主要研究方向包括多电平变换器、多端口电力电子变压器、电解制氢电源、电流源变换器等。主持国家外国专家项目1项，河北省自然科学基金面上项目1项，教育部产学合作协同育人项目1项，河北省高等学校科学技术研究项目（青年项目）1项，燕山大学基础创新科研培育项目1项。以第一作者或通讯作者发表或录用SCI或EI论文10余篇，以第一发明人获得授权发明专利9项，授权实用新型专利1项。担任TPEL、《电源学报》、《电力电子技术》等期刊审稿人。

科研项目：

1) 国家外国专家个人类项目（Y类）（Y20240250）：紧凑型船用多端口氢电耦合功率变换系统;（主持，在研）

2) 河北省自然科学基金面上项目（E2024203205）：直流电流母线耦合多端口电力电子变压器研究;（主持，在研）

3) 河北省高等学校科学技术研究项目（青年项目）（QN2024202）：面向港口氢电耦合系统的复合枢纽多端口变换器研究；（主持，在研）

4) 燕山大学基础创新科研培育项目（2021LGQN007）：基于公共电流环路的轻型多端口电力电子变压器研究；（主持，结题）

教改项目：

1）教育部产学合作协同育人项目（230802496281823）：半虚拟氢电耦合微网实验平台开发；（主持，在研）

主要论文：

[1]L. Sun, X. Guo, Y. Li, A. Syed, and P. Han, "Hierarchical dc current balancing strategy for multilevel current source converters based on differential mode sectional power and dual redundant vector regulation," IEEE Trans. Power Electron., early access, doi: 10.1109/TPEL.2025.3617325.

[2]L. Sun, X. Guo, A. Syed, and X. Wang, "Current-fed dual active bridge converter in the series-connected wind energy conversion system and its current-source-side start-up method," IEEE J. Emerg. Sel. Topics Power Electron., early access, doi: 10.1109/JESTPE.2025.3587494.

[3]L. Sun, X. Guo, X. Wang, H. G. M. Qamar, and A. Syed, "Integration method of clamp circuit and auxiliary power supply for hybrid dab converters in series-connected battery swapping stations," IEEE Trans. Transp. Electrific., vol. 11, no. 5, pp. 12506-12518, Oct. 2025, doi: 10.1109/TTE.2025.3590718.

[4]L. Sun, Z. Wu, F. Xiao, X. Cai, and S. Wang, "Suppression of real power back flow of nonregenerative cascaded h-bridge inverters operating under faulty conditions," IEEE Trans. Power Electron., vol. 31, no. 7, pp. 5161-5175, Jul. 2016, doi: 10.1109/TPEL.2015.2477849.

[5]L. Sun, Z. Wu, W. Ma, F. Xiao, and X. Cai et al., "Analysis of the dc-link capacitor current of power cells in cascaded h-bridge inverters for high-voltage drives," IEEE Trans. Power Electron., vol. 29, no. 12, pp. 6281-6292, Dec. 2014, doi: 10.1109/TPEL.2014.2302081.

[6]L. Sun, Z. Liu, X. Guo, X. Wang, and L. Wang, "Multiphase stacked interleaved buck converter for hydrogen-production electrolysis with a low-voltage-stress ripple compensation circuit,", CSEE Journal of Power and Energy Systems, early access, doi: 10.17775/CSEEJPES.2022.07090.

[7]X. Guo*, S. Zhang, Z. Liu, L. Sun*, and Z. Lu et al., "A new multi-mode fault-tolerant operation control strategy of multiphase stacked interleaved buck converter for green hydrogen production,", vol. 47, no. 71, pp. 30359-30370, 2022/1/1, doi: https://doi.org/10.1016/j.ijhydene.2022.06.249.

[8]B. Wang, L. Sun*, N. Diao, L. Zhang, and X. Guo et al., "Gan-based step-down power converter and control strategy for hydrogen energy systems,"Energy Reports, vol. 9, pp. 252-259, April 2023, doi: https://doi.org/10.1016/j.egyr.2023.03.007.

[9]L. Sun, X. Guo, Y. Han, Z. Lu, and C. Hua, "A dc-current-bus-coupled multi-port power electronic transformer and its control strategy," in Proc. IEEE Int. Power Electron. Appl. Symp. (PEAS), Shanghai, China, 2021, pp. 1-6.

[10] L. Sun, Z. Wu, F. Xiao, X. Cai, and S. Wang, "Design of the pll for the speed sensorless stator-flux-oriented control of induction motors," in Proc.18th International Conference on Electrical Machines and Systems (ICEMS 2015),Pattaya, Thailand, 2015, pp. 1913-1918. 

[11] L. Sun, Z. Wu, F. Xiao, and X. Cai, and C. X., "Suppression of real power back flow of non-regenerative cascaded h-bridge inverters operating under faulty conditions," in Proc. 2014 IEEE Energy Conversion Congress and Exposition (ECCE), Pittsburgh, PA, USA, 2014,  pp. 3075-3082.

[12] L. Sun, F. Zhuo, and L. Xiong, "A fast multi-level space vector pwm method based on sequence cyclic shift," in Proc. 2012 IEEE International Symposium on Industrial Electronics, Hangzhou, China, 2012, pp. 40-45.

授权专利：

[1] 孙乐, 刁乃哲, 高起兴, 艾哈迈德·赛义德,王晓晨, 一种钳位与辅助电源一体的恒流恒压变换器及其启动方法, 202510102124.9.

[2] 孙乐, 郭小强, 华长春, "一种电流源型多端口柔性并网接口装置及控制方法," ZL202110704072.4.

[3] 孙乐, 郭小强, 刘兆国, 卢志刚,  华长春, "一种复合型交错并联直流变换电路及控制方法," ZL202110748906.1

[4] 孙乐, 郭小强, 张哲, 李争, 宋晓飞, 弗雷德·布拉布杰尔, 约瑟普·M·格雷罗. 一种一体式电磁联合制氢装置. ZL 2022 1 0986733.1.

[5] 孙乐, 郭小强, 张哲, 李争, 宋晓飞, 弗雷德·布拉布杰尔, 约瑟普·M·格雷罗. 一种一体式电磁解耦联合制氢装置. ZL202210986922.9.

[6] 孙乐, 谢晔源, 王宇, 姜田贵, 姚宏洋, "一种链式直流耗能装置及控制方法," ZL201910158847.5.

[7] 孙乐, 谢晔源, 姜田贵, 姚宏洋, 邹凯凯,王仙荣, "一种直流耗能装置的功率电压协调控制方法," ZL201910778660.5.

[8] 孙乐, 谢晔源, 姜田贵, 姚宏洋, 一种直流能量动态调节装置的容错控制方法, ZL201910991832.7.

[9] 孙乐, 吴振兴, 蔡信健, 王书秀, 胡文豪, 防止有功回灌的高压变频器容错调制方法, ZL201510616663.0.

[10] 孙乐, 谢晔源, 王宇, 姜田贵, 姚宏洋, 一种链式直流耗能装置, ZL201920271619.4.

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