Research On Delay Compensation Of Wireless Parallel Converter Based On Predictive Control Algorithm

The theory and application of predictive control has been developed rapidly in more than 20 years, and many achievements have been obtained in practical industrial control,which has become an important advanced control strategy. In the predictive control algorithm, the dynamic matrix control algorithm is based on the step response of the predictive control algorithm, which is suitable for the linear asymptotic stability of the system.Due to the power supply requirements of large capacity electronic equipment, the parallel power supply system has been developed rapidly. Because the parallel DC-DC converter using wired master-slave current sharing strategy, the connection cable between parallel converters will greatly reduce the maintenance of the power supply system, and the physical connection between the modules will bring many problems such as noise and interference. In order to overcome the disadvantages of the wired master-slave current sharing strategy, the wireless data transmission system and master-slave current sharing method are combined to construct wireless master slave current sharing method. Parallel DC-DC converter for wireless master-slave current sharing method, the wireless data transmission system replaces the physical connection line to carry out the current sharing information transfer between parallel modules. Wireless master-slave current sharing strategy though overcomes the disadvantages of physical connection line, however, due to the wireless transceiver to signal processing and wireless data transmission rate restrictions,making the signal transmission between the modules in parallel has some time delay.In order to solve the problem of wireless data transmission delay of wireless parallel DC-DC converter, this paper uses predictive control algorithm to compensate the data transmission delay of wireless parallel DC-DC converter. In order to achieve a better prediction effect, in this paper, the PID algorithm and DMC are combined to construct the PID-DMC prediction system. Specific research contents of this paper are as follows:(1) In view of the wireless data transmission delay of the wireless parallel DC-DC converter, the predictive control algorithm is adopted to compensate the delay of the data transmission.(2) On the basis of summarizing the characteristics of the existing predictive control algorithm, the PID algorithm and DMC are combined to construct the PID-DMC prediction system.(3) In order to carry out theoretical research, the PID-DMC predictive control algorithm function model is established under MATLAB, simulation of PID-DMC predictive control algorithm to compensate the wireless data transmission delay of wireless parallel BUCK circuit carried out.(4) In order to analyze the practical feasibility of the delay compensation of the PID-DMC prediction algorithm, on the experimental platform of the wireless doubleparallel BUCK circuit, PID-DMC predictive control algorithm to compensate the wireless parallel BUCK circuit data transmission delay of the experimental study is carried out.