Power Filter Constant Frequency Hysteresis Current Control System with Flexible Margin Constraints
When controlling the fixed frequency hysteresis current of power filters,the harmonic filtering effect of the filter is re-duced due to the influence of switching frequency.Therefore,a fixed frequency hysteresis current control system of power filters is de-signed under flexible margin constraints.This method first completes the detailed functional design of each hardware module within the framework based on the constructed control system framework;Then,based on the master and slave DSP modules in the system,obtain the principle of filter fixed frequency hysteresis current control and develop a power filter fixed frequency hysteresis current con-trol strategy;Finally,a system control constraint condition is established with flexibility margin as the constraint,and the results are obtained through the constraint conditions to select an internal and external loop control strategy that is suitable for the error current,thereby achieving current control of the fixed frequency hysteresis loop of the power filter.The experimental results indicate that when using this method to implement frequency-locked loop current control for power filters,the harmonic amplitude is below 10-2A.The maximum switch frequency of the filter is 72 times per second.The control effect of the output current shows a high degree of fitting with the reference current,indicating that this method has a good control effect.
flexibility marginpower filterfixed frequency hysteresis currentcontrol strategyswitching frequency
万方数据
维普
