การปรับปรุงเทคนิคการวัดสมมูลสำหรับการประมาณสถานะ ระบบกำลังไฟฟ้า

Abstract

This independent study has investigated an approach to improve the power system state estimation method that used the equivalent measurement technique by considering the dependency of the equivalent measurements. The proposed method has been tested on the IEEE 14, 30, 57, 118 and300 bus systems and compared with the old equivalent measurement technique method which assumes that all equivalent measurements are independent, and the conventional method which used the data obtained from the power system. Four types of objective functions, namely the weight least squares (WLS), the weight lest absolute value (WLAV), the quadratic-linear (QL) and the square root (SR), have been studied. The mean and standard deviation of the error of the estimated state variables, and the computation time are compared. From the experimental results, it is found that the histogram of mean error obtained by the improved method is more similar to the histogram of the conventional method than the old equivalent measurement technique but the proposed method uses less computation time.