Abstract
Virtual synchronous generator (VSG) is one of the inverter control methods which can provide extra virtual moment of inertia and achieve frequency support by mimicking the output characteristics of a rotating synchronous generator (RSG), which makes VSG particularly suitable for multi-access point applications, or called the multi-VSG system. However, frequency fluctuations may often occur in the case of power variation. In terms of this issue, this study presents the small-signal state-space model of VSG and analyzes the cause of frequency fluctuation, first. And then, a novel VSG control method is proposed for frequency fluctuation attenuation. The proposed method is especially fit for the parallel multi-VSG system because it does not take grid angular frequency into computation so that it can get rid of the ill effect introduced through PLL. The damping power item is reconstrued with a new means to judge whether the system is in a steady state or not. At the same time, the parametric design method of the proposed method is also figured out. Finally, the simulation experiments are performed, and the results verify that the proposed method performs better than the conventional one in terms of dynamic response and power-sharing among the multi-VSG system.
Highlights
In recent years, with the development of distributed energy resources (DERs) and microgrids (DG), more and more power electronic devices have been added to the grid
The addition of the extra term intends to achieve better oscillation damping in a multi-virtual synchronous generator (VSG) environment
Four different control methods are applied in the same situation to compare the active power oscillation and angular frequency fluctuation
Summary
With the development of distributed energy resources (DERs) and microgrids (DG), more and more power electronic devices have been added to the grid. Huge challenges, such as the problem of lack of inertia, damping, and rotational reserve capacity, have emerged with a large number of power electronic equipment. VSG strategy has been introduced in frequency, voltage, and active and reactive power flow control (Wang et al, 2020). VSG control strategy has been applied to different devices and occasions, such as energy storage (Ma et al, 2017), doubly fed induction generators (Hwang et al, 2017), high-voltage
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