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In HVDC systems, power converters are well known the generators of harmonics on both ac and dc side. Because of the interaction between ac and dc systems, some kinds of disturbances in the ac or dc side may cause the fundamental or second harmonic current on the dc side. When the dc loop of the HVDC system has natural resonant frequencies on the fundamental or the second harmonic frequencies, the...
In HVDC converter station, the characteristics of steady electromagnetic environment is related to the working state of converter valve's AC-DC conversion process. Every fast firing and breaking process of the converter valve leads to an electromagnetic transient process, as well as a electromagnetic field with high frequency and wide spectrum. This paper analyses the working process of 12-pulse-converter,...
Converter valve will produce transient electromagnetic process when it cut off rapidly every time, then it will radiate high frequency Electromagnetic field. This article research radiate of 12 impulse valve, I use computer simulation technology and model experiment, Compare two groups' data.
The wide-band frequency electro-magnetic (EM) noise is generated during turn-on and turn-off processes of thyristor valves in converter stations. It will be conducted along the primary circuitry, and may interfere with secondary systems by the way of conducted and radiated coupling. The plusmn800-kV UHVDC transmission project is one of newly developed technique and used barely in the world. The electro-magnetic...
In this paper, we analyzed the electromagnetic disturbance of plusmn 500 kV valve tower by electromagnetic field calculating software, which based on the instantaneous method, but also including the space electromagnetic field and the radio interference level. And then, we compare the radiated electric field strength with the relevant standards, its comparison with observed result is being studied...
The wide-band frequency EM noise is generated during the processes of firing and turn-off of thyristor valves in converter stations. It will be conducted along the primary circuitry, and may interfere with secondary systems by the way of conducted and radiated coupling. The plusmn800-kV UHVDC transmission project is one of newly developed technique and used barely in the world. The EMI problem is...
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