Pulverized coal feeder frequency converter control system with low voltage ride-through power supply device
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology of low-voltage ride-through and frequency converter control, which is applied in the direction of reducing/preventing power oscillation, etc. It can solve problems such as powder feeding machine outage, speed, torque, and power changes, and achieve the effect of fast response speed
Active Publication Date: 2013-09-25
DATANG JIXI THERMAL POWER CO LTD
View PDF4 Cites 14 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0006] In order to solve the problem that the powder feeder system stops operating when the system low voltage occurs, resulting in changes in the rotational speed, torque, and power, the present invention provides a powder feeder inverter control system with a low-voltage ride-through power supply device. system
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
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
specific Embodiment approach 1
[0023] Specific implementation mode one: see figure 2 Describe this embodiment, the powder feeder inverter control system with low voltage ride-through power supply device described in this embodiment, it includes the first two-phase switch K3, the first three-phase switch K1, the second three-phase switch K2, the second A three-phase inductance L1, a second three-phase inductance L2, a first contactor KM1, a second contactor KM2, a transformer, a diode rectifier bridge 2, a three-phase inverter circuit 3, a first voltage detection module 1-1, a second Voltage detection module 1-2, third voltage detection module 1-3, fourth voltage detection module 1-4, fifth voltage detection module 1-5, first capacitor C1, second capacitor C2, third capacitor C3, Four capacitors C4, multiple cells and 6 resistors,
[0024] The 6 resistors are divided into two groups, each group has 3 resistors,
[0025] Multiple units have the same structure, and each unit includes a first diode, a second...
specific Embodiment approach 2
[0031] Specific implementation mode two: see figure 2 Describe this embodiment. The difference between this embodiment and the powder feeder inverter control system with a low-voltage ride-through power supply device described in the first embodiment is that the number of the multiple units described is greater than or equal to 2 and less than or equal to 12 .
specific Embodiment approach 3
[0032] Specific implementation mode three: see figure 2 Describe this embodiment. The difference between this embodiment and the powder feeder inverter control system with a low voltage ride-through power supply device described in the first embodiment is that the first voltage detection module 1-1 and the second voltage detection module 1-1 The structures of the module 1-2, the third voltage detection module 1-3, the fourth voltage detection module 1-4 and the fifth voltage detection module 1-5 are exactly the same.
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 invention provides a pulverized coal feeder frequency converter control system with a low voltage ride-through power supply device and relates to the field of pulverized coal feeder frequency converter control. The pulverized coal feeder frequency converter control system with the low voltage ride-through power supply device aims to solve the problems that when a pulverized coal feeder frequency converter control system encounters low system voltages, a pulverized coal feeder stops running, and changes of rotating speed, changes of torque and changes of power are caused. According to the pulverized coal feeder frequency converter control system with the low voltage ride-through power supply device, three-phase alternative current power energy passes through a second three-phase switch and a first contactor and is fed into a rectification loop formed by a first three-phase inducer and a diode rectification bridge, the three-phase alternative current power energy is transformed to direct current power energy and is stored in a first capacitor and a second capacitor, a BOOST type boost chopper circuit is formed by a second three-phase inducer and a three-phase inverter circuit, the direct current power energy on the first capacitor and the second capacitor can be transformed to direct current power energy with a higher voltage class, and the direct current power energy with the higher voltage class is stored in a third capacitor and a fourth capacitor and is fed into a frequency converter. A pre-charging loop is formed by a second contactor and three resistors of another set, and stable charging for the first capacitor, the second capacitor, the third capacitor and the forth capacitor when a voltage detecting module is powered on initially is achieved. The pulverized coal feeder frequency converter control system with the low voltage ride-through power supply device is applied to pulverized coal feeder control systems of boilers.
Description
technical field [0001] The invention relates to the field of frequency converter control for powder feeders. Background technique [0002] At present, the boiler powder feeder control system in power generation enterprises is mainly composed of frequency converter and drive motor. The voltage drop of the power system caused by various faults will lead to the shutdown of the powder feeder system, which will cause the serious accident of the generator set being shut down and off the grid. From the analysis of the control system to the shutdown process of the powder machine system, there are two reasons that can induce this problem: the inverter power circuit and the control power supply. The power circuit of the inverter is composed of a rectifier module, a DC link and an inverter module, such as figure 1 shown. The input terminals (R / L1, S / L2, T / L3) of the inverter are rectified (TM1, TM2, TM3) to direct current DC, and then converted to U / T1, V through inverter (TM4, TM5,...
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
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more