Power System Stability Improvement of Ghana’s Generation and Transmission System Using FACTS Devices
Journal of Electrical and Electronic Engineering
Volume 8, Issue 2, April 2020, Pages: 47-63
Received: May 5, 2020;
Accepted: Jun. 9, 2020;
Published: Jun. 20, 2020
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Lawrence Aikins, Engineering and Maintenance Department, Takoradi Thermal Power Plant 2, Takoradi, Ghana
Christian Kwaku Amuzuvi, Department of Renewable Energy Engineering, University of Mines and Technology, Tarkwa, Ghana
Power system stability is a major challenge in the secured operation of today’s interconnected power systems. Voltage stability as a branch of power system stability, is a major problem facing power systems in Ghana. The power system is subjected to major blackouts or collapses due to voltage instability. It is manifested by several distinguishing features: low system voltage profiles, heavy reactive line flows, inadequate reactive support, and heavily loaded power systems. Voltage stability depends on the ability of a power system to maintain acceptable voltage for system buses under normal conditions, and system disturbances. This paper evaluates the steady-state voltage stability of the power system through modelling and simulation using the Power System Simulator for Engineering power system analysis software and the results validated with MATPOWER. Load flow simulations using the Newton Raphson method under steady-state base load condition with and without contingencies were done. Simulation results revealed under normal, and contingency cases show the power system has voltage profile, that violates the voltage stability constraint of between 0.95 pu and 1.05 pu for normal system voltage, high transmission system losses and heavy congestion. The Flexible Alternative Current Transmission System (FACTS) devices was used to improve the power system stability. Three types of FACTS devices: SVC, STATCOM, and TCSC are selected and optimally placed in the power system to improve voltage stability. Generic algorithm as artificial intelligence-based method was used in MATLAB environment to optimally size and locate five (5) FACTS devices; one (1) STATCOM and four (4) SVC in the power system. The algorithm was found to be reliable as it yielded good results by the improvement in voltage stability and decreasing the transmission line active and reactive power losses significantly.
Christian Kwaku Amuzuvi,
Power System Stability Improvement of Ghana’s Generation and Transmission System Using FACTS Devices, Journal of Electrical and Electronic Engineering.
Vol. 8, No. 2,
2020, pp. 47-63.
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