Abstract
With the implementation of carbon emission reduction policies in various countries, the penetration rate of distributed generation (DG) has gradually increased. Flexible multi-state switch (FMS), has attracted more attention as a new power device. This paper analyzes the cascading failure risk of flexible interconnected distribution system caused by the hidden failure of FMS protection. Firstly, based on the physical structure of FMS, the transient characteristics of AC feeder failure and the control and protection strategy of FMS are analyzed. Then, the uncertain factors causing protection misoperation are put forward and modelled. On this basis, the mechanism of cascading failures formation is analyzed. The risk index of cascading failure in flexible interconnected distribution network and the optimal load shedding based on failure consequences are established. Finally, the risk of system cascading failure is evaluated by the improved IEEE 33-bus system. Also, the influence of fault location and DG penetration on the risk is analyzed.
Published Version
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