A Comparative Analysis and Simulation of the HVA Current and HVD Current connectivity of Bonny Island to the National Grid

The study presented a comparative analysis and simulation of high voltage alternating current and direct current transmission network (a case study of transmission network connectivity of Bonny Island to Afam independent power project (IPP), Rivers State, Nigeria. This objective was achieved by obtaining the necessary data on power transformer and the route length from Afam IPP generating station to Bonny Island, the transformer current, the transformer loading, the active power, the reactive power, the apparent power, the complex power, the power factor and the phase voltage on each transformer on the network, the busbar current, the cable size, conductor resistance, the cross sectional area of the conductor, the voltage drop on each Buses, and the resistance of line per Kilometer, the components of the HVDC link (the rectifier and the inverter) were determined. Voltage stability technique was use in implementing the HVAC and HVDC transmission network. Electrical Transient Analyzer Program (ETAP 19.0.1) simulation software was used in designing transmission network. Newton-Raphson method was utilized in the achievement of the optimal load flow analysis of the network. The comparative analysis of HVAC and HVDC transmission network were performed, which indicate that the HVDC transmission network had 0.629Mvar different from the HVAC on Bus6 and Bus7. In conclusion HVDC transmission network was better-off than the HVAC network for the connectivity of Bonny Island to the national grid.