双锂电池–电容器混合储能系统控制策略设计  

Control Strategy Design of Dual Lithium Battery-capacitor Hybrid Energy Storage System

作　　者：李军徽[1] 穆钢[1] 崔新振 葛延峰[2] 高凤杰[1] 金鹏[3] 

机构地区：[1]东北电力大学电气工程学院,吉林132012 [2]国网辽宁省电力有限公司,沈阳110006 [3]国网辽宁省电力有限公司沈阳供电公司,沈阳110811

出　　处：《高电压技术》2015年第10期3224-3232,共9页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2013CB228201);国家自然科学基金(51207018);国家电网公司科技项目(SGLNSY00FZJS1500191);吉林市科技发展计划(201464038)~~

摘　　要：针对电池储能用于平抑风电功率波动时频繁充放电切换工作状态降低了电池使用寿命的问题,提出了锂电池寿命衰减程度评价方法,并根据此方法确定了锂电池在寿命周期内吞吐最大电量所对应的最佳运行充放电循环深度。考虑到能量型储能介质和功率型储能介质的优势互补以及单电池储能运行充放电循环深度对电池带来的不利影响,采用了基于双锂电池和超级电容器的混合储能系统主电路结构,并根据分段均值方法确定储能系统的参考功率,设计了锂电池运行在最佳充放电深度内的运行控制策略。最后基于国内某风电场的实测风电功率数据,对提出的储能系统结构和运行控制策略的合理性和有效性进行了验证。算例结果表明,在完成同一个目标指令时,单储能运行时充放电循环深度与标准充放电循环深度的偏离程度较大,对电池储能寿命衰减的影响较大;而双电池储能A、B单元能在所提出的协调控制策略下尽可能运行在标准充放电循环深度,从而提高了电池的使用寿命和经济效益。The service life of battery is reduced due to its work state of frequent charging and discharging conversion when the battery energy storage is applied to smooth wind power fluctuations. To this end, an evaluation method of the lithium battery life attenuation degree is presented and the best cycle depth of charge and discharge corresponding to the maximum throughput electricity in the life cycle of battery is established according to the method. The main circuit struc- ture of hybrid storage system of dual lithium battery and super capacitors is adopted, considering that the running cycle depth of charge and discharge of the single battery has a detrimental effect on the lifetime of battery and the storage media of high energy density and high power density have complementary advantages. Meantime, the reference power of energy storage unit is determined by the piecewise average algorithm and the control strategy of dual battery units is designed to make the lithium battery running in the optimal charge and discharge depth. At last, based on the basic parameters of large-scale battery energy storage system in which wind farms have been installed in some region, the rationality and ef- fectiveness of the above structure and operation control strategy of energy storage system are verified. The simulation results show that, the deviation between cycle depth of charge and discharge of the single battery and standard cycle depth of charge and discharge is remarkable at the same goal, and it has a great effect on the decay of battery energy storage life; the A and B units of double battery energy storage can run at the standard cycle depth by using the proposed coordinating control strategy, thus the battery lifetime and economic benefits are improved greatly.

关 键 词：风电 双锂电池 超级电容器 控制策略 循环深度 电池使用寿命 

分 类 号：TM91[电气工程—电力电子与电力传动] TM53