Experimental modeling demonstrates effective emergency frequency control in high-renewable power grids, indicating enhanced stability against sudden generator disconnections.
With the increase of new energy penetration rate and the growth of DC transmission capacity, the frequency characteristics of the power system have decreased, thus existing frequency control measures may not be able to match the original fault types effectively. To solve this problem, an effective method to control frequency stability is proposed in this paper. First, the new energy generation and DC input-and-output links are added to the traditional System Frequency Response (SFR) model, which can obtain an improved SFR (ISFR) model. The relationship between key dynamic frequency indicators and the proportion of new energy is evaluated, deriving the analytical expression of the lowest point frequency change. Then, a frequency stability emergency control method constrained by the frequency deviation safety threshold is proposed to avoid disorderly disconnection of new energy sources. Finally, an experiment using an actual power grid is conducted. The predicted frequency values are calculated, and emergency control measures are taken. The experimental results demonstrate the feasibility of the proposed control method.
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Yang et al. (2024) studied this question.
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