考虑光伏双评价指标的混合储能平滑出力波动策略  

Hybrid Energy Storage Smoothing Output Fluctuation Strategy Considering Photovoltaic Dual Evaluation Indicators

作　　者：郑浩 谢丽蓉[1] 叶林[2] 路朋 王凯丰 Zheng Hao;Xie Lirong;Ye Lin;Lu Peng;Wang Kaifeng(Wind and Solar Storage Branch of National Key Laboratory of Power System and Power Generation Equipment Control and Simulation Xinjiang University,Urumqi 830047 China;College of Information and Electrical Engineering China Agricultural University,Beijing 100083 China;State Key Lab of Control and Simulation of Power Systems and Generation Equipments Tsinghua University,Beijing 100084 China)

机构地区：[1]电力系统及发电设备控制和仿真国家重点实验室风光储分室(新疆大学),乌鲁木齐830047 [2]中国农业大学信息与电气工程学院,北京100083 [3]电力系统及发电设备控制和仿真国家重点实验室(清华大学),北京100084

出　　处：《电工技术学报》2021年第9期1805-1817,共13页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51667021);新疆维吾尔自治区区域协同创新专项(科技援疆计划)(2018E02072);新疆维吾尔自治区高校科研计划自然科学重点项目(XJEDU2020I004);清华大学电力系统及大型发电设备安全控制与仿真国家重点实验室开放研究课题(SKLD20M20)资助项目。

摘　　要：针对光伏有功功率波动影响电网稳定运行问题,提出一种考虑光伏双评价指标的混合储能平滑出力波动控制策略。首先,根据不同时间尺度分别建立以波动率和光滑度为平滑出力波动目标的双评价指标;其次,基于改进集合经验模态分解(MEEMD)方法,实现光伏有功功率信号分解,采用灰色关联度将功率重构为高频和低频部分,得到最终的高频超级电容和低频蓄电池平滑出力波动指令;然后,以滑动平均滤波平滑曲线为充/放电目标参考功率,得到混合储能的充/放电功率指令,并用蓄电池和超级电容器组成的混合储能电池组以5min时间尺度进行出力波动的平滑,用超级电容器组成的单一电池组以1min时间尺度进行光滑度平顺,平顺光滑度跟随平滑出力波动,得到不同时间尺度的储能系统优先级平滑出力波动策略;最后,以新疆某光伏电站为例,综合对比多种光伏功率分解方法和不同评价指标,验证了所提策略的有效性。Aiming at the problem of photovoltaic active power fluctuations affecting the stable operation of the power grid,a hybrid energy storage smoothing output fluctuation control strategy considering the dual evaluation indicators of photovoltaics is proposed.Firstly,according to different time scales,two evaluation indicators with volatility and smoothness as smoothing output fluctuation targets are established.Secondly,based on the improved ensemble empirical mode decomposition(MEEMD)method,the photovoltaic active power signal is decomposed,and the power is reconstructed into high-frequency and low-frequency parts with the gray correlation degree,and the commands of final high-frequency supercapacitor and low-frequency battery smoothing output fluctuation are obtained.Then,the moving average filter smooth curve is used as the charge/discharge target reference power to obtain the charge/discharge power commands of the hybrid energy storage instruction,and use a hybrid energy storage battery pack composed of batteries and supercapacitors to smooth output fluctuations at a time scale of 5min and a single battery pack composed of supercapacitors to smooth smoothness at a time scale of 1min.The smoothness follows the smooth output fluctuations,then getting different time scales of energy storage system priority smoothing output fluctuation strategy.Finally,taking a photovoltaic power station in Xinjiang as an example,a comprehensive comparison of various photovoltaic power decomposition methods and different evaluation indicators verifies the effectiveness of the proposed strategy.

关 键 词：平滑光伏出力波动 双评价指标 混合储能 改进集合经验模态分解 优先级控制 

分 类 号：TM615[电气工程—电力系统及自动化]