Abstract
The main factors of stress distribution in MCRs are the magnetostriction effect of the core materials and the magnetic force between gaps under DC bias excitation. This article developed a coupling model for MCRs considering Maxwell magnetic force and magnetostriction under DC flux density biases. The constitutive equations of the magnetic field and strain field are constructed based on the magnetic property curves with a new measured and analyzed method to consider DC magnetic flux biases, which is the key contributions of this study. Then, the electromagnetic vibration properties of the MCR model are calculated and analyzed. To prove the validity of the proposed method, the vibration of a 4.4 kVar-220 V MCR is tested and analyzed.
Highlights
High-Power magnetically controlled reactor (MCR) is a shunt static device that is widely used in high-voltage grids for the compensation of reactive power at the point of common coupling (PCC)
The main drawback of the MCRs is the significant mechanical vibration it exhibits because of the near magnetically saturated working conditions under AC and DC excitations, which result in low-frequency noise pollution, fastener loosening, and power grid faults [2], [3]
The mechanical vibration of MCRs has become an issue that restricts its utilization at full capacity
Summary
High-Power magnetically controlled reactor (MCR) is a shunt static device that is widely used in high-voltage grids for the compensation of reactive power at the point of common coupling (PCC). The magnetostrictive force is distorted in the airgap of the iron core when the magnetic field tends to saturate which signifies the electromagnetic vibration of the MCR [9]–[11]. An magnetostriction model considering the anisotropic magnetization properties based on backpropagation neural network is proposed in [22], [23] in which the vibration of a single-phase transformer is investigated. A numerical-based model for the static electromagnetic force is presented in [24] in which the correlation between the airgap length and the vertical displacement along with the influence of the Young’s modulus on the vibration of the airgap filler material is investigated. This article proposes a numerical model coupling with electromagnetic force and mechanical characteristics for MCRs considering the DC magnetic flux bias of the silicon steels. The MCR prototype is built and tested to prove the validity of the method proposed in this article
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