Abstract
In view of the photovoltaic grid-connected power system, the transient frequency stability of the system is analyzed in this paper. First, the photovoltaic grid-connected power system was modeled and analyzed. On this basis, the maximum frequency deviation is used as the index to determine the interval in which the system accommodates the maximum photovoltaic capacity, and the influence of frequency stability of the high-permeability photovoltaic high disturbance system is studied. Second, the evaluation and prediction methods of frequency dynamic characteristics of photovoltaic access nodes based on surface fitting are proposed, and the critical values of high penetration photovoltaic access for different grid points are given. Finally, an improvement measure based on the optimization of the frequency modulation parameters of large-capacity units is proposed, and the effectiveness of the proposed method in improving the transient frequency stability of the system after photovoltaic access is verified by the IEEE 39-standard system.
Highlights
Solar photovoltaic technology, as a universal and endless clean energy power generation method with the largest utilization potential, has attracted the attention of power practitioners and researchers
Photovoltaic output is characterized by randomness, intermittence, no mechanical rotational inertia, and no participation in system frequency modulation, which brings new challenges to power grid control, making it difficult for the existing control mode to ensure the safety of power system
With the increasing proportion of photovoltaic power generation capacity in the total installed capacity of power systems, photovoltaic output is featured by randomness, intermittentness, no mechanical inertia, and “electric power electronics”, which makes the control of power grids more complex and profoundly changes the transient frequency stability characteristics of the system
Summary
As a universal and endless clean energy power generation method with the largest utilization potential, has attracted the attention of power practitioners and researchers. Stability improvement measures are concerned with feasible measures for frequency modulation after photovoltaic grid connection, which has practical significance for the safe and stable operation of power systems. With the promotion of microgrid technology, research on its control [1, 2] and other aspects is aimed at achieving flexible and efficient applications of distributed energy in various forms and huge quantities. Jingang Lai and his colleagues [3] proposed a cluster-oriented cooperative control strategy for multiple AC microgrids clusters, which enables maximum utilization of distributed energy resources
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