Control method for high-voltage synchronous variable-frequency soft starting device of air blower in iron and steel plant
A technology of synchronous frequency conversion and control method, applied in the field of control, can solve the problems that synchronous motors cannot start by themselves, and achieve the effects of solving high installation costs, increasing torque, and increasing output power
Inactive Publication Date: 2020-01-24
BIG PAWER ELECTRICAL TECH XIANGYANG
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Therefore, when the rotating magnetic field rotates once, the average torque on the rotor is zero, so the synchronous motor cannot start by itself
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are the Some, but not all, embodiments are invented. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0018] The purpose of the embodiments of the present invention is to solve the problem of starting the synchronous motor and the problem of excessive current in the asynchronous starting method of the synchronous motor. By detecting the rotor position of the motor, the on-off of the inverter bridge is controlled to achieve smooth commutation and start the motor. Purpose.
[0019] F...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The embodiment of the invention provides a control method for a high-voltage synchronous variable-frequency soft starting device of an air blower in an iron and steel plant, comprising the following steps: after a system is powered on, EEPROM data is read, and the controller system is initialized; after a starting instruction of an instrument control DCS is received, a high-voltage synchronous variable-frequency soft starting device enters a starting process; and the initial rotor position of a motor is detected, and the conduction of an inverter bridge is controlled according to the initial rotor position. According to the embodiment of the invention, the rotor position of a synchronous motor can be accurately judged in the synchronous variable-frequency soft starting process of the synchronous motor, so that the technical problem of high installation cost of an existing mechanical position sensor is solved. Moreover, by adjusting the inversion lead angle, the output power of the inverter can be improved, and the torque of the synchronous motor during starting can be increased.
Description
technical field [0001] The invention relates to the technical field of control, and more specifically, relates to a control method for a high-voltage synchronous frequency conversion soft start device for a blower in a steel plant. Background technique [0002] Due to the advantages of adjustable power factor, high efficiency and stable operation, high-power synchronous motors are more and more widely used in the industrial field. At present, blast furnace blowers in large iron and steel plants are generally driven by high-power synchronous motors. The motor is in the cranking state at the beginning of the start-up, and the whole unit is driven by the cranking motor to rotate. The rotation frequency of the cranking motor is generally 0.5Hz. [0003] At present, in the process of synchronous variable frequency soft start of large synchronous motors, the traditional synchronous variable frequency soft start device needs a mechanical position sensor to control the opening state...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/20
CPCH02P6/20H02P2207/05
Inventor 梁业庭肖钧吴勇罗志贵苏国友刘小康
Owner BIG PAWER ELECTRICAL TECH XIANGYANG