Energy storage system and direct current bus voltage stability control method

The invention discloses an energy storage system DC bus voltage stability control method. The method comprises the following steps: S1, calculating a load abrupt change grade of each phase and obtaining a total load abrupt change grade; s2, calculating a voltage jump grade of the direct current bus; s3, generating a bidirectional DC-DC regulation level according to the total load abrupt change level and the bus voltage abrupt change level; s4, generating inner and outer ring parameters of the bidirectional DC-DC according to the bidirectional DC-DC regulation level; and S5, performing bidirectional DC-DC loop control according to the inner and outer loop parameters. The inner and outer ring parameters in the bidirectional DC-DC loop are adaptively modified by combining the load abrupt change level and the bus voltage abrupt change level, so that the control parameters are dynamically adjusted along with the size of the abrupt change level, the bus voltage recovery time is short, and the system can quickly rea