Wind power converter controller, wind power converter and control method for wind power converter

Abstract

The invention provides a converter controller, a converter and a control method for the converter, which relate to the field of power systems and can solve the problem of damage to IGBTs, capacitors and other devices when the DC voltage reaches the safe voltage of devices such as IGBTs and capacitors question. The converter controller includes: a receiving module configured to receive the DC voltage across the DC support capacitor in the converter collected by the acquisition unit in the converter with a preset sampling period; a calculation module configured to receive The module receives the DC voltage of the current sampling period and the DC voltage of the previous sampling period to calculate the energy increment of the DC support capacitor in the current sampling period; the energy comparison module is configured to compare the energy increment of the current sampling period with the preset energy threshold The output module is configured to output an IGBT gate turn-off driving signal to a rectifier and an inverter in the converter when the energy increment of the current sampling period is greater than a preset energy threshold.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a converter controller, a converter and a control method for the converter. Background technique [0002] In the electric power generation system, the generator converts mechanical energy into electrical energy, and then incorporates the electrical energy into the grid through a converter and a transformer. The converter, as an energy conversion device, plays the role of energy conversion. The converter mainly includes a rectifier on the generator side, a DC support capacitor, a braking unit and an inverter on the grid side, and a circuit breaker is installed at the connection with the generator and the grid. Among them, the rectifier, braking unit and The inverter is collectively referred to as a power unit of the converter, which is mainly composed of an IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor). Under normal circumstances, the electric energy con...

AI Technical Summary

Problems solved by technology

[0003] According to an embodiment of the present invention, a converter controller, a converter, and a control method for a converter are provided, which can solve the shock generated at the moment when the IGBT is turned off during the process of disconnecting the circuit breaker and shutting down the converter The peak value of the voltage will exceed the safe voltage of IGBT, capacitor and other devices, which will lead to the problem of overvoltage breakdown of IGBT, capacitor and other devices

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