Using special APF to improve harmonic rate of MRT power system

Most APFs use improved designs of active power filters of half-bridge and full-bridge circuits, their advantages and disadvantages are compared. International journals often use this filter circuit for small circuit boards. For large power systems, nonlinear loads still need to overcome harmonic pollution and magnetic pollution. Its disadvantage is that it will reduce the power of the system and requires power compensation. For nonlinear load harmonic filtering, RLC high-pass filter is not the best filtering method. Due to high-power rail high-voltage systems (22 KV–161 KV), the industry has not yet applied APF to remove harmonics. Previous research on nonlinear load harmonic filters for high-voltage systems was only 6.9 KV. Later, with the development of industry and the increase in electricity consumption, the high-voltage system increased to 22 KV–161 KV. Experimental data on high-voltage power systems are difficult to obtain. This study verified the feasibility of this method through simulation. Therefore, this study proposes to use a combination of two single-phase high-pass filters form a three-phase APF to filter nonlinear load harmonics in the track’s large power system and effectively increase the capacity of the large power load. APF filters harmonics through three phases to prevent train signal abnormalities and extend the service life of trains. Since the centralized power supply system must be used in conjunction with other loads, harmonic pollution will occur. Electric vehicles accept this kind of pollution source, which is detrimental to on-board equipment and on-board signals. In power electronics theory, the spirit of this article is to use APF to filter out harmonics of the power system through three-phase technology in the range of 22 KV–161 KV. This has not yet been done in the industry. I put forward this theory, which is also the meaning of this job.