In order to analyze the influence of Ultra High Voltage Direct Current（UHDVC） power transmission accessing from Jinping to southern Jiangsu on Jiangsu power grid accurately

especially the operation of the southern Jiangsu power grid nearby Tongli converter station

based on predicted summer peak data of Jiangsu power grid for the year 2013

the electromagnetic transient model of the DC transmission from Jingpin to southern Jiangsu and the electromechanical model of remaining Jiangsu power grid was built by Advanced Digital Power System Simulator（ADPSS）. The steady-state of Jiangsu power grid with UHDVC accessing was verified using the electromechanical-electromagnetic hybrid simulation model. The transient simulation results of using the electromechanical-electromagnetic hybrid model and the pure electromechanical model were compared in the case of bipolar blocking. Simulation results show that the hybrid model the UHVDC transmission system’s operating characteristic from Jingpin to southern Jiangsu can be reflected effectively

it’s suitable for researching the complex and fast transient process in the DC system. The hybrid simulation model lay the foundation for the study of impacts of UHDVC power transmission accessing from Jinping to southern Jiangsu on stability of receiving-end system in Jiangsu power grid.