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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...
Transient processes are generated by operations of disconnect switches and circuit breakers in the AC side of converter stations. Several trips in different plusmn500-kV HVDC converter stations in china happened recently. Characteristics of transient Electromagnetic Interference due to switching operations are summarized based on onsite tests in a practical converter station. Measurements are performed...
When dc current is injected into the earth through the grounding electrodes of an HVDC system, transformers in an ac system may be under dc bias if the dc currents flowing through the transformers are large enough. In this paper, a circuit model is presented to calculate the dc current distribution in an ac power system caused by the ground return current of a dc system. A complex image method is...
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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