摘要
随着风电和光伏的快速发展,水电和火电在发电结构中比重的大幅下降将导致未来电力系统的频率特性出现变化。为研究系统频率特性的变化,该文首先给出新能源高渗透的电力系统的频率模型和传递函数。引入频率阶跃或功率阶跃引起的稳态频率误差,对系统的稳定性和稳态频率误差展开详细分析。定义系统的动态频率响应系数,并给出新能源发电比重上限的估计。假定新能源发电的调频容量充足,提出新能源参与频率控制的2种方式,研究比较它们对系统稳态频率误差的影响。最后通过时域数字仿真验证所得结论,并揭示未来电力系统频率特性的变化趋势。
With the rapid development of wind farms and photovoltaic plants,the future power systems might experience the decline of fundamental frequency characteristics due to the severe reduction of power supply of thermal and hydropower plants.In order to study such decline,the frequency model of the power system highly penetrated by new energy was proposed along with its transfer functions.And the steady state errors(SSEs)of frequency due to frequency or power step response were deployed in this paper.A thorough analysis was performed on the stability and the SSEs of the highly penetrated power system.The dynamic frequency response characteristic(DFRC)of the highly penetrated power system was defined and the upper limit of the proportion of new energy generation was estimated.Assuming that the capacity of frequency control provided by the new energy generation was enough,the two schemes of frequency control of new energy generation were introduced and compared,which make the difference in the SSEs of the highly penetrated power system.Finally,time domain digital simulations were performed to verify the proposed conclusions and to reveal the trend of frequency characteristics of future power systems.
作者
张剑云
李明节
ZHANG Jianyun;LI Mingjie(National Power Dispatching Center,Xicheng District,Beijing 100031,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2020年第11期3498-3506,共9页
Proceedings of the CSEE
关键词
新能源
高渗透率
频率特性
稳态频率误差
动态频率响应系数
频率控制
new energy
high penetration
frequency characteristics
steady state error of frequency
dynamic frequency response characteristic
frequency control
