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Pulverized coal feeder frequency converter control system with low voltage ride-through power supply device

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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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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.

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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

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
Inventor 钟国强王显亮邱长庆
Owner DATANG JIXI THERMAL POWER CO LTD
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