Fan converter power unit driving circuit

Abstract

The invention discloses a fan converter power unit driving circuit. The circuit comprises: a fiber interface module, a first photoelectric conversion circuit, an isolation driver, a parallel processing module and a sampling module. The parallel processing module generates a driving pulse which drives a power switch tube in a power unit according to a control signal transmitted by a main controller. Simultaneously, the parallel processing module determines a fault reason according to obtained electrical quantity information of the power unit, the information whether the power switch tube is over-temperature or a fault signal returned by the isolation driver and returns the fault information to the main controller so as to realize monitoring and recording of a fault situation of a fan converter power unit. A fault point can be specifically and timely found. The fault can be timely eliminated. Maintenance efficiency of the power unit and the fan converter power unit driving circuit can be increased.

Description

technical field [0001] The present application relates to the technical field of fan converters, in particular to a drive circuit for a power unit of a fan converter. Background technique [0002] As a clean renewable energy, wind energy is widely developed and utilized at present, among which wind power generation has become the most typical application form of wind energy. In the whole process of wind power generation, an important part of power transmission is undertaken by the wind turbine converter. The wind turbine converter converts the unstable electric energy generated by the wind turbine into electric energy with the same frequency and voltage level as the grid, and transmits it through the grid. [0003] With the development of science and technology and practical application requirements, wind power generation tends to develop in the direction of single-machine high-power and ultra-high-power, and the power level of wind turbine converters is also constantly deve...

AI Technical Summary

Problems solved by technology

The most important module in the wind turbine converter is the power unit. With the continuous increase of the power level of the single machine, the traditional single power switch tube, such as IGBT (Insulated Gate Bipolar Transistor, Insulated Gate Bipolar Transistor, ) constitutes a power unit that is far from meeting the power requirements, and the parallel operation mode of power switch tubes must be adopted

[0004] The power unit of the traditional single power switch tube has low power, fewer failure modes, and the reliability problem is easier to solve, so it generally adopts a simple circuit structure, and the control method is relatively simple. Generally, the upper and lower tubes The pulse signal is given by two downlink optical fibers, all logic of the pulse is completed by the main controller, and the driving circuit only completes the conversion function of the control signal to the power switch tube. 1. The power switch tube has high synchronization requirements, the electromagnetic environment is harsh, and the failure mode is complex. If the traditional drive circuit is used, the working process of the power unit will have a large safety hazard. Moreover, when the power unit fails, the cause of the failure cannot be analyzed. , the recovery of the fault can only be carried out by replacing the module, which is not conducive to the improvement of the function, and at the same time causes the maintenance cost to be too high

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