Advanced phase compensation control unit and method for double-CPU (central processing unit) intelligent wound-rotor motor

Abstract

The invention discloses advanced phase compensation control unit and method for a double-CPU (central processing unit) intelligent wound-rotor motor. The control unit comprises a master control CPU, a CPLD (complex programmable logic device) logic control circuit, a co-CPU (central co-processing unit), an input / output interface end, an analog / digital conversion circuit, an SIM (subscriber identity module) storage card interface, a storage circuit, a first crystal oscillator, a first reset chip, a second reset chip, a second crystal oscillator and an external device. The analog / digital conversion circuit receives a command from the master control CPU, converts real-time system operational alternating-current electrical signals into digital signals and transmits the digital signals to the master control CPU. The master control CPU acquires system operational electrical quantity and calculates electrical parameters and control algorithm. The co-CPU receives pulse signal calculation results output from the master control CPU and outputs trigger pulse signals. The CPLD logic control circuit receives the trigger pulse signals from the co-CPU, formats the signals and outputs the signals to a thyristor. The control unit and method allow for high-intelligence, high-stability, high-reliability, distributed and high-precision control of variable frequency and variable velocity controllers, and save production cost.

Description

technical field [0001] The invention relates to the technical field of a high-power winding motor phase advance compensation control system, in particular to a dual-CPU structure intelligent winding motor phase advance compensation controller and a control method. Background technique [0002] In the electric drive system, the asynchronous motor is the most widely used. From the design point of view of the asynchronous motor, when the asynchronous motor is running at the rated load, the power factor is generally 0.85. In actual work, the asynchronous motor is often not running at the rated power. In the electric drive system of asynchronous motor, the equipment compensation method is often used to improve the power factor of the motor and reduce the reactive power. [0003] For power factor compensation of high-power wound asynchronous motors, the following methods are often used: method 1, using parallel capacitors on the stator side of the asynchronous motor, method 2, us...

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Problems solved by technology

Method 1 can only compensate the reactive power on the grid line and the intermittent switching capacitor capacity, but cannot compensate continuously and has low reliability. Method 2 uses thyristors as the composition of the frequency conversion speed controller, which can realize The purpose of continuous reactive power control

[0004] At present, in the aspect of reactive power compensation of asynchronous motors in foreign countries, the control system structure commonly used is relatively complicated and the cost of the controller is relatively high.

However, in the research of motor frequency conversion controllers in my country, single-chip microcomputers are often used as the core control structure of motor frequency conversion controllers. This motor frequency conversion controller has low intelligence, low stability, and low reliability, and cannot realize distributed control.

[0005] In the control system with high current, due to the lack of intelligent protection of the motor frequency conversion controller, the phenomenon of burning components occurs after a fault occurs

In addition, due to the use of a single-chip microcomputer as the core control structure of the motor frequency conversion controller, it is difficult to control and coordinate the control algorithm and hardware logic output of the controller with a single CPU structure, and it is difficult to design a high-performance control algorithm, resulting in motor frequency conversion. The performance of the control system is poor, and it is impossible to achieve high-precision control needs

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