The Research On State Estimation Of Power System

tn this paper , the least square algorithm is used to execute state estimation of DaQing oil fields power system.In the processing of measurement ,the measurement data always consists of measurement error by the influence of random disturbed signal and measurement error. It is necessary to process and revise the measurement data, and get it' s estimate value. State estimation used by Least Square algorithm is usually done at the condition of unknown of it' s statistic property .To make the estimate error least , this paper introduce weight function and use weight least square algorithm (WLS). The result of simulation shows that the precision of estimate result is highly enhanced and this method can satisfy the need of move and control of the power system.In the processing of high order nonlinear differential equation , this paper presents recursive least square algorithm to speed up the compute speed and guarantee the astringent. It can be included three points from the estimate result. Firstly, the square sum of estimate error is only half of it' s original square sum of measurement data, the precision of result is highly enhanced. Secondly, the precise estimate data takes place of bad data. Thirdly, this method estimate some data that the power system needs but the measure system do not give. Thus it supplies good information guarantee for power system .This paper also presents method of bad data detection and identification . The simulation shows satisfactory result.