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摘要
The resonance between VSC-HVDC and HVAC systems has the new characteristics of high frequency and wide frequency domain. In order to study the effect of harmonic injection on the vibration of a 500 kV connected transformer core, a finite element model of electromagnetic-structural force field is established for the winding and core of the connected transformer. Considering the effects of magnetostriction and Lorentz force, the magnetic flux density, stress distribution, vibration displacement and acceleration of the transformer core are obtained through simulation calculation. Simulation results in the condition of fundamental frequency and harmonic show that: 1) the magnetic flux distribution of the transformer core does not change significantly before and after harmonic injection; 2) after harmonic injection, the stress distribution of the core changes obviously, and the maximum stress increases by two orders of magnitude; and 3) the maximum vibration frequency under fundamental frequency is 100 Hz, and the maximum vibration appears around 2 500 Hz after high-order harmonic injection. ? 2019, Xi'an High Voltage Apparatus Research Institute Co., Ltd. All right reserved.
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