直流配电系统SRDAB接口变换器的复合容错控制方法
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摘要
针对广泛应用于主动直流配电网的串联谐振型双有源桥(SRDAB)接口变换器典型故障开展研究。首先分析了基于占空比调节和基于全桥变换器拓扑结构重组的容错控制方法,并详细比较了两种方法的容错特性及其固有缺陷。在此基础上,提出了一种复合容错控制方法,该方法实时监测输出电压,在出现电压跌落后通过占空比调节快速恢复电压,并自动重组拓扑结构,实现高效运行,使电路具有故障自主辨识能力和故障后自主恢复能力。相比于传统的容错方法需要大量的硬件冗余和复杂的故障检测电路来检测具体故障,该方法无须增加任何硬件且无需复杂的故障定位方法,通过复合控制即可实现高效可靠的故障容错运行。此外,所提出的方法具有良好的暂态和稳态控制特性,克服了传统容错控制在运行模式切换时刻带来的电流冲击、电压跌落等缺陷。实验证明了所提方法对双有源桥接口变换器容错控制的有效性。
This paper focuses on the typical fault of the series resonant dual-active-bridge(SRDAB)converters which are widely used in active DC distribution systems.Firstly,two fault tolerant control methods including duty-cycle regulation and topology reconfiguration of full-bridge converter,are analyzed and detailed compared on their characteristics and inherent drawbacks.Based on these analyses,a control method of hybrid fault tolerant is proposed.In this method,the output voltage is real-time monitored and can be recovered quickly through duty-cycle regulation if voltage sag appears.Secondly,the circuit automatically reconfigures to realize highly efficient operation if open-circuit fault is identified.By implementing this proposed method,the system acquires self-fault-diagnosis and self-recovery capabilities.Comparing to conventional fault tolerant methods that employ massive hardware redundancy and complex fault detection circuit to identify particular faults,this hybrid control method can realize highly efficient and reliable fault tolerant operation without any additional hardware.Thirdly,the proposed method has favorable transient and steady-state performances,and prevents defects of conventional methods such as current surge and voltage sag appearing when operation mode changes.Finally,experimental results are provided to validate the effectiveness of the proposed method on fault tolerant control for dual-active-bridge interfacing converters.
This paper focuses on the typical fault of the series resonant dual-active-bridge(SRDAB)converters which are widely used in active DC distribution systems.Firstly,two fault tolerant control methods including duty-cycle regulation and topology reconfiguration of full-bridge converter,are analyzed and detailed compared on their characteristics and inherent drawbacks.Based on these analyses,a control method of hybrid fault tolerant is proposed.In this method,the output voltage is real-time monitored and can be recovered quickly through duty-cycle regulation if voltage sag appears.Secondly,the circuit automatically reconfigures to realize highly efficient operation if open-circuit fault is identified.By implementing this proposed method,the system acquires self-fault-diagnosis and self-recovery capabilities.Comparing to conventional fault tolerant methods that employ massive hardware redundancy and complex fault detection circuit to identify particular faults,this hybrid control method can realize highly efficient and reliable fault tolerant operation without any additional hardware.Thirdly,the proposed method has favorable transient and steady-state performances,and prevents defects of conventional methods such as current surge and voltage sag appearing when operation mode changes.Finally,experimental results are provided to validate the effectiveness of the proposed method on fault tolerant control for dual-active-bridge interfacing converters.
引文
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[12]WU F,ZHAO J,LIU Y,et al.Primary source inductive energy analysis based real-time multiple open-circuit fault diagnosis in two-level three-phase PWM boost rectifier[J].IEEE Transactions on Power Electronics,2018,33(4):3411-3423.
[13]CHOI U M,BLAABJERG F,LEE K B.Reliability improvement of a T-type three-level inverter with fault-tolerant control strategy[J].IEEE Transactions on Power Electronics,2015,30(5):2660-2673.
[14]CHOI U M,LEE K B,BLAABJERG F.Diagnosis and tolerant strategy of an open-switch fault for T-type three-level inverter systems[J].IEEE Transactions on Industry Applications,2014,50(1):495-508.
[15]CHOI U M,BLAABJERG F,LEE K B.Study and handling methods of power IGBT module failures in power electronic converter system[J].IEEE Transactions on Power Electronics,2015,30(5):2517-2533.
[16]COSTA L F,BUTICCHI G,LISERRE M.Bidirectional series-resonant DC-DC converter with fault-tolerance capability for smart transformer[C]//Proceedings of 2016IEEE Energy Conversion Congress and Exposition(ECCE),September18-22,Milwaukee,USA.
[17]COSTA L F,BUTICCHI G,LISERRE M.A fault-tolerant series-resonant DC-DC converter[J].IEEE Transactions on Power Electronics,2017,32(2):900-905.
[18]ZHANG W,XU D,ENJETI P N,et al.Survey on faulttolerant techniques for power electronic converters[J].IEEETransactions on Power Electronics,2014,29(12):6319-6331.
[19]CHOI U M,LEE J S,BLAABJERG F,et al.Open-circuit fault diagnosis and fault-tolerant control for a grid-connected NPC inverter[J].IEEE Transactions on Power Electronics,2016,31(10):7234-7247.
[20]RIBEIRO E,CARDOSO A,BOCCALETTI C.Fault-tolerant strategy for a photovoltaic DC-DC converter[J].IEEETransactions on Power Electronics,2013,28(6):3008-3018.
[21]HUBER J,MINIBOECK J,KOLAR J,et al.Generic derivation of dynamic model for half-cycle DCM series resonant converters[J].IEEE Transactions on Power Electronics,2018,33(1):4-7.
[22]WU J,LI Y,SUN X,et al.A new dual-bridge series resonant DC-DC converter with dual tank[J].IEEE Transactions on Power Electronics,2018,33(5):3884-3897.
[23]LI X.A LLC-type dual-bridge resonant converter:analysis,design,simulation,and experimental results[J].IEEETransactions on Power Electronics,2014,29(8):4313-4321.
[24]CORRADINI L,SELTZER D,BLOOMQUIST D,et al.Minimum current operation of bidirectional dual-bridge series resonant DC/DC converters[J].IEEE Transactions on Power Electronics,2012,27(7):3266-3276.
[25]SELTZER D,BLOOMQUIST D,ZANE R,et al.Gainscheduled control of multi angle phase shift modulated dual active bridge series resonant DC/DC converters[C]//Proceedings of 2012IEEE 13th Workshop on Control and Modeling for Power Electronics(COMPEL),June 10-13,2012,Kyoto,Japan.
[26]IBANEZ F M,ECHEVERRIA J M,VADILLO J,et al.Astep-up bidirectional series resonant DC/DC converter using a continuous current mode[J].IEEE Transactions on Power Electronics,2015,30(3):1393-1402.
[27]IBANEZ F,ECHEVERRIA J M,VADILLO J,et al.Frequency response analysis for bidirectional series resonant DC/DC converter in discontinuous mode[J].IET Power Electronics,2014,7(9):2374-2386.
[28]COSTA L F,BUTICCHI G,LISERRE M.A family of seriesresonant DC-DC converter with fault-tolerant capability[C]//Proceedings of 2017 IEEE Applied Power Electronics Conference and Exposition(APEC),March 26-30,2017,Tampa,USA:3378-3384.
[2]李子欣,王平,楚遵方,等.面向中高压智能配电网的电力电子变压器研究[J].电网技术,2013,37(9):2592-2601.LI Zixin,WANG Ping,CHU Zunfang,et al.Research on medium-and high-voltage smart distribution grid oriented power electronic transformer[J].Power System Technology,2013,37(9):2592-2601.
[3]曲平,李子欣,宋鹏先,等.隔离式双向全桥DC-DC变换器预充电研究[J].电工技术学报,2014,29(1):320-325.QU Ping,LI Zixin,SONG Pengxian,et al.Pre-charge strategy study for isolated dual active bridge DC-DC converter[J].Transactions of China Electrotechnical Society,2014,29(1):320-325.
[4]KOLAR J,HUBER J.Solid-state transformers-key design challenges,applicability,and future concepts[R].Long Beach,USA:IEEE,2016.
[5]ORTIZ G,LEIBL M G,HUBER J E,et al.Design and experimental testing of a resonant DC-DC converter for solidstate transformers[J].IEEE Transactions on Power Electronics,2017,32(10):7534-7542.
[6]COSTA L F,BUTICCHI G,LISERRE M.Quad-active-bridge DC-DC converter as cross-link for medium-voltage modular inverters[J].IEEE Transactions on Industry Applications,2017,52(2):1243-1253.
[7]杨波,陈武,曹远志,等.一种适用于海上风电直流并网的谐振升压变换器[J].电力系统自动化,2015,39(4):129-134.DOI:10.7500/AEPS20140327006.YANG Bo,CHEN Wu,CAO Yuanzhi,et al.A step-up resonant converter for DC system of offshore wind farms[J].Automation of Electric Power Systems,2015,39(4):129-134.DOI:10.7500/AEPS20140327006.
[8]宁光富,陈武,曹小鹏,等.适用于模块化级联光伏发电直流并网系统的均压策略[J].电力系统自动化,2016,40(19):66-72.DOI:10.7500/AEPS20151130013.NING Guangfu,CHEN Wu,CAO Xiaopeng,et al.Voltage balancing strategy for DC grid-connected photovoltaic power generation systems with modular cascaded structure[J].Automation of Electric Power Systems,2016,40(19):66-72.DOI:10.7500/AEPS20151130013.
[9]李武华,顾云杰,王宇翔,等.新能源直流微网的控制架构与层次划分[J].电力系统自动化,2015,39(9):156-163.DOI:10.7500/AEPS20141124010.LI Wuhua,GU Yunjie,WANG Yuxiang,et al.Control architecture and hierarchy division for renewable energy DCmicrogrids[J].Automation of Electric Power Systems,2015,39(9):156-163.DOI:10.7500/AEPS20141124010.
[10]吴红飞,邢岩,胡海兵,等.副边调整式三端口半桥DC-DC变换器[J].中国电机工程学报,2011,31(30):1-6.WU Hongfei,XING Yan,HU Haibing,et al.Three-port halfbridge DC-DC converters with post regulation scheme[J].Proceedings of the CSEE,2011,31(30):1-6.
[11]姚源,向鑫,李武华,等.副边移相控制的宽范围升压DC/DC变流器[J].中国电机工程学报,2013,33(24):66-73.YAO Yuan,XIANG Xin,LI Wuhua,et al.Secondary side phase-shift controlled converters for wide voltage range applications[J].Proceedings of the CSEE,2013,33(24):66-73.
[12]WU F,ZHAO J,LIU Y,et al.Primary source inductive energy analysis based real-time multiple open-circuit fault diagnosis in two-level three-phase PWM boost rectifier[J].IEEE Transactions on Power Electronics,2018,33(4):3411-3423.
[13]CHOI U M,BLAABJERG F,LEE K B.Reliability improvement of a T-type three-level inverter with fault-tolerant control strategy[J].IEEE Transactions on Power Electronics,2015,30(5):2660-2673.
[14]CHOI U M,LEE K B,BLAABJERG F.Diagnosis and tolerant strategy of an open-switch fault for T-type three-level inverter systems[J].IEEE Transactions on Industry Applications,2014,50(1):495-508.
[15]CHOI U M,BLAABJERG F,LEE K B.Study and handling methods of power IGBT module failures in power electronic converter system[J].IEEE Transactions on Power Electronics,2015,30(5):2517-2533.
[16]COSTA L F,BUTICCHI G,LISERRE M.Bidirectional series-resonant DC-DC converter with fault-tolerance capability for smart transformer[C]//Proceedings of 2016IEEE Energy Conversion Congress and Exposition(ECCE),September18-22,Milwaukee,USA.
[17]COSTA L F,BUTICCHI G,LISERRE M.A fault-tolerant series-resonant DC-DC converter[J].IEEE Transactions on Power Electronics,2017,32(2):900-905.
[18]ZHANG W,XU D,ENJETI P N,et al.Survey on faulttolerant techniques for power electronic converters[J].IEEETransactions on Power Electronics,2014,29(12):6319-6331.
[19]CHOI U M,LEE J S,BLAABJERG F,et al.Open-circuit fault diagnosis and fault-tolerant control for a grid-connected NPC inverter[J].IEEE Transactions on Power Electronics,2016,31(10):7234-7247.
[20]RIBEIRO E,CARDOSO A,BOCCALETTI C.Fault-tolerant strategy for a photovoltaic DC-DC converter[J].IEEETransactions on Power Electronics,2013,28(6):3008-3018.
[21]HUBER J,MINIBOECK J,KOLAR J,et al.Generic derivation of dynamic model for half-cycle DCM series resonant converters[J].IEEE Transactions on Power Electronics,2018,33(1):4-7.
[22]WU J,LI Y,SUN X,et al.A new dual-bridge series resonant DC-DC converter with dual tank[J].IEEE Transactions on Power Electronics,2018,33(5):3884-3897.
[23]LI X.A LLC-type dual-bridge resonant converter:analysis,design,simulation,and experimental results[J].IEEETransactions on Power Electronics,2014,29(8):4313-4321.
[24]CORRADINI L,SELTZER D,BLOOMQUIST D,et al.Minimum current operation of bidirectional dual-bridge series resonant DC/DC converters[J].IEEE Transactions on Power Electronics,2012,27(7):3266-3276.
[25]SELTZER D,BLOOMQUIST D,ZANE R,et al.Gainscheduled control of multi angle phase shift modulated dual active bridge series resonant DC/DC converters[C]//Proceedings of 2012IEEE 13th Workshop on Control and Modeling for Power Electronics(COMPEL),June 10-13,2012,Kyoto,Japan.
[26]IBANEZ F M,ECHEVERRIA J M,VADILLO J,et al.Astep-up bidirectional series resonant DC/DC converter using a continuous current mode[J].IEEE Transactions on Power Electronics,2015,30(3):1393-1402.
[27]IBANEZ F,ECHEVERRIA J M,VADILLO J,et al.Frequency response analysis for bidirectional series resonant DC/DC converter in discontinuous mode[J].IET Power Electronics,2014,7(9):2374-2386.
[28]COSTA L F,BUTICCHI G,LISERRE M.A family of seriesresonant DC-DC converter with fault-tolerant capability[C]//Proceedings of 2017 IEEE Applied Power Electronics Conference and Exposition(APEC),March 26-30,2017,Tampa,USA:3378-3384.