Power System State Estimation Using Weighted Least Squares (WLS) and Regularized Weighted Least Squares(RWLS) Method
نویسندگان
چکیده
In this paper, a new formulation for power system state estimation is proposed. The formulation is based on regularized least squares method which uses the principle of Thikonov’s regularization to overcome the limitations of conventional state estimation methods. In this approach, the mathematical unfeasibility which results from the lack of measurements in case of ill-posed problems is eliminated. This paper also deals with comparison of conventional method of state estimation and proposed formulation. A test procedure based n the variance of the estimated linearized power flows is proposed to identify the observable islands of the system. The obtained results are compared with the results obtained by conventional WLS method
منابع مشابه
Modified Weighted Least Squares Method to Improve Active Distribution System State Estimation
The development of communications and telecommunications infrastructure, followed by the extension of a new generation of smart distribution grids, has brought real-time control of distribution systems to electrical industry professionals’ attention. Also, the increasing use of distributed generation (DG) resources and the need for participation in the system voltage control, which is possible ...
متن کاملThe Performance of Robust Weighted Least Squares in the Presence of Outliers and Heteroscedastic Errors
The Ordinary Least Squares (OLS) method is the most popular technique in statistics and is often use to estimate the parameters of a model because of tradition and ease of computation. The OLS provides an efficient and unbiased estimates of the parameters when the underlying assumptions, especially the assumption of contant error variances (homoscedasticity), are satisfied. Nonetheless, in real...
متن کاملIteratively reweighted least-squares implementation of the WLAV state-estimation method - Generation, Transmission and Distribution, IEE Proceedings-
An implementation of the weighted least absolute value (WLAV) method for obtaining an estimate of the state of the power system is presented. Most of the known WLAV methods use some form of linear programming software to find the best estimate. The paper shows that it is possible to obtain aWLAV estimate by simply applying the Newton-Raphson method to the set of equations that yield the critica...
متن کاملFast solver for some computational imaging problems: A regularized weighted least-squares approach
In this paper we propose to solve a range of computational imaging problems under a unified perspective of a regularized weighted least-squares (RWLS) framework. These problems include data smoothing and completion, edgepreserving filtering, gradient-vector flow estimation, and image registration. Although originally very different, they are special cases of the RWLS model using different data ...
متن کاملA Robust WLS Power System State Estimation Method Integrating a Wide-Area Measurement System and SCADA Technology
With the development of modern society, the scale of the power system is rapidly increased accordingly, and the framework and mode of running of power systems are trending towards more complexity. It is nowadays much more important for the dispatchers to know exactly the state parameters of the power network through state estimation. This paper proposes a robust power system WLS state estimatio...
متن کامل