Fuzzy control strategy-based asynchronous motor soft starter

Abstract

The invention discloses a fuzzy control strategy-based asynchronous motor soft starter. The soft starter comprises a central processing unit (CPU), a three-phase power supply, a power supply module, a keyboard module and a display module, wherein the three-phase power supply is connected with the CPU through a current detection module and an analog / digital (A / D) conversion module. The soft starter is characterized by also comprising a joint test action group (JTAG) simulation debugging module, a thyristor conduction angle measuring circuit and a thyristor driving voltage regulating circuit connected with the CPU, wherein the thyristor driving voltage regulating circuit is connected with a motor. The fuzzy control strategy-based asynchronous motor soft starter can simultaneously provide two start modes for a user to select, and in the two start modes, the thyristor trigger angle is calculated by adopting a fuzzy control table. Compared with the traditional thyristor soft starter, the fuzzy control strategy-based asynchronous motor soft starter has the advantages of strong interference resistance, high control speed, high robustness, strong adaptability and the like.

Description

technical field [0001] The patent of the present invention relates to a starting device of an asynchronous motor, in particular to a thyristor voltage regulating circuit adopting a fuzzy control strategy, and a soft starting device capable of enabling the motor to start smoothly. Background technique [0002] The asynchronous motor is a kind of counter electromotive force load, and the motor will form a large inrush current when starting, causing the voltage fluctuation of the grid. In order to realize the smooth start of asynchronous motors, in recent years, asynchronous motors have mainly adopted stepless adjustment soft start methods, including: liquid resistance soft start, magnetic control soft start, frequency conversion soft start and thyristor soft start, etc. Liquid resistance soft start is a soft start method that uses electrolytic solution to form resistance, which requires high ambient temperature and poor repeatability of soft start. The magnetic control soft s...

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Problems solved by technology

However, since the motor soft-start control system is a nonlinear, time-varying, multi-variable complex system, it is difficult to establish an accurate mathematical model for control, and the thyristor soft-start method also has poor anti-interference ability, slow control speed, and low robustness and other shortcomings

In addition, the thyristor soft-start method can provide two starting modes: current-limited start-up and ramp voltage start-up, among which current-limited start-up is suitable for light-load start-up and equipment whose starting torque increases with the increase of speed, and ramp-voltage start-up is suitable for heavy-duty However, the current soft starter using the thyristor soft start method usually only adopts one starting method, instead of providing two methods for users to choose at the same time, which makes the adaptability of the soft starter not strong.

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