Research On Load Distribution Of Parallel DC Power Supplies Based On Efficiency Optimization Technology

To meet the growing demand for large capacity of power system, more and more focus have been put on the parallel DC power system. The paralled power system has a lot of advantages, such as high reliability, low cost,high power density. In the study of parallel DC power system, the control strategy of load distribution is a major research topic, the traditional load distribution method is current sharing control strategy, but this method does not take the overall efficiency of the system into account. To improve the overall efficiency, a novel load distribution which is based on optimizing the efficiency is proposed .In order to verify the proposed novel load distribution control strategy, Firstly, the control strategy of signal DC power has been reasearched, a simulation model of the DC power supply is built, the simulation results verify the design of the control strategy. On the basis of signal power supply, the study of parallel DC power system is carried out, in order to provide compared reference, the maximum current automatic current-sharing control strategy is designed, the simulation analyses verify the design can achieve current sharing in different conditions, and have a good dynamic response and stabilizing performance. By the analysis of the loss of the DC power circuit, the factors of the efficiency of the power supply are discussed, the differences between the DC power supply circuit parameters and the circuit parasitic parameters all can effect the efficiency, the efficiency of the signal power supply can be approximated expressed with the output current. A load distribution control strategy aimed at improving the overall efficiency of the system is designed, furthermore, the control strategy and the implement method are illustrated. Using the genetic algorithm to achieve the overall efficiency optimization calculation, in the simulation environment, compare the two load distribution control strategies, current sharing control method and efficiency optimization control strategy. The simulation results verify the new load distribution control strategy can enhance the overall efficiency of the parallel power system. Finally, based on the completion of hardware and software design, build the DSP-bssed experimental platform. The experimental data analysis can prove that the novel load distribution strategy can enhance the overall efficiency of the system compared with the current sharing control strategy.