Transient synchronous stability analytic analysis method for network construction type MMC (Modular Multilevel Converter) grid-connected system

The invention discloses a transient synchronous stability analytic analysis method for a network construction type MMC (Modular Multilevel Converter) grid-connected system, which comprises the following steps of: establishing a power synchronous ring grid-connected transient synchronous stability model based on a power synchronous ring kinetic equation, and analyzing the influence of power synchronous ring parameters of an MMC on the transient synchronous stability of the system by using the model. The analytical calculation method of the critical clearing angle and the critical clearing time of the system can be further researched, and the transient synchronous stability improvement control strategy of the MMC is designed. Therefore, the transient synchronization stability analysis and calculation method can quantitatively evaluate the transient synchronization stability of the system under the condition that the system parameters are determined, thereby providing reference for time setting of the relay prot