The Study Of Asynchronous Motor Speed Regulationg System Based On Three-Level

The asynchronous motor is for its simple construction, ruggedness and otherexcellences. With the development of new power electronic component and computertechnology, high performance variable-speed system for induction motor has beenapplied extensively. Because of the less harmonic wave and translating sine waveeasily,three-levelinvertercanbeusedinmoreandmorefiled.Firstly,inthispaper,theasynchronousmotorandspeedregulatingprinciplewereintroduced. Then illuminated the principle of vector–control of AC motor thattorque-control of AC motor is transformed into the DC motor in order to control theAC motor. The speed-sensorless vector control system controlled based on variableparameterMRASandspeeddisparity-torquecontrolsystemwasalsobeexplained.The paper primarily studied the SVPWM arithmetic, as well as ameliorating thismethod. Optimized arithmetic that space-vector diagram of three-level invertertransform into that of two-level inverter is discussed and analyzed,as well as how tocontrol the neutral-point potential availably. That also provides an easier calculatemethod and avoids the infection of midpoint voltage unbalance. Computing processwas expatiated. This arithmetic was used in the control systems mentioned above byusingMATLAB,asalsocomparingtheresult,validatingtheimprovedarithmetic.What is more, numerical control design of the asynchronous motor based onthree-levelinverterbyusingtheTMS320LF2407DSPwasalsostudiedinthispaper.Keywords: asynchronous motor AC-speed regulating Vector–controls three-levelSVPWM...