摘要
风力、光伏等新能源发电输出功率具有波动性,为减小功率波动对电网的影响,提出平抑功率波动的储能优化配置方法。将频谱分析和低通滤波相结合,根据新能源输出功率频谱分析结果,结合并网功率波动率约束、储能充放电效率及荷电状态(state of charge,SOC),在频率波动范围内确定最佳的一阶低通滤波器的截止频率,得到经滤波和修正的并网联络线功率及储能充放电补偿功率,从而确定满足平滑出力运行控制需求的最优储能额定功率、容量和初始SOC。采用南京地区某屋顶光伏实测数据及波动要求,对该方法进行验证,结果表明采用此方法能以较小储能容量将光伏输出功率波动从27.3%降低到1.62%,且在整个周期内储能不会过充过放。
Wind power and photovoltaic （PV） power have the characteristic of generation output variability. To reduce the impact of power fluctuations on grids, this paper put forward the energy storage optimization configuration method which combined spectrum analysis and the low-pass filter for smoothing output fluctuations. Based on spectrum analysis results, considering power fluctuation rate, energy storage charging/discharging efficiency and state of charge （SOC）, the best cut-off frequency of low-pass filter was determined. Then, the tie-lines power and energy storage compensation power curves were obtained by filtering and correcting. According to the compensation power curves, the optimal rated power, capacity and initial SOC of energy storage were calculated to meet the demand of smoothing output fluctuations. The proposed method was verified by using the rooftop PV data measured in Nanjing area. The results show that the method can reduce the PV power fluctuations from 27.3% to 1.62% with small energy storage capacity, and the energy storage system will not be overcharged or over discharged in the whole cycle.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2014年第22期3700-3706,共7页
Proceedings of the CSEE
基金
国家自然科学基金项目(51361135703)~~
关键词
新能源
储能系统
平滑波动
频谱分析
低通滤波
优化配置
new energy
energy storage system
smoothfluctuations
spectrum analysis
low-pass filter
optimalallocation
