Researches On Control System In400Hz Single-phase Inverter Power

With the rapid development of science and industrial technology, inverter power hasbeen widely used in civil and military fields such as electricity, communication andspaceflight.400Hz medium frequency inverter power belongs to the category of thespecial power supply, they are usually used in aerospace, vessel, radar, oil and metallurgy.In order to get the stable, safe, reliable and robust output, this dissertation focuses on thedesign of the control system of the single-phase400Hz inverter power.Initially the research background and the development of inverter power isintroduced and the control strategies of inverter power are summarized. In addition, theoperating principle and the main circuit topologies of the inverter power are introduced.Subsequently the mathematical model of inverter power is established. Eventually, the fullbridge inverter circuit is selected in this paper. The principle of single-phase DQ transformis emphatically introduced in this article, subsequently the principle of the lag signal andDQ transform is analyzed in detail. In addition, the simulation plat is constructed inMATLAB/simulink, then the control system is simulated, the simulation results of normaloperation and sudden load are given, the results of the control system are all presented.The double closed loop control system based on lead signal and DQ transform isinnovatively presented, the difference between the two methods is that the virtual phase isahead of the actually signal. The corresponding simulation is constructed inMATLAB/simulink, then the control system is simulated. Lastly, the experiment plat ofsingle-phase400Hz inverter based on TMS320F28335DSP digital control design isestablished, the control system of the lead signal and DQ transform is tested, thesimulation results and the experiment results all verified this control system can meet theoutput waveform of the demands. However, these two solutions exist the secondarysubsidence problems at the time of sudden add load voltage, which is not allowed in theprocess of industrial production.In consideration of the deficiency of the proposed methods above, a double closeloop PI control scheme based on the Hilbert transform and the DQ transform is proposedin this article. Firstly, the control principle based on this scheme is introduced, then thesimulation results are demonstrated, the results are compared with the two methods in thefront, the results verified that the double close loop PI control based on Hilbert transform and DQ transform can avoid the secondary subsidence problems. Besides, the harmonicdistortion rate of the output voltage is lower than the methods in the third chapter, fromthis, the superiority of this method is verified.