储能科学与技术 ›› 2018, Vol. 7 ›› Issue (4): 726-731.doi: 10.12028/j.issn.2095-4239.2018.0054

• 研究及进展 • 上一篇    下一篇

一种适用于光伏并网混合储能系统的功率分配策略

米根锁, 穆艳停   

  1. 兰州交通大学自动化与电气工程学院, 甘肃 兰州 730070
  • 收稿日期:2018-04-08 修回日期:2018-04-25 出版日期:2018-07-01 发布日期:2018-07-01
  • 通讯作者: 米根锁(1966-),男,教授,研究方向为计算机测控技术及应用,E-mail:18219715303@163.com
  • 作者简介:米根锁(1966-),男,教授,研究方向为计算机测控技术及应用,E-mail:18219715303@163.com
  • 基金资助:
    国家自然科学基金项目(51667013)。

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

MI Gensuo, MU Yanting   

  1. School of Automation & Electrical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China
  • Received:2018-04-08 Revised:2018-04-25 Online:2018-07-01 Published:2018-07-01

摘要: 针对光伏并网系统中光伏微电源出力的波动性和间歇性,将蓄电池和超级电容器构成的混合储能系统HESS(hybrid energy storage system)应用到光伏并网系统中可以实现光伏功率平滑、能量平衡以及提高并网电能质量。在同时考虑蓄电池的功率上限和超级电容的荷电状态(SOC)的情况下,对混合储能系统提出了基于超级电容SOC的功率分配策略;该策略以超级电容的SOC和功率分配单元的输出功率作为参考值,对混合储能系统充放电过程进行设计。超级电容和蓄电池以Bi-direction DC/DC变换器与500 V直流母线连接,其中超级电容通过双闭环控制策略对直流母线电压进行控制。仿真结果表明,所提功率分配策略能对混合储能系统功率合理分配,而且实现了单位功率因数并网,稳定了直流母线电压。

关键词: 光伏发电, 蓄电池, 超级电容, 荷电状态, 功率分配策略

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

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