engleski

Integral Equation Methods for Ion Flow Field

The high voltage power transmission lines corridors are spatially limited in densely populated areas. Problems for power system operators are both constraints in a space and lack of public acceptance to new high voltage facilities. A way to respond to growing energy demands is to integrate high-voltage direct current (HVDC) transmission lines in existing power system. HVDC in electric power systems is economic in long distance power transfer. HVDC lines are also effective as interconnections of independent power systems. When embedded to AC system, HVDC power transmission enhance control over the electric grid, with important features, such as voltage control, low- frequency power oscillation dumping, power flow control and transient stability improvement. Electric field of HVDC needs to be carefully evaluated in order to address insulation coordination. Additionally, there is a need for computation of electric field strength near the HVDC line corridors on the ground level due to legislation and public concerns regarding possible negative effects of electromagnetic fields on humans and environment. Electric field in a space around HVDC transmission line is induced due to the charged conductors and ion density in space. The ion current density is determined by the product of ion density and electric field, so the calculations of electric field in space and ion flow field are coupled and nonlinear. In this paper the ion flow field will be computed with high order integral equation methods. Results of the computation will be presented near the sources and on the ground level. Since the problem is nonlinear it will be solved iteratively in time domain. Results will be benchmarked with measurements on the ground level.

HDVC, ion flow field, integral equations

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