Power Control of Interlinking Converter in AC/DC Hybrid Microgrid

doi:10.3969/j.issn.1000－7229.2016.10.002

Abstract

Abstract: According to the AC/DC hybrid microgrid, this paper analyzes the droop characteristics of the subgrid in AC/DC hybrid microgrid as well as the power balance relationship between the grid-connected mode and off-grid mode. To avoid the frequency action of the converters and improve the power quality, this paper proposes a droop control method for AC/DC hybrid microgrid based on unitized processing, designs the error action threshold, derives the mathematic relationship between the unitized error and the exchange power, and realizes the partial control of the interlinking converter. The simulation model of AC/DC hybrid microgrid built in PSCAD/EMTDC shows that, in both the grid-connected mode and the off-grid mode, the interlinking converter can quickly and accurately regulate the exchange power between DC microgrid and AC microgrid, and guarantee the stable operation of AC/DC hybrid microgrid, which verifies the feasibility of the control strategy.

Key words: AC/DC hybrid microgrid, interlinking converter, hybrid droop control, error action threshold, partial

CLC Number:

TM 46

XIE Wenchao，ZHU Yongqiang，DU Shaofei，XIA Ruihua. Power Control of Interlinking Converter in AC/DC Hybrid Microgrid[J]. Electric Power Construction, 2016, 37(10): 9-.

References

［1］宗升, 何湘宁, 吴建德,等. 基于电力电子变换的电能路由器研究现状与发展［J］. 中国电机工程学报, 2015, 35(18): 4559-4570. ZONG Sheng, HE Xiangning, WU Jiande, et al. Overview of power electronics based electrical energy router［J］. Proceedings of the CSEE, 2015, 35(18): 4559-4570. ［2］王成山, 焦冰琦, 郭力, 等. 微电网规划设计方法综述［J］. 电力建设, 2015, 36(1): 38-45. WANG Chengshan, JIAO Bingqi, GUO Li, et al. Review of methods of planning and design of microgrids［J］. Electric Power Construction, 2015, 36(1): 38-45. ［3］殷晓刚, 戴冬云, 韩云, 等. 交直流混合微网关键技术研究［J］. 高压电器, 2012, 48(9): 43-46. YIN Xiaogang, DAI Dongyun, HAN Yun, et al. Discussion on key technologies of AC-DC hybrid microgrid［J］. High Voltage Apparatus, 2012, 48(9): 43-46. ［4］王成山, 肖朝霞, 王守相. 微网综合控制与分析［J］. 电力系统自动化, 2008, 32(7): 98-103. WANG Chengshan, XIAO Zhaoxia, WANG Shouxiang. Synthetical control and analysis of microgrid［J］. Automation of Electric Power Systems, 2008, 32(7): 98-103. ［5］刘进军. 电能系统未来发展趋势及其对电力电子技术的挑战［J］. 南方电网技术, 2016, 10(3): 78-81. LIU Jinjun. Future trends of power systems and their challenges to power electronics［J］. Southern Power System Technology, 2016, 10(3): 78-81. ［6］JAYAWARDENA A V, MEEGAHAPOLA L G, PERERA S, et al. Dynamic characteristics of a hybrid microgrid with inverter and non- inverter interfaced renewable energy sources: A case study［C］//2012 IEEE International Conference on Power System Technology. Auckland: IEEE, 2012: 1-6. ［7］Akbari M, Golkar M A, Tafreshi S M M. A PSO solution for improved voltage stability of a hybrid AC-DC microgrid［C］//2011 Innovative Smart Grid Technologies-India. Kollam: IEEE, 2011: 352-357. ［8］兰征, 涂春鸣, 肖凡, 等. 电力电子变压器对交直流混合微网功率控制的研究［J］. 电工技术学报, 2015, 30(23): 50-57. LAN Zheng, TU Chunming, XIAO Fan, et al. The power control of power electronic transformer in hybrid AC-DC microgrid［J］. Transactions of China Electrotechnical Society, 2015, 30(23): 50-57. ［9］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. ［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］黄杏. 微网系统并/离网特性与控制策略研究［D］. 北京: 北京交通大学, 2013 HUANG Xing. Grid-connected/islanding characteristics and control strategies of microgrid［D］. Beijing: Beijing Jiaotong University, 2013. ［12］MAJUMDER R, CHAUDHURI B, GHOSH A, et al. Improvement of stability and load sharing in an autonomous microgrid using supplementary droop control loop［C］//2010 IEEE Power and Energy Society General Meeting. Minneapolis: IEEE, 2010: 1-1. ［13］MOHAMED Y A R I, EL-SAADANY E F. Adaptive decentralized droop controller to preserve power sharing stability of paralleled inverters in distributed generation microgrids［J］. IEEE Transactions on Power Electronics, 2008, 23(6): 2806-2816. ［14］彭勇, 李倩. 微电网并网运行时的电压稳定控制［J］. 电力建设, 2014, 35(6): 56-62. PENG Yong, LI Qian. Voltage Stability control of grid-connected microgrid［J］. Electric Power Construction, 2014, 35(6): 56-62. ［15］ZHANG J L, GUO D K, WANG F P, et al. Control strategy of interlinking converter in hybrid AC/DC microgrid［C］//2013 International Conference on Renewable Energy Research and Applications. Madrid: IEEE, 2013: 97-102. ［16］刘佳易. 交直流混合微电网中双向AC/DC功率变换器控制策略研究［D］. 太原：太原理工大学, 2014. LIU Jiayi. Research on the control method of interlink-converter in hybrid microgrid［D］. Taiyuan: Taiyuan University of Technology, 2014.

[1]	ZHU Yongqiang,ZHANG Quan,LIU Kang,WANG Zhi， HAN Minxiao. A New Control Strategy of Interlinking Converter in Hybrid AC/DC Microgrid [J]. Electric Power Construction, 2019, 40(11): 48-54.
[2]	GUO Yajuan，CHEN Jinming，HE Hongyu， WU Qianhong，HAN Bei，LI Guojie2. A Review on AC/DC Hybrid Microgrid Key Technology Containing Distributed New Energy [J]. Electric Power Construction, 2017, 38(3): 9-.
[3]	XIANG Yang, FU Ming, ZHANG Aifang, DOU Xiaobo,JIAO Yang, YANG Yeqing. Small Signal Stability Analysis of AC/DC Hybrid Microgrid Under Isolated Island Operation [J]. Electric Power Construction, 2017, 38(1): 96-.
[4]	WANG Haojie, HAN Minxiao, KONG Qixiang. Coordinated Control of Energy Storage DC/DC and Interface Converter in AC/DC Hybrid Microgrid [J]. Electric Power Construction, 2016, 37(5): 50-56.
[5]	HUA Haorui, LI Peng. Multiple Time Scale Optimal Operation Method of AC/DC Hybrid Microgrid Considering Power Prediction Error [J]. Electric Power Construction, 2016, 37(12): 40-.
[6]	DI Kaili, LI Xinming, LI Peng， XU Shaojun, SUN Jian. Optimal Operation of AC/DC Hybrid Microgrid Based on Coevolution Improved Black Hole Algorithm [J]. Electric Power Construction, 2016, 37(10): 1-.
[7]	LIU Xingjie，DU Zhe，YAN Xiao. Optimal Allocation of Power Supply in AC/DC Hybrid Stand-Alone Microgrid [J]. Electric Power Construction, 2016, 37(10): 16-.
[8]	GAO Erchao, LI Ping, YUAN Tengfei, WANG Xianru,ZHU Cui. Design and Optimization of High Voltage Side Filter Control System in Power Frequency Series Resonance Equipment [J]. ELECTRIC POWER CONSTRUCTION, 2014, 35(5): 50-55.
[9]	LI,LI Junqing，ZHANG Jianghui，WANG Baochen. Research on Embedded Monitoring System for Transformer's Partial Discharge [J]. ELECTRIC POWER CONSTRUCTION, 2013, 34(6): 82-86.
[10]	DENG Yurong1，GUO Lijuan1，GUO Feifei2，ZHANG Wei1. Partial Discharge Fault Identification by Using Adaptive BP Neural Network Based on Second Generation Wavelet [J]. ELECTRIC POWER CONSTRUCTION, 2013, 34(6): 87-91.
[11]	DANG Xiaojian, LI Zhihua, LIAO Junlin,WANG Zheng. Analysis on Partial Frequency Accident of Turbine [J]. ELECTRIC POWER CONSTRUCTION, 2013, 34(4): 95-98.