Input filter resonance mitigation scheme for matrix rectifier

In order to mitigate input filters resonance,a simplified low-cost control method,combined the advantages of one-cycle control strategy and active damping technique,was developed for three-phase AC-DC matrix converter,or matrix rectifier. Parameter estimate method was used to remove unnecessary sensors. A model including the active damping method and input filter was established with considering delay caused by actual controller. Aiming to guide the tuning up of the virtual resistor,the stability of this model was analyzed using zero-pole map. By combining with one-cycle control strategy,the algorithm complexity of the proposed active damping method was reduced,resulting in easy engineering implementation. At last,experimental researches were conducted on a prototype matrix rectifier. The results show that the magnitude of the harmonics near the resonance frequency is reduced from more than 10% to below 2. 5%. Accordingly,the Total Harmonic Distortion( THD) of grid-side input currents is decreased from 18. 75% to 2. 5%. Hence,the correctness of the theoretical analysis,and the feasibility of the proposed control method are validated.