Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Dynamic process analysis method of induction motor

A technology for induction motors and dynamic processes, applied to electrical components, circuit devices, AC network circuits, etc., can solve problems such as inconsistencies in calculation results, influence on simulation results, and system hazards, saving calculation time and workload, and clear physical meaning , the effect of fast calculation speed

Active Publication Date: 2018-09-04
KUNMING UNIV OF SCI & TECH
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The accuracy of the model will directly affect the simulation results and the decision-making scheme based on it. An inappropriate load model will make the calculation results inconsistent with the actual situation, thereby posing potential dangers to the system or causing unnecessary waste.

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
  • Dynamic process analysis method of induction motor
  • Dynamic process analysis method of induction motor
  • Dynamic process analysis method of induction motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1: as Figure 1-2 As shown, a method for analyzing the dynamic process of an induction motor is characterized by: determining the expression of the mechanical torque of the induction motor; The relational expression of time; determine the value of the constant in the slip expression; get the trend of active power and reactive power changing with time in the dynamic process of the induction motor. The specific steps are as follows: Using the first-order mechanical transient model, the relationship between active power, reactive power and slip, frequency and voltage can be obtained through the T-shaped equivalent circuit. This relationship can be appropriately simplified as follows:

[0045] 1) Exciting circuit reactance x μ much greater than the stator reactance x sσ , namely x μ >>x sσ

[0046] 2) Ignore the stator and field circuit resistance

[0047] Through the above equivalent circuit diagram and simplified conditions, the following figure 1 The T-...

Embodiment 2

[0085] Embodiment 2: This embodiment takes a three-phase four-pole squirrel-cage rotor induction motor as an example. In this dynamic process analysis and calculation, a first-order mechanical transient model is used, and the analysis is carried out according to the method in Embodiment 1. The induction motor is The rotating magnetic field is generated by the three-phase current of the stator winding, and then the electromagnetic induction principle is used to generate the induced electromotive force and the induced current in the rotor winding, and the electromagnetic torque is generated by the interaction of the air gap magnetic field and the rotor induced current for energy conversion. The parameters are shown in Table 1.

[0086] Table 1 Induction motor operating parameter settings

[0087] parameter

The sum of stator inductance and rotor inductance (L 1 )

Exciting inductance (L μ )

Rotor inertia time constant (T j )

value

0.007248H

...

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 relates to a dynamic process analysis method of an induction motor, and belongs to the field of load modeling of a power system. The method comprises the steps of determining an expression of mechanical torque of the inductor motor; deducing a relation expression of slip ratio on frequency, voltage and time of the induction motor during the dynamic process according to a rotation motion equation and a power equation of the induction motor; determining a constant value in the slip ratio expression; and obtaining the trend of an active power and a reactive power changing with timeof the induction motor during the dynamic process. When the frequency or the voltage of a system where the induction motor is located fluctuates, the dynamic changing trend of the slip ratio, the mechanical torque, the active power and the reactive power of the induction motor can be rapidly analyzed by the method.

Description

technical field [0001] The invention relates to a dynamic process analysis method of an induction motor, which belongs to the field of power system load modeling. Background technique [0002] With the gradual development and improvement of my country's "West-East Electricity Transmission, North-South Interconnection, and National Networking" strategic project, it has become an inevitable development trend to realize asynchronous interconnection among provincial power grids. According to the UHV power grid development plan, my country will form a North China-Central China-East China cross-regional synchronous interconnection grid in the future. This operation mode puts forward new requirements for the accuracy of digital simulation analysis of the power system. influence cannot be ignored. The power system is a nonlinear dynamic system, and the stability itself belongs to the dynamic category. The frequency characteristics and voltage characteristics are considered in the lo...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 海世芳孙士云范小红王杨孙德娟安德超张雪娟郑新宇
Owner KUNMING UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com