摘要
影响电力系统短期负荷预测的因素有多种,因此在进行短期负荷预测时,考虑的因素种类越多,预测的精度越高。在考虑环境因素的基础上,构建分时电价下考虑储能调度因素的改进鲸鱼算法优化Elman神经网络模型。在智能电网下,由于储能调度能够使传统的负荷曲线发生改变,首先在基于分时电价的基础上构建储能调度模型,对储能用户在各时段的充放电行为进行具体分析。然后由于Elman神经网络具有收敛速度慢、容易陷入局部最优等缺点,提出了一种改进的鲸鱼算法(MWOA)用于优化神经网络的权值和阈值,进一步提高了神经网络的收敛速度和全局寻优能力。最后构建考虑储能调度因素的短期负荷预测模型,通过对某地电网2018年7月至8月的数据为例进行仿真分析,并与所提到的其他预测模型进行比较。通过误差结果分析可知所提方法的预测精度更高,收敛速度更快。
There are many factors affecting the short-term load forecasting of power systems,therefore,when performing short-term load forecasting,the more types of factors are considered,the higher the accuracy of predicting is.On the basis of considering environmental factors,the improved whale algorithm optimization Elman neural network model considering the factors of energy storage scheduling under time-of-use price is constructed.Under the smart grid,because the energy storage scheduling can change the traditional load curve,firstly,based on the time-sharing price,the energy storage scheduling model is constructed to analyze the charging and discharging behavior of the energy storage users in each period.Then,because the Elman neural network has the disadvantages of slow convergence and easy to fall into local optimum,a Modified Whale Optimization Algorithm(MWOA)is proposed to optimize the weight and threshold of the neural network,which further improves the convergence and global search of the neural network excellent ability.Finally,constructing a short-term load forecasting model considering energy storage scheduling factors,the analysis of the data of a certain power grid from July to August of 2018 is carried out and compared with other prediction models mentioned.The error results analysis shows that the proposed method has higher prediction accuracy and faster convergence.
作者
李卫国
陈立铭
张师
徐备
王旭光
刘宏伟
LI Weiguo;CHEN Liming;ZHANG Shi;XU Bei;WANG Xuguang;LIU Hongwei(School of Electrical Engineering,Northeast Electric Power University,Jilin 132012,China;Zhaoqing Power Supply Company,China Southern Power Grid Co.,Ltd.,Zhaoqing 526000,China)
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2020年第7期133-140,共8页
Power System Protection and Control
基金
国家电网公司科技项目资助(SGTJDK00DWJS1700034)“面向随机性电源的多元负荷主动响应及预测控制技术研究与应用”。
关键词
短期负荷预测
储能调度
ELMAN神经网络
鲸鱼算法
分时电价
short-term load forecasting
energy storage scheduling
Elman neural network
whale algorithm
time-sharing price
