Analysis of the relationship between DC component and spectral components of corona current on HVDC transmission lines

Abstract

Corona current is an important parameter to characterise the corona discharge on high‐voltage direct current (HVDC) transmission lines. The spectral components of corona current are closely related to a variety of corona effects, such as audible noise. It is of great significance to study the frequency‐domain characteristics of corona current. Here, the relationship between DC component and spectral components of corona current on HVDC transmission lines in the band of 2–20 kHz was analysed. First, a lot of corona current data were measured in two HVDC experiment bases. Then, the expression representing the correlation between DC component and spectral components of corona current within 2–20 kHz was established with the maximum surface nominal electric field intensity of conductor as an intermediate variable. Finally, the correctness and universality of the relationship found were verified. The research results here not only reveal the characteristics of corona discharge but can also provide a new way for obtaining the spectral components of corona current in 2–20 kHz with its DC component, and can lay the foundation to provide a new way to get audible noise indirectly based on the DC component of corona current in the future.

Corona current and audible noise characteristics of HVDC transmission lines and their relationship at high‐altitude

“…Ref. [15,16] used the ultra-high voltage (UHV) corona cage in Beijing to study the correlation between the AN spectrum, the equivalent A-weight sound level and the corona current spectrum. Ref.…”

Finite Element Method Assisted Audible Noise Detection for Overhead Line Conductors Using the Cage Experiment

“…As the distance between the cage wall and the wire is closer than the distance Energies 2023, 16, 4564 2 of 15 between the line and the ground, a lower voltage is applied to the wire, and the field strength of the wire surface can also reach the surface field strength level of the actual line at a higher voltage level, thus showing the corona characteristics of the transmission line at higher voltage levels. Cage experiments have been well proven to be an effective way to study the environmental impact of transmission lines [8][9][10][11]. Experimental studies of AN generated by corona discharge include both spectral test methods [12] and temporal test methods [13,14].…”

Effects of Conditional Changes on High-Voltage Direct Current Transmission Line Characteristic

“…e π model is suitable for analysis at low frequencies [29], whereas the universal line model is most appropriate for underground and submarine cables [33][34][35]. Other researchers used different methods for calculating the transmission line parameters [36][37][38][39][40][41][42][43][44][45][46][47] and the PSCAD/EMTDC program based on the CIGRE Benchmark to study the simulation models.…”