KEYWORDS: Power grids, Photovoltaics, Transformers, Power supplies, Solar energy, Safety, Analytical research, Medium wave, Superposition, Power consumption
For accurate evaluation of large urban power grid of distributed photovoltaic carrying capacity, the article in the grid operation characteristics of power supply, power, short circuit current, power quality, voltage deviation and loss and relay protection six aspects on the analysis of the large urban power grid characteristics of distributed photovoltaic bearing capacity calculation evaluation method, and in large urban power grid, for example, to verify its feasibility and practicability. The results show that this method can accurately evaluate the 10-220 kV bus of the power grid, which provides strong guidance for the planning, construction and operation analysis of distributed PV access to large urban power grid.
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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