real time simulation

With a large number of all-controlled switching devices of converters in MMC-HVDC system and the frequency-dependent characteristics of line impedance in the electromagnetic transient model of HVDC transmission line, the real-time simulation platform calls for subtle time step and high calculation accuracy. The calculation parameters are prestored in advance so that they can be obtained by looking up tables in the calculation process, which reduces the computational load of simulation calculation of MMC-HVDC system.