Comprehensive protection method for direct-drive type permanent magnet wind generator

Abstract

The invention discloses a comprehensive protection method for a direct-drive type permanent magnet wind generator. The comprehensive protection method comprises the following four technological processes operating synchronously: a protection process of cooperation of an overcurrent protection method, an over-temperature protection method and an insulation protection method, a protection process of cooperation of the overcurrent protection method, the over-temperature protection method and the insulation protection method, a protection process of cooperation of an unbalance degree protection method, the over-temperature protection method and the insulation protection method, and a protection process of cooperation of the over-temperature protection method and the insulation protection method, when any one of the above protection processes is judged to be required to be subjected to shutdown protection, other protection processes of the whole method are terminated and the generator is maintained and protected. The method can perform effective and perfect protection on the direct-drive type permanent magnet wind generator by the above processes, so as to solve the technical problems that the generator maintaining method in the prior art has limited effects and imperfection for protection.

Description

technical field [0001] The invention relates to the technical field of motor protection, in particular to a comprehensive protection method for a direct-drive permanent magnet wind power generator. Background technique [0002] In recent years, as the technology of the wind power industry has gradually matured, the efficiency requirements for wind power generators have also been continuously improved, and direct-drive permanent magnet generators have been widely used in the wind power industry as a high-efficiency model. ; At the same time, in order to further improve the efficiency of wind power generators, various types of power electronic equipment are also used in the wind power industry along with direct-drive permanent magnet generators. [0003] However, in the common use of direct drive permanent magnet wind turbines and power electronic equipment, due to insufficient compatibility design and insufficient extreme design, direct drive permanent magnet wind turbines ar...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a comprehensive protection method for direct-drive permanent magnet wind power generators. Through the combined use of the overvoltage protection method and the insulation protection method, it solves the problem that the direct drive cannot be judged due to the overvoltage protection method. The degree of damage to the insulating material of the permanent magnet wind turbine winding, when the number of overvoltages that occur exceeds the set protection times or the total time of overvoltage exceeds the set protection time, it can only be protected by starting the generator and stopping the protection. Technical problems of limited effect and imperfect protection of direct-drive permanent magnet wind turbines

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