MMC-BASED ELECTROMECHANICAL TRANSIENT SIMULATION METHOD AND SYSTEM FOR VOLTAGE SOURCE CONVERTER-BASED HIGH VOLTAGE DIRECT CURRENT AND DIRECT CURRENT POWER GRID

摘要

An MMC-based electromechanical transient simulation and modeling method and system for a voltage source converter-based high voltage direct current (VSC-HVDC) and direct current power grid. The method comprises: establishing a transient simulation model comprising a steady-state trend model based on a controlled current source, an alternating current transient model, and a direct current transient model, wherein the steady-state trend model based on the controlled current source is employed to generate initial trend data required for a transient simulation (S1); and simulating, by means of the transient simulation model, an electromechanical transient operation characteristic of a VSC-HVDC and direct current power grid in different operation conditions (S2). By not taking initial value computation of a direct current power grid into consideration, the method and system simplify the steady-state trend model without influencing accuracy and stability of transient simulation, and improve expandability of the model.