阮景阳,徐利佶,王龙悦,胡鹏飞,汤波
RUAN Jingyang,XU Liji,WANG Longyue,HU Pengfei,TANG Bo

• 1:上海电力大学电气工程学院
• 2:浙江大学电气工程学院

摘要(Abstract)：

针对非隔离型柔性互联装置在不平衡工况下谐波含量高、模式切换慢的问题，开展低压柔性互联系统优化控制研究。首先，构建基于中点箝位三电平变流器的非隔离型柔性互联装置拓扑，通过坐标变换与建模分析，建立融合αβ轴电压、零序电流、电容电压及共模电流的六维离散预测模型。进而，提出基于模型预测控制的统一优化控制策略，基于模型预测控制设计多目标动态代价函数，引入权重自适应调整机制，实现对直流电压优化、功率精确跟踪、零序电流抑制与共模电流抑制的协同控制。最后，通过多工况仿真验证策略的有效性，结果表明，该控制策略可显著提升系统动态响应能力、极端工况适应性与稳态控制精度，为低压柔性互联装备工程化应用提供技术参考。
To address challenges such as high harmonic content and sluggish mode switching in non-isolated flexible interconnection devices(FIDs) under unbalanced conditions, this paper investigates the optimized control of lowvoltage flexible interconnection systems. First, a non-isolated FID topology based on a neutral-point clamped(NPC) three-level converter is established. Through coordinate transformation and mathematical modeling, a sixdimensional discrete predictive model is constructed, which integrates αβ-axis voltages, zero-sequence current, capacitor voltages, and common-mode current. Subsequently, a unified optimal control strategy based on model predictive control(MPC) is proposed. A multi-objective dynamic cost function is designed with an adaptive weighting mechanism to achieve coordinated regulation of DC voltage optimization, precise power tracking, and the simultaneous suppression of zero-sequence and common-mode currents. Finally, simulations across various operating conditions validate the effectiveness of the proposed strategy. The results demonstrate that the control strategy significantly enhances dynamic response, adaptability to extreme conditions, and steady-state control precision, providing a technical support for the industrial application of low-voltage flexible interconnection devices.

关键词(KeyWords)： 非隔离型;柔性互联;模型预测控制;统一优化控制
non-isolated;flexible interconnection;model predictive control;unified optimal control

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金国网联合基金重点项目（U2166204）

作者(Author): 阮景阳,徐利佶,王龙悦,胡鹏飞,汤波
RUAN Jingyang,XU Liji,WANG Longyue,HU Pengfei,TANG Bo

DOI: 10.19585/j.zjdl.202607012

参考文献(References)：

• [1]彭词，胡丽蕊，张黎明，等.基于分布式VSG的微电网自适应阻尼控制[J].电力电子技术，2023,57(5):85-88.Peng Ci,Hu Lirui,Zhang Liming,et al.Adaptive damping control of micro-grid based on distributed VSG[J].Power Electronics,2023,57(5):85-88.
• [2]喻恒凝，黄力，张思东，等.分布式光伏和电动汽车接入对配电网网损和电压偏移影响的分析研究[J].智慧电力，2020,48(1):28-34.Yu Hengning,Huang Li,Zhang Sidong,et al.Effects of distributed photovoltaic generation and electric vehicle integrating into distribution network on line loss and voltage drift[J].Smart Power,2020,48(1):28-34.
• [3]王成山，宋关羽，李鹏，等.基于智能软开关的智能配电网柔性互联技术及展望[J].电力系统自动化，2016,40(22):168-175.Wang Chengshan,Song Guanyu,Li Peng,et al.Research and prospect for soft open point based flexible interconnection technology for smart distribution network[J].Automation of Electric Power Systems,2016,40(22):168-175.
• [4]郁家麟，肖龙海，江明强，等.主动配电网关键技术在光伏高渗透工业新区电网的应用[J].浙江电力，2020,39(5):74-81.Yu Jialin,Xiao Longhai,Jiang Mingqiang,et al.Application of key technologies of ADN in local power grid with high PV penetration in high-tech industrial zone[J].Zhejiang Electric Power,2020,39(5):74-81.
• [5]李岩，陈夏，李巍巍，等.基于智能软开关与联络开关并联的柔性配电网互联结构与控制技术研究[J].中国电机工程学报，2022,42(13):4749-4759.Li Yan,Chen Xia,Li Weiwei,et al.Research on interconnection structure and control technology of flexible distribution network based on soft open point in parallel with interconnection switch[J].Proceedings of the CSEE,2022,42(13):4749-4759.
• [6] Vazquez S,Rodriguez J,Rivera M,et al.Model predictive control for power converters and drives:advances and trends[J].IEEE Transactions on Industrial Electronics,2017,64(2):935-947.
• [7]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.
• [8]刘乐.弱电网下并网逆变器的稳定性分析及增强控制[D].西安：西安理工大学，2018.Liu Le.Stability analysis and enhancing control strategy of grid-connected inverter under weak grid[D].Xi’an:Xi’an University of Technology,2018.
• [9]赵磊磊，牟伟，宋慧庆，等.适用于弱电网的三电平并网逆变器模型预测控制[J].浙江电力，2024,43(6):61-68.Zhao Leilei,Mu Wei,Song Huiqing,et al.Model predictive control of three-level grid-connected inverters for weak power grids[J].Zhejiang Electric Power,2024,43(6):61-68.
• [10] Stellato B,Geyer T,Goulart P J.High-speed finite control set model predictive control for power electronics[J].IEEE Transactions on Power Electronics,2017,32(5):4007-4020.
• [11] Saadatmand S,Shamsi P,Ferdowsi M.The voltage regulation of a buck converter using a neural network predictive controller[C]//2020 IEEE Texas Power and Energy Conference(TPEC).February 6-7,2020,College Station,TX,USA.IEEE,2020:1-6.
• [12]孙承章，任永峰，云平平，等.基于MPC的构网型柔直受端换流站主动频率支撑研究[J].太阳能学报，2025,46(6):401-409.Sun Chengzhang,Ren Yongfeng,Yun Pingping,et al.Research on active frequency support for grid-forming flexible direct receiving end converter station based on model predictive control[J].Acta Energiae Solaris Sinica,2025,46(6):401-409.
• [13]李帅虎，向丽珍，向振宇，等.用于改善VSG频率响应的模型预测控制方法[J].高电压技术，2021,47(8):2856-2864.Li Shuaihu,Xiang Lizhen,Xiang Zhenyu,et al.MPC control method for improving VSG frequency response[J].High Voltage Engineering,2021,47(8):2856-2864.
• [14]陶奕嘉，杨秀，张美霞，等.基于MPC的直流微电网混合储能改进下垂控制策略研究[J].智慧电力，2024,52(11):89-97.Tao Yijia,Yang Xiu,Zhang Meixia,et al.Improved droop control strategy for hybrid energy storage in DC micro grid based on MPC[J].Smart Power,2024,52(11):89-97.
• [15]袁宇波，刘瑞煌，史明明，等.非隔离型低压柔性互联装置的低频地线环流产生机理及抑制策略[J].电网技术，2024,48(9):3965-3973.Yuan Yubo,Liu Ruihuang,Shi Mingming,et al.Mechanism and suppression strategy of low-frequency ground circulating current for non-isolated flexible interconnection device[J].Power System Technology,2024,48(9):3965-3973.
• [16]张锐，刘恒超，张国驹，等.基于改进供电能力指标的低压台区柔性互联装置规划[J].电力建设，2025,46(8):1-11.Zhang Rui,Liu Hengchao,Zhang Guoju,et al.Flexible interconnection device planning of low-voltage distribution station areas based on improved supply capability indicators[J].Electric Power Construction,2025,46(8):1-11.
• [17]王振浩，杜成林，庞丹，等.基于VSG-AVDG的多端柔性互联配电系统控制策略[J].智慧电力，2025,53(4):29-37.Wang Zhenhao,Du Chenglin,Pang Dan,et al.Control strategy for multi-terminal flexible interconnected distribution system based on VSG-AVDG[J]. Smart Power,2025,53(4):29-37.
• [18]邓正东，朱晓丽，段军鹏，等.基于动态权重的柔性互联配电网自适应优化调度[J].电力建设，2025,46(6):165-174.Deng Zhengdong,Zhu Xiaoli,Duan Junpeng,et al.Adaptive optimal dispatching of flexible interconnected distribution system based on dynamic weight[J].Electric Power Construction,2025,46(6):165-174.
• [19] Zhang Z B,Hackl C M,Kennel R.Computationally efficient DMPC for three-level NPC back-to-back converters in wind turbine systems with PMSG[J]. IEEE Transactions on Power Electronics,2017,32(10):8018-8034.
• [20]吕思卓，郑超，姜静雅.基于功率指令切换的双级式构网型光伏故障穿越控制策略[J].电网技术，2024,48(3):1281-1290.Lyu Sizhuo,Zheng Chao,Jiang Jingya.Fault ride-through control strategy for double-stage grid-forming photovoltaic based on power order switching[J].Power System Technology,2024,48(3):1281-1290.
• [21]钱金跃，吴佳，施文杰，等.基于SVPWM的NPC三电平逆变器简化MPC算法[J].浙江电力，2022,41(1):80-88.Qian Jinyue,Wu Jia,Shi Wenjie,et al.Simplified MPC algorithm of NPC three-level inverter based on SVPWM[J].Zhejiang Electric Power,2022,41(1):80-88.
• [22]谢鼎盛，储江伟，李红，等.基于自抗扰对电磁耦合调速器的转差控制研究[J].重庆理工大学学报（自然科学），2023,37(5):236-243.Xie Dingsheng,Chu Jiangwei,Li Hong,et al.Research on slip control of electromagnetic coupling governors based on automatic disturbance rejection[J].Journal of Chongqing University of Technology(Natural Science),2023,37(5):236-243.
• [23]曾繁明，吴晓军，赵河明，等.基于Padé近似法的零阶保持器幅频特性仿真[J].科学技术与工程，2017,17(16):275-278.Zeng Fanming,Wu Xiaojun,Zhao Heming,et al.Simulation of the amplitude-frequency characteristics of zero order holder based on padéapproximation[J].Science Technology and Engineering,2017,17(16):275-278.
• [24]齐昕，张家宁，HOLTZ Joachim，等.矩形边界限定形式的感应电机低开关频率预测控制研究[J].中国电机工程学报，2024,44(8):3278-3286.Qi Xin,Zhang Jianing,Joachim Holtz,et al.Research on low switching frequency predictive control induction motor drive based on rectangular boundary restriction[J]. Proceedings of the CSEE,2024,44(8):3278-3286.
• [25]吕志鹏，盛万兴，钟庆昌，等.虚拟同步发电机及其在微电网中的应用[J].中国电机工程学报，2014,34(16):27-30.Lyu Zhipeng,Sheng Wanxing,Zhong Qingchang,et al.Virtual synchronous generator and its applications in micro-grid[J].Proceedings of the CSEE,2014,34(16):27-30.