Design of an LCL-Coupled Three-Port DC-DC Converter for PV-Storage-Load Systems and Its Dynamic Energy Modulation Strategy
Yang Yuqing1, Xu Song1, Nie Pengqiang1, Jiang Wei2
1. School of Automation Jiangsu University of Science and Technology Zhenjiang 212000 China; 2. College of Intelligent Manufacturing Yangzhou Polytechnic Institute Yangzhou 225000 China
Abstract：With carbon peaking, carbon neutrality goals, and the new energy system transformation, this paper focuses on the key technologies of isolated/non-isolated DC power conversion and transmission among photovoltaic (PV), energy storage, and loads. This paper proposed an LCL-coupled three-port DC-DC converter for PV-storage-load systems and its dynamic modulation strategy. The proposed topology integrates a unified interface for “PV-storage-load” functionality. It employs an LCL coupling network to combine non-isolated DC power transmission with isolated wireless power transfer (WPT). The energy transfer between the PV system and the energy storage system relies on non-isolated DC power transmission, and the energy transfer from the PV-storage to the load is realized through isolated wireless power transmission. This system employs an LCL-LCL resonant coupling topology. On the primary side, a dual-half-bridge topology is employed to achieve dual-port excitation of the resonant network, enabling flexible access to PV and storage via the dual-half-bridge ports. The secondary side employs a full-bridge uncontrolled rectifier to convert the LCL-coupled AC wireless energy into DC, enabling isolated power delivery to the load. The system's working state is defined by the power relations among PV, storage, and load. (1) SIDO Mode: The output power of the PV system is greater than the load power consumption. In this case, the battery operates as an energy storage unit to store the excess electricity generated by the PV system. At this point, the current at the battery port is negative. (2) DISO Mode: The output power of the PV system is insufficient to meet the load power consumption. In this scenario, the battery serves as an energy supplement to supply the required electricity. At this point, the current at the battery port is positive. (3) SISO Mode: This operating mode simulates the nighttime condition where the PV system is unable to generate electricity. Under this condition, the load power consumption is borne by the battery. These working states have been analyzed in detail based on the dynamic state waves of the switching cycle. The system's operating modes under varying power demands and supplies across its PV, storage, and load ports were analyzed. Based on the variation patterns of key topological parameters within a switching cycle, dynamic characteristic equations were established for the DC power transmission feature variables and the wireless power transmission core variables. A dynamic power-flow modulation strategy integrated with a PV maximum power point tracking (MPPT) algorithm was designed. This control strategy achieved MPPT on the PV port, controlled the DC power between the PV and energy storage ports, and regulated the wireless power supplied to the load. A simulation model in the PSIM environment and an experimental platform using the dsPIC33FJ64GS606 digital controller were built. Open-loop and closed-loop simulations and experiments were conducted. The experimental results show that the proposed topology can achieve non-isolated DC power transfer between PV and storage, along with isolated WPT power transfer to the DC load. It exhibits excellent robustness under parameter fluctuations such as load variations and PV switching. The system achieves an efficiency exceeding 80%. The proposed topology and the control strategy are verified.
杨宇晴, 徐松, 聂鹏强, 蒋伟. 基于LCL型耦合的“光-储-荷”三端口DC-DC变换器设计及其动态能量调制策略[J]. 电工技术学报, 2026, 41(10): 3448-3464.
Yang Yuqing, Xu Song, Nie Pengqiang, Jiang Wei. Design of an LCL-Coupled Three-Port DC-DC Converter for PV-Storage-Load Systems and Its Dynamic Energy Modulation Strategy. Transactions of China Electrotechnical Society, 2026, 41(10): 3448-3464.
[1] 高锋阳, 宋志翔, 高建宁, 等. 计及光伏和储能接入的牵引供电系统能量管理策略[J]. 电工技术学报, 2024, 39(3): 745-757. Gao Fengyang, Song Zhixiang, Gao Jianning, et al.Energy management strategy of traction power supply system considering photovoltaic and energy storage access[J]. Transactions of China Electrotechnical Society, 2024, 39(3): 745-757. [2] 彭程, 徐建勇, 赵书琪, 等. 考虑分层碳排放的多时间尺度光储充一体站日前运行策略[J]. 电气技术, 2025, 26(1): 1-13, 63. Peng Cheng, Xu Jianyong, Zhao Shuqi, et al.Day- ahead operation strategy for a multi-timescale inte- grated photovoltaic storage and charging station considering carbon emission stratification[J]. Elec- trical Engineering, 2025, 26(1): 1-13, 63. [3] 祝贺, 谢志远, 曹旺斌, 等. 基于QFSK调制的DC- DC变换器功率/数据复合传输方法[J]. 电力系统自动化, 2024, 48(17): 171-180. Zhu He, Xie Zhiyuan, Cao Wangbin, et al.Power/data composite transmission method of DC-DC converter based on QFSK modulation[J]. Automation of Elec- tric Power Systems, 2024, 48(17): 171-180. [4] 亢清波, 侯云飞, 黄文涛, 等. 分布式供电系统双向DC-DC变换器优化控制方法[J]. 中国设备工程, 2024(11): 99-101. Kang Qingbo, Hou Yunfei, Huang Wentao, et al.Optimal control method of bidirectional DC-DC converter in distributed power supply system[J]. China Plant Engineering, 2024(11): 99-101. [5] 张波, 郭效瑞, 刘亚峰, 等. 直流微电网DC/DC变流器IGBT均温控制[J]. 电气工程学报, 2024, 19(3): 31-40. Zhang Bo, Guo Xiaorui, Liu Yafeng, et al.IGBT temperature equalization control of DC/DC converter in DC microgrid[J]. Journal of Electrical Engineering, 2024, 19(3): 31-40. [6] 秦潘昊, 陈威宇, 胡秦然, 等. 新型电力系统设备状态监测与故障诊断传感芯片关键技术与展望[J]. 电力系统自动化, 2024, 48(6): 83-95. Qin Panhao, Chen Weiyu, Hu Qinran, et al.Key technologies and prospect of equipment condition monitoring and diagnosis sensor chips for new power systems[J]. Automation of Electric Power Systems, 2024, 48(6): 83-95. [7] 孙勇, 张建文, 周剑桥, 等. 适用于交直流混联配电网的多端口柔性互联开关[J]. 中国电机工程学报, 2023, 43(13): 5151-5163. Sun Yong, Zhang Jianwen, Zhou Jianqiao, et al.A novel multiport flexible interconnection switch for AC/DC hybrid distribution network[J]. Proceedings of the CSEE, 2023, 43(13): 5151-5163. [8] Yi Zhehan, Dong Wanxin, Etemadi A H.A unified control and power management scheme for PV- battery-based hybrid microgrids for both grid- connected and islanded modes[J]. IEEE Transactions on Smart Grid, 2018, 9(6): 5975-5985. [9] Uno M, Sugiyama K.Switched capacitor converter based multiport converter integrating bidirectional PWM and series-resonant converters for standalone photovoltaic systems[J]. IEEE Transactions on Power Electronics, 2019, 34(2): 1394-1406. [10] Jalilyan S, Abbasi V, Rahimi Varmenjeh A, et al.High voltage-gain common-ground three-port DC-DC converter with low current ripples on the PV source for standalone applications[J]. IEEE Access, 2024, 12: 80896-80909. [11] 宋钊, 刘明. 模块化多端口无线电能DC-DC变换器建模及其多向功率流解耦控制策略[J]. 电工技术学报, 2022, 37(24): 6262-6271. Song Zhao, Liu Ming.Modular multiport wireless DC-DC converter with multidirectional power flow and its decoupling control strategy[J]. Transactions of China Electrotechnical Society, 2022, 37(24): 6262-6271. [12] Bhattacharjee A K, Kutkut N, Batarseh I.Review of multiport converters for solar and energy storage integration[J]. IEEE Transactions on Power Elec- tronics, 2019, 34(2): 1431-1445. [13] 熊栩巍, 徐松, 聂鹏强, 等. 集成无线电能传输功能的三端口DC-DC功率变换系统研究与设计[J]. 电工技术学报, 2025, 40(12): 3815-3827. Xiong Xuwei, Xu Song, Nie Pengqiang, et al.Research and design of a three-port DC-DC converter system with integrated wireless power transfer capability[J]. Transactions of China Electrotechnical Society, 2025, 40(12): 3815-3827. [14] Hong Jiatu, Yin Jian, Liu Yitao, et al.Energy management and control strategy of photovoltaic/ battery hybrid distributed power generation systems with an integrated three-port power converter[J]. IEEE Access, 2019, 7: 82838-82847. [15] Dao N D, Lee D C, Phan Q D.High-efficiency SiC- based isolated three-port DC/DC converters for hybrid charging stations[J]. IEEE Transactions on Power Electronics, 2020, 35(10): 10455-10465. [16] Li Cong, Liu Jinjun, Du Sixing, et al.A T-type DAB-based isolated DC-DC-AC three-port converter with high power efficiency[J]. IEEE Transactions on Power Electronics, 2023, 38(11): 14178-14194. [17] 周玮, 蓝嘉豪, 麦瑞坤, 等. 无线充电电动汽车V2G模式下光储直流微电网能量管理策略[J]. 电工技术学报, 2022, 37(1): 82-91. Zhou Wei, Lan Jiahao, Mai Ruikun, et al.Research on power management strategy of DC microgrid with photovoltaic, energy storage and EV-wireless power transfer in V2G mode[J]. Transactions of China Electrotechnical Society, 2022, 37(1): 82-91. [18] 左志平, 李英杰, 彭博, 等. 基于共形式磁耦合机构的全方向偏移容忍性无人机无线电能传输系统[J]. 电工技术学报, 2025, 40(14): 4355-4368. Zuo Zhiping, Li Yingjie, Peng Bo, et al.Omnidi- rectional misalignment tolerant an unmanned aerial vehicle wireless power transfer system with conform magnetic coupler[J]. Transactions of China Electro- technical Society, 2025, 40(14): 4355-4368. [19] 王思睿, 丘东元, 张波, 等. 宇称-时间对称磁耦合无线电能传输技术研究进展[J]. 电工技术学报, 2025, 40(12): 3787-3802. Wang Sirui, Qiu Dongyuan, Zhang Bo, et al.A review of parity-time symmetric magnetic coupling wireless power transfer technology[J]. Transactions of China Electrotechnical Society, 2025, 40(12): 3787-3802. [20] 王得安, 张剑韬, 朱春波, 等. 海洋环境对水下无线电能传输系统的影响机理研究进展[J]. 电工技术学报, 2025, 40(3): 653-675. Wang Dean, Zhang Jiantao, Zhu Chunbo, et al.Review of progress in the study of marine envi- ronment effects on underwater wireless power transfer systems[J]. Transactions of China Electro- technical Society, 2025, 40(3): 653-675. [21] 贾亚辉, 陈丰伟, 王智慧, 等. 考虑线圈参数变化的失谐型无线电能传输系统抗偏移方法[J]. 电工技术学报, 2025, 40(12): 3702-3715. Jia Yahui, Chen Fengwei, Wang Zhihui, et al.Anti- misalignment method of detuned wireless power transfer system considering coil parameters variations[J]. Transactions of China Electrotechnical Society, 2025, 40(12): 3702-3715. [22] 孔德乐, 赵晋斌, 毛玲, 等. 无线电能传输系统中利用匝间电容分段补偿线圈的设计与分析[J]. 电工技术学报, 2025, 40(12): 3803-3814. Kong Dele, Zhao Jinbin, Mao Ling, et al.Design and analysis of segmental compensation coils utilizing inter-turn capacitance in wireless power transfer systems[J]. Transactions of China Electrotechnical Society, 2025, 40(12): 3803-3814. [23] 刘旭, 曹宇鹏, 夏晨阳, 等. 基于四矩形正交线圈的无线电能传输系统混合式补偿拓扑优化及其抗偏移性[J]. 电工技术学报, 2025, 40(12): 3828-3841. Liu Xu, Cao Yupeng, Xia Chenyang, et al.Opti- mization of hybrid compensation topology and anti-offset performance of wireless power transfer system based on QRQP coil[J]. Transactions of China Electrotechnical Society, 2025, 40(12): 3828-3841. [24] 张鹏飞, 龚立娇, 马欣欣, 等. 具有可变增益恒压特性的双线圈无线电能传输系统补偿网络设计与分析[J]. 电工技术学报, 2024, 39(5): 1256-1269, 1283. Zhang Pengfei, Gong Lijiao, Ma Xinxin, et al.Analysis and design of compensation network for two-coil wireless power transfer system with variable constant voltage gain characteristics[J]. Transactions of China Electrotechnical Society, 2024, 39(5): 1256-1269, 1283. [25] 李争, 于治昊, 高世豪, 等. 基于有源整流的无线电能传输系统双边LCL零电压软开关控制策略[J]. 电工技术学报, 2025, 40(8): 2380-2392. Li Zheng, Yu Zhihao, Gao Shihao, et al.Two-sided LCL zero voltage switching control strategy based on active rectifier for wireless power transfer system[J]. Transactions of China Electrotechnical Society, 2025, 40(8): 2380-2392. [26] 张胜楠, 王海云, 王茹. 双向无线电能传输系统在V2G中的控制策略研究[J]. 电源学报, 2024, 22(增刊1): 208-216. Zhang Shengnan, Wang Haiyun, Wang Ru.Research on control strategy for bidirectional wireless power transmission system in V2G[J]. Journal of Power Supply, 2024, 22(S1): 208-216.
2026, Vol. 41 
