为及时检测子模块开路故障,提出基于桥臂电压变化量的模块化多电平换流器（MMC）开路故障诊断策略,利用两个采样周期内桥臂电压异常增量来判断故障桥臂,在故障桥臂内计算SM电容电压平均值并与各SM电容电压比较,当两者差值超出阈值时,定位故障SM并更新平均值继续检测其余SM是否故障,从而可检测单个及多个SM发生故障的情况,并经过理论分析研究,给出阈值的设定方法。该策略步骤简捷、检测速度快、运算量小,Matlab/Simulink仿真分析和硬件在环系统实验均验证了其可行性和有效性。
Abstract
A sub-module（SM） open-circuit fault,as one of the common faults in Modular Multilevel Converters （MMC） affects the safe and stable operation of the system. To detect faulty SMs in a timely manner,this paper proposes an MMC open-circuit fault diagnosis strategy based on the variation of arm voltages variation. By using the abnormal arm voltage increment of the arm within two sampling periods, the faulty arm is identified. The average SM capacitor voltage within the faulty arm is then calculated and compared with each individual SM capacitor voltage. When the difference exceeds a set threshold,the faulty SM is located,and the average value is updated to continue detecting any remaining faulty SMs,this allows for the detection of both single and multiple SMs faults. Furthermore,a method for setting the threshold is provided based on theoretical analysis.This strategy features simple steps,fast detection speed,and low computational complexity, enabling the detection of both single and multiple SM faults. The feasibility and effectiveness of the proposed method have been validated through MATLAB/Simulink simulation analysis and hardware-in-the-loop （HIL） system experiments.
关键词
模块化多电平换流器 /
故障检测 /
桥臂电压 /
阈值电压 /
子模块 /
开路故障 /
故障定位
Key words
modular multi-level converters /
fault detection /
arm voltage /
threshold voltage /
sub-module /
open-circuit fault /
fault location
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参考文献
[1] 马文忠, 王昊, 王玉生, 等. 子模块混合型MMC直流输电系统的优化设计及其直流故障穿越策略[J]. 太阳能学报, 2024, 45(9): 80-90.
MA W Z, WANG H, WANG Y S, et al.Optimization design and DC fault traversal strategy of submodule hybrid mmc DC transmission system[J]. Acta energiae solaris sinica, 2024, 45(9): 80-90.
[2] 郑荣亮, 王有元, 刘黎, 等. 考虑热不平衡特征的MMC功率模块寿命预测[J]. 太阳能学报, 2024, 45(2): 368-375.
ZHENG R L, WANG Y Y, LIU L, et al.Lifetime estimation of MMC power modules considering thermal imbalance characteristics[J]. Acta energiae solaris sinica, 2024, 45(2): 368-375.
[3] 夏向阳, 徐雷, 易海淦, 等. 基于多目标递阶模型预测理论的MMC能量协同控制研究[J]. 太阳能学报, 2022, 43(10): 472-481.
XIA X Y, XU L, YI H G, et al.Research on energy cooperative control of MMC based on multi-objective recursive model prediction theory[J]. Acta energiae solaris sinica, 2022, 43(10): 472-481.
[4] HAREDASHT M R, BARAKATI S M, DARMIAN S Y, et al.Open-circuit fault diagnosis strategy for modular multilevel converter semiconductor power switches[C]//2022 13th Power Electronics, Drive Systems, and Technologies Conference (PEDSTC). Tehran, Iran, Islamic Republic of, 2022: 150-154.
[5] BI K T, AN Q T, DUAN J D, et al.Fast diagnostic method of open circuit fault for modular multilevel DC/DC converter applied in energy storage system[J]. IEEE transactions on power electronics, 2017, 32(5): 3292-3296.
[6] WANG J, MA H, BAI Z H.A submodule fault ride-through strategy for modular multilevel converters with nearest level modulation[J]. IEEE transactions on power electronics, 2018, 33(2): 1597-1608.
[7] ZHANG J Z, HU X, XU S, et al.Fault diagnosis and monitoring of modular multilevel converter with fast response of voltage sensors[J]. IEEE transactions on industrial electronics, 2020, 67(6): 5071-5080.
[8] CHEN X X, LIU J J, DENG Z F, et al.A diagnosis strategy for multiple IGBT open-circuit faults of modular multilevel converters[J]. IEEE transactions on power electronics, 2021, 36(1): 191-203.
[9] LIU C K, DENG F J, CAI X, et al.Submodule open-circuit fault detection for modular multilevel converters under light load condition with rearranged bleeding resistor circuit[J]. IEEE transactions on power electronics, 2022, 37(4): 4600-4613.
[10] HU X, JIA H F, ZHANG Y D, et al.An open-circuit faults diagnosis method for MMC based on extreme gradient boosting[J]. IEEE transactions on industrial electronics, 2023, 70(6): 6239-6249.
[11] AN Y, SUN X D, REN B Y, et al.Open-circuit fault diagnosis for a modular multilevel converter based on hybrid machine learning[J]. IEEE access, 2024, 12: 61529-61541.
[12] ZHOU D H, QIU H, YANG S F, et al.Submodule voltage similarity-based open-circuit fault diagnosis for modular multilevel converters[J]. IEEE transactions on power electronics, 2019, 34(8): 8008-8016.
[13] JIN Y, XIAO Q, JIA H J, et al.A novel detection and localization approach of open-circuit switch fault for the grid-connected modular multilevel converter[J]. IEEE transactions on industrial electronics, 2023, 70(1): 112-124.
[14] JIA H F, DENG Y, HU X, et al.A concurrent diagnosis method of IGBT open-circuit faults in modular multilevel converters[J]. IEEE journal of emerging and selected topics in power electronics, 2023, 11(1): 1021-1034.
[15] WANG H R, LI Y, WIJESEKERA A, et al.Switch open-circuit fault detection and localization for modular multilevel converters based on signal synthesis[J]. IEEE journal of emerging and selected topics in power electronics, 2023, 11(5): 5391-5404.
[16] LIU Z H, XIAO L, CAO X, et al.A faulty submodule mathematical model-based localization strategy for switch open-circuit fault of module multilevel converter[J]. IEEE transactions on power electronics, 2023, 38(3): 3899-3916.
[17] GENG Z, HAN M X.Fault localization strategy for modular multilevel converters in rectifier mode under submodule switch open-circuit failure[J]. IEEE Transactions on Circuits and Systems II: Express Briefs, 2020, 67(12): 3222-3226.
[18] LIU C K, DENG F J, HENG Q, et al.Fault localization strategy for modular multilevel converters under submodule lower switch open-circuit fault[J]. IEEE transactions on power electronics, 2020, 35(5): 5190-5204.
[19] LYU Y L, ZI Y S, LI X W.Improved control of capacitor voltage balancing in modular multilevel converter submodules[J]. IEEE access, 2024, 12: 19510-19519.
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