A Temporal-spatial Distribution Characteristics Based HVDC Transmission Line Model and Its Influence Analysis

Due to the reverse geographical distribution between the main power consumption areas and energy production bases in China, several HVDC transmission lines have been built. Different from AC system, resistance parameter is the main factor affecting the electrical quantity of DC system. In order to consider the influence of DC resistance on system analysis, the thermal balance process of transmission line is analyzed in detail in this paper. By considering the temporal-spatial distribution of meteorological environment, the HVDC transmission line is modeled finely, and a DC transmission line modeling method is proposed. On the basis, the corresponding power flow calculation method for AC/DC hybrid systems is presented. Finally, to verify the impact of the proposed model, an AC/DC hybrid model is built based on PSASP simulation software. By calculating the DC line resistance under different temporal-spatial environment influences, the influence of the model on the operating state of AC/DC hybrid system is analyzed. The simulation results show that calculating the resistance under different temporal-spatial conditions is helpful to improve the accuracy of power system analysis.