Study on the influence of conductor arrangement on the electromagnetic environment of DC transmission line constructed with AC transmission line in the same transmission line corridor

Abstract

With the rapid development of China's economy and the construction of UHV power grid, transmission line corridors are increasingly strained, in some areas, several UHV lines even share the corridor in parallel. Because the AC transmission line will affect the corona state and ion movement of the DC transmission line, and then, the ground electric field distribution of DC transmission lines is affected, the electromagnetic environment of AC and DC lines constructing in same corridor deserves special attention. For the feasibility of the project, this paper established a simulation model, studied the ion flow and ground electric field distribution of DC transmission line when it is arranged horizontally and vertically(constructing on the same tower) with AC transmission line. Then influence of AC line on the surface electric field intensity of DC line and the shielding effect of AC line on ion flow of DC line were analyzed, we obtained the reasons for the influence of AC wires on DC wires in two configurations, based on the influence on electromagnetic environment, the advantages and disadvantages of the two configurations are compared. Finally, a practical example of 330kV AC line and ±500kV DC line constructed in parallel and in the same tower is established, the feasibility of constructing AC and DC line on the same tower is proved.