A method for analyzing the problem of frequent wideband oscillations in grid-connected renewable energy generation systems based on small-world (SW) networks and fast-slow dynamics is proposed, where the mechanism of bursting oscillations in complex power systems has been examined. A direct-driven permanent magnet synchronous generator (DPMSG) and a complex network consisting of multiple DPMSGs connected to the grid were chosen as examples in order to discuss the process of bursting oscillations in a single system with both alternating large-amplitude and micro-amplitude oscillations due to the multi-timescale coupling effect introduced by the disturbance. The process of bursting oscillations in generation nodes spreading among the system nodes, which leads to successive chaotic oscillations of each node of the whole system, was also investigated. The results showed that the bursting oscillations created by the nodes in power generation in grid-connected renewable energy generation systems can lead to oscillation instability of the entire system. Our simulation verified the feasibility and effectiveness of the method proposed in this paper.
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