Provided are a direct-current bus voltage reference value adjustment method and apparatus, and a photovoltaic grid-connected inverter. The method comprises: determining a bus voltage stabilizing value of a photovoltaic grid-connected inverter according to preset parameters, wherein the pre-set parameters at least comprise: a grid interconnection point voltage module value of a power grid and a modulation coefficient of the photovoltaic grid-connected inverter; and when determining that a high voltage fault occurs in a power grid corresponding to the photovoltaic grid-connected inverter, adjusting a direct-current bus voltage reference value of the photovoltaic grid-connected inverter to the bus voltage stabilizing value. Using the above-mentioned technical solution solves the problem in the existing technology that accuracy and controllability are low in an adjustment strategy where a direct-current bus voltage reference value of a photovoltaic grid-connected inverter is directly increased to a limit value, improving the accuracy and controllability of the adjustment strategy.
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