Abstract
Voltage level selection is the foundation of planning and designing for flexible DC transmission with offshore wind power. Traditional voltage level selection method is largely dependent on the manufacturing level of DC cable and converter with having standardization or project experience. For flexible DC transmission with large-scale offshore wind power, the voltage level using the traditional selection method may be not the best. By studying calculation methods of main devices and system cost, under the condition of system capacity and length of DC cable known, system cost function with DC voltage and sub-module capacitor voltage as variables was built. Taking the lowest cost as a target, aiming at the low stability of the optimization results of the traditional genetic algorithm, an optimization design method of DC voltage level based on subsection searching genetic algorithm was proposed. The simulation model of flexible DC transmission with offshore wind power was built based on PSCAD/EMTDC. The AC fault ride-through of the converter station and the safety of the main equipment under the optimal DC voltage level was verified.
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