CONVERTER CONTROL METHOD AND CONTROL SYSTEM, COMPUTER DEVICE, AND STORAGE MEDIUM

This application provides a control method and a control system for a converter, and a computer device, applied to a flexible direct-current power transmission system. The flexible direct-current power transmission system includes one or more voltage source converters, and the control method includes: determining an inner potential of the converter, a phase, a grid-side voltage, a grid-side current of the converter, a constant impedance value, and a current limiting value of the converter; calculating a voltage reference value of a connection bus of the converter according to the inner potential, the phase, the constant impedance value, and the grid-side current of the converter; calculating a current instruction reference value according to an error between the voltage reference value of the connection bus and the grid-side voltage; and controlling, according to the current instruction reference value, a current of the converter to follow the current instruction reference value. The control method further includes an overcurrent limiting unit, and when the converter is in an instruction current-limiting mode, a current instruction reference value in the instruction current-limiting mode is calculated according to series inductance characteristics of a positive sequence voltage source and according to the grid-side voltage Us, the inner potential amplitude E, the phase θ, and the current limiting value Imax of the converter, and is used as the current instruction reference value.