直流微电网中多端口隔离型DC-DC变换器的改进虚拟电容控制策略

doi:10.19595/j.cnki.1000-6753.tces.191700

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摘要

针对直流微电网惯性低、母线电压质量较差的问题,考虑当前分布式微源对高升/降压比、电气隔离以及高效率变换器的急切需求,提出一种多端口隔离型DC-DC变换器（MPIC）的改进虚拟电容（IVC）控制策略。首先,采用MPIC取代传统的Buck-Boost电路,实现储能系统内部微源相互电气隔离;其次,通过类比交流微电网中虚拟同步电机的调频控制,得到适用于MPIC的IVC控制;然后,建立其IVC控制下储能接口变换器（ESC）的小信号模型,深入分析负载扰动下直流母线电压的动态特性,针对扰动过程中产生的电压过冲现象,采用前馈补偿予以消除,并给出电压跟踪系数、虚拟电容和阻尼系数等参量的整定方法;最后,仿真和实验结果验证了所提控制策略的有效性和正确性。

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	张辉
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关键词 ：直流微电网, 惯性, 改进虚拟电容控制, 多端口变换器

Abstract：

At present, distributed micro-source has urgent demand for high up/down ratio, electrical isolation and high efficiency converter. Aiming at the low inertia of DC microgrid and poor bus voltage quality, an improved virtual capacitor (IVC) control strategy for a multi-port isolated DC-DC converter (MPIC) is proposed. Firstly, MPIC is used to replace the traditional Buck-Boost circuit to achieve the electrical isolation of the micro sources inside the energy storage system. Secondly, through analog frequency modulation control of the virtual synchronous generator in the AC microgrid, IVC control suitable for MPIC is obtained. Then a small signal model of the energy storage interface converter (ESC) under its IVC control is established, and the dynamic characteristics of the DC bus voltage under load disturbance are analyzed in depth. The voltage overshoot phenomenon generated during the disturbance process is eliminated by feedforward compensation, and the parameters such as voltage tracking coefficient, virtual capacitance and damping coefficient are given. Finally, simulation and experimental results verify the proposed control strategy.

Key words： DC microgrid inertia improved virtual capacitor control multi-port converter

收稿日期: 2019-12-06

PACS:

TM721

基金资助:

国家自然科学基金面上项目（51877117,51877175）、陕西省重点研发计划资助项目（2017ZDXM-GY-003）、陕西省自然科学基金项目（2017JM5100）、台达电力电子科教发展计划重大项目（DREM2019005）和电力系统及发电设备控制与仿真国家重点实验室（SKLD18M06）资助

通讯作者: 孙凯男,1977年生,研究员,博士生导师,主要研究方向为新能源发电与微电网系统中的电力电子技术。E-mail: sun-kai@mail.tsinghua.edu.cn

作者简介: 张辉男,1963年生,教授,博士生导师,主要研究方向为微电网运行控制与新型电力储能及电动汽车驱动/充电。E-mail: zhangh@xaut.edu.cn

引用本文:

张辉, 梁誉馨, 孙凯, 陈欢, 杜明桥. 直流微电网中多端口隔离型DC-DC变换器的改进虚拟电容控制策略[J]. 电工技术学报, 2021, 36(2): 292-304. Zhang Hui, Liang Yuxin, Sun Kai, Chen Huan, Du Mingqiao. Improved Virtual Capacitor Control Strategy of Multi-Port Isolated DC-DC Converter in DC Microgrid. Transactions of China Electrotechnical Society, 2021, 36(2): 292-304.

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[1] M Zahid Z U, Dalala Z M, Chen R, et al. Design of bidirectional DC-DC resonant converter for vehicle- grid (V2G) applications[J]. IEEE Transactions on Transportation Electrification, 2015, 1(3): 232-244.
[2] Jung J H, Kim H S, Ryu M H, et al.Design methodology of bidirectional CLLC resonant con- verter for high-frequency isolation of DC distribution systems[J]. IEEE Transactions on Power Electronics, 2013, 28(4): 1741-1755.
[3] Inoue S, Akagi H.A bidirectional DC-DC converter for an energy storage system with galvanic isola- tion[J]. IEEE Transactions on Power Electronics, 2007, 22(6): 2299-2306.
[4] Zhao Biao, Song Qiang, Liu Wenhua.et al.Power characterization of isolated bidirectional dual-active- bridge DC-DC converter with dual-phase-shift control[J]. IEEE Transactions on Power Electronics, 2012, 27(9): 4172-4176.
[5] 王盼宝, 王卫, 孟尼娜, 等. 直流微电网离网与并网运行统一控制策略[J]. 中国电机工程学报, 2015, 35(17): 4388-4396.
Wang Panbao, Wang Wei, Meng Nina, et al.Unified control strategy for off-grid and grid-connected operation of DC microgrid[J]. Proceedings of the CSEE, 2015, 35(17): 4388-4396.
[6] 肖湘宁, 王鹏, 陈萌. 基于分布式多代理系统的孤岛微电网二次电压控制策略[J]. 电工技术学报, 2018, 33(8): 1894-1902.
Xiao Xiangning, Wang Peng, Chen Meng.Secondary voltage control strategy of island microgrid based on distributed multi-agent system[J]. Transactions of China Electrotechnical Society, 2018, 33(8): 1894-1902.
[7] Soni N, Doolla S, Chandorkar M C.Improvement of transient response in microgrids using virtual inertia[J]. IEEE Transactions on Power Delivery, 2013, 28(3): 1830-1838.
[8] 张曦, 张宁, 龙飞, 等. 分布式电源接入配网对其静态电压稳定性影响多角度研究[J]. 电力系统保护与控制, 2017, 45(6): 120-125.
Zhang Xi, Zhang Ning, Long Fei, et al.Research of the impacts on static voltage stability of distribution networks with distributed generation from different aspects[J]. Power System Protection and Control, 2017, 45(6): 120-125.
[9] Dragicevic T, Guerrero J M, Vasquez J C, et al.Supervisory control of an adaptive-droop regulated DC microgrid with battery management capability[J]. IEEE Transactions on Power Electronics, 2013, 29(2): 695-706.
[10] 刘宿城, 甘洋洋, 刘晓东, 等. 超级电容接口双向DC-DC变换器的电压快恢复控制策略[J]. 电工技术学报, 2018, 33(23): 110-122.
Liu Sucheng, Gan Yangyang, Liu Xiaodong, et al.Voltage fast recovery control strategy of bidirectional DC-DC converter with supercapacitor interface[J]. Transactions of China Electrotechnical Society, 2018, 33(23): 110-122.
[11] 李微, 周雪松, 马幼捷, 等. 三端口直流微网母线电压控制器及多目标控制[J]. 电工技术学报, 2019, 34(1): 96-106.
Li Wei, Zhou Xuesong, Ma Youjie, et al.Three-port DC microgrid bus voltage controller and multi-target control[J]. Transactions of China Electrotechnical Society, 2019, 34(1): 96-106.
[12] Wu Wenhua, Chen Yandong, Luo An, et al.A virtual inertia control strategy for DC microgrids analogized with virtual synchronous machines[J]. IEEE Transa- ctions on Industrial Electronics, 2017, 64(7): 6005-6016.
[13] 孟建辉, 邹培根, 王毅, 等. 基于灵活虚拟惯性控制的直流微网小信号建模及参数分析[J]. 电工技术学报, 2019, 34(12): 2615-2626.
Meng Jianhui, Zou Peigen, Wang Yi, et al.Small signal modeling and parameter analysis of DC microgrid based on flexible virtual inertia control[J]. Transactions of China Electrotechnical Society, 2019, 34(12): 2615-2626.
[14] 孟建辉, 宋美琪, 王毅, 等. 虚拟电容控制下并网型直流微网VSC多约束稳定运行边界[J]. 电力系统自动化, 2019, 43(15): 172-179.
Meng Jianhui, Song Meiqi, Wang Yi, et al.VSC multi-constrained stable operation boundary of grid- connected DC microgrid under virtual capacitor control[J]. Automation of Electric Power Systems, 2019, 47(15): 172-179.
[15] Guo Yu, Ma Weiwei, Meng Jianhui, et al.A virtual inertia control strategy for dual active bridge DC-DC converter[C]// 2018 IEEE 2nd Conference on Energy Internet and Energy System Integration (EI2), Beijing, 2018: 1-5.
[16] 于明, 王毅, 李永刚. 基于预测方法的直流微网混合储能虚拟惯性控制[J]. 电网技术, 2017, 41(5): 182-188.
Yu Ming, Wang Yi, Li Yonggang.Virtual inertial control of hybrid energy storage in DC microgrid based on prediction method[J]. Power System Tech- nology, 2017, 41(5): 182-188.
[17] 王毅, 黑阳, 付媛, 等. 基于变下垂系数的直流配电网自适应虚拟惯性控制[J]. 电力系统自动化, 2017, 41(8): 116-124.
Wang Yi, Hei Yang, Fu Yuan, et al.Adaptive virtual inertial control of DC distribution network based on variable droop coefficient[J]. Automation of Electric Power Systems, 2017, 41(8): 116-124.
[18] 张辉, 张凯涛, 肖曦, 等. 模拟直流发电机特性的储能变换器控制策略[J]. 电力系统自动化, 2017, 41(20): 132-138.
Zhang Hui, Zhang Kaitao, Xiao Xi, et al.Control strategy of energy storage converter for simulating DC generator characteristics[J]. Automation of Electric Power Systems, 2017, 41(20): 132-138.
[19] 张辉, 谭树成, 肖曦, 等. 具有直流电机特性的储能接口变换器控制策略[J]. 高电压技术, 2018, 44(1): 119-125.
Zhang Hui, Tan Shucheng, Xiao Xi, et al.Control strategy of energy storage interface converter with DC motor characteristics[J]. High Voltage Techno- logy, 2018, 44(1): 119-125.
[20] Soumya S, Prakash M J, Krishna R B.Virtual DC machine: an inertia emulation and control technique for a bidirectional DC-DC converter in a DC micro- grid[J]. IET Electric Power Applications, 2018, 12(6): 874-884.
[21] 朱晓荣, 孟凡奇, 谢志云. 基于虚拟同步发电机的直流微网DC-DC变换器控制策略[J]. 电力系统自动化, 2019, 43(21): 132-140.
Zhu Xiaorong, Meng Fanqi, Xie Zhiyun.Control strategy of DC micro-grid DC-DC converter based on virtual synchronous generator[J]. Automation of Electric Power Systems, 2019, 43(21): 132-140.
[22] 李鹏程, 张纯江, 阚志忠, 等.软开关高增益Buck- Boost集成CLLC型直流双向变换器[J]. 中国电机工程学报, 2018, 38(11): 3295-3305.
Li Pengcheng, Zhang Chunjiang, Kan Zhizhong, et al.Soft-switching high gain Buck-Boost integrated CLLC DC bidirectional converter[J]. Proceedings of the CSEE, 2018, 38(11): 3295-3305.
[23] 林维明, 郭晓君, 黄超. 改进单周期控制策略的双向大变比DC-DC开关变换器[J]. 中国电机工程学报, 2012, 32(21): 31-37.
Lin Weiming, Guo Xiaojun, Huang Chao.Two-way large-ratio DC-DC switching converter with improved single-cycle control strategy[J]. Proceedings of the CSEE, 2012, 32(21): 31-37.
[24] 于德, 付超, 王毅, 等. 隔离型双向直流变换器的最小回流功率移相控制方法[J]. 电工技术学报, 2017, 32(24): 126-138.
Yu De, Fu Chao, Wang Yi, et al.Minimum return power phase shift control method for isolated bidire- ctional DC converters[J]. Transactions of China Electrotechnical Society, 2017, 32(24): 126-138.
[25] Saravanan S, Babu N R.A modified high step-up non-isolated DC-DC converter for PV application[J]. Journal of Applied Research & Technology, 2017, 15(3): S166564231730041X.
[26] Lin Xiang, Sun Kai, Lin Jin, et al.A multi-port bidirectional power conversion system for reversible solid oxide fuel cell applications[C]//2018 Inter- national Power Electronics Conference, Niigata, 2018: 3460-3465.
[27] 陶银正, 蒲道杰, 毛福斌. 虚拟同步发电机技术及其在光储微电网中的应用[J]. 电气技术, 2016, 17(11): 36-40.
Tao Yinzheng, Pu Daojie, Mao Fubin.Virtual syn- chronous generator technology and its application in optical storage microgrid[J]. Electrical Technology, 2016, 17(11): 36-40.
[28] 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): 2591-2603.
Lü Zhipeng, Sheng Wanxing, Zhong Qingchang, et al.Virtual synchronous generator and its application in microgrid[J]. Proceedings of the CSEE, 2014, 34(16): 2591-2603.
[29] 张辉, 宋琼, 魏亚龙. 离网运行的多微源微网调频调压控制策略[J]. 高电压技术, 2017, 43(1): 155-162.
Zhang Hui, Song Qiong, Wei Yalong.Multi-micro- source micro-grid voltage regulation and control strategy for off-grid operation[J]. High Voltage Engineering, 2017, 43(1): 155-162.