%0 Journal Article
%T Real-Time State Estimation in the Cameroon Power System
%A Emmanuel Tanyi
%A Edwin Mbinkar
%J ISRN Power Engineering
%D 2013
%R 10.1155/2013/871827
%X An important tool for the energy management system (EMS) is state estimation. Based on measurements taken throughout the network, state estimation gives an estimation of the state variables of the power system while checking that these estimates are consistent with the measurements. Currently, in the Cameroon power system, state estimates have been provided by ad hoc supervisory control and data acquisition (SCADA) systems. A disadvantage is that the measurements are not synchronised, which means that state estimation is not very precise during dynamic phenomena in the network. In this paper, real-time phasor measurement units (PMUs) that provide synchronised phasor measurements are proposed for integration into the power system. This approach addresses two important issues associated with the power system state estimation, namely, that of measurement accuracy and that of optimization of the number of measurement sites, their location, and the importance given to their measurements on the dynamic state estimation. 1. Introduction The electricity sector in Cameroon has been undergoing gradual deregulation in the last few years. AES-SONEL, which took over the generation, transmission, and distribution of electricity in the country in 2001, disposes of a total installed capacity of 933£¿MW (721£¿MW from hydroelectricity sources and 212 from thermal sources including 24£¿MW of isolated capacity) [1]. The transportation network has 480£¿km of 225£¿kV lines, 337£¿km of 110£¿kV lines, and 1064£¿km of 90£¿kV lines, with 24 sub-stations. The need for better utilization of power system facilities has increased significantly in the last decade and will continue, as the electricity market is becoming more complex and competitive. More real-time data from substations and generating plants is required to support SCADA (supervisory control and data acquisition) and EMS (energy management system) in utility control centres. There has been a significant increase in interest in planning, operating, equipment, and maintenance personnel for real-time events and archived data. This wide interest demonstrates the need for the use of real-time state estimators. The system control centre in Mangombe is responsible for the load dispatch and reliability of the main 225£¿kV grid. Tanyi and Mbinkar have proposed that four area control centres can be located throughout the regions covering the southern interconnected grid (SIG) to be responsible for the operation and maintenance procedures on the transmission, subtransmission, and distribution networks in their respective areas [2]. There
%U http://www.hindawi.com/journals/isrn.power.engineering/2013/871827/