Searching severest VSM basing on CCPF among multiple dispatch centres. Issue 6 (31st January 2018)

• Record Type: Journal Article
• Authors: Ren, Zhengwei; Chen, Ying; Huang, Shaowei; Zhang, Lu
• Is Part Of: IET generation, transmission & distribution. Volume 12:Issue 6(2018)
• Page Start: 1285
• Page End: 1293
• Publication Date: 2018-01-31
• Subjects: power grids -- power system interconnection -- power system security -- power system stability -- power system economics -- load flow -- load dispatching -- Jacobian matrices; CCPF -- multiple dispatch centres -- voltage stability margin -- interconnected power system -- secure operation constraints -- centralised continuation power flow -- regional power grids -- distributed VSM searching method -- coordinated CPF -- distributed power flow model -- system‐level voltage stability -- Jacobi matrix -- boundary power injection -- IEEE 118 bus system -- China -- real power grid -- security enhancement; Electric power production -- Periodicals; Electric power transmission -- Periodicals; Electric power distribution -- Periodicals; 621.3105
• DOI: 10.1049/iet-gtd.2017.0450
• Languages: English
• ISSNs: 1751-8687

Abstract

Abstract : It is important to search voltage stability margin (VSM) of an interconnected power system in order to determine secure operation constraints. Traditionally, centralised continuation power flow (CPF) is used, which may fail to model the varied load growth directions of different regional power grids. In this study, a distributed VSM searching method is proposed grounding on a coordinated CPF (CCPF) performed by neighbouring dispatch centres. First, a distributed power flow model for VSM is established, which considers the automatic allocation of network loss. Then, a critical bus of the power system is used to indicate the system‐level voltage stability. It is chosen according to the sensitivity of the minimum singular value of Jacobi matrix to nodal voltage amplitudes, and the sensitivity of boundary power injection to nodal voltage amplitudes. Moreover, the gradient of critical bus voltage amplitude to regional loading parameters is computed, which is set as the load growth direction for the current step. The severest VSM is obtained by solving the CCPF iteratively along the worst load growth direction. Tests on IEEE 118 bus system and a real power grid of China validate the proposed method in the enhancement of the security for interconnected power systems.