Research On Control Method Of Boost PFC Converter With Constant Power Load

With the intensification of the energy crisis,the development and utilization of renewable energy has become the focus of attention of various countries.However,wind power,solar energy,biomass energy,geothermal energy,tidal energy and other renewable energy power generation resources are scattered,furthermore the power generation capacity and voltage levels are diverse,which has led to the widespread attention of renewable energy’s distributed DC power supply system.In this system,there are a large number of electrical energy conversion devices,most of which are composed of power electronic components.In order to solve this problem,a lot of solutions have been put forward by many scholars,but the control method to ensure the stable operation of PFC converter with constant power load is particularly complex.In this subject,the traditional boost converter is used as the rectifying topology,and a control method suitable for constant power load is constructed by the input-output linearization method to ensure the stable operation of the boost PFC converter with constant power load;Based on the engineering practice,it is found that the output voltage ripple of Boost PFC converter is proportional to the load,and then it is proposed that the load power change can be predicted by measuring the ripple change,and the stable operation of Boost PFC converter with constant power load can be realized by using the predicted load power brought in control method.The results of PSIM digital simulation show that the method has good dynamic and static characteristics,the input current can accurately track the input voltage,and the current waveform is smooth;when the load changes,the dynamic response is fast and the output is stable,which shows that the method has good robustness to the load.