Abstract
This paper considers the use of the inherent structural characteristics of power system networks for improving the reactive power reserve margins for both topologically weak and strong networks. The inherent structural characteristics of the network are derived from the Schur complement of the partitioned Y-admittance matrix using circuit theory representations. Results show that topologically strong networks, operating close to the upper voltage limit could be made to increase their loadability margin by locating reactive power compensators close to generator sources, whereas topologically weak (ill conditioned) networks could be made to operate within the feasible operating limits by locating reactive power compensators on buses farther from generator sources.
Highlights
Transmission network plays a critical role in power systems operations
This paper considers the use of the inherent structural characteristics of power system networks for improving the reactive power reserve margins for both topologically weak and strong networks
Results show that topologically strong networks, operating close to the upper voltage limit could be made to increase their loadability margin by locating reactive power compensators close to generator sources, whereas topologically weak networks could be made to operate within the feasible operating limits by locating reactive power compensators on buses farther from generator sources
Summary
Transmission network plays a critical role in power systems operations. Its role in ensuring reliable operations of power systems was acknowledged after post-mortem analysis of major blackouts in many advanced countries [1]. The concept of using transmission networks inherent structural characteristics to resolve power systems operational issues has not been fully considered. Transmission networks with excess reactive power are in general topologically strong networks and have network bus voltages that are very high beyond the nominal limit. Different buses on the network affect the network operations differently because of the nonlinearity of the network parameters [16] Because of these challenges, there is the need to reconsider the fundamental circuit theory properties of network, in order to identify its inherent structural characteristics that could be used to achieve better reactive power management. This paper focuses on the inherent structural characteristics of power system networks as a solution guide to the issue of reactive power reserve management.
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