Control Method for Active Power in Electric-Hydrogen Hybrid Energy-Storage Microgrids
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摘要:
在多电-氢微电网并联运行的交流系统中，采用传统控制方法的逆变器会受到输出线路阻抗差异所产生的影响产生较大环流，甚至无法实现有功功率的合理分配，考虑到系统中电压偏差与有功功率间的关系，对多微电网的有功功率分配问题进行分析研究. 首先，构建含光伏、燃料电池、电解槽、蓄电池的电-氢混合储能微电网交流系统模型；其次，根据反下垂控制中有功功率与电压间的关系，构造考虑电压偏差的反下垂控制，并为使额定有功功率自适应调节，提出基于功率跟随控制的反下垂控制方法；最后，在多电-氢微电网并联运行的系统中，对本文所提方法进行RT-LAB半实物实验验证及与其他方法的对比验证. 实验结果显示：基于本文所提控制方法的系统稳定后功率分配的准确度达97.50%，母线电压的精准度达99.86%，环流大小的范围约为[−3.0, 3.0] A，均优于其余方法.
Abstract:In an AC system with parallel operation of electricity-hydrogen micro-grids, when adopting traditional control methods, the difference in output line impedance will affect inverters, and large circulating currents occurs such that a reasonable distribution of active power become inaccessible. Given the relationship between the voltage deviation and the active power, the active power distribution between multiple micro-grids is analyzed. Firstly, the AC system model of the electric-hydrogen hybrid energy-storage micro-grid is constructed, including photovoltaic, battery, fuel cell, and electrolyzer. Secondly, following the relationship between the active power and the voltage in the reverse droop control, a reverse droop control based on power following control is proposed to work out voltage deviation and auto-adjust the rated active power. Finally, within a parallel operation of electric-hydrogen micro-grids, the proposed method is compared with other methods and is verified by hardware-in-the-loop experiments on the platform of RT-LAB. The experimental results show that the proposed method outperforms other methods: the accuracy of power distribution after stabilization is 97.50%, the accuracy of the bus voltage is 99.86%, and the circulating current mostly ranges in [−3.0, 3.0] A.
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Key words:
- electric-hydrogen microgrid /
- hybrid energy storage /
- power control
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图 5 基于功率跟随控制的反下垂控制框图
Figure 5. Block diagram of reverse droop control based on power following control
图 6 基于功率跟随控制的反下垂控制频谱响应特性
Figure 6. Spectrum response characteristics of reverse droop control based on power following control
图 9 基于电压恢复机制的反下垂控制方法实验结果
Figure 9. Experimental results of reverse droop control based on voltage recovery mechanism
表 1 系统参数
Table 1. System parameters
参数 取值 逆变器 1 线路阻抗 Zline_1/Ω 0.642 + j0.083 逆变器 2 线路阻抗 Zline_2/Ω 0.963 + j0.124 5 逆变器 3 线路阻抗 Zline_3/Ω 1.284 + j0.166 滤波电感/MH 5 滤波电容/MF 0.5 额定电压/V 220 额定无功功率/kvar 5 逆变器容量比例 1∶1∶1 
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表 2 元件参数
Table 2. Component parameters
元件 参数 数值 光伏阵列 环境温度/℃ 25 燃料电池 额定功率/W 2000 额定电压/V 24 电解槽 额定功率/W 2000 储氢罐 最大容许压强/MPa 35 体积/L 1 初始容量/% 50 蓄电池 最大充放电功率/W 4000 容量/（A·h） 40 额定电压/V 500 初始荷电状态/% 50
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[1] 李霞林,郭力,王成山,等. 直流微电网关键技术研究综述[J]. 中国电机工程学报,2016,36(1): 2-17.LI Xialin, GUO Li, WANG Chengshan, et al. Key technologies of DC microgrids: an overview[J]. Proceedings of the CSEE, 2016, 36(1): 2-17. [2] LI Q, QIU Y, YANG H, et al. Stability-constrained two-stage robust optimization for integrated hydrogen hybrid energy system[J]. CSEE Journal of Power and Energy Systems, 2021, 7(1): 162-171. [3] 刘欣博,刘宁,宋晓通,等. 基于交流恒功率负载特性的交直流混合微电网系统大信号稳定性判据[J]. 高电压技术,2021,47(10): 3441-3451.LIU Xinbo, LIU Ning, SONG Xiaotong, et al. Large-signal stability criteria of AC/DC hybrid microgrid based on AC constant power loads[J]. High Voltage Engineering, 2021, 47(10): 3441-3451. [4] 蔡国伟,孔令国,薛宇,等. 风氢耦合发电技术研究综述[J]. 电力系统自动化,2014,38(21): 127-135. doi: 10.7500/AEPS20131231004CAI Guowei, KONG Lingguo, XUE Yu, et al. Overview of research on wind power coupled with hydrogen production technology[J]. Automation of Electric Power Systems, 2014, 38(21): 127-135. doi: 10.7500/AEPS20131231004 [5] EHSAN A, YANG Q. Optimal integration and planning of renewable distributed generation in the power distribution networks: a review of analytical techniques[J]. Applied Energy, 2018, 210: 44-59. doi: 10.1016/j.apenergy.2017.10.106 [6] 李奇,蒲雨辰,韩莹,等. 电-氢孤岛直流微电网的分层能量管理[J]. 西南交通大学学报,2020,55(5): 912-919.LI Qi, PU Yuchen, HAN Ying, et al. Hierarchical energy management for electric-hydrogen island direct current micro-grid[J]. Journal of Southwest Jiaotong University, 2020, 55(5): 912-919. [7] 米阳,陈鑫,季亮,等. 基于虚拟额定电流的直流微电网分布式储能单元精确电流分配研究[J]. 电网技术,2020,44(3): 823-835.MI Yang, CHEN Xin, JI Liang, et al. Accurate current sharing of distributed energy storage units in DC microgrid based on virtual rated current[J]. Power System Technology, 2020, 44(3): 823-835. [8] 朱晓荣,韩丹慧,孟凡奇,等. 提高直流微电网稳定性的并网换流器串联虚拟阻抗方法[J]. 电网技术,2019,43(12): 4523-4531.ZHU Xiaorong, HAN Danhui, MENG Fanqi, et al. Grid converter series virtual impedance method for improving DC microgrid stability[J]. Power System Technology, 2019, 43(12): 4523-4531. [9] 柴秀慧,张纯江,柴建国,等. 改进互联通信荷电状态下垂控制及功率均衡优化[J]. 电工技术学报,2021,36(16): 3365-3374.CHAI Xiuhui, ZHANG Chunjiang, CHAI Jianguo, et al. Improved interconnected communication state of charge droop control and power balance optimization[J]. Transactions of China Electrotechnical Society, 2021, 36(16): 3365-3374. [10] 王晓寰,王书光,刘聪哲,等. 下垂控制并联系统中功率精确分配的控制策略[J]. 电力电子技术,2019,53(8): 4-7.WANG Xiaohuan, WANG Shuguang, LIU Congzhe, et al. Accurate power sharing strategy for parallel system based on droop control[J]. Power Electronics, 2019, 53(8): 4-7. [11] 麦倩屏,陈鸣. 用于多微源低压微电网的虚拟阻抗反下垂控制[J]. 电力系统保护与控制,2018,46(1): 96-102. doi: 10.7667/PSPC162039MAI Qianping, CHEN Ming. P-V/Q-f droop control strategy with virtual impedance for low-voltage microgrid with multiple micro sources[J]. Power System Protection and Control, 2018, 46(1): 96-102. doi: 10.7667/PSPC162039 [12] 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. [13] PU Y C, LI Q, CHEN W R, et al. Hierarchical energy management control for islanding DC microgrid with electric-hydrogen hybrid storage system[J]. International Journal of Hydrogen Energy, 2019, 44(11): 5153-5161. doi: 10.1016/j.ijhydene.2018.10.043 [14] LI L Y, CHEN W R, HAN Y, et al. A stability enhancement method based on adaptive virtual resistor for electric-hydrogen hybrid DC microgrid grid-connected inverter under weak grid[J]. Electric Power Systems Research, 2021, 191: 106882.1-106882. [15] LI Q, WANG T H, DAI C H, et al. Power management strategy based on adaptive droop control for a fuel cell-battery-supercapacitor hybrid tramway[J]. IEEE Transactions on Vehicular Technology, 2018, 67(7): 5658-5670. doi: 10.1109/TVT.2017.2715178 [16] IPSAKIS D, VOUTETAKIS S, SEFERLIS P, et al. Power management strategies for a stand-alone power system using renewable energy sources and hydrogen storage[J]. International Journal of Hydrogen Energy, 2009, 34(16): 7081-7095. doi: 10.1016/j.ijhydene.2008.06.051 -
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