KEYWORDS: Control systems, Frequency response, Seaborgium, Frequency modulation, Mathematical modeling, Device simulation, Design and modelling, Tunable filters, Renewable energy
The continuous access of renewable energy and distributed generation threatens the frequency security of microgrid. The frequency regulation capability of microgrid is greatly reduced. To improve the frequency stability of the microgrid based on energy storage, it is very important to adopt an appropriate frequency regulation method, which needs further research. Firstly, the principle of the virtual synchronous generator (VSG) is described, and the virtual power frequency and the virtual excitation controller are introduced. Thereafter, in order to improve the shortcomings of the traditional droop control, the frequency response is introduced to improve the droop control. Finally, the frequency regulation methods based on VSG, droop control, and improved droop control are simulated and compared. The results show that the frequency response link effectively improves the system stability. Among the three frequency regulation methods, the VSG performs the best frequency regulation speed as well as stability.
KEYWORDS: Control systems, Systems modeling, Modal analysis, Californium, Signal attenuation, Rutherfordium, Resistance, Inductance, Simulink, Seaborgium
Virtual synchronous generators (VSG) technology can improve the inertial supportability of the new power system. However, its support characteristics are easily to cause low-frequency oscillation of the system, and there is a lack of corresponding mechanism analysis. Aiming at the problem of low-frequency oscillation in VSG grid-connected system, the small-signal model of VSG grid-connected system is established by state space method, and the influence of system parameters on low-frequency oscillation mode is identified by root locus method. The correctness of the conclusion is verified by Matlab / Simulink time-domain simulation. The results show that increasing the moment of inertia of VSG, the characteristic root of low-frequency oscillation mode moves to the right of the coordinate system, which is not conducive to the stability of the system. Increasing the damping coefficient and reducing the voltage level, the corresponding characteristic root moves to the left of the coordinate system, which is conducive to improving the stability of the lowfrequency oscillation mode of the system.
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