Design On Hybrid Power Filter For The Traction Supply System

China's large-scale using of electrified railway makes it a key problem that the harmonic content of the electrified railway load is particularly high. Nowadays, 3-orders single tunable filters are used in most traction substations in our country, and the method of filtering effect is far from meeting the requirements. APF will be able to overcome the power of passive filter, as a result, by filtering properties of the system parameters, such as the possible shortcomings of the harmonic amplification effectively harmonic suppression. However, due to the higher costs of the active power filter, the hybrid power filter will be a better program which combined the active power filter and the passive power filter to management harmonic pollution of the electrified railway.The article discussed the traction substation hybrid power filter to install at the best location, the structure, the APF passive power filter in the series after the parallel bus on a fixed pose a harmonic filter for slip compensation program was discussed in an attempt to passive and active power filter as a power filter. The hardware and software of the series-parallel hybrid power filter are designed. The main equipment is given based on a minimum investment of hybrid power filter optimization models and algorithms, on-site use of the measured data of the Jin Zhou traction substation, design a hybrid power filter of the main parameters. The APF inverter structure, the type of PWM control is discussed. The design of the parameters of the APF output filter is discussed, optimizer is prepared, the results of the design are given.The active power filter control system is designed. For the APF principal studies have focused on the command controller, this article also discusses the detailed instructions tracking controller design.The DSP chips TMS320LF2407A is used for the core control chip, including the designe of the external interface of the circuit, sampling circuit, PWM output circuit design, and the Matlab / Simulink is used in the power system module structure of the single-phase device and the circuit simulation. In this paper, and carried out the theoretical analysis bythe results of the simulation. The simulation results show that the plan has a very good filtering effect, and the control system has a faster response time.