Abstract
An important development trend for modern power systems is the application of control algorithms for power converters based on a virtual synchronous generator (VSG), which can mimic the characteristics of the conventional synchronous generation and support the grid-forming operation. This paper proposes a modified current-controlled VSG structure (CC-VSG) with a feedforward controller consisting of a simple proportional loop, which is added to the VSG active power control loop, to improve the damping properties of CC-VSG, reduce the model order of this control system and simplify the approach to its tuning. In order to qualitatively and quantitatively analyse the effectiveness of the proposed solution, the paper presents a comparison of dynamic responses when using control algorithms based on CC-VSG or the traditional VSG structures, including several of their modifications. For this purpose, time-domain simulation of the considered system was performed, demonstrating the absence of impact of the feedforward control on the inertial response of CC-VSG, which can occur when using other VSG structures or local negative feedbacks within the CC-VSG itself.
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