A power allocation strategy of a hybrid energy storage system for a PV grid-connected system

doi:10.12028/j.issn.2095-4239.2018.0054

Abstract

Abstract: A battery-supercapacitor hybrid energy storage system (HESS) is applied to a PV grid-connected system to deal with fluctuation and intermittency of the PV microgrid to achieve smooth photovoltaic system power output, balance and improve grid power quality. Considering the upper limit of the battery power and the state of charge (SOC) of the supercapacitor, a power distribution strategy is proposed for the hybrid energy storage system. The strategy uses the SOC of the supercapacitor and the output of the power allocation unit as a reference value to design the hybrid energy storage system charge and discharge processes. The supercapacitor and the battery are connected to the 500 V DC bus using a Bi-direction DC/DC converter. The supercapacitor controls the DC bus voltage through a double closed-loop control strategy. The simulation results show that the proposed power allocation strategy can rationally distribute the power of the hybrid energy storage system, achieve the grid connection of unit power factor and stabilize the DC bus voltage.

Key words: photovoltaic power generation, battery, super capacitor, state of charge, power distribution strategy

CLC Number:

TM615

MI Gensuo, MU Yanting. A power allocation strategy of a hybrid energy storage system for a PV grid-connected system[J]. Energy Storage Science and Technology, 2018, 7(4): 726-731.

References

[1] 孟润泉, 刘家赢, 文波, 等. 直流微网混合储能控制及系统分层协调控制策略[J]. 高电压技术, 2015, 41(7):2186-2193. MENG Runquan, LIU Jiaying, WEN Bo, et al. Control strategy of hybrid energy storage and hierarchical control of DC microgrid[J]. High Voltage Engineering, 2015, 41(7):2186-2193.
[2] 李培强, 段克会, 董彦婷, 等. 含分布式混合储能系统的光伏直流微网能量管理策略[J]. 电力系统保护与控制, 2017, 45(13):42-48. LI Peiqiang, DUAN Kehui, DONG Yanting, et al. Energy management strategy for photovoltaic DC microgrid with distributed hybrid energy storage system[J]. Power System Protection and Control, 2017, 45(13):42-48.
[3] 张卫东, 刘祖明, 申兰先. 利用储能平抑波动的光伏柔性并网研究[J]. 电力自动化设备, 2013, 33(5):106-111. ZHANG Weidong, LIU Zuming, SHEN Lanxian. Study of photovoltaic flexible grid connection using energy storage to suppress fluctuations[J]. Electric Power Automation Equipment, 2013, 33(5):106-111.
[4] 邱培春, 葛宝明, 毕大强. 基于蓄电池储能的光伏并网发电功率平抑控制研究[J]. 电力系统保护与控制, 2011, 39(3):29-33. QIU Peichun, GE Baoming, BI Daqiang. Study on power grid suppression control of photovoltaic grid-connected generation based on battery energy storage[J]. Power System Protection and Control, 2011, 39(3):29-33.
[5] 李凡, 张建成. 基于储能系统的光伏发电系统功率缓冲控制研究[J]. 储能科学与技术, 2013, 2(6):593-597. LI Fan, ZHANG Jiancheng. Research on power buffer control of photovoltaic power generation system based on energy storage system[J]. Energy Storage Science and Technology, 2013, 2(6):593-597.
[6] 陈雪丹, 陈硕翼, 乔志军, 等. 超级电容器的应用[J]. 储能科学与技术, 2016, 5(6):800-806. CHEN Xuedan, CHEN Shuoyi, QIAO Zhijun, et al. Application of supercapacitors[J]. Energy Storage Science and Technology, 2016, 5(6):800-806.
[7] 张纯江, 董杰, 刘君, 等. 蓄电池与超级电容混合储能系统的控制策略[J]. 电工技术学报, 2014, 29(4):334-340. ZHANG Chunjiang, DONG Jie, LIU Jun, et al. Control strategy of hybrid energy storage system with battery and super capacitor[J]. Transactions of China Electrotechnical Society, 2014, 29(4):334-340.
[8] 李逢兵, 谢开贵, 张雪松, 等. 基于锂电池充放电状态的混合储能系统控制策略设计[J]. 电力系统自动化, 2013, 37(1):70-75. LI Fengbing, XIE Kaigui, ZHANG Xuesong, et al. Control strategy design of hybrid energy storage system based on state of charge and discharge of lithium battery[J]. Automation of Electric Power Systems, 2013, 37(1):70-75.
[9] 郭亮, 贾彦, 康丽, 等. 一种蓄电池和超级电容器复合储能系统[J]. 储能科学与技术, 2017, 6(2):296-301. GUO Liang, JIA Yan, KANG Li, et al. A battery and super capacitor composite energy storage system[J]. Energy Storage Science and Technology, 2017, 6(2):296-301.
[10] DOUGAL R A, LIU S, WHITE R E. Power and life extension of battery-ultracapacitor hybrids[J]. IEEE Trans on Components and Packaging Technologies, 2002, 25(1):120-131.
[11] ABDERRAHIM T, SAID B. Control and management of grid connected PV-battery hybrid system based on three-level DCI[C]//International Conference on Systems and Control. 2017:439-444.
[12] 高志强, 孟良, 梁宾, 等. 光储联合发电系统控制策略[J]. 储能科学与技术, 2013, 2(3):300-306. GAO Zhiqiang, MENG Liang, LIANG Bin, et al. Control strategies for a photovoltaic-energy storage hybrid system[J]. Energy Storage Science and Technology, 2013, 2(3):300-306.
[13] 张国驹, 唐西胜, 齐智平. 超级电容器与蓄电池混合储能系统在微网中的应用[J]. 电力系统自动化, 2010, 34(12):85-89. ZHANG Guoxi, TANG Xisheng, QI Zhiping. Application of hybrid energy storage system with super capacitor and battery in microgrid[J]. Automation of Electric Power Systems, 2010, 34(12):85-89.
[14] 常丰祺, 郑泽东, 李永东. 一种新型混合储能拓扑及其功率分流算法[J]. 电工技术学报, 2015, 30(12):128-135. CHANG Fengqi, ZHENG Zedong, LI Yongdong. A new hybrid energy storage topology and its power shunting algorithm[J]. Transactions of China Electrotechnical Society, 2015, 30(12):128-135.
[15] 丁若星, 肖曦, 王奎, 等. 混合储能系统基于荷电状态的功率分配方法[J]. 电力电子技术, 2015, 49(3):25-26+29. DING Ruoxing, XIAO Wei, WANG Kui, et al. Power allocation method based on state of charge in hybrid energy storage system[J]. Power Electronics, 2015, 49(3):25-26+29.