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A restart control method and device for a reset-locked frequency converter

A frequency converter and restarting technology, applied in the field of electronics, can solve the problems that the frequency converter cannot start the frequency converter, the fault state of the frequency converter cannot be reset, and the restart method of the frequency converter is invalid, etc., and achieves the effect of improving the success rate of restarting.

Active Publication Date: 2018-07-10
JIANGSU STATE GRID AUTOMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, refer to Figure 1b , in the existing frequency converter restart method, if the high level of the frequency converter fault state Fault occurs after the fault reset output ResetFault and the restart output ReStart become high at the same time, and the frequency converter is an edge reset frequency converter , because the ResetFault output signal is high level during the high-level output time of Fault, at this time ResetFault cannot output an edge reset signal, resulting in the fault state of the inverter cannot be reset, so the inverter cannot be restarted
[0005] In addition, the fault state of the inverter is reset, and after the inverter is successfully started, the inverter may have a fault and flip again, causing the fault state of the inverter to change to a high level again.
At this time, the existing inverter restart method has already output the fault reset output and restart output, resulting in the failure to start the inverter after the inverter fails again.
refer to Figure 1c , after the running state confirmation line, both the fault reset output ResetFault and the restart output ReStart become low level, and then the inverter fault state Fault appears high level again, and the existing inverter restart method fails

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  • A restart control method and device for a reset-locked frequency converter
  • A restart control method and device for a reset-locked frequency converter
  • A restart control method and device for a reset-locked frequency converter

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Embodiment 2

[0041] This embodiment provides a new reset-locked inverter restart control method on the basis of the first embodiment above. In this embodiment, the fault state of the inverter is reset by means of continuous reset pulses, that is, ResetFault is continuous reset pulse. Figure 3a It is a flow chart of a restart control method for a reset-locked frequency converter provided in Embodiment 2 of the present invention, as shown in Figure 3a As shown, the reset-locked inverter restart control method may include:

[0042] Step 21. After monitoring the restart trigger event of the frequency converter, if the start timeout time is not reached, monitor the fault state of the frequency converter in real time.

[0043] Step 22. If it is detected that the fault state of the frequency converter is at a high level, the control restart output is at a low level, and the fault state of the frequency converter is reset by outputting continuous reset pulses through fault reset.

[0044] comb...

Embodiment 3

[0055] On the basis of the above-mentioned embodiments, this embodiment specifically provides a new reset-locked inverter restart control method. Figure 4a It is a flow chart of a restart control method for a reset-locked inverter provided in Embodiment 3 of the present invention, as shown in Figure 4a As shown, the reset-locked inverter restart control method may include:

[0056] Step 31, logic initialization.

[0057] Step 32. Calculate bus voltage U ab , U bc and U ca .

[0058] Step 33, calculate the control voltage U LN .

[0059] Step 34, read the running / stop status of the frequency converter and the fault status of the frequency converter.

[0060] By reading Run / Stop and Fault to identify whether the inverter is running normally and whether a fault has occurred. As shown in Table 1-1, when the inverter is running normally, generally Run / Stop is at high level and Fault is at low level; when the inverter stops normally, generally Run / Stop is at low level and ...

Embodiment 4

[0074] This embodiment provides a reset-locked inverter restart control device. Figure 5 It is a structural diagram of a reset-locked inverter restart control device provided in Embodiment 4 of the present invention, as shown in Figure 5 As shown, the reset-locked inverter restart control device may include:

[0075] The fault monitoring module 51 is used to monitor the fault state of the frequency converter in real time if the start-up timeout period has not been reached after the frequency converter restart trigger event is detected;

[0076] The fault reset module 52 is used to control the restart output to be low level if it is detected that the fault state of the frequency converter is high level, and reset the fault state of the frequency converter through the fault reset output;

[0077] The frequency converter restart module 53 is used to control the restart output to be at a high level to restart the frequency converter if it detects that the fault state of the fre...

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Abstract

The embodiment of the invention discloses a restarting control method and apparatus for a resetting locking type frequency converter. The method comprises: after a re-starting trigger event of a frequency converter is monitored, if starting timeout is not reached, a fault state of the frequency converter is monitored in real time; if the fault state of the frequency converter is monitored to be a high level state, the re-starting output is controlled to be at a low level and the fault state of the frequency converter is reset based on a fault reset output; and if resetting of the fault state of the frequency converter is monitored to be successful, the re-starting output is controlled to be at a high level, so that the frequency converter is restarted. According to the technical scheme provided by the embodiment of the invention, when the fault state of the frequency converter is monitored to be at a high level, the fault state of the frequency converter is locked to output reset pulses by multiple times until the fault of the frequency converter is reset; and after the successful resetting, the frequency converter is started. Compared with the prior art, the re-starting success rate of the reset frequency converter is improved.

Description

technical field [0001] The embodiments of the present invention relate to the field of electronic technology, and in particular to a restart control method and device for a reset-locked frequency converter. Background technique [0002] The frequency converter is a power control device that uses frequency conversion technology and microelectronics technology to control the AC motor by changing the operating voltage and frequency of the motor. It has a control voltage and a bus voltage. During the use of the inverter, the mains or three-phase AC power is often unstable due to grid voltage disturbances, resulting in unexpected shutdown of the inverter and causing huge losses to production. [0003] In the existing inverter restart method, the collected bus voltage or control voltage drops and recovers within the set time, and after detecting that the Run / Stop state of the inverter has changed to a low level, the fault reset outputs ResetFault and Restart the output ReStart to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36
CPCH02M1/36
Inventor 姜万东王晓堃周海涛沈克明
Owner JIANGSU STATE GRID AUTOMATION TECH