一种区域电网惯量实用化快速估计方法

A practical and fast estimation method of moment of inertia in a regional power network

已有电力系统惯量估计的扰动法适用性较差,而统计法既无法准确计入新能源容量占比因素,也不能细致考虑负荷侧等效惯量。基于同步发电机和风电与负荷侧电动机等效惯量估计原理分析,提出了一种基于统计法的区域电网惯量实用化快速估计方法。所提方法无需扰动后的系统运行参数数据,而是通过源、荷两侧在线发电机及电动机等效惯量累加得到区域电网惯量,利用历史数据回归拟合系数来计入新能源容量占比的影响,因而具有鲁棒性强与计算速度快等优点。针对某区域电网两次实际频率波动事故场景,利用所提方法进行了区域电网惯量估计,以扰动法计算结果为基准,验证了该算法的准确性和实用性。

The perturbation method for estimating the the existing power system’s moment of inertia has poor applicability,while the statistical method can neither accurately account for the proportion of renewable energy capacity nor carefully consider the equivalent inertia of the load side.Based on the analysis of the equivalent inertia estimation principle of a synchronous generator,wind power and load side motor,a practical and fast estimation method of regional power grid moment of inertia based on statistical method is proposed.The proposed method does not need the system operation parameter data after disturbance,but obtains the overall inertia of the regional power grid by accumulating the equivalent inertia of the on-line generators and motors on both sides of the source and load.It also takes the influence of the renewable energy capacity proportion into account by using the regression fitting coefficient of historical data.Thus it has the advantages of strong robustness and fast calculation.Examining two actual frequency fluctuation accident scenarios of a regional power grid,the proposed method is used to estimate the regional grid inertia,and the accuracy and practicability of the algorithm are verified based on the results of the perturbation method.