Frequency converter system input side fault protection method and control system

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...

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 system to solve the protection problem when the input side fault occurs during the operation of the inverter system composed of multiple inverters

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