Decentralized state estimation for hybrid AC/DC microgrids

• Main Authors: Xia, Nan, Gooi, Hoay Beng, Chen, Shuaixun, Hu, Wuhua
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2020
• Subjects: Engineering::Electrical and electronic engineering; Decentralized State Estimation; Dual Decomposition
• Online Access: https://hdl.handle.net/10356/140227
• Institution: Nanyang Technological University

This paper presents a decentralized state estimation (SE) for the newly emerging hybrid ac/dc microgrid. The microgrid consists of an ac and a dc network which are connected via the interlinking ac/dc converter. The proposed SE is able to estimate the state variables of both networks in a decentralized way that the estimation is separately conducted while only limited information is exchanged during the process. The dual decomposition approach is adopted as the decentralized technique in this paper. Simulation results suggest that the proposed decentralized SE performs comparably to the centralized SE for the hybrid ac/dc microgrids in terms of accuracy, convergence, and robustness.