A Digital Control Strategy of PFC in Aero Variable Frequency AC System
摘要
With the development of wide variable frequency AC power supply system, the PFC(Power Factor Correction) function of aero equipment is more difficult for realization in the digital control system, especially harmonic disturbance included in the input voltage. A digital control strategy is proposed, with the application of the variable sampling/switching frequency. In this scheme, the sampling/switching frequency is set as a fixed proportion to the input voltage frequency in order to adapt the frequency variety. In addition, a repetitive controller for harmonic suppression is introduced, which can significantly improve the performance of the current control. Simulation results in Matlab validate the effectiveness of the proposed strategy.