Control of a DC Transmission System using an Hydraulic Turbine-synchronous Generator as Power Supply

L. Teppoz, G. Bornard, and G. Besançon (France)


HVDC, VSC, hydraulic turbine, synchronous generator, transmission line, interconnected systems, nonlinear con trol, optimal control.


This paper proposes a control scheme for an HVDC sys tem composed by an hydraulic turbine, a generator, a trans mission line and an infinite bus interconnected together through VSC actuators. Those actuators are described by a continuous time average model defined on one switching period. The paper deals with the synchronous angular speed reg ulation, the DC bus voltage regulation and the DC cur rent tracking, in order to keep generator synchronism and to guarantee some given power transmission. These tar gets are achieved by a non linear control of the mechanical power and a linear optimal control of the line from the cur rents generated by the converters at each end, and appro priate regulation of those currents.

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