Resonance analysis using wavelet packet transform in clustered grid-connected PV system

With the growing permeability of parallel inverters in the grid, resonance problem has frequently appeared in new energy systems and seriously affected the power quality around the world. Besides, resonance analysis is attracting more and more attention recently. Therefore, resonance problem of the clustered grid-connected photovoltaic (PV) system is urgent to be studied. To solve this problem, this paper analyzes the resonance detection principle. Moreover, wavelet packet transform principle is also analyzed. And resonance detection method is proposed based on wavelet packet transform. Finally, an algorithm is proposed in this paper to detect the resonance in traditional grid-connected PV system and clustered grid-connected PV system. Simulations verify the effectiveness of the proposed method for resonance problem in clustered grid-connected PV system.

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