Simulation study demonstrates peak torsional torque behavior in motor-generator pairs, highlighting mechanical stress risks during rapid battery charging and reclosing faults.
As a method for maintaining power system stability, an M-G pair that combines a synchronous motor (M) and a synchronous generator (G) driven by renewable energy sources and battery storage has been proposed. This approach incorporates a battery control scheme that rapidly charges the batteries during transmission line faults (hereafter referred to as GTE (generator tripping emulation)). Similar to generator tripping, this scheme reduces the power flow on transmission lines and thereby contributes to transient stability. The GTE may induce significant torsional torque in the M-G pair due to rapid changes in active power. While torsional torque during high-speed reclosing failure is typically a concern for turbine generators, M-G pair can be subjected to both high-speed reclosing failure and GTE. Therefore, it is necessary to clarify the nature of the torsional torque induced in the M-G pair under both types of disturbances.
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Aoki et al. (2026) studied this question.
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