Automatic Generation and Initialization of EMT Simulation Models for Large-Scale AC-DC Hybrid Power System

High penetration of high voltage direct current (HVDC) and renewable energy increase power electronic devices in power grid, and it demands electromagnetic transient (EMT) simulation for power grid analysis and assessment. However, it is difficult to establish the EMT model of a large-scale power system with HVDC system. Determining start-up power flow of HVDC system and dynamic load is also difficult. Using the parameters of the corresponding electromechanical transient model, this paper proposes the approach for generating the EMT model of HVDC system and dynamic load. A smooth start-up method is also applied to determine HVDC system and dynamic load power flow start-up status. A large-scale practical power system with HVDC system is modelled in CloudPSS EMT simulation platform to test the proposed conversion and start-up method. The testing results confirm the transforming method and the start-up method.