Vibration of saturable reactor core used in HVDC converter valve system

Zhang, Pengning; Li, Lin

doi:10.1049/joe.2017.0842

Cited by 9 publications

(4 citation statements)

References 15 publications

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“…Including hysteresis loss, eddy current loss, and additional loss, the core loss is mainly caused by the sharp change in the voltage and current of the saturable reactor at the moment the valve switches on and off. According to Bertotti's iron core loss calculation theory, the calculation equation for the total iron core losses per unit weight of silicon steel sheet under any magnetic flux density waveform is [15][16][17][18][19] The core loss coefficient can be obtained through finite element simulation by applying the least square method to fit the measured loss curve [20]. The paper deepens theoretical research through equation derivation.…”

Section: Calculation Of Saturable Reactor Lossesmentioning

confidence: 99%

“…FreeConvection reactor reactor air P hA T T = (15) Where: h is the convective heat transfer coefficient; 4) Heat radiation of the reactor case According to the Stephen-Boltzmann law of thermodynamics, the thermal radiation power of the saturable reactor case is determined by the surface area of the reactor, the surface radiation coefficient, and the temperature difference between the surface of the reactor and the surrounding air. According to equation ( 16), the calculated thermal radiation power of the reactor is 72W.…”

Section: ( -)mentioning

confidence: 99%

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Research on Losses and Heat Dissipation of Saturable Reactor Used in Converter Valve

Liu¹,

Li²,

Chang³

et al. 2022

IEEE Access

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Based on the analysis of the principle and structure of a saturable reactor used in a converter valve of HVDC transmission, this paper analyzes its power loss composition and summarizes and derives the power loss equations. According to finite element analysis, the saturable reactor is modeled, its transient electromagnetic characteristics are simulated, and the core loss density distribution is studied. The influence of the cooling circuit and air on the heat dissipation of the saturable reactor is studied. The power loss density obtained by the electromagnetic field finite element analysis is mapped as the heat source to the finite fluid element for thermal simulation in order to obtain the spatial temperature distribution of the saturable reactor. The maximum temperature of the case is about 68.5℃, while the maximum temperature of the iron core is about 87.9℃. The converter valve operation test validates the accuracy of the heat dissipation analysis and temperature field simulation. The research results can serve as a reference for the design of saturable reactors used in converter valves.

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Section: Calculation Of Saturable Reactor Lossesmentioning

confidence: 99%

Section: ( -)mentioning

confidence: 99%

Research on Losses and Heat Dissipation of Saturable Reactor Used in Converter Valve

Liu¹,

Li²,

Chang³

et al. 2022

IEEE Access

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“…Magnetic shielding is assumed to be present at the box‐shaped boundary of the transformer. The analysis is performed implementing the interface of the magnetic fields of the COMSOL multiphysics software, which computes the electromagnetic field by using Maxwell's theory as given in (3), (4) and (5), 28

J^{e} = γ \frac{∂A}{\partial t} + \nabla \times ((), α_{0}^{- 1} . α_{r}^{- 1} \nabla \times normalA),

normalB = α_{0} α_{r} normalH = \nabla \times normalA,

boldJ = γ boldE + J^{e},

where J is the current density, J e is the winding current density, A is the magnetic vector potential [ A x A y A z ], α 0 represents the permeability of free space, α r is the relative permeability of the material, γ represents the electrical conductivity and E is the electric field. The above equations are solved by setting up the magnetic vector potential A and a convergence constraint ψ .…”

Section: Fem‐based Analysis Of Vibration and Acoustic Noisementioning

confidence: 99%

Investigation on magnetostrictive behaviour of a converter transformer influenced by dominant harmonics: AFEMandANNbased approach

Yadav

Mehta

2021

Int Trans Electr Energ Syst

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Summary The introduction of harmonics to the HVDC system is imminent, which affects the components of the power system from varied perspectives. The present work emphasises analysing the behaviour of the converter transformer concerning the harmonics in the input. The process involves designing a stepped configuration of a 240‐MVA converter transformer using the finite element method (FEM). The designed model is analysed as per its structural dynamics to obtain its vibrational response for different ranges over the frequency spectrum. Furthermore, the module of acoustics and thermal analysis is coupled to the vibrational model. The coupled model serves as an efficient tool in analysing the impact of different orders of harmonics on the vibrational, acoustic and thermal performance of the core of the converter transformer. The computational effort taken in solving the coupled field problem is simplified by designing a neural network model and the prediction efficacy of the network is enhanced by using a Hybrid of Particle Swarm Optimisation and Gravitational Search Algorithm (HPSOGWO) as tuner of the internal parameters of the neural network. The significance of the designed model is also examined against other well‐versed hybrid algorithms in the literature in terms of various statistical indices.

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“…The magnetostriction of the ultrathin silicon steel sheet is nonlinear with the magnetic field [28]. The anisotropy, applied stress, and temperature will have a great influence on the magnetostriction of silicon steel sheet [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Study for Influence of Harmonic Magnetic Fields on Vibration Properties of Core of Anode Saturable Reactor in HVDC Converter Valve System

Wang

Gao

et al. 2021

IEEE Access

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The cores of anode saturated reactor (ASR) are the main vibration source of the HVDC converter valve system. The ASR is excited with an impulse voltage, which contains many harmonic components, and the magnetostriction of cores is usually the main reason of the ASR vibration. Therefore it is significant to study the influence of the harmonic on the vibration of core of ASR. In this paper, the magneto-mechanical coupling model is established based on the magnetostriction theory and the expression of vibration acceleration in the presence of third harmonic is derived. The vibration test platform is built to test the core's vibration acceleration. The magnetic and magnetostrictive properties of silicon steel sheet under different working conditions are measured. The three-dimensional simulation model of the core is established, and the vibration acceleration under different magnetic flux density is calculated. The comparison of the experiment and simulation results shows the rationality of the magneto-mechanical coupling model. The influence of third harmonic magnetic flux density on vibration is studied by changing the phase of the third harmonic magnetic flux density and the ratio of the third harmonic magnetic flux density to the fundamental magnetic flux density. Both the calculated and measured results show that the third harmonic magnetic flux density affects the vibration acceleration according to the double-frequency components of the third harmonic, as well the sum-frequency and difference-frequency components of the third harmonic and fundamental frequency.

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Vibration of saturable reactor core used in HVDC converter valve system

Cited by 9 publications

References 15 publications

Research on Losses and Heat Dissipation of Saturable Reactor Used in Converter Valve

Research on Losses and Heat Dissipation of Saturable Reactor Used in Converter Valve

Investigation on magnetostrictive behaviour of a converter transformer influenced by dominant harmonics: AFEMandANNbased approach

Study for Influence of Harmonic Magnetic Fields on Vibration Properties of Core of Anode Saturable Reactor in HVDC Converter Valve System

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