Flatness-Based Control of AC / DC Hybrid Microgrid Interconnected Converter

doi:10.11930/j.issn.1004-9649.202109160

Abstract

Abstract: An Interlinking Converter (ILC) control strategy based on the differential Flatness-Based Control (FBC) theory is proposed to improve the dynamic and robust performance of the hybrid AC-DC microgrid in the presence of power fluctuations and power loss. First analyzes the distributed power supply in the sub-network under the island mode. It uses the droop control strategy to solve the power distribution problem in the respective network. Secondly, it establishes the ILC mathematical model under the DQ axis and proves that the ILC system satisfies the differential flatness. Then, according to the differential flatness theory, the power controller of ILC is designed, which consists of feedforward control and error compensation. The cascade control structure is adopted in the system. The outer power loop generates the reference trajectory of balanced output, and the current inner loop generates the DQ axis voltage component of the ILC expected output. Finally, the ILC simulation system of FBC and PI control is established in Matlab / Simulink. Under three working conditions, the simulation results verify that the FBC control system has better dynamics and robustness.

Key words: islanded mode, AC / DC microgrid, interlinking converter, flatness-based control, droop control

ZHANG Yu, WANG Hongxi, WANG Pu. Flatness-Based Control of AC / DC Hybrid Microgrid Interconnected Converter[J]. Electric Power, 2022, 55(7): 102-109,120.

Add to citation manager EndNote|Ris|BibTeX

URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202109160

https://www.electricpower.com.cn/EN/Y2022/V55/I7/102

References

[1] 张国荣, 丁晓通, 彭勃, 等. 交直流混合微电网互联变流器改进控制策略[J]. 电力系统保护与控制, 2020, 48(14): 50–58
ZHANG Guorong, DING Xiaotong, PENG Bo, et al. Improved control strategy for an AC/DC hybrid microgrid interlinking converter[J]. Power System Protection and Control, 2020, 48(14): 50–58
[2] 周稳, 戴瑜兴, 毕大强, 等. 交直流混合微电网协同控制策略[J]. 电力自动化设备, 2015, 35(10): 51–57
ZHOU Wen, DAI Yuxing, BI Daqiang, et al. Coordinative control strategy for hybrid AC-DC microgrid[J]. Electric Power Automation Equipment, 2015, 35(10): 51–57
[3] 贾利虎, 朱永强, 杜少飞, 等. 交直流微电网互联变流器控制策略[J]. 电力系统自动化, 2016, 40(24): 98–104
JIA Lihu, ZHU Yongqiang, DU Shaofei, et al. Control strategy of interlinked converter for AC/DC microgrid[J]. Automation of Electric Power Systems, 2016, 40(24): 98–104
[4] LOH P C, LI D, CHAI Y K, et al. Autonomous operation of hybrid microgrid with AC and DC subgrids[J]. IEEE Transactions on Power Electronics, 2013, 28(5): 2214–2223.
[5] 唐磊, 曾成碧, 苗虹, 等. 交直流混合微电网中AC/DC双向功率变流器的新控制策略[J]. 电力系统保护与控制, 2013, 41(14): 13–18
TANG Lei, ZENG Chengbi, MIAO Hong, et al. One novel control strategy of the AC/DC bi-directional power converter in micro-grid[J]. Power System Protection and Control, 2013, 41(14): 13–18
[6] 夏祥武, 田梦瑶. 风电并网一次调频控制性能研究[J]. 电气传动, 2021, 51(5): 70–75
XIA Xiangwu, TIAN Mengyao. Research on the performance of primary frequency control of wind power grid connected[J]. Electric Drive, 2021, 51(5): 70–75
[7] GAO Z, LI C H, TENG W J, et al. Hybrid microgrid load distribution and DC voltage control[C]//2019 IEEE 3 rd Conference on Energy Internet and Energy System Integration. Changsha, China. IEEE, 2019: 1933–1937.
[8] 刘佳易, 秦文萍, 韩肖清, 等. 交直流双向功率变换器的改进下垂控制策略[J]. 电网技术, 2014, 38(2): 304–310
LIU Jiayi, QIN Wenping, HAN Xiaoqing, et al. Control method of interlink-converter in DC microgrid[J]. Power System Technology, 2014, 38(2): 304–310
[9] 谢文超, 朱永强, 杜少飞, 等. 交直流混合微电网中互联变流器功率控制[J]. 电力建设, 2016, 37(10): 9–15
XIE Wenchao, ZHU Yongqiang, DU Shaofei, et al. Power control of interlinking converter in AC/DC hybrid microgrid[J]. Electric Power Construction, 2016, 37(10): 9–15
[10] EGHTEDARPOUR N, FARJAH E. Power control and management in a hybrid AC/DC microgrid[J]. IEEE Transactions on Smart Grid, 2014, 5(3): 1494–1505.
[11] 高泽, 杨建华, 季宇, 等. 交直流混合微电网接口变换器双向下垂控制[J]. 南方电网技术, 2015, 9(5): 82–87
GAO Ze, YANG Jianhua, JI Yu, et al. Bidirectional droop control of AC/DC hybrid microgrid interlinking converter[J]. Southern Power System Technology, 2015, 9(5): 82–87
[12] 朱永强, 王福源, 赵娜, 等. 主从控制混合微电网中互联变流器控制策略[J]. 电力建设, 2018, 39(8): 102–110
ZHU Yongqiang, WANG Fuyuan, ZHAO Na, et al. Control strategy of inter-linking converter in hybrid microgrid under master-slave control[J]. Electric Power Construction, 2018, 39(8): 102–110
[13] 薛广宇. 基于虚拟同步发电机的船舶微源逆变器仿真研究[D]. 大连: 大连海事大学, 2015.
XUE Guangyu. Simulation and research on marine micro-source inverter based on the virtual synchronous generator[D]. Dalian: Dalian Maritime University, 2015.
[14] 贾利虎. 交直流混合微电网拓扑与控制策略研究[D]. 北京: 华北电力大学, 2017.
JIA Lihu. Research on topology and control strategy of the hybrid AC/DC microgrid[D]. Beijing: North China Electric Power University, 2017.
[15] 宋平岗, 朱维昌, 戈旺. 基于微分平坦理论的单相PWM整流器直接功率控制[J]. 电力系统保护与控制, 2017, 45(5): 38–44
SONG Pinggang, ZHU Weichang, GE Wang. Differential flatness based direct power control for single-phase PWM rectifier[J]. Power System Protection and Control, 2017, 45(5): 38–44
[16] 宋平岗, 陈欢, 吴继珍. 并联型有源电力滤波器功率平坦控制策略[J]. 电力电容器与无功补偿, 2017, 38(3): 19–25
SONG Pinggang, CHEN Huan, WU Jizhen. Power flatness control strategy for shunt active power filter[J]. Power Capacitor & Reactive Power Compensation, 2017, 38(3): 19–25
[17] 宋平岗, 周振邦, 林家通, 等. 基于微分平坦理论的MMC-RPC控制器设计[J]. 机车电传动, 2017(3): 14–19,37
SONG Pinggang, ZHOU Zhenbang, LIN Jiatong, et al. Design of controller for MMC-RPC based on differential flatness control theory[J]. Electric Drive for Locomotives, 2017(3): 14–19,37
[18] 周鹏辉. 基于MMC-MTDC的牵引供电系统建模及仿真研究[D]. 南昌: 华东交通大学, 2020.
ZHOU Penghui. Modelling and simulation research on traction power supply system based on MMC-MTDC[D]. Nanchang: East China Jiaotong University, 2020.
[19] SHAHIN A, HINAJE M, MARTIN J P, et al. High voltage ratio DC–DC converter for fuel-cell applications[J]. IEEE Transactions on Industrial Electronics, 2010, 57(12): 3944–3955.
[20] PAYMAN A, PIERFEDERICI S, MEIBODY-TABAR F. Energy management in a fuel cell/supercapacitor multisource/multiload electrical hybrid system[J]. IEEE Transactions on Power Electronics, 2009, 24(12): 2681–2691.