Electromechanical transient simulation method and system for direct current capacitor of wind turbine generator

The invention discloses an electromechanical transient simulation method and system for a direct-current capacitor of a wind turbine generator, and belongs to the technical field of electromechanical transient simulation of a power system. The method comprises the following steps: correcting a capacitance basic value to obtain a corrected capacitance basic value; judging whether the wind turbine generator enters a high-voltage ride-through state or a low-voltage ride-through state; based on a preset correction principle and the direct-current voltage switching constant value, correcting the capacitance value to obtain a corrected capacitance value; and performing the electromechanical transient simulation through the determined capacitance value. Compared with the condition that the direct current capacitance is not considered, the method is closer to the actual equipment characteristics, the Chopper switching process and the direct current voltage dynamic process can be simulated, and the power value after a