摘要
新能源发电类型、渗透率及控制方式的不同会影响电力系统实时惯量,评估惯量水平有助于提高电力系统抗扰动能力。该文在分析风电、光伏的虚拟惯性响应特性及其对电力系统频率稳定性影响的基础上,考虑负荷静态电压特性,提出一种基于量测数据的新能源电力系统区域等效惯量实时评估方法。评估结果计及发电机惯量、新能源虚拟惯量和负荷等效惯量。为了减小因扰动后频率分布特性造成的误差,从加权平均数的角度提出频率采样点的选取及区域频率的计算方法,解决了量测数据众多且获取困难的问题。通过算例验证了所提方法对传统电力系统及新能源电力系统区域等效惯量评估均具有可行性和有效性。
The high proportion of new energy connected to the grid makes the problem of low inertia of the power system increasingly prominent,and the frequency problem more frequency problem is more serious.In order to improve the stable operation ability of the new energy power system,it is necessary to evaluate the level of system inertia and analyze the influence of new energy power generation type,permeability and virtual inertia control mode on the real-time inertia of the system At present,the most widely used evaluation methods have the problem of a large number of measurement data and difficulty in obtaining them.The evaluation accuracy is affected by the selection of frequency sampling points,measurement devices,and the processing methods of measurement data.To address these issues,this paper proposes a method for assessing the regional equivalent inertia of new energy system based on measured data.The active power,frequency,and voltage data are used to accurately calculate the inertia,measurement data are few and easy to obtain,which reduces the data processing steps and is still applicable when the internal parameters of the new energy units are unknown.Firstly,the virtual inertia response characteristics of wind power and photovoltaic power and their influence on the frequency stability of the system are analyzed.Secondly,on the basis of analyzing the principle of regional equivalent inertia assessment,the expression of regional equivalent inertia of new energy system is derived by considering the load voltage characteristics.Finally,in order to reduce the error caused by the frequency distribution characteristics,the selection of sampling points and the calculation method of regional frequency are proposed from the perspective of weighted average.Sampling points are determined according to the real-time inertia monitoring results of the SCADA system,which saves the installation cost of PMUs(phasor measurement units)and avoids large amount of calculations.In addition,the low-pass filter and sliding window techn
作者
马燕峰
李金媛
王子建
赵书强
郭润生
Ma Yanfeng;Li Jinyuan;Wang Zijian;Zhao Shuqiang;Guo Runsheng(Key Laboratory of Distributed Energy Storage and Microgrid in Hebei Province North China Electric Power University,Baoding 071003 China;State Grid Shuozhou Electric Power Company,Shuozhou 036002 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2024年第17期5406-5421,共16页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(52277100)。
关键词
新能源电力系统
区域等效惯量评估
量测数据
联络线功率
虚拟惯性控制
负
荷静态电压特性
New energy power system
regional inertia assessment
measurement data
tie-line power
virtual inertial control
load static voltage characteristics
