Research On Sensorless Vector Control System Of Induction Motor For High-Power Cell-Cascaded Inverter

High-voltage motors with frequency control can be saving nearly 40% of the high-voltage inverter is widely used in electric power, water supply, metallurgy, petroleum, chemical, mining, coal, paper, building materials and other fields.High-voltage motor is connected in series through the power unit and level SPWM modulation topology to achieve, in tandem high-voltage inverter speed sensorless vector control, the speed of identification, observed flux and electrical parameters on self-test is to improve high frequency performance the key indicators. Commonly used voltage and current flux observation model, the rotor winding parameters with temperature and skin effect with frequency change, the rotor resistance may vary greatly, so they give the rotor flux observation difficult. Model reference adaptive method of pure points, because there are zero drift, low speed error increases as the actual estimates of the effect may affect the dynamic performance is not good. For these reasons a serious impact on high frequency performance.Depth analysis of the text in the theory and technology of high-voltage frequency and current development trends, existing high-voltage inverter for the existence of flux observation and integration drift problem, a compensation voltage model flux limited methods of observation and first-order low-pass and closed-loop form high-pass circuit speed adaptive identification model to replace the pure integrator adaptive model of the program, the observed flux and the rotor speed estimation, proved receive good results.In practice, application of TI's DSP TMS320LF2812 algorithm computing and FPGA of ALTERA Company CYCLONEII series do hair spread power cabinets, etc., in a 5kW induction motors on experimental research, practice proved the correctness and feasibility.