主动支撑型储能变流器多机并联的暂态电压优化控制

doi:10.19595/j.cnki.1000-6753.tces.250725

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Abstract The high-proportion wind and solar powers have introduced weak-inertia and low-damping characteristics to power systems. These new changes reduce the ability of grid to resist the voltage and frequency disturbances. Meanwhile, due to the location far away from the main AC grid, the renewable energy bases have relatively weak grid connections. Grid-following inverters based on phase-locked loops have limited frequency and voltage regulation capabilities and cannot actively support grid voltage and frequency. With the employment of voltage-source converters (VSCs) active support control, energy storage systems can mimic the dynamic response of synchronous generators. This endows VSCs with frequency and voltage regulation capabilities and plays a crucial role in enhancing power system stability. Compared to a single VSC, paralleled multiple VSCs can provide greater redundancy and capacity. However, the differences among VSC units in paralleled system can affect system stability and voltage support during grid voltage sags.
Based on the above analysis, when the grid voltage experiences a voltage sag fault, the energy storage VSC faces two demands simultaneously: the transient stability requirements and active voltage support to the grid. Furthermore, the two demands are coupled with each other. To analyze the transient coupling characteristics of the paralleled VSC energy storage system, the dynamic response characteristics of internal electromotive force and grid-connection point voltage during transients are analyzed by the geometric relationship in the phasor diagram and the effect of reactive power loop control. The transient energy interaction impact on the stability of the individual VSC is explained based on the equal-area criterion. Moreover, with the phase-plane method, the transient stability of the paralleled VSC system is analyzed. Then, the influence law of control parameters in the power control loop on the transient stability and voltage support ability is summarized. Based on the above, a joint regulation scheme for improved power loops is proposed, which enables the VSC paralleled system to retain transient stability under grid faults of varying voltage-sag severity and raises the transient voltage support capability at the same time. Finally, the theoretical analysis and the proposed method are verified by simulations and experimental results.
As a result, the following conclusions can be drawn: (1) During grid voltage sags, transient energy interactions occur among multiple VSC units. This is mainly caused by the power flows during the transient response and the phase angle differences, which further determines the energy direction. (2) The transient interactions of paralleled VSC system during grid voltage sags affect their transient stability. Unstable VSC units provide transient energy to the other more stable ones, which can improve their own stability but reduce the stability of the other highly stable VSC units, until the stability of all units tends to align. (3) During the grid voltage sags, the increased power angles not only reduce the transient stability of paralleled system, but also weaken their voltage support. It is effective to enhance system stability and voltage support by increasing the reactive power voltage coefficient and reducing active power output. (4) The voltage support capability and transient stability of the VSC paralleled system are mutually coupled. By improving power loop, the joint regulation can ensure the stable operation of the multiple VSC units under different grid faults with diverse voltage sag degrees and enhance the transient voltage support performance.

Key words： Multi-VSCs paralleled system active voltage support phase portrait transient coupling improved power loop based joint regulation

Received: 30 April 2025

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TM712

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	Zhao Zhengkui
	Han Minxiao
	Chen Laijun

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Zhao Zhengkui,Han Minxiao,Chen Laijun. Transient Voltage Optimization Control for Paralleled Active Support Energy Storage Converters[J]. Transactions of China Electrotechnical Society, 2026, 41(9): 2991-3004.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.250725 OR https://dgjsxb.ces-transaction.com/EN/Y2026/V41/I9/2991

[1] 杨金洲, 李业成, 熊鸿韬, 等. 新能源接入的受端电网暂态电压失稳高风险故障快速筛选[J]. 电工技术学报, 2024, 39(21): 6746-6758.
Yang Jinzhou, Li Yecheng, Xiong Hongtao, et al.A fast screening method for the high-risk faults with transient voltage instability in receiving-end power grids interconnected with new energy[J]. Transactions of China Electrotechnical Society, 2024, 39(21): 6746-6758.
[2] 刘思佳, 刘海涛, 张隽, 等. 基于等效阻抗的虚拟同步机电压支撑影响因素分析与改进控制策略研究[J]. 电工技术学报, 2025, 40(9): 2738-2751.
Liu Sijia, Liu Haitao, Zhang Jun, et al.Research on the analysis of virtual synchronous generator voltage support influence factors and improvement control strategies based on equivalent impedance[J]. Transactions of China Electrotechnical Society, 2025, 40(9): 2738-2751.
[3] 郭小龙, 杨桂兴, 张彦军, 等. 构网型储能变流器并网系统SISO环路增益建模与重塑控制[J]. 电气技术, 2023, 24(2): 24-31, 51.
Guo Xiaolong, Yang Guixing, Zhang Yanjun, et al.Modeling and reshaping control of single input and single output loop gain of the grid-forming energy storage converter grid-connected system[J]. Electrical Engineering, 2023, 24(2): 24-31, 51.
[4] 李建林, 邹菲, 游洪灏, 等. 构网型储能变流器自适应低电压穿越控制策略[J]. 电工技术学报, 2025, 40(9): 2724-2737.
Li Jianlin, Zou Fei, You Honghao, et al.Adaptive low-voltage ride-through control strategy of grid-forming energy storage converter[J]. Transactions of China Electrotechnical Society, 2025, 40(9): 2724-2737.
[5] 王继磊, 张兴. 多逆变器并联系统暂态稳定性分析及其暂态电流注入策略[J]. 高电压技术, 2025, 51(1): 390-400.
Wang Jilei, Zhang Xing.Transient stability analysis and transient current injection strategy of multi-inverter parallel system[J]. High Voltage Engineering, 2025, 51(1): 390-400.
[6] 黄萌, 舒思睿, 李锡林, 等. 面向同步稳定性的电力电子并网变流器分析与控制研究综述[J]. 电工技术学报, 2024, 39(19): 5978-5994.
Huang Meng, Shu Sirui, Li Xilin, et al.A review of synchronization-stability-oriented analysis and control of power electronic grid-connected converters[J]. Transactions of China Electrotechnical Society, 2024, 39(19): 5978-5994.
[7] Chen Shimiao, Sun Yao, Han Hua, et al.Dynamic frequency performance analysis and improvement for parallel VSG systems considering virtual inertia and damping coefficient[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2023, 11(1): 478-489.
[8] 孙鹏飞, 田震, 查晓明, 等. 功率同步型构网变流器并网系统暂态同步稳定性研究综述[J]. 电力系统自动化, 2025, 49(2): 1-19.
Sun Pengfei, Tian Zhen, Zha Xiaoming, et al.Review on research of transient synchronization stability for grid-connected system based on power-synchronization grid-forming converter[J]. Automation of Electric Power Systems, 2025, 49(2): 1-19.
[9] Koudelka J, Macejko S, Toman P, et al.Simplified dynamic model for continental Europe synchronous area separation[C]//2022 22nd International Scientific Conference on Electric Power Engineering (EPE), Koutynad Desnou, Czech Republic, 2022: 1-5.
[10] 杨铭, 曹武, 赵剑锋, 等. 受控电压/电流源型变流器混合多机暂态电压支撑策略[J]. 电工技术学报, 2023, 38(19): 5207-5223, 5240.
Yang Ming, Cao Wu, Zhao Jianfeng, et al.Transient voltage support strategy for hybrid multi-converter of controlled voltage/current source converter[J]. Transactions of China Electrotechnical Society, 2023, 38(19): 5207-5223, 5240.
[11] 郑晨灿, 孙海斌, 王学斌, 等. 基于等效无功弹性的变换器电压支撑能力评估[J]. 华中科技大学学报(自然科学版), 2024, 52(7): 22-28.
Zheng Chencan, Sun Haibin, Wang Xuebin, et al.Evaluation of voltage support capability of transformers based on equivalent reactive power elasticity[J]. Journal of Huazhong University of Science and Technology (Natural Science Edition), 2024, 52(7): 22-28.
[12] 王雪梅, 王艺博, 刘雨桐, 等. 基于虚拟电抗的主动支撑型新能源机组低电压穿越控制方法[J]. 电网技术, 2022, 46(11): 4435-4444.
Wang Xuemei, Wang Yibo, Liu Yutong, et al.Low voltage ride-through control of actively-supported new energy unit based on virtual reactance[J]. Power System Technology, 2022, 46(11): 4435-4444.
[13] Camacho A, Castilla M, Miret J, et al.Positive and negative sequence control strategies to maximize the voltage support in resistive-inductive grids during grid faults[J]. IEEE Transactions on Power Electronics, 2018, 33(6): 5362-5373.
[14] 李大伟, 唐守元, 朱婉路, 等. 基于自适应Q-V特性的储能暂态电压支撑控制策略研究[J]. 太阳能学报, 2024, 45(12): 536-544.
Li Dawei, Tang Shouyuan, Zhu Wanlu, et al.Research on control strategy of ess transient voltage support based on adaptive q-v characteristic[J]. Acta Energiae Solaris Sinica, 2024, 45(12): 536-544.
[15] 姜卫同, 胡鹏飞, 尹瑞, 等. 基于虚拟同步机的变流器暂态稳定分析及混合同步控制策略[J]. 电力系统自动化, 2021, 45(22): 124-133.
Jiang Weitong, Hu Pengfei, Yin Rui, et al.Transient stability analysis and hybrid synchronization control strategy of converter based on virtual synchronous generator[J]. Automation of Electric Power Systems, 2021, 45(22): 124-133.
[16] Dong Dong, Wen Bo, Boroyevich D, et al.Analysis of phase-locked loop low-frequency stability in three-phase grid-connected power converters considering impedance interactions[J]. IEEE Transactions on Industrial Electronics, 2015, 62(1): 310-321.
[17] 袁豪, 袁小明. 用于系统直流电压控制尺度暂态过程研究的电压源型并网变换器幅相运动方程建模与特性分析[J]. 中国电机工程学报, 2018, 38(23): 6882-6892, 7122.
Yuan Hao, Yuan Xiaoming.Modeling and characteristic analysis of grid-connected VSCs based on amplitude-phase motion equation method for power system transient process study in DC-link voltage control timescale[J]. Proceedings of the CSEE, 2018, 38(23): 6882-6892, 7122.
[18] Shuai Zhikang, Shen Chao, Liu Xuan, et al.Transient angle stability of virtual synchronous generators using Lyapunov’s direct method[J]. IEEE Transactions on Smart Grid, 2019, 10(4): 4648-4661.
[19] 罗聪, 陈燕东, 谢志为, 等. 计及电压动态的构网型变流器多机并联系统暂态建模与稳定域估计[J]. 电工技术学报, 2025, 40(9): 2752-2765.
Luo Cong, Chen Yandong, Xie Zhiwei, et al.Transient model and stability region estimation for multiple paralleled grid-forming inverter system[J]. Transactions of China Electrotechnical Society, 2025, 40(9): 2752-2765.
[20] He Xiuqiang, Geng Hua, Li Ruiqi, et al.Transient stability analysis and enhancement of renewable energy conversion system during LVRT[J]. IEEE Transactions on Sustainable Energy, 2020, 11(3): 1612-1623.
[21] Chiang H D, Hirsch M W, Wu F F.Stability regions of nonlinear autonomous dynamical systems[J]. IEEE Transactions on Automatic Control, 1988, 33(1): 16-27.
[22] Wang Guangyu, Fu Lijun, Hu Qi, et al.Transient synchronization stability of grid-forming converter during grid fault considering transient switched operation mode[J]. IEEE Transactions on Sustainable Energy, 2023, 14(3): 1504-1515.
[23] 黄萌, 凌扬坚, 耿华, 等. 功率同步控制的构网型变流器多机交互分析与稳定控制研究综述[J]. 高电压技术, 2023, 49(11): 4571-4583.
Huang Meng, Ling Yangjian, Geng Hua, et al.An overview on multi-VSCs interaction analysis and stability controls of grid-forming converters with power synchronization control[J]. High Voltage Engineering, 2023, 49(11): 4571-4583
[24] 路焱, 宋晓辉, 盛万兴, 等. 计及低电压穿越过程电流动态的新能源并网系统暂态同步稳定分析方法和控制策略[J]. 电网技术, 2025, 49(11): 4556-4567.
Lu Yan, Song Xiaohui, Sheng Wanxing, et al.Analysis method and control strategy for transient synchronous stability of grid-connected new energy resources system considering current dynamics during LVRT[J]. Power System Technology, 2025, 49(11): 4556-4567.
[25] Sun Kun, Yao Wei, Wen Jinyu, et al.A two-stage simultaneous control scheme for the transient angle stability of VSG considering current limitation and voltage support[J]. IEEE Transactions on Power Systems, 2022, 37(3): 2137-2150.
[26] Pal D, Panigrahi B K.Reduced-order modeling and transient synchronization stability analysis of multiple heterogeneous grid-tied inverters[J]. IEEE Transactions on Power Delivery, 2023, 38(2): 1074-1085.
[27] Yi Xiangtong, Peng Yelun, Zhou Quan, et al.Transient synchronization stability analysis and enhancement of paralleled converters considering different current injection strategies[J]. IEEE Transactions on Sustainable Energy, 2022, 13(4): 1957-1968.
[28] 徐耀, 朱玲, 吕振宇, 等. 虚拟同步机孤岛并联系统暂态同步稳定性分析[J]. 电力系统保护与控制, 2023, 51(15): 1-11.
Xu Yao, Zhu Ling, Lü Zhenyu, et al.Transient synchronization stability analysis of a virtual synchronous machine isolated island parallel system[J]. Power System Protection and Control, 2023, 51(15): 1-11.
[29] He Xiuqiang, Pan Sisi, Geng Hua.Transient stability of hybrid power systems dominated by different types of grid-forming devices[J]. IEEE Transactions on Energy Conversion, 2022, 37(2): 868-879.
[30] Li Yujun, Lu Yiyuan, Yang Jialun, et al.Synchronization stability of multiple VSGs embedded power system with controller limits[J]. IEEE Transactions on Power Systems, 2025, 40(1): 834-849.
[31] 吴峰, 鲍颜红, 郑建勇, 等. 计及限流切换的构网型变换器并联系统暂态同步稳定分析[J]. 电力系统自动化, 2025, 49(1): 14-26.
Wu Feng, Bao Yanhong, Zheng Jianyong, et al.Transient synchronous stability analysis of parallel system of grid-forming converters considering current limiting switching[J]. Automation of Electric Power Systems, 2025, 49(1): 14-26.