The invention provides an
estimation method of external network Thevenin equivalent parameters based on
single point measurement information, relating to the power
system external network Thevenin equivalent parameters
estimation method technology field. According to the invention, a computer and a
data acquisition apparatus of a line terminal are utilized, through a program, firstly a parameter of a monitored line is inputted, then according to
SCADA measurement data of a plurality of periods of a terminal of the monitored line, a least square equivalence model with minimum of square sum of residuals as an object is established, the model is solved, and equivalent built-in potential and an equivalent impedance parameter of a network outside of the monitored line are obtained. According to the invention, a physical meaning of the external network Thevenin equivalent parameters is fully considered, rationality of the external network equivalent parameters can be effectively ensured, influence of a measurement error on an equivalent parameters calculation result can be effectively avoided, accuracy is high, the method is simple,
estimation precision is high, a calculation speed is fast, and the method can be widely applied to the estimation of the external network Thevenin equivalent parameters of any power line whose terminal is installed with the
data acquisition apparatus.