Control method for DC bus voltage of two-stage inverter

The invention proposes a control method for a DC bus voltage of a two-stage inverter. A DC/AC inverter unit adopts a voltage outer ring to stabilize the DC bus voltage; an AC grid-connection current inner ring is used for achieving unity power factor running of a grid-connected current; a DC/DC unit adopts the voltage outer ring to achieve maximum power tracing; the current inner ring is used for achieving rapid and stabile running of a DC-side current; a DC bus voltage control strategy is added on the basis; in DC/DC, the output ability of a front stage is dynamically adjusted by the DC bus voltage control strategy; when the DC sub voltage is pulled down, the output ability of the front stage is enhanced by the DC bus voltage control strategy, and the DC bus voltage is increased; and when the DC bus voltage is pulled up, the output ability of the front stage is reduced by the DC bus voltage control strategy, and the DC bus voltage is reduced. Therefore, the stable running of the DC bus voltage is achieved by the DC bus voltage control strategy.