A distribution system state estimator accommodating large number of ampere measurements |
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| Affiliation: | 1. College of Information Science and Engineering, Northeastern University, Shenyang, Liaoning, China;2. The Institute of Advanced Technology, Nanjing University of Posts and Telecommunications, Nanjing, Jiangshu, China;3. Key Lab.of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, Liaoning, China;1. Northeastern University, College of Information Science and Engineering, Shenyang, Liaoning, PR China;2. Northeastern University, Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Shenyang, Liaoning, PR China;3. Research Institute of Advanced Technology, Nanjing University of Posts and Telecommunications, Nanjing 210003, PR China |
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| Abstract: | This paper presents a three-phase state estimation method for distribution network which can accommodate large number ampere measurements and voltage measurements. In this method, the power on sending end of branch and the square of branch current magnitude are chosen as the state variables. Therefore, measurement functions of ampere and voltage measurements are significantly simplified and no measurements transformation is needed in this method. Furthermore, a novel robust state estimation model is presented, which can suppress bad data automatically. The observability analysis indicates the proposed method can be used in distribution system with very limited measurements. Numerical tests on radial and weak-meshed network show the real-time branch current measurements can significantly improve the accuracy of estimation results. |
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