改进VSG的低压微电网无功功率均分控制策略*

doi:10.11985/2023.04.027

电气工程学报 ›› 2023, Vol. 18 ›› Issue (4): 251-259.doi: 10.11985/2023.04.027

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改进VSG的低压微电网无功功率均分控制策略^*

王清璇¹(), 孙宁²(), 薛亚辉³, 李斌²

1.焦作大学人工智能学院焦作 454000
2.河南理工大学电气工程及其自动化学院焦作 454003
3.焦作大学信息工程学院焦作 454000

收稿日期:2022-11-03 修回日期:2023-04-03 出版日期:2023-12-25 发布日期:2024-01-12
通讯作者: 孙宁，男，1995年生，硕士研究生。主要研究方向为电力电子与电气传动。E-mail：sunnings02@163.com
作者简介:王清璇，女，1986年生，硕士。主要研究方向为智能控制和数据处理技术。E-mail：5713304@qq.com
基金资助:
*河南省科技攻关(232102240036);河南理工大学基础研究(NSFRF230616)

Reactive Power Equalization Control Strategy of VSG Improved by Low Voltage Microgrid

WANG Qingxuan¹(), SUN Ning²(), XUE Yahui³, LI Bin²

1. School of Artificial Intelligence, Jiaozuo University, Jiaozuo 454000
2. School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454003
3. School of Information Engineering, Jiaozuo University, Jiaozuo 454000

Received:2022-11-03 Revised:2023-04-03 Online:2023-12-25 Published:2024-01-12

摘要/Abstract

摘要：

由于低压微电网线路阻抗的差异，虚拟同步发电机(Virtual synchronous generator，VSG)并联运行中存在的功率耦合会导致功率分配不均与系统环流。首先分析并联等效电路中功率耦合的原因，说明功角与阻抗角都会对功率耦合产生重要影响，对此提出了一种改进VSG的无功功率均分控制策略，在虚拟阻抗改变量中加入功角补偿项来修正虚拟阻抗的值，该控制策略可以较好地实现功率均分以及减小系统环流。对于虚拟阻抗导致电压降落的问题，在无功环路中增加电压补偿项，提高了逆变器输出电压的幅值。最后，建立了整体闭环系统传递函数来保证系统的稳定性和动态性能，在Matlab/Simulink中搭建了两台VSG验证了所提控制策略的可行性。

关键词: VSG并联, 虚拟阻抗, 系统环流, 功角补偿, 电压补偿

Abstract:

Due to the difference in line impedance of low-voltage microgrid, the power coupling existing in parallel operation of virtual synchronous generator(VSG) will lead to uneven power distribution and circulation current. Firstly, the cause of power coupling in parallel equivalent circuit are analyzed, and it is shown that both power angle and impedance angle will have an important impact on power coupling. For this reason, a reactive power sharing control strategy is proposed to improve VSG, and power angle compensation is added to the virtual impedance change to correct the value of virtual impedance. This control strategy can realize power sharing better and reduce circulation current. For the problem of voltage drop caused by virtual impedance, the voltage compensation term is added in the reactive power loop to increase the voltage amplitude and improve the power quality of the inverter output voltage. Finally, the overall closed-loop system output impedance transfer function is established to ensure the stability and dynamic performance of the system. Two VSGs are built in Matlab/Simulink to verify the feasibility of the proposed control strategy.

Key words: VSG parallel connection, virtual impedance, circulation current, power angle compensation, voltage compensation

中图分类号:

TM561

王清璇, 孙宁, 薛亚辉, 李斌. 改进VSG的低压微电网无功功率均分控制策略^*[J]. 电气工程学报, 2023, 18(4): 251-259.

WANG Qingxuan, SUN Ning, XUE Yahui, LI Bin. Reactive Power Equalization Control Strategy of VSG Improved by Low Voltage Microgrid[J]. Journal of Electrical Engineering, 2023, 18(4): 251-259.

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参考文献 21

[1]	杨新法, 苏剑, 吕志鹏, 等. 微电网技术综述[J]. 中国电机工程学报, 2014, 34(1):57-70.
	YANG Xinfa, SU Jian, LÜ Zhipeng, et al. Overview on micro-grid technology[J]. Proceedings of the CSEE, 2014, 34(1):57-70.
[2]	BRABANDERE K D, BOLSENS B, KEYBUS J, et al. A voltage and frequency droop control method for parallel inverters[J]. IEEE Transactions on Power Electronics, 2007, 22(4):1107-1115. doi: 10.1109/TPEL.63
[3]	KERDPHOL T, WATANABE M, HONGESOMBUT K, et al. Self-adaptive virtual inertia control-based fuzzy logic to improve frequency stability of microgrid with high renewable penetration[J]. IEEE Access, 2019, 7(1):76071-76083. doi: 10.1109/Access.6287639
[4]	CHE L, SHAHIDEHPOUR M, ALABDULWAHAB A, et al. Hierarchical coordination of a community microgrid with AC and DC microgrids[J]. IEEE Transactions on Smart Grid, 2015, 6(6):3042-3051. doi: 10.1109/TSG.2015.2398853
[5]	LIU Jia, MIURA Y, ISE T. Comparison of dynamic characteristics between virtual synchronous generator and droop control in inverter-based distributed generators[J]. IEEE Transactions on Power Electronics, 2016, 31(5):3600-3611. doi: 10.1109/TPEL.2015.2465852
[6]	ZHONG Qingchang, WEISS G. Synchronverters:Inverters that mimic synchronous generators[J]. IEEE Transactions on Industrial Electronics, 2011, 58(4):1259-1267. doi: 10.1109/TIE.2010.2048839
[7]	TANG Shuai, WANG Weijun, LI Shu, et al. Research on control technology of distributed power generation virtual synchronous generator[J]. IOP Conference Series:Earth and Environmental Science, 2021, 657(1):012083. doi: 10.1088/1755-1315/657/1/012083
[8]	WU Teng, LIU Zeng, LIU Jinjun, et al. A unified virtual power decoupling method for droop-controlled parallel inverters in microgrids[J]. IEEE Transactions on Power Electronics, 2016, 31(8):5587-5603. doi: 10.1109/TPEL.2015.2497972
[9]	张平, 石健将, 李荣贵, 等. 低压微网逆变器的“虚拟负阻抗”控制策略[J]. 中国电机工程学报, 2014, 34(12):1844-1852.
	ZHANG Ping, SHI Jianjiang, LI Ronggui, et al. A control strategy of ‘virtual negative’ impedance for inverters in low-voltage microgrid[J]. Proceedings of the CSEE, 2014, 34(12):1844-1852.
[10]	白小丹, 苗虹, 曾成碧, 等. 适用于低压微网中逆变器无功均分的改进下垂控制策略[J]. 高电压技术, 2020, 46(4):1310-1318.
	BAI Xiaodan, MIAO Hong, ZENG Chengbi, et al. Improved droop control strategy for reactive power sharing of inverters in low-voltage microgrids[J]. High Voltage Engineering, 2020, 46(4):1310-1318.
[11]	王俊凯, 牟龙华, 刘鑫. 基于动态虚拟阻抗的多并联逆变器间环流抑制控制策略[J]. 电力自动化设备, 2021, 41(4):94-100.
	WANG Junkai, MOU Longhua, LIU Xin. Control strategy based on dynamic virtual impedance to suppress circulating current between multiple parallel inverters[J]. Power Automation Equipment, 2021, 41(4):94-100.
[12]	屈子森, 蔡云旖, 杨欢, 等. 基于自适应虚拟阻抗的虚拟同步机功率解耦控制策略[J]. 电力系统自动化, 2018, 42(17):58-66.
	QU Zisen, CAI Yunyi, YANG Huan, et al. Strategy of power decoupling control for virtual synchronous generators based on adaptive virtual impedance[J]. Automation of Electric Power Systems, 2018, 42(17):58-66.
[13]	PENG Zishun, WANG Jun, WEN Yeting, et al. Virtual synchronous generator control strategy incorporating improved governor control and coupling compensation for AC microgrid[J]. IET Power Electronics, 2019, 12(6):1455-1461. doi: 10.1049/iet-pel.2018.6167
[14]	CHEEMA K M, MILYANI A H, EL-SHERBEENY A M, et al. Modification in active power-frequency loop of virtual synchronous generator to improve the transient stability[J]. International Journal of Electrical Power & Energy Systems, 2021, 128:106668. doi: 10.1016/j.ijepes.2020.106668
[15]	李小强, 伍小杰, 耿乙文, 等. 感性电网阻抗下三相光伏逆变器稳定性分析[J]. 中国电机工程学报, 2014, 34(18):2906-2916.
	LI Xiaoqiang, WU Xiaojie, GENG Yiwen, et al. Stability analysis of three-phase PV inverter under inductive grid impedance condition[J]. Proceedings of the CSEE, 2014, 34(18):2906-2916.
[16]	孟建辉, 王毅, 石新春, 等. 基于虚拟同步发电机的分布式逆变电源控制策略及参数分析[J]. 电工技术学报, 2014, 29(12):1-10.
	MENG Jianhui, WANG Yi, SHI Xinchun, et al. Control strategy and parameter analysis distributed inverters based on VSG[J]. Transactions of China Electrotechnical Society, 2014, 29(112):1-10.
[17]	LI Bin, ZHOU Lin. Power decoupling method based on the diagonal compensating matrix for VSG-controlled parallel inverters in the microgrid[J]. Energies, 2017, 10(12):2159. doi: 10.3390/en10122159
[18]	张也, 颜湘武. 微网功率耦合特性分析及解耦控[J]. 电网技术, 2016, 40(3):812-818.
	ZHANG Ye, YAN Xiangwu. Coupling analysis and decoupling control of microgrid power[J]. Power System Technology, 2016, 40(3):812-818.
[19]	陈杰, 刘名凹, 陈新, 等. 基于下垂控制的逆变器无线并联与环流抑制技术[J]. 电工技术学报, 2018, 33(7):1450-1460.
	CHEN Jie, LIU Mingao, CHEN Xin, et al. Wireless parallel and circulation current reduction of droop-controlled inverters[J]. Transactions of China Electrotechnical Society, 2018, 33(7):1450-1460.
[20]	ZHANG Jiyuan, SHU Jie, NING Jia, et al. Enhanced proportional power sharing strategy based on adaptive virtual impedance in low-voltage networked microgrid[J]. IET Generation Transmission & Distribution, 2018, 12(11):2566-2576. doi: 10.1049/gtd2.v12.11
[21]	REN Mingwei, LI Tong, SHI Kai, et al. Coordinated control strategy of virtual synchronous generator based on adaptive moment of inertia and virtual impedance[J]. IEEE Journal on Emerging and Selected Topics in Circuits and Systems, 2021, 11(1):99-110. doi: 10.1109/JETCAS.5503868

参数	数值
转动惯量J/(kg·m²)	0.2
阻尼系数D	10
无功环参数D_p	2.5×10^-3
VSG1额定输出功率 VSG2额定输出功率有功负荷P/kW 无功负荷Q/kVar 线路阻抗Z_line1 线路阻抗Z_line2	10 kW+5 kVar 10 kW+5 kVar 10 5 0.64+j0.314 Ω 0.5+j0.5 Ω

改进VSG的低压微电网无功功率均分控制策略^*

Reactive Power Equalization Control Strategy of VSG Improved by Low Voltage Microgrid

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