Abstract
With the improvement of the permeability of wind and photovoltaic (PV) energy, it has become one of the key problems to maintain the small-signal stability of the power system. Therefore, this paper analyzes the small-signal stability in a power system integrated with wind and solar energy. First, a mathematical model for small-signal stability analysis of power systems including the wind farm and PV station is established. And the characteristic roots of the New England power system integrated with wind energy and PV energy are obtained to study their small-signal stability. In addition, the validity of the theory is verified by the voltage drop of different nodes, which proves that power system integrated with wind-solar renewable energy participating in the frequency regulation can restore the system to the rated frequency in the shortest time and, at the same time, can enhance the robustness of each unit.
Highlights
With the exhaustion of fossil energy and the deterioration of the natural environment, renewable energy has attracted wide attention [1]
In order to further study the positive effect of the energy storage system on the PV station, based on the above case, this paper considers that the energy storage system is configured in the PV station connected to bus #2
The influence of wind power and photovoltaic energy on the stability of the power system is studied, and the main conclusions are as follows: (a) Based on the calculation of characteristic roots, it is proved that power system integrated with wind and solar energy participating in frequency regulation has better stability
Summary
With the exhaustion of fossil energy and the deterioration of the natural environment, renewable energy has attracted wide attention [1]. E stability of PV power generation under different power grid strength and control parameters is studied by means of eigenvalue analysis. Literature [14] studies the influence of a large number of wind power generation on small-signal stability and corresponding control strategies to alleviate this negative influence. Stability research can be carried out for different renewable energy sources, such as the wind power generation system, photovoltaic system, and micro hydropower system. The above analysis regards wind-solar and other renewable energy sources as a perturbation of the power system and does not consider their participation in the frequency regulation of the power system. Erefore, it is not effective in analyzing the stability of the power system in which wind-solar renewable energy participate in the frequency regulation. Comprehensive case studies are undertaken in Section 4. e different systems are discussed in Section 5 and Section 6 summarizes the main contributions of the paper
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