A compensation system and compensation method of the inverter dead area used in vector control

Abstract

The invention discloses an inverter dead-time compensation system applied to vector control. The system comprises an induction motor, a dead-time calculation compensation module, a vector control module and an inverter, wherein the induction motor is connected with the inverter, the signal output end of the vector control module is connected with the inverter, the dead-time calculation compensation module is connected with the output voltage of the vector control module, and the compensated output voltage is connected with the inverter and compensates the inverter. The system has the advantages that the problems in the present dead-time compensation method are solved, the workload of workers is reduced, and the motor is preheated before operation, so that the performance of the motor is promoted after dead-time compensation.

Description

technical field [0001] The invention relates to the field of asynchronous motors, in particular to an inverter dead zone compensation system and compensation method applied to vector control. Background technique [0002] Sensorless vector control technology has been widely used in asynchronous motor drive systems, and its control accuracy mainly depends on the accuracy of flux linkage estimation. In a variety of vector control algorithms, the estimation of flux linkage directly or indirectly depends on the integration of induced electromotive force, and the induced electromotive force depends on the accuracy of stator voltage measurement. Considering the cost and accuracy, the vector pulse width modulation module is used The output voltage replaces the stator voltage. [0003] The dead zone effect of the space vector pulse width modulation voltage source inverter at low frequency and light load leads to problems such as motor phase voltage and phase current distortion, zer...

AI Technical Summary

Problems solved by technology

The feedback method requires the use of an optocoupler to capture the pulse width signal, and the pulse width can be obtained by using the DSP pulse width capture unit. In this way, the voltage is shaped into a standard square wave, and there are reasons such as lag in DSP detection and A / D conversion accuracy. Accuracy is difficult to improve

The feedforward method is based on the square wave and trapezoidal wave models, the former is easy to cause current clamping, and the latter needs to calculate the current phase angle

In addition, there are manual detection methods, which have a huge workload and are not suitable for large-scale

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