Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and device for reactive power advance prediction and compensation of DC drive hoist

A technology of DC drive and compensation method, applied in reactive power compensation, load forecasting in AC network, reactive power adjustment/elimination/compensation, etc., can solve problems such as long lag time, power grid impact, safety accidents, etc., to avoid The effect of overcompensating or fully compensating

Inactive Publication Date: 2019-02-15
HENAN POLYTECHNIC UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the operation of the hoist, the speed changes frequently and the reactive power demand generated will cause a large impact on the power grid, so it is necessary to install a reactive power compensation device
The currently used reactive power compensation devices mainly include switching fixed capacitors, static var compensators (SVC), static var generators SVG, and magnetically controlled dynamic reactive power compensation devices. These reactive power compensation devices are all in After the measured reactive power changes, the corresponding compensation components are put into operation. The compensation control device has a response time of at least about 20ms and a long lag time from the measured reactive power change to the completion of the input of the compensation components. , causing the hoist to switch from one working stage to another, the reactive power compensation device may produce overcompensation or full compensation, resulting in overvoltage, thus causing safety accidents

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
  • Method and device for reactive power advance prediction and compensation of DC drive hoist
  • Method and device for reactive power advance prediction and compensation of DC drive hoist
  • Method and device for reactive power advance prediction and compensation of DC drive hoist

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A reactive power advance prediction and compensation method for a DC drive hoist, such as figure 1 , 2 , 3, including the following steps:

[0034] Step 1. According to the experimental preset reactive power compensation operation diagram; through online experiments, it is measured that under 30 kinds of loads from full load to light load and no load, the hoist operates in different working stages (different speeds) when lifting or lowering materials. Below) the size of the required reactive power; in order to prevent over-compensation, adopt reactive power control, use the power factor as a limiting condition, and determine the different speed ranges under each load when the hoist is lifted or lowered according to formula (1) The reactive power compensation capacity is generated, and the reactive power compensation operation diagram is generated and stored in the reactive power compensation operation diagram preset and correction module;

[0035]

[0036] In formu...

Embodiment 2

[0056] A reactive power advance prediction compensation device for a DC drive hoist, such as figure 1 , 2 , 3, the device includes the main motor of the hoist, signal detection circuit 7, reactive power compensation device main circuit 6, TCR thyristor control switch and reactive power compensation control device;

[0057] The main circuit of the reactive power compensation device is connected to the main motor of the hoist through a TCR thyristor control switch to compensate the reactive power of the main motor of the hoist;

[0058] The signal output of the reactive power compensation control device is connected with the TCR thyristor control switch to control the opening and closing of the TCR thyristor;

[0059] The signal detection circuit includes reactive power sensors, active power sensors, encoders, and pressure sensors to detect the active power, reactive power, power factor, speed and load of the main motor of the hoist in real time, and convert them into electrica...

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 reactive advance predictive compensation method of a direct current drive hoist. The reactive ahead predictive compensation method of the direct current drive hoist comprises the steps that firstly, reactive power compensation running charts are preset according to the experiment and stored in a runner chart presetting and control module of a reactive power compensation device; in the running process of the hoist, a reactive power compensation running chart selection module automatically selects a reactive power compensation running chart according to the running direction, the load and the speed, then a reactive power compensation controller performs reactive regulation according to the running chart, particularly before hoist running working state conversion, namely, before great change of the running speed and the reactive power requirement, a reactive power compensation device is operated to act in advance (50 ms), and overcompensation or full compensation is avoided. According to the method, reactive advance compensation of the direct current drive hoist can be realized, reactive power rapid and accurate compensation can be realized with an intelligent control algorithm, the method has excellent robustness, influences of external and internal interference to the system stability can be effectively reduced, and the power factor is ensured to fluctuate in the range from 0.95 to 0.98.

Description

technical field [0001] The invention relates to a method and device for reactive power advance prediction and compensation of a DC drive hoist. Background technique [0002] The controllable rectification large-scale DC drive hoist has the characteristics of good speed regulation performance, wide speed regulation range, large starting and braking torque, large low-speed torque, stable operation and high efficiency, and has been widely used in mining enterprises. However, during the operation of the hoist, the speed changes frequently, and the generated reactive power demand will cause a large impact on the power grid, so it is necessary to install a reactive power compensation device. The currently used reactive power compensation devices mainly include switching fixed capacitors, static var compensators (SVC), static var generators SVG, and magnetically controlled dynamic reactive power compensation devices. These reactive power compensation devices are all in After the m...

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 Patents(China)
IPC IPC(8): H02J3/18
CPCH02J3/003H02J3/1892Y02E40/30
Inventor 王福忠高彩霞杜宝玉朱运华荊鹏辉朱瑞卿王欣
Owner HENAN POLYTECHNIC UNIV