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This paper focuses on the stray capacitance of HVDC key devices and its impact on the harmonic distribution and the problem of obtaining wide band models for electrical power system transient simulation purposes for EMTP with linear components. Smoothing reactor, converter transformer and the valve hall can be modeled with stray parameters by segmented wide-band model with skin effect resistance....
In this paper, the ±1100 kV HVDC system impedance model is analyzed under various disturbances. For various disturbances caused by induced current from AC line in the same route, by AC faults and by converter faults, the positions of voltage simulating sources in the DC loop for impedance analysis are different. Taking the 2688 km ±1100 kV DC power transmission project from Zhundong to Chongqing for...
HVDC transmission system operating in ground return mode often affects the neighboring ac power system seriously. This paper presented some field experimental results, including audible noise, voltage harmonics, and oscillation of the transformer while dc current passes through the neutral point. The relationship between the dc neutral current and those effects were discovered clearly by analyzing...
In this paper, an upwind finite element (FE) based algorithm devoted for the computation on the ion flow field of bipolar high voltage direct current (HVDC) transmission lines. The choice of initial charge density value on conductor surface is discussed to satisfy the requirement of bundle conductor computation. Non-reflective boundary condition is introduced to improve the computational efficiency...
A numerical method to calculate the ion flow field in the vicinity of multi-circuit DC transmission lines is described. Details of the transmission lines such as bundle conductors and ground wires are taken into account in this simulation model. Deutsch assumption, a commonly used simplification in traditional numerical methods is eliminated. The ion flow field of a ??500 kV HVDC project with bipolar...
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