A Full-Order Observer Velocity Sensorless Control System Based on Error Weighting

Abstract

The invention discloses a full-order-observer speed-sensor-less control system based on weighted errors. The full-order-observer speed-sensor-less control system comprises a SVPWM, an inverter, IM, two Clark modules, two Park modules, a reverse Park module, a full-order observer, a first comparator, a second comparator, a third comparator, a first regulator, a second regulator, a third regulator and a slip calculating module; voltage values output by the inverter are collected and converted, then the u<alpha> and the u<beta> in a two-phase static coordinate system are obtained, and then the voltage values are converted by the Park modules into the u<d> and the u<q> in a synchronous rotating coordinate system; IM three-phase currents are collected, are converted by the Clark modules into the i<s alpha> and the i<s beta> in the two-phase static coordinate system and then are converted by the Park modules into the i<sd> and the i<sq> in the synchronous rotating coordinate system; the current i<s alpha> and i<s beta> and the voltage u<alpha> and u<beta> are input through the full-order observer to obtain the estimated electric angle speed; then a series of comparing and regulating operations are carried out, the input voltage is subjected to space vector pulse width modulation through the SVPWM module, PWM waves are output to the inverter module, and the inverter drives the IM. Thefull-order-observer speed-sensor-less control system based on the weighted errors has the advantages that the problem that a traditional speed-sensor-less driving system is instable in low speed is solved, and meanwhile the low-speed running performance of the system is improved.

Description

technical field [0001] The invention relates to the field of asynchronous motor control, in particular to a speed sensorless control strategy based on a full-order observer. Background technique [0002] Vector control is the mainstream control scheme of induction motor (IM), and the speed information is the premise of implementing the vector control algorithm. Although the installation of mechanical sensors such as photoelectric encoders and resolvers can more accurately detect the speed signal. However, on the one hand, in places with strong vibrations such as electric vehicles and wind power generation, it is difficult to guarantee the effective service life of the sensor, which reduces the reliability of the system operation; on the other hand, the mechanical sensor and its detection circuit also increase the cost of the variable current drive system. and hardware installation complexity. [0003] The full-order adaptive observer algorithm has been widely used in resea...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the low-speed instability problem of the traditional speed sensorless drive system, and at the same time improve the performance of the system at low speed

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