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1887

access icon free Searching severest VSM basing on CCPF among multiple dispatch centres

© The Institution of Engineering and Technology
Received 20/03/2017, Accepted 02/10/2017, Revised 07/09/2017, Published 04/10/2017

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.

Inspec keywords: power grids; Jacobian matrices; power system security; power system stability; power system economics; load flow; power system interconnection; load dispatching

Other keywords: centralised continuation power flow; Jacobi matrix; CCPF; system-level voltage stability; coordinated CPF; secure operation constraints; regional power grids; real power grid; multiple dispatch centres; interconnected power system; China; security enhancement; boundary power injection; voltage stability margin; distributed VSM searching method; distributed power flow model; IEEE 118 bus system

Subjects: Power system control; Algebra; Power system management, operation and economics

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