Abstract：There is a growing demand for higher-capacity converters in large-scale energy storage and offshore wind power. The parallel application of IGBT (insulated gate bipolar transistor) modules has emerged as an effective strategy for enhancing converter capacity. This approach not only leverages the robustness and efficiency of IGBT technology but also allows for scalability in power conversion systems, keeping pace with the expanding requirements of modern energy infrastructure. Due to objective factors such as design, processing, and assembly, dynamic and static parasitic parameter differences exist between the branches of the parallel power circuit. In multi-module IGBT parallel operation, the branch current equalization characteristics affect the operating characteristics of the entire parallel system. Therefore, the main concern is improving the dynamic and static current equalization and the derating rate of IGBT modules. The process variables in the form of current rise rate and current peak value at the moment of turn-on current affect the consistency of the switching process of multi-branch IGBTs. Based on the inherent parameter differences of parallel branch IGBT drive control loops, this paper proposes a parallel IGBT differential asynchronous drive technology. Adjusting the asynchronous gap of the drive pulses and changing the amplitude and duration of the drive voltage can drive the switching process current of IGBTs in each branch consistently. Hence, the control of IGBT gate pulses of different branches is coordinated. The effects of the drive signal asynchronous gap drive differential voltage and voltage adjustment time on the dynamic current slope unbalance during the switching process are investigated, and the control parameter coupling relationship is analyzed to optimize the parameter setting method. Based on the actual IGBT module parameters, a mathematical model of the device operating characteristics is established, and the parallel IGBT switching simulation and the actual working condition test are carried out. The results proved that the selected optimized design parameters can significantly improve the dynamic equalization of the switching characteristics of the parallel IGBT module, which verifies the feasibility of the optimized parameter design method. This paper proposes differential voltage asynchronous drive technology for optimizing IGBT parallel switching characteristics. The following conclusions can be drawn. (1) Differential voltage asynchronous drive technology is based on the concept of equivalent current slope. The consistency of the parallel branch current slope can be improved by coordinating the relationship between the three control parameters of the asynchronous gap, drive differential voltage, and voltage adjustment time. (2) The optimal compensation range of the switching process is obtained, and the selected optimal design parameters can significantly optimize the shunt dynamic current uniformity problem. (3) A double-pulse test platform is built to verify the proposed method’s control and compensation effects on dynamic equal-current characteristics during switching. The drive control of four parallel modules is analyzed, which proves the differential pressure asynchronous drive method significantly improves the dynamic characteristics of the multi-module parallel system.
[1] Lin Shuai, Fang Xiaochun, Lin Fei, et al.Lifetime prediction of IGBT modules based on mission profiles in traction inverter application[C]//2019 IEEE Vehicle Power and Propulsion Conference (VPPC), Hanoi, Vietnam, 2019: 1-6. [2] 金肩舸, 杨进锋, 王晓元, 等. 高功率密度智能化集成功率器件及其并联应用研究[J]. 机车电传动, 2023(4): 145-151. Jin Jiange, Yang Jinfeng, Wang Xiaoyuan, et al.Intelligent integrated power device with high power density and research on its parallel application[J]. Electric Drive for Locomotives, 2023(4): 145-151. [3] 陈冲, 贾利民, 赵天宇, 等. 去碳化导向的轨道交通与新能源融合发展——形态模式、解决方案和使/赋能技术[J]. 电工技术学报, 2023, 38(12): 3321-3337. Chen Chong, Jia Limin, Zhao Tianyu, et al.Decar- bonization-oriented rail transportation and renewable energy integration development-configurations, solu- tions, and enabling/empowering technologies[J]. Transactions of China Electrotechnical Society, 2023, 38(12): 3321-3337. [4] Li Jingyi, Wang Xiaohe, Lü Jing, et al.Stability analysis of wind farm connected to hybrid HVDC converter[C]//2020 IEEE 9th International Power Electronics and Motion Control Conference (IPEMC2020-ECCE Asia), Nanjing, China, 2020: 3258-3262. [5] Chen Jianfu, Pei Xingyu, Wu Hongyuan, et al.Steady state characteristics of diode rectifier unit based grid-forming offshore wind power AC system[C]//2022 5th International Conference on Power and Energy Applications (ICPEA), Guangzhou, China, 2022: 651-656. [6] 范兴明, 李涛, 张鑫. 基于电容自然充电换相的混合式直流断路器设计与仿真[J]. 电工技术学报, 2024, 39(11): 3510-3521. Fan Xingming, Li Tao, Zhang Xin.Design and simulation of hybrid DC circuit breaker based on capacitor natural charging commutation[J]. Transa- ctions of China Electrotechnical Society, 2024, 39(11): 3510-3521. [7] 束洪春, 邵宗学, 旷宇. 基于改进型限流混合式直流断路器的开断时序优化研究[J]. 电工技术学报, 2023, 38(22): 6176-6187. Shu Hongchun, Shao Zongxue, Kuang Yu.Research of opening timing optimization based on improved current-limiting hybrid DC circuit breaker[J]. Transa- ctions of China Electrotechnical Society, 2023, 38(22): 6176-6187. [8] Liu Yixin, Huang Xianjin, Wang Fengchuan, et al.Research on the influence of current sharing characteristics under symmetrical power circuits layout for multi-module IGBTs parallel con- nection[C]//2021 23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe), Ghent, Belgium, 2021: 1-8. [9] 冯洪高, 张赤斌, 林宝德. 基于器件内部参数差异的大功率IGBT并联均流控制方法[J]. 电气传动, 2022, 52(6): 28-32. Feng Honggao, Zhang Chibin, Lin Baode.Parallel current sharing control method of high power IGBT based on the difference of internal parameters[J]. Electric Drive, 2022, 52(6): 28-32. [10] Chen Nan, Chimento F, Nawaz M, et al.Dynamic characterization of parallel-connected high-power IGBT modules[J]. IEEE Transactions on Industry Applications, 2015, 51(1): 539-546. [11] Werner R, da Cunha J, Eckel H G. Mutual influence of quasistatic and dynamic current imbalances of paralleled IGBTs[C]//2019 21st European Conference on Power Electronics and Applications (EPE'19 ECCE Europe), Genova, Italy, 2019: 1-8. [12] 曹子楷, 崔翔, 李学宝, 等. 压接型IGBT芯片的参数分散性对其并联时开通均流的影响[J]. 中国电机工程学报, 2023, 43(20): 8025-8037. Cao Zikai, Cui Xiang, Li Xuebao, et al.Influence of parameter dispersion of pressure-bonded IGBT chips on current sharing when they are connected in parallel[J]. Proceedings of the CSEE, 2023, 43(20): 8025-8037. [13] 彭程, 李学宝, 范迦羽, 等. 压接型IGBT器件内部杂散电感差异对瞬态电流分布影响规律研究[J]. 电工技术学报, 2023, 38(11): 2850-2860. Peng Cheng, Li Xuebao, Fan Jiayu, et al.Study on the influence of stray inductance difference in IGBT devices on transient current distribution[J]. Transa- ctions of China Electrotechnical Society, 2023, 38(11): 2850-2860. [14] 赵晨凯, 梁剑, 谢龙飞, 等. 适用于大功率IGBT并联的驱动技术研究[J]. 集成电路应用, 2022, 39(6): 1-3. Zhao Chenkai, Liang Jian, Xie Longfei, et al.Study on parallel technology of high power IGBT drive[J]. Application of IC, 2022, 39(6): 1-3. [15] 唐伟峰, 王长江. 功率器件的并联均流研究[J]. 电气传动, 2023, 53(3): 15-21. Tang Weifeng, Wang Changjiang.Research on current sharing of parallel power devices[J]. Electric Drive, 2023, 53(3): 15-21. [16] 穆峰, 刘宜鑫, 李鑫, 等. IGBT并联应用均流控制技术综述[J]. 电源学报, 2024, 22(1): 119-132. Mu Feng, Liu Yixin, Li Xin, et al.Summary of current sharing control technology for IGBT parallel application[J]. Journal of Power Supply, 2024, 22(1): 119-132. [17] Yu Jintao, Shao Lingfeng, Wei Weiwei, et al.A novel active gate drive for switching loss reduction of IGBT[C]//2023 IEEE PELS Students and Young Professionals Symposium (SYPS), Shanghai, China, 2023: 1-5. [18] 王嘉智, 吴小涛, 刘福临, 等. 基于对偶原理的IGBT并联均流缓冲电路研究[J]. 中国电机工程学报, 2023, 43(10): 3962-3971. Wang Jiazhi, Wu Xiaotao, Liu Fulin, et al.Research on current sharing snubber of parallel IGBTs based on duality principle[J]. Proceedings of the CSEE, 2023, 43(10): 3962-3971. [19] Huang Xianjin, Mu Feng, Liu Yixin, et al.Asynchronous gate signal driving method for reducing current imbalance of paralleled IGBT modules caused by driving circuit parameter difference[J]. IEEE Access, 2021, 9: 86523-86534. [20] 王风川. 基于敏感参数控制的栅极驱动技术研究[D]. 北京: 北京交通大学, 2022. Wang Fengchuan.Research on gate driving tech- nology based on sensitive parameter control[D]. Beijing: Beijing Jiaotong University, 2022.
2025, Vol. 40 
