Control strategy of three-phase inverter under unbalanced operating conditions based on fractional-order algorithm

Expand
  • (Marine Electrical Engineering College, Dalian Maritime University, Dalian 116026, China)

Online published: 2025-03-21

Abstract

In order to improve the operating ability of the system under unbalanced conditions, harmonic suppression was carried out from the perspective of output voltage control. Firstly, for the neutral point clamped(NPC) three-level inverter, fractional order modeling was performed on the controlled object in different coordinate systems to analyze the manifestations of the fundamental and harmonic components in the output voltage at different coordinates, and control was carried out in a two-phase stationary coordinate system. Secondly, to address the issue of low resonance bandwidth in proportional resonance and proportional complex integrators, an improved fractional-order proportional complex integral control (FO-QPCI) algorithm was adopted to suppress the imbalance of output voltage. Finally, the three-level inverter with the rapid control prototype(MT RCP) produced by ModelingTech software as the core controller was  experimentally verified on the physical platform, and results show that the proposed algorithm has good control ability to output voltage under unbalanced conditions and good suppression effect to harmonics.

Cite this article

XIN Wei, ZHOU Xin, MA Qiwen, NIU Xiaobing . Control strategy of three-phase inverter under unbalanced operating conditions based on fractional-order algorithm[J]. Journal of Dalian Maritime University, 2025 , 51(3) : 113 -122 . DOI: 10.16411/j.cnki.issn1006-7736.2025.03.012

References

[1]周建萍, 王涛, 张纬舟, 等. 基于FOGI的微网不平衡负载补偿策略研究[J]. 电力系统保护与控制, 2018, 46(21): 11-17. 
ZHOU J P, WANG T, ZHANG W Z, et al. Research on compensation strategy of unbalanced load of microgrid based on FOGI[J]. Power System Protection and Control, 2018, 46(21):11-17. (in Chinese)
[2]张忠, 王建学, 刘世民. 计及网络拓扑下微电网有功 调节对电压控制的适应性分析[J]. 电力自动化设备, 2017, 37(4): 22-29. 
ZHANG Z, WANG J X, LIU S M. Adaptability of active-power adjustment to voltage control considering network topology of microgrid[J]. Electric Power Automation Equipment, 2017, 34(2):22-29. (in Chinese)
[3]刘平, 刘美琦, 苗轶如, 等. 基于LCC的三相四线制逆变器特性分析与控制[J]. 电力自动化设备, 2023, 43(2): 104-111.
LIU P, LIU M Q, MIAO Y R, et al. Analysis and control of three-phase four-wire inverter Based on LCC[J]. Electrical Power Automation Equipment, 2023, 43(2): 104-111. (in Chinese)
[4]段晓丽. 三相逆变器输出电压不平衡的控制研究[D]. 哈尔滨:哈尔滨工程大学, 2011. 
DUAN X L. Research on the control of unbalanced voltage output of three-phase inverter[D]. Harbin: Harbin Engineering University, 2011. (in Chinese)
[5]WU Y Y, LIU G C, CHEN G W, et al. Sliding mode control strategy of grid-connected inverter under unbalanced grid voltage[C]//2022 IEEE 5th International Electrical and Energy Conference (CIEEC).Nanjing:IEEE,2022: 410-416.
[6]刘海春, 费涛, 温鹏召, 等. 基于LCL滤波的400 Hz逆变器并联控制[J]. 电机与控制学报, 2021, 25(9):26-34. 
LIU H C, FEI T, WEN P Z, et al. Parallel control of 400 Hz inverter based on LCL filter[J]. Electric Machines and Control, 2021, 25(9):26-34. (in Chinese)
[7]HE L Q, ZHANG K, XIONG J, et al. A repetitive control scheme for harmonic suppression of circulating current in modular multilevel converters[J]. IEEE Transactions on Power Electronics, 2015, 30(1):471-481.
[8]张纯江, 郭忠南, 骈帅华, 等. 逆变器系统中准PCI控制器及其物理模型分析[J]. 电工技术学报, 2017, 32(24):115-125.
ZHANG C J, GUO Z N, PIAN S H, et al. Analysis of quasi-PCI controller and its physical model in inverter system[J]. Transactions of China Electrotechnical Society, 2017, 32(24):115-125. (in Chinese)
[9]LI H R, WAN C Y, LIU Y H, et al. Fault-tolerant control strategy based on quasi-proportional complex integration controller for five-phase PMSM under coil inter-turn short circuit fault condition[C]//2023 26th International Conference on Electrical Machines and Systems (ICEMS).Zhuhai:IEEE,2023:2210-2215.
[10]杨浩, 宋国杰, 滕馥遥, 等. 单相并网逆变器自适应比例复数积分控制策略[J]. 高电压技术, 2020, 46(11):3790-3799.
YANG H, SONG G J, TENG F Y, et al. Adaptive proportional complex integral control strategy for single-phase grid-connected inverters[J]. High Voltage Technology, 2020, 46(11):3790-3799. (in Chinese)
[11] DAS S K,MOHARANA J K, SYAM P. Control of indirect matrix converter using an optimized 2DOF-FOPID-FF Controller under unbalanced grid voltage condition[C]//2023 3rd Asian Conference on Innovation in Technology (ASIANCON), Ravet IN:IEEE,2023.
[12] 何宇, 喻永康, 罗琦. 三相并网逆变器的分数阶PCI控制技术[J]. 电力系统及其自动化学报, 2023, 35(06):30-37.
HE Y, YU Y K, LUO Q. Fractional PCI control technology for three-phase grid-connected inverters[J]. Journal of Electric Power Systems and Automation, 2023, 35(6):30-37. (in Chinese)
[13] XU J H, LI X C, LIU H. et al. Fractional-order modeling and analysis of a three-Phase voltage source PWM rectifier[J]. IEEE Access,2020,8:13507-13515.
[14] LIN D, LIAO X Z, DONG L, et al. Experimental study of fractional-order RC circuit model using the Caputo and Caputo-Fabrizio derivatives[J]. IEEE Transactions on Circuits and Systems I: Regular Papers, 2021, 68(3): 1034-1044.
[15] LONG B, HU C K, CHEN Z H, et al. Fractional-order sequential model predictive control of three-phase fractional-order T-type converters[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2023, 11(6):5820-5832.
[16] XIE F, YANG Z Q, Chen. Y, et al. Construction and experimental realization of the fractional-order transformer by oustaloup rational approximation method[J]. IEEE Transactions on Circuits and Systems II: Express Briefs, 2023, 70(4):1550-1554.
[17] TZOUNAS G, DASSIOS I,MURAD M A A, et al.Theory and implementation of fractional order controllers for power system applications[J]. IEEE Transactions on Power Systems, 2020,35(6):4622-4631. 
[18] QU Z W, YAO Y X, WANG Y J, et al. A novel unbalance compensation method for distribution solid-state transformer based on reduced order generalized integrator[J]. IEEE Access, 2019,7:108593-108603.
[19] GUO J, MENG Z Q, CHEN Y D, et al. Harmonic transfer-function-based αβ-frame SISO impedance modeling of droop inverters-based islanded microgrid with unbalanced loads[J]. IEEE Transactions on Industrial Electronics, 2023,70(1):452-464.
[20] LI D R, SU Y, WANG L, et al. Power flow models of grid-forming inverters in unbalanced distribution grids[J]. IEEE Transactions on Power Systems, 2024,39(2):4311-4322.
[21] LYU M Z, MAN C X, ZHOU T. Mid-point potential balancing in three-level inverters[J]. Journal of Physics: Conference Series,2023, 2479: 012023.

Outlines

/