Abstract:
The invention is concerned with a method, computer program and computer program product for determining a synchronizing angle for a processing plane comprising a first axis and a second axis, a controller for controlling a voltage source converter and a converting arrangement comprising a voltage source converter and a controller. The controller (10, 52') processes an ac voltage error ( E d - E ref ), which ac voltage error ( E d - E ref ) is the error of a voltage component ( E d ) along the first axis of an ac voltage (E) at an ac side of the voltage source converter (64), and determines a synchronization angle ( θ ) for the processing plane based on the processed ac voltage error i a ref .
Abstract:
A method of controlling a grid-connected voltage source converter, VSC, using power-synchronisation control, wherein the method comprises: determining an active power control error, determining a VSC phase angle based on an integration of a sum including a scaled active power control error and a scaled imaginary part of a voltage of common coupling, determining a damping component based on a virtual damping resistance, a VSC current vector and a reference current vector for the VSC current vector, determining a voltage vector based on a VSC voltage magnitude and the damping component, transforming the voltage vector to a current vector, comparing a magnitude of the current vector with a maximum threshold current value, and in case the magnitude of the current vector is greater than the maximum threshold current value: reducing the magnitude of the current vector to a value below the maximum threshold current value to obtain a limited current vector, transforming the limited current vector to a limited voltage vector, controlling the VSC based on the VSC phase angle and the limited voltage vector, multiplying an imaginary part of a voltage of common coupling with a gain to obtain a scaled imaginary part of voltage of common coupling.