Control method and control device of power supply soft launch for intermittent power supply by balance beam type pumping unit

A beam pumping unit, intermittent power supply technology, applied in excitation or armature current control, program control in sequence/logic controller, electrical program control, etc. The problem of reducing the service life of its transmission system can achieve the effect of fast and soft input, avoiding inrush current and mechanical vibration, and eliminating overvoltage.

Inactive Publication Date: 2008-06-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
View PDF0 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of intermittent power supply, a key problem to be solved is the inrush current, vibration and noise of the motor when the power is turned on again. Reaching more than 10 tim

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Control method and control device of power supply soft launch for intermittent power supply by balance beam type pumping unit
  • Control method and control device of power supply soft launch for intermittent power supply by balance beam type pumping unit
  • Control method and control device of power supply soft launch for intermittent power supply by balance beam type pumping unit

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] Hereinafter, the present invention will be further described in detail through specific embodiments and drawings.

[0034] Figure 1a is the main circuit diagram of a typical pumping unit motor load power soft input, where KM is a contactor, U1-U2, V1-V2, W1-W2 are the three-phase windings of the motor, and anti-parallel SCRs Modules SCR1, SCR2, SCR3 are internally connected to the windings in delta connection.

[0035] The detection unit 100 detects the currents of the three windings and the ABC three-phase voltage for the main control unit 203 to determine when the pumping unit is powered on and off; the detection unit 100 also measures the residual voltage U of the stator winding after power failure through a voltage transformer. W1-W2 , Used to judge when the rotor speed reaches the synchronous speed after power failure.

[0036] The main control unit 203 controls the thyristor drive unit to send a trigger pulse to the thyristor module, implements a fast soft turn-on at ...

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

No PUM Login to view more

Abstract

The invention discloses a power supply soft input controlling method and the controlling device for a walking-beam pumping unit under intermittent power supplying. The method of the invention measures the rotation speed of an electromotor by detecting the residual voltage of a stator winding after blackout when the electromotor supplies power intermittently, can complete the soft input of the power supply within a short time using a silicon controlled rectifier switch component to exert voltage step by step when the real speed of the electromotor approaches the synchronous speed. The controlling device of the invention includes a man-machine interface, a detection unit, a main controller, and a switching component. The invention measures the rotation speed of the electromotor by detecting the residual voltage of the stator winding after blackout, dispenses with a rotation speed sensor, and has high speed and precision. The silicon controlled rectifier component controls the on-off of the intermittent power supply, eliminates the overvoltage during the breakout due to the characteristic that the current is shut down when exceeding zero. Controlling the trigger of the silicon controlled rectifier around the synchronous speed when the electricity is turned on can implement the rapid soft input of the power supply, and then the impact current and the mechanical vibration can be avoided.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation machinery, and in particular relates to a method and a control device for soft input control of a beam pumping unit under intermittent power supply. Background technique [0002] A working condition cycle of beam pumping unit motor includes heavy-load working condition, light-load working condition, no-load working condition and generating working condition. [0003] The intermittent power supply of the motor of the pumping unit refers to disconnecting the power supply during the no-load and power generation conditions, so that the load of the pumping unit can continue to run by inertia during this period. The power loss is equal to zero or close to zero, thus achieving a very significant energy-saving effect; when the pumping unit rotates through a certain angle and requires the motor to provide torque under light load and heavy load conditions, the power is turned on through a controllable ...

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
no application Login to view more
IPC IPC(8): H02P7/24H02P6/06G05B19/04E21B44/00
Inventor 崔学深罗应立沈金波翟勇杨富刚
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap