Frequency converter S-curve acceleration/deceleration sudden change control method

Abstract

The invention discloses a frequency converter S-curve acceleration / deceleration sudden change control method. The method includes the following steps that: current frequency signals are acquired, first deviation signals are calculated, so that whether sudden change occurs on a frequency converter in an acceleration / deceleration process can be judged; second deviation signals are calculated, and the first fuzzy vector of a fuzzy controller is obtained; a deviation change rate is calculated, and the second fuzzy vector of the fuzzy controller is obtained; the fuzzy control quantity of the fuzzy controller is obtained, and the exact quantity of S-curve acceleration / deceleration circular curve time is obtained; and real-time output information is calculated by means of an S-curve acceleration / deceleration algorithm. With the method of the invention adopted, given rotation speed at an output rotation speed real-time tracking sudden change time point can be ensured when an intelligent fuzzy control method gives sudden change in an S-curve acceleration / deceleration process, and the stability of a system can be improved.

Description

technical field [0001] The invention relates to the technical field of intelligent control of frequency converters, in particular to a control method for sudden changes in acceleration and deceleration of S-curves of frequency converters. Background technique [0002] Inverter is a power control device that uses frequency conversion technology and microelectronics technology to control AC motors by changing the frequency of the motor's operating power supply. In the motor drive system, precise real-time control of acceleration and deceleration is the development requirement of high-performance frequency converters. At the same time, acceleration and deceleration control is a key technology in the fields of motor drives such as robots, high-performance numerical control systems, and electric vehicles. The currently proposed acceleration and deceleration control technologies mainly include linear acceleration and deceleration, exponential acceleration and deceleration, trigon...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that, for the S-curve acceleration and deceleration processing algorithms in the above-mentioned prior art, there are mainly nested forward-looking fast algorithms, real-time interpolation cycle calculations, multivariate nonlinear equations, etc., and its speed planning and solution algorithm equations It is cumbersome, and its effect on suppressing disturbance and nonlinearity is poor. It is difficult to establish a model when there is a large amount of nonlinearity, and it is difficult to use classical control methods to meet the control requirements. A control method for the sudden change of acceleration and deceleration of the S-curve of the inverter is provided.

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