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

Method and system for detecting open phase

A phase loss detection and phase loss technology, applied in electrical components, emergency protection circuit devices, etc., can solve the problems of general inverter phase loss detection and protection methods are no longer effective, power does not pass through rectifier circuits, and motor control algorithms are complex. , to achieve the effect of simple and effective software implementation, strong practicability and low cost

Active Publication Date: 2017-02-15
威胜能源技术股份有限公司
View PDF5 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the brushless doubly-fed motor control system, the power side of the motor is connected to the high-voltage power grid through a power switch, and the voltage is generally above 6KV or 10KV. Due to the high voltage level, it is impossible to divide the voltage directly through the voltage dividing resistor, and the power does not pass through the rectification circuit. , so the existing phase loss detection and protection methods commonly used in general-purpose inverters are no longer effective, such as the phase loss detection method based on DC bus described in patent CN201010294959
In addition, due to the special structure of the two sets of windings of the brushless doubly-fed motor, its motor control algorithm is more complicated than that of conventional motors, and consumes a lot of DSP resources. CN200810135263 and patent CN201510438932 used multiple coordinate transformations) to occupy a large amount of DSP resources thereby affecting the normal execution of the control algorithm

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 system for detecting open phase
  • Method and system for detecting open phase
  • Method and system for detecting open phase

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Embodiment 1: Brushless doubly-fed motor control system such as figure 1 , combined with the special structure and control requirements of the brushless doubly-fed motor control system, this method divides the phase loss detection on the power side of the brushless doubly-fed motor into three steps:

[0065] The first step is the voltage phase loss detection of the high-voltage input power supply on the power side. This detection can be carried out after the control system of the brushless double-fed motor is powered on, and there is no need to power on the body of the brushless double-fed motor.

[0066] The second step is to detect the lack of phase of the power winding current before the operation of the brushless doubly-fed motor. Before the start of the brushless doubly-fed motor, the detection is carried out by closing the power switch of the power winding and energizing the power winding.

[0067] The third step is the phase loss detection during the operation of...

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 method and a system for detecting open phase. The method comprises the following steps: 1, according to acquired three phases of voltage values or current values Sa, Sb and Sc, the average three-phase value Savg and the maximum value Smax are calculated in real time; 2, filtering processing is carried out on the Smax and the Savg respectively, and an Smaxf1 and an Savgf1 are obtained; 3, conversion values Smaxf and Savgf for the Smaxf1 and the Savgf1 are calculated; 4, a voltage open phase detection judgment coefficient Kx is calculated; and 5, open phase judgment is carried out based on the Kx, if the Kx is larger than an open phase fault threshold Ks, happening of the open phase is judged, or otherwise, no open phase fault exists, and Ks is between 10% to 20%. The method is easy to implement, the calculation amount is small, and the method of the invention is a general defect detection method and is particularly applied to real-time open phase protection on a brushless doubly-fed machine.

Description

technical field [0001] The invention relates to a phase loss detection method and system, belonging to the technical field of power electronics and motor control. . Background technique [0002] There are many types of existing phase loss detection methods, which are generally implemented by hardware circuits, but it is not suitable to modify some mature circuits and add hardware circuits. [0003] In addition, when the brushless doubly-fed motor starts and runs, it also needs to perform phase loss detection; [0004] The brushless double-fed motor has a special structure, which is different from ordinary motors. There are two sets of stator windings at the stator end. Designed as low voltage, the low voltage winding is connected to the low voltage power grid through the controller, and the speed regulation of the motor can be realized by using the controller. Compared with ordinary AC motors, this motor has no carbon brushes and commutators, and can realize high-power hi...

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): H02H7/09H02H7/08
CPCH02H7/0805H02H7/09
Inventor 刘铁军金维宇陶泽安黄自翔李途宏
Owner 威胜能源技术股份有限公司
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