Abstract: With the increasing of the public’s attention on the electromagnetic environment, it is necessary to predict and evaluate precisely the level of the electromagnetic environment at the design stage for high voltage direct current (HVDC) converter station. Different 3D simulation models of 1 000 kV AC side region are established according to the design scheme of the AC side converter area of ±1 100 kV Guquan converter station. By using the finite element analysis software, the power frequency electric field at the patrol channel around the AC filter field is analyzed on the basis of the different models. In addition, the influence of the height and the phase spacing of the bus-bar are also analyzed. The calculation results show that the capacitor bank in the AC filter area contributes relatively little to the power frequency electric field at the patrol channel around the AC filter area, but the tube above the patrol channel contributes relatively large. Therefore, the model of the capacitor tower can be simplified to reduce the calculation consumption. Based on the simplified simulation model, it is found that the power frequency electric field on the patrol channel decreases with the increase of the height of the bus-bar, and it also decreases with the decrease of the phase spacing. For the Changji converter station, the maximum value of the power frequency field on the inspection channel in the 1 000 kV AC area is 11.8 kV/m when the height of the bus-bar is 16.5 m and the spacing distance is 14.2 m. This value satisfies the requirements of engineering design. In order to verify the accuracy of the calculation method, the same method is used to simulate the power frequency electric field in the 500 kV AC field of Tongli converter station, and the simulation results agree well with the test results.

Key words: AC filters, electromagnetic environment, power frequency electric field, busbar height, HVDC