The Nigerian power network over the years has suffered incessant power interruptions caused by inadequacies in power generation capacity, inadequate transmission, distribution facilities and poor maintenance culture and other disturbances. Therefore, this paper presents the application of a VSC-HVDC system for the improvement of the transient stability of the Nigeria 330kV transmission network. First, the buses that are marginally unstable (critical buses) in the network were determined through eigen value analysis of the system buses. Then, a balanced 3-phase fault was applied to the few critical buses and lines of the transmission network. By observing the dynamic response of the generators in the Nigeria 330kV grid, the existing transient stability situation was determined. The finding obtained vividly revealed that buses Olorunsogbo and Omotosho are the two most critical buses while transmission lines from Ikeja West - Olorunshogo Generating Station (GS) and Omotosho - Benin TS within the network are the most critical transmission lines. Also, when the balanced 3-phase fault was applied to these mentioned critical buses and lines, the network loses synchronism. To solve the problem, VSC-HVDC was installed at the identified lines that are marginally unstable. The conventional PI method was used to control the parameters of the VSC-HVDC converter and the converter in MATLAB/PSAT environment. The results obtained showed that the fault critical clearing time (CCT) was increased from 300milli-seconds to 400milli-seconds which is 33.33% increment. Also, the oscillations were quickly damped.
Aneke Jude I. , Umeozulu Ada S. , Eneh I. I. "Enhancing Transient Stability of Nigeria 330kV Transmission Grid Using a High Voltage Direct Current (HVDC)" Iconic Research And Engineering Journals Volume 5 Issue 8 2022 Page 172-186
Aneke Jude I. , Umeozulu Ada S. , Eneh I. I. "Enhancing Transient Stability of Nigeria 330kV Transmission Grid Using a High Voltage Direct Current (HVDC)" Iconic Research And Engineering Journals, 5(8)