Research On Midpoint Voltage Control And Its Speed Governing System Based On NPC/H Bridge Five-level Inverter

In the modern society,the exchange of frequency control technology in the rapid development of micro-processing and electronic technology has made some achievements,however,AC inverter system in the application is limited to a lot of high-pressure conditions,including some compression and Resistance level.In some industries and mining continue to evolve for the ever-increasing demand for such belt-driven motors and low harmonics,a wide range of inverter levels are being developed and used in many high-power areas such as conveyor belts,lifting Machine,compressor and so on.In this article creatively presented the inverter NPC/H such bridge five-level by using SVPWM and SPWM we studied a special calculation method for the study of time,and mastered the mid-point voltage in a variety of Various combinations of switches present different displays,and for the combination of charging and discharging have a logical understanding of the voltage imbalance for the existing problems of the V/F closed-loop based on the various mechanisms of SPWM and SVPWM,It is important that we maintain the voltage stability under all conditions.In the last part of the article,the use of simulation technology to achieve the test of the various ideas we have put forward has achieved good results.Proved the authenticity of the experiment.We use PLECS to achieve the vector simulation of control,the results obtained show that the system has a good response and stable state,STM32F407+CPLD is the center of our experiment is used to control a variety of design,at the same time in the load and empty In various studies,we found that our experimental results have good performance embodied in the two aspects of movement,to achieve the value of the experiment.