Multi objective dynamic economic dispatch with renewable energy and HVDC transmission lines

HVDC systems have recently found increasing importance in integration of Renewable energy (RE) into the grid for they provide long distance bulk power transmission by overhead lines with various economic advantages. The proposed 1045 km, 500kV HVDC Ethiopia - Kenya Bipole will provide transmission of Wind power from the Lake Turkana Wind Power Project (LTWWP) to Juja Substation in Nairobi, Kenya. In this paper, multi objective dynamic economic dispatch (MODED) with RE and HVDC transmission lines is proposed. All the possible AC and DC constraints are also formulated and considered. Probalistic load flow (PLF) is used to determine the HVDC, RE and other system parameters while the uncertainties and variability of the renewable sources are modelled using scenario based method (SBM). The problem is then solved using Improved Genetic Algorithm(IGA). For MODED with RE, HVDC lines have a better ability to control power flow, decrease transmission line losses and increase the capability to maintain voltage stability. There has to a trade-off between the environmental benefits and slight increase in optimal cost in using HVDC grids.