floricau E,Gateau G.Three-level active NPC converter:PWM strategies and loss distribution[A].Proceedings of the 34th Annual Conference of the IEEE Industrial Electronics Society[C],Orlando,USA,2008.
[6]Deng Y,Li J,Shin K H,et al.Improved modulation scheme for loss balancing of three-level active npc converters[J].IEEE Transactions on Power Electronics,2017,32(4):2521-2532.
[7]Phan T M,Oikonomou N,Riedel G J,et al.PWM for active thermal protection in three level neutral point clamped inverters[J].ECCE Asia Downunder,2013,6144(3):906-911.
[8]Phan T M,Riedel G J,Oikonomou N,et al.Active thermal protection and lifetime extension in 3L-NPC-inverter in the low modulation range[A].Applied Power Electronics Conference and Exposition[C],Charlotte,USA,2015,DOI:10.1109/APEC.2015.7104665.
[9]吕建国,胡文斌,吴馥云,等.中点箝位型三电平逆变器中点电压低频振荡抑制方法[J].中国电机工程学报,2015,35(19):5039-5049.[9]Lyu Jianguo,Hu Wenbin,Wu Fuyun,et al.Low frequency oscillation suppression scheme of neutralpoint voltage for neutral point clamped three-level inverter[J].Proceedings of the CSEE,2015,35(19):5039-5049.
[10]王松,李庚银,周明.双馈风力发电机组无功调节机理及无功控制策略[J].中国电机工程学报,2014,34(16):2714-2720.[10]Wang Song,Li Gengyin,Zhou Ming.The reactive power adjusting mechanism&control strategy of doubly fed induction generator[J].Proceedings of the CSEE,2014,34(16):2714-2720.
[11]陈娟,何英杰,王新宇,等.三电平空间矢量与载波调制策略统一理论的研究[J].中国电机工程学报,2013,33(9):71-78.[11]Chen Juan,He Yingjie,Wang Xinyu,et al.Research of the unity theory between three-level space vector and carrier-based PWM modulation strategy[J].Proceedings of the CSEE,2013,10(9):26-41.
[12]Qu K,Jin X,Xing Y,et al.A SVPWM control strategy for NPC three-level inverter[A].Power Engineering and Automation Conference[C],wahan,2011.
[13]李宁,王跃,蒋应伟,等.新型三电平变流器中点电压控制策略及其可控区域[J].电机与控制学报,2015,19(1):35-44.[13]Li Ning,Wang Yue,Jiang Yingwei,et al.A novel neutral point voltage control strategy of three-level NPCconverter and its single switch cycle control region analysis[J].Electric Machines&Control,2015,19(1):35-44.
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