POWER SYSTEM AND METHOD FOR CONTROLLING POWER SYSTEM

A power system includes a plurality of power converters including a power conversion unit that converts a power that is input and outputs the converted power, a controller that controls the power conversion unit and executes control on the output that is primary control based on a reference function having a drooping characteristic defined according to an input value and a voltage or a power of a bus to which the power conversion unit is connected, and an update unit that updates a control method on the output; and a central control device that executes secondary control of controlling the power converter, wherein the central control device performs the secondary control on the power converter according to an update instruction to update the control method, and the update unit updates the control method according to the update instruction that is output from the central control device and updates the control method such that there is always at least one of the power converters that performs voltage control in a period in which the power converters update the control method.