This paper analyzes four types of electrical faults that are prone to occur in flywheel energy storage systems, and proposes an improved fault-tolerant topology with independent control of each phase current. Compared with the traditional fault-tolerant topology in which the neutral point of the motor is connected to the midpoint of the DC terminal of the inverter, the improved topology can still operate stably in the event of an open circuit fault in the drive motor winding or an open circuit or short circuit fault in a single tube of the inverter device. This paper makes a detailed analysis of the proposed fault-tolerant topology and control strategy and gives simulation results. Abstract:The paper analyzes four common electrical faults in flywheel energy storage system (FESS). On the basis of analyzing the advantages and disadvantages of a traditional fault-tolerant topology with leading-out mode of neutral point access to the center point of the DC bus, an improved fault-tolerant topology and operation strategy with phase currents separately controlled are presented. Whenever one phase open-circuit winding fault, open transistor fault or shorted transistor fault occurs, FESS still works stably. The improved topology and control schemes are analyzed in detail, and proved by simulation results.Keywords:Flywheel energy storage system; fault-tolerant; current regulation
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