基于事件触发领导-跟随控制的孤岛微电网谐波均分和电能质量提升策略

doi:10.19595/j.cnki.1000-6753.tces.251222

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Abstract

With the increasing proliferation of nonlinear loads in islanded microgrids, the magnitude of harmonic power has risen significantly, exacerbating harmonic voltage distortion. Concurrently, mismatched feeder impedances aggravate the unequal distribution of harmonic power among Distributed Generators (DGs), thereby heightening the risk of inverter overload. Although existing distributed control algorithms have achieved notable success in realizing harmonic power sharing among inverter units, challenges remain when simultaneously attempting to govern voltage quality at the Point of Common Coupling (PCC). Specifically, aggressive harmonic compensation aimed at lowering voltage distortion often compels inverters with limited capacity to process excessive harmonic power, leading to overload risks. Consequently, the critical issue of achieving a dynamic balance among harmonic sharing, power quality governance, and overload prevention has not yet been properly resolved. Furthermore, traditional distributed control relies on periodic communication, imposing a heavy burden on the limited bandwidth of microgrid communication networks. To address these challenges, this paper proposes a distributed harmonic power sharing strategy based on an event-triggered leader-follower consensus algorithm to achieve a dynamic balance among harmonic sharing, power quality governance, and equipment safety.
A novel leader-follower consensus framework is established to coordinate the harmonic power absorption of DG units. Unlike traditional methods that allocate harmonics solely based on rated capacity, the proposed strategy incorporates the "remaining capacity" of each inverter into the design of the consensus variable. A virtual leader node is introduced to dynamically regulate the relationship between the total harmonic power absorbed by the microgrid and the available remaining capacity of the inverters. By guiding the consensus variables of all followers (inverters) to converge to the leader’s target, the control logic ensures that inverters with higher safety margins absorb more harmonic power, while those approaching their limits are relieved. This mechanism effectively achieves a dynamic balance among harmonic governance, harmonic power sharing, and inverter overload prevention.
To mitigate the communication burden while maintaining control performance, a Dynamic Event-Triggered Control (DETC) mechanism is integrated into the framework. Instead of continuous or periodic data transmission, information exchange between neighboring inverters occurs only when the measurement error exceeds a time-varying threshold. This threshold is derived based on Lyapunov stability theory, which theoretically guarantees the asymptotic stability of the control system and excludes the occurrence of Zeno behavior. This "communication-on-demand" approach significantly reduces the frequency of data interaction and conserves communication resources.
Hardware-in-the-Loop (HIL) experiments were conducted to validate the effectiveness of the proposed strategy under various complex scenarios, including load steps and plug-and-play operations. Experimental results demonstrate that the proposed strategy successfully realizes the dynamic balance between harmonic power sharing and overload prevention. Specifically, the ratio of harmonic power to remaining capacity for all inverters converged to the target set by the leader node (e.g., 90% utilization), preventing the over-compensation of specific units that occurred in comparison methods. Consequently, the PCC voltage Total Harmonic Distortion (THD) was effectively reduced (e.g., from 9.24% to 4.14%). Furthermore, the DETC mechanism significantly reduced the trigger frequency compared to traditional periodic communication, validating its efficiency in saving bandwidth.
The study concludes that anchoring harmonic allocation to the real-time remaining capacity of inverters offers a robust solution for power quality governance in capacity-constrained microgrids. The introduction of the virtual leader allows for flexible adjustment of the system's global harmonic absorption level. Additionally, the Dynamic Event-Triggered Control (DETC) mechanism effectively alleviates the communication burden among units. This approach provides a practical framework for enhancing the reliability and power quality of islanded microgrids with high nonlinear load penetration.

Key words： Microgrid Harmonic power sharing Power quality Virtual impedance Event-triggered control

Received: 10 July 2025

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TM46

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	Wang Yang
	Hao Yuxin
	Zhou Xiang
	Li Zhuocheng
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Cite this article:

Wang Yang,Hao Yuxin,Zhou Xiang等. Harmonic Sharing and Power Quality Enhancement Strategy for Islanded Microgrids Based on Event-Triggered Leader-Follower Control[J]. Transactions of China Electrotechnical Society, 0, (): 4-.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.251222 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/4

[1] 任碧莹, 孙凯歌, 马保慧, 等. 基于自适应虚拟谐波阻抗控制的孤岛微电网谐波均流策略[J]. 电网技术, 2019, 43(7): 2592-2600.
Ren Biying., Sun Kaige., Ma Baohui., et al.Harmonic Current Sharing Strategy in Islanding Microgrid Based on Adaptive Virtual Harmonic Impedance Control. Power System Technology, 2019, 43(7): 2592-2600.
[2] 刘宿城, 褚勇智, 刁吉祥, 等. 基于输入-状态稳定条件的直流微电网集群分布式大信号稳定性[J]. 电工技术学报, 2025, 40(2): 544-558, 573.
Liu S., Luan L., Li L., et al.Distributed Large-Signal Stability Strength Evaluation and Feedback Control Design for DC Microgrid Clusters. Transactions of China Electrotechnical Society, 2025, 40(2): 544-558, 573.
[3] 刘宿城, 栾李, 李龙, 等. 直流微电网集群的分布式大信号稳定性强度评估及反馈控制设计[J]. 电工技术学报, 2025, 40(19): 6266-6282.
Liu Sucheng, Chu Yongzhi, Diao Jixiang, Zhang Qianjin, Liu Xiaodong.Distributed Large Signal Stability Based on Input-to-State Stability Conditions for DC Microgrid Clusters. Transactions of China Electrotechnical Society, 2025, 40(2): 544-558.
[4] 余洋, 李梦璐, 王卜潇, 等. 基于竞争合作机制的电池储能系统分布式功率分配策略[J]. 电工技术学报, 2025, 40(7): 2335-2352.
Yu Yang, Li Menglu, Wang Boxiao, Xiang Xiaoping, Liu Weiliang.A Distributed Power Allocation Strategy for Battery Energy Storage Systems Based on Competitive-Cooperative Mechanism. Transactions of China Electrotechnical Society, 2025, 40(7): 2335-2352.
[5] 王浩, 仵哲, 康博阳, 等. 考虑电动汽车和蓄电池联合储能的交直流混合微电网功率协调控制策略[J]. 电工技术学报, 2024, 39(19): 6085-6103.
Wang Hao, Wu Zhe, Kang Boyang, Li Bin, Li Shaoling.Power Coordinated Control Strategy for AC/DC Hybrid Microgrid Considering Combined Energy Storage of Electric Vehicles and Batteries. Transactions of China Electrotechnical Society, 2024, 39(19): 6085-6103.
[6] Shojaee M, Azizi S M.Model predictive control of overloaded stand-alone hybrid AC/DC microgrids[J]. IEEE Transactions on Circuits and Systems I: Regular Papers, 2024, 71(3): 1385-1395.
[7] 罗佳龙, 傅晓帆, 袁旭峰, 等. 基于事件触发的动态一致性馈线负载均衡控制策略[J]. 电力系统保护与控制, 2025, 53(7): 123-132.
LUO Jialong, FU Xiaofan, YUAN Xufeng,et al.Event-triggered dynamic consistency algorithm based feeder load balancing control strategy[J].Power System Protection and Control,2025,53(7):123-132
[8] De D, Ramanarayanan V.Decentralized parallel operation of inverters sharing unbalanced and nonlinear loads[J]. IEEE Transactions on Power Electronics, 2010, 25(12): 3015-3025.
[9] 李卓城, 王杨, 唐俊苗, 等. 基于逆变器剩余容量及自适应虚拟谐波阻抗控制的孤岛微电网谐波功率分配策略[J]. 电网技术, 2023, 47(3): 1169-1185.
Li Zhuocheng., Wang Yang., Tang Junmiao., et al.Harmonic Power Distribution Strategy for Islanded Microgrid Based on Inverter Residual Capacity and Adaptive Virtual Harmonic Impedance Control. Power System Technology, 2023, 47(3): 1169-1185.
[10] Han Y, Li H, Shen P, et al.Review of active and reactive power sharing strategies in hierarchical controlled microgrids[J]. IEEE Transactions on Power Electronics, 2017, 32(3): 2427-2451.
[11] Blanco C, Tardelli F, Reigosa D, et al.Design of a cooperative voltage harmonic compensation strategy for islanded microgrids combining virtual admittance and repetitive controller[J]. IEEE Transactions on Industry Applications, 2019, 55(1): 680-688.
[12] Goh H H, Zhang X, Zhang D, et al.Harmonic virtual impedance control in islanded microgrids for harmonic power sharing and harmonic suppression[J]. CSEE Journal of Power and Energy Systems, 2024: 1-11.
[13] Hoang T V, Lee H H.Virtual impedance control scheme to compensate for voltage harmonics with accurate harmonic power sharing in islanded microgrids[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2021, 9(2): 1682-1695.
[14] Mahmood H, Michaelson D, Jiang J.Accurate reactive power sharing in an islanded microgrid using adaptive virtual impedances[J]. IEEE Transactions on Power Electronics, 2015, 30(3): 1605-1617.
[15] 孟潇潇, 尤泽豪, 张茂凡, 等. 基于背靠背变流器柔性互联微电网群的分层分布式协同控制及其稳定分析[J]. 电工技术学报, 2024, 39(24): 7917-7932.
Meng Xiaoxiao, You Zehao, Zhang Maofan, Shao Bingbing.Distributed Hierarchical Cooperative Control and Stability Analysis of Flexible Interconnected Microgrid Cluster Via Back-to-Back Converters. Transactions of China Electrotechnical Society, 2024, 39(24): 7917-7932.
[16] Zhou J, Kim S, Zhang H, et al.Consensus-based distributed control for accurate reactive, harmonic and imbalance power sharing in microgrids[J]. IEEE Transactions on Smart Grid, 2018, 9(4): 2453-2467.
[17] Nandi R, Tripathy M, Gupta C P.Advanced adaptive virtual impedance based dual mode inverter controller for power and voltage coordination in LV AC microgrid[J]. IEEE Transactions on Industry Applications, 2024, 60(6): 8495-8508.
[18] 余斌, 吴烨, 李华喜, 等. 基于虚拟阻抗的孤岛微电网谐波电流均分方法[J]. 电力电子技术, 2024, 58(6): 127-130.
YU Bin,WU Ye,LI Hua-xi HUANG Kong.(2024).Harmonic Current Equalization Method for Islanded Microgrids Based on Virtual Impedance. Power electronics technology , 2024, 58(6),127-130.
[19] Xiao J, Wang L, Bauer P, et al.Virtual impedance control for load sharing and bus voltage quality improvement in low-voltage AC microgrid[J]. IEEE Transactions on Smart Grid, 2024, 15(3): 2447-2458.
[20] Lu J, Liu X, Savaghebi M, et al.Distributed event-triggered control for harmonic voltage compensation in islanded AC microgrids[J]. IEEE Transactions on Smart Grid, 2022, 13(6): 4190-4201.
[21] 王晴, 刘增, 韩鹏程, 等. 基于变流器输出阻抗的直流微电网下垂并联系统振荡机理与稳定边界分析[J]. 电工技术学报, 2023, 38(8): 2148-2161.
Wang Qing, Liu Zeng, Han Pengcheng, Zhang Hongwei, Liu Jinjun.Analysis of Oscillation Mechanism and Stability Boundary of Droop-Controlled Parallel Converters Based on Output Impedances of Individual Converters in DC Microgrids. Transactions of China Electrotechnical Society, 2023, 38(8): 2148-2161.
[22] 李斌, 罗晓伊. 分布式电源对电力系统电压无功优化影响的研究[J]. 电气技术, 2024, 25(10): 55-61, 78.
LI Bin, LUO Xiaoyi.Research on the influence of distributed generation on electric power system voltage and reactive power optimization. Electrical Engineering, 2024, 25(10): 55-61.
[23] Rodríguez P, Luna A, Candela I, et al.Multiresonant frequency-locked loop for grid synchronization of power converters under distorted grid conditions[J]. IEEE Transactions on Industrial Electronics, 2011, 58(1): 127-138.
[24] Emanuel A E.Summary of IEEE standard 1459: definitions for the measurement of electric power quantities under sinusoidal, nonsinusoidal, balanced, or unbalanced conditions[J]. IEEE Transactions on Industry Applications, 2004, 40(3): 869-876.
[25] Olfati-Saber R, Murray R M.Consensus problems in networks of agents with switching topology and time-delays[J]. IEEE Transactions on Automatic Control, 2004, 49(9): 1520-1533.
[26] 杨冰雪, 卢占会, 姚修远, 等. 基于正则化irm-nn的棒-板长间隙正极性操作冲击放电电压智能预测[J]. 中国电机工程学报, 2023, 43(14): 5683-5693.
Bingxue YANG, Zhanhui LU, Xiuyuan YAO, Weidong SHI, Yujian DING.Intelligent Prediction of Positive Switching Impulse Discharge Voltage of Rod-plane Long Gap Based on Regularized IRM-NN. Proceedings of the CSEE. 2023, 43(14):5683-5692
[27] 逯华, 王喜莲, 周锦晗, 等. 基于虚拟阻抗的车网耦合系统低频振荡抑制[J]. 电工技术学报, 2025, 40(11): 3381-3394.
Lu Hua, Wang Xilian, Zhou Jinhan, He Tingting.Low-Frequency Oscillation Suppression of EMUs-Traction Network Coupling System Based on Virtual Impedance. Transactions of China Electrotechnical Society, 2025, 40(11): 3381-3394.
[28] Wang Z, Chen Y, Li X, et al.Adaptive harmonic impedance reshaping control strategy based on a consensus algorithm for harmonic sharing and power quality improvement in microgrids with complex feeder networks[J]. IEEE Transactions on Smart Grid, 2022, 13(1): 47-57.
[29] 孟潇潇, 王煜琛, 毛荀, 等. 考虑虚拟阻抗功率解耦的构网型变流器暂态稳定分析及控制[J]. 电力系统自动化, 2024, 48(24): 101-111.
MENG Xiaoxiao, WANG Yuchen, MAO Xun, et al.Transient Stability Analysis and Control of Grid-forming Converter Considering Virtual Impedance Power Decoupling[J]. Automation of Electric Power Systems, 2024, 48(24):101-111.
[30] Zhang Z, Chen Z.Consensus of discrete-time multiagent systems with transient performance constraints[J]. IEEE Transactions on Automatic Control, 2024, 69(10): 7096-7103.
[31] Fujioka H.A discrete-time approach to stability analysis of systems with aperiodic sample-and-hold devices[J]. IEEE Transactions on Automatic Control, 2009, 54(10): 2440-2445.