CN105450135A

CN105450135A - VF control method capable of automatically saving energy and flexibly lifting torque

Info

Publication number: CN105450135A
Application number: CN201410395774.9A
Authority: CN
Inventors: 王晓辉; 朱俊; 张锋; 孙旭熹
Original assignee: SHANGHAI HUAJIAN ELECTRICAL EQUIPMENT CO Ltd
Current assignee: SHANGHAI HUAJIAN ELECTRICAL EQUIPMENT CO Ltd
Priority date: 2014-08-13
Filing date: 2014-08-13
Publication date: 2016-03-30

Abstract

The invention discloses a VF control method capable of automatically saving energy and flexibly lifting the torque. During use of a frequency converter, the conventional VF control has the defect of shortage in the torque, lifting of the torque is set by manual operation, and the set of a lifting value is relatively difficult, when the lifting of the torque is overlarge, the motor performs overexcited operation, the output current of the frequency converter is increased, heat dissipation of the motor is increased, and the efficiency is reduced; and during non-load operation or light-load operation of the motor, the current of the motor exceeds the current that an actual load needs, and the efficiency is reduced. The VF control method can properly adjust the output voltage of the frequency converter through detection of the load current to achieve energy conservation; and during low-frequency operation of the motor, the lifting amount of the torque can be automatically adjusted according to a load, so that the torque of the motor matches the load, and the motor can stably operate. The VF control method can improve the VF operation characteristic of the frequency converter, reduce the difficulty of user debugging and the use of the frequency converter and timely deal with a load change of the motor, so that energy conservation and environmental protection can be achieved, and the practicality is high.

Description

A kind of automatic energy saving and promote flexibly the VF control method of torque

Technical field

A kind of automatic energy saving of the present invention and promote flexibly the VF control method of torque, integrate automated torque lifting, saving-energy operation control, motor oscillates suppression, realizes electrical machine energy-saving stable operation, belong to industrial control field.

Background technology

The variable frequency control of motor is that industrial control field is just in flourish direction, relative to the vector control method of advanced person, tradition VF controls to there is larger gap on torque response, energy-saving run, but vector control scheme cost is higher, it is larger that user accepts difficulty, therefore, the scheme that VF control method is a quick and low cost is improved.This scheme will reach the torque responsing speed close to vector control scheme, needs to detect load current in real time, adjusts output voltage in time, and this has higher requirement to VF control algolithm.

Summary of the invention

The present invention is poor in order to overcome traditional VF control method low-frequency torque characteristic, load response not in time, easily there is the shortcomings such as current oscillation when zero load or light running, design is a kind of integrates automated torque lifting, saving-energy operation control, motor oscillates suppression, realizes a kind of automatic energy saving of electrical machine energy-saving stable operation and the VF control method of lifting torque flexibly.Its technology is achieved in that the Software for Design comprising torque magnification functional module, energy-saving control function module, motor concussion suppression module; It is characterized in that: detect load current in real time, according to parameters such as running frequency, output voltage, motor stator resistance, through modules process, suitably adjust output voltage, reach electrical machine energy-saving and the object of stable operation.

Implement the advantage after this control VF method and effect is: overcome traditional VF control method low-frequency torque characteristic poor, load response not in time, easily there is the shortcomings such as current oscillation when zero load or light running, improve the VF operation characteristic of frequency converter, reach the object of more energy-conserving and environment-protective, hardware designs is not made to original frequency converter product and change, also do not need user to change frequency converter use habit, and reduce the difficulty of user's debugging and use frequency converter, have stronger practicality.

Accompanying drawing explanation

Fig. 1 is VF control method general structure schematic diagram of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the present invention is further described:

Its data processing and functional realiey process are:

(1) control module software realizes based on C language, and torque magnification functional module, according to the current operation frequency inputted, output voltage, load current and motor stator resistance parameter, draws the torque value that need promote through intelligent PI module;

(2) energy-saving control function module is according to energy-conservation instruction, draws Energy Saving Control voltage compensation value through Intelligent adjustment module;

(3) motor concussion suppression module detects motor operating state in real time, show that concussion suppresses voltage compensation value through Intelligent adjustment module;

(4) 3 compensating parameters, through integrated treatment, calculate the output voltage of adjustment in real time, thus realize electrical machine energy-saving operation stable again.

Claims

1. automatic energy saving and promote flexibly the VF control method of torque, comprises the Software for Design of torque magnification functional module, energy-saving control function module, motor concussion suppression module; It is characterized in that: detect load current in real time, according to parameters such as running frequency, output voltage, motor stator resistance, through modules process, suitably adjust output voltage, reach electrical machine energy-saving and the object of stable operation.

2. a kind of automatic energy saving according to claim 1 and promote flexibly the VF control method of torque, is characterized in that: described torque magnification functional module have employed intelligent PI adjuster, effectively improves VF low-frequency torque characteristic.

3. a kind of automatic energy saving according to claim 1 and promote flexibly the VF control method of torque, it is characterized in that: described energy-saving control function module have employed intelligent regulator, suitably adjustment output voltage realizes energy-conservation.

4. a kind of automatic energy saving according to claim 1 and promote flexibly the VF control method of torque, it is characterized in that: described motor concussion suppression module have employed intelligent regulator, suppress the current oscillation phenomenon that may occur when empty load of motor or underloading, motor is normally run.