Transient Synchronous Stability Analysis of Parallel System of Grid-forming Converters Considering Current Limiting Switching
Under short-circuit faults in the power grid,the transient interaction of renewable energy grid-forming converters operating in parallel is significantly enhanced,which increases the risk of transient synchronous instability of the system.First,this paper establishes a transient interaction model for the parallel system of grid-forming converters.Based on the traditional stability theory of synchronous generators,the mechanism of transient interaction energy affecting the stability of converters is analyzed.It is further revealed that the power angle traction mechanism under the effect of the interaction energy will promote the stability of multiple converters to approach consistency or make the converter with poor stability to accelerate the instability.Therefore,this paper proposes a method for constructing the stability region of the parallel system of grid-forming converters considering current limiting switching.The influence of the operating status and control parameters of the converter on the system transient stability is analyzed through the stability region.Finally,the simulation and experimental results verify the correctness of the theoretical analysis.
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