Frequency converter system input side fault protection method and control system

A technology of fault protection and frequency converter, applied in the field of frequency converter to achieve the effect of efficient operation

Pending Publication Date: 2022-06-21
常州捷驰达电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a fault protection method and control system on the input side of the inverter syst

Method used

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  • Frequency converter system input side fault protection method and control system
  • Frequency converter system input side fault protection method and control system
  • Frequency converter system input side fault protection method and control system

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0060] Example 1: Combining Image 6 For the inverter system composed of a single inverter, the fault protection method on the input side of the inverter system is explained.

[0061] In the event of a fault on the input side of the inverter system composed of a single inverter, the contactors KM1, KM2, KM3 and KM4 can be controlled to act according to the location of the fault to protect the inverter.

[0062] When it is determined that the power supply of the inverter is faulty, the action of KM1 can be controlled to break the link between the inverter and the power supply, so as to ensure the safety of the power supply of the rectifier circuit and other systems of the inverter, and no power supply accident and damage to the inverter caused by it. At the same time, it can act The contactor KM4 ensures the energy reserve of the inverter when it is stopped, because only the inverter needs to be stopped at this time, and the running state at the time of the fault is saved as th...

Example Embodiment

[0065] Example 2: Combination Figure 7 For a frequency converter system composed of multiple frequency converters, the protection method for electric shock on the input side of the frequency converter system is described.

[0066] like Figure 7 As shown in the figure, in the inverter system composed of multiple inverters, the fault protection execution unit on the input side of the inverter system includes the fault protection execution unit between the inverters, such as Figure 7 The contactors KMO1-1 to KMO1-n in the system can be adjusted according to the actual needs of the system.

[0067] According to the fault type on the input side of the inverter system, when a power shaking fault occurs, or a short-term power failure fault, it can be determined according to Figure 5 The steps shown, first determine the number of faulty drives. At this time, the number of faulty inverters and the number of normal running inverters can be determined respectively.

[0068] The t...

Example Embodiment

[0077] Example 3: Combination Figure 7 For the inverter system composed of multiple inverters, the protection method for power failure at the input side of the inverter system is described.

[0078] When a power failure occurs in the inverter system, each inverter in the inverter system needs to ensure coordinated and associated shutdown. Determine the downtime of the inverter system. According to the number of faulty inverters, combined with the basic resource table of the inverter system, and the system maintenance energy determined by formula 2 and formula 3, calculate the required time for a single inverter to stop according to formula 4. energy:

[0079] W stop = P stop *T stop = U stop I stop *T stop (4)

[0080] Among them, W stop is the energy required for stopping, P stop is the power required for stopping, *T stop is the time required for stopping, U stop is the power supply voltage of the inverter when it is stopped, and I stop is the power supply current when it...

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Abstract

The invention discloses a frequency converter system input side fault protection method and a control system, and the fault protection method comprises the steps: employing a breaking fault frequency converter and a fault unit according to different fault types when the input side of a frequency converter system has a partial fault, and guaranteeing the normal operation of the system; and when the system must be shut down due to the fault, storing the operating parameters when the fault occurs, and enabling each frequency converter in the system to be shut down in a coordinated and associated manner. The frequency converter system input side fault protection control system comprises a protection system communication unit, a fault detection unit, a logic control unit and a fault protection execution unit. Component parts in the fault protection system can be configured according to actual needs, and convenience and flexibility are achieved. Compared with the prior art, the method has the beneficial effects that effective protection and fault processing are carried out on the fault of the input side of the frequency converter system, the requirements of the frequency converter system are better met, and the safety of the frequency converter system and the reliability of system operation are improved.

Description

technical field [0001] The invention relates to the field of frequency converters, more specifically, to a fault protection method and a control system at the input side of a frequency converter system. Background technique [0002] At present, the frequency converter system composed of multiple frequency converters is more and more widely used in practical applications. Through the collaborative control of multiple inverters, the process requirements of complex production sites can be completed. The power supply of the inverter system can be provided individually for each inverter, or it can be supplied uniformly. In this way, when dealing with faults on the input side of the system, it is necessary to distinguish between different situations for fault handling. [0003] During the normal operation of the inverter, the three-phase industrial frequency power supply is used. When the power grid fluctuates, such as a sudden loss of power in a short period of time or a short-t...

Claims

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Application Information

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IPC IPC(8): H02H7/12H02M1/32H02M1/34
CPCH02H7/1216H02M1/32H02M1/34
Inventor 唐宇
Owner 常州捷驰达电子科技有限公司
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