Study and improvement of least squares algorithm

The least squares algorithm (LSA)has nicely filter characteristic and variable data window.But the amount of counting is so large that it can not meet the real-time requirement of microprocessor-based protection.Based on thorough analyses and researches,an improved LSA is presented in this paper,which can overcome this shortcoming. Besides the original characteristics of LSA,the improved LSA greatly reduces the amount of counting so that it can be applied to the microprocessor-based protection.The result of analyses and simulations indicates that the improved LSA can be used to accurately calculate electrical parameters.