Abstract
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.
Highlights
HVDC technology has been developed in recent years, by converting the AC power into DC power at the sending end, and transmitting to the receiving end, where the DC power is inverted into AC power to feed back to the AC system [1,2,3,4,5]
The simulation vibration acceleration of anode saturated reactor (ASR) core under different magnetic flux density is shown in the Figure. 11(a), and measured vibration acceleration of iron core under different magnetic flux density is shown in the Figure.11(b)
Different from the Figure.13(a), the spectrum contains the frequency components 100Hz and a lot of its multiplications with the magnetic flux density is 1.8T, as shown in Figure.13 (b). The reason why this phenomenon occurs is that when the magnetic flux density becomes saturated, magnetostriction is nonlinear with the magnetic field[35]
Summary
HVDC technology has been developed in recent years, by converting the AC power into DC power at the sending end, and transmitting to the receiving end, where the DC power is inverted into AC power to feed back to the AC system [1,2,3,4,5]. The anode saturated reactor (ASR) is the key component in the HVDC system. The harmonics current will aggravate the core vibration of the ASR [7]. The core vibration will in one hand cause the large noise, which destroys the working environment, and in another hand accelerate the device aging, reduce service life of the device, and even reduce the working life of the converter valve system [8]
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