Method for controlling converter to absorb active power, converter controller and converter

Abstract

The invention discloses a method for controlling a converter to absorb active power, a converter controller and the converter, applied to the field of an electric power system; the problem of damage to an IGBT, a capacitor and other devices caused by the fact that a circuit breaker cannot be disconnected in time when a direct current voltage reaches the safety voltage of the IGBT, the capacitor and other devices can be solved. The method comprises the steps of receiving collected first alternating-current voltage and first alternating-current current transmitted between the converter and a power grid; calculating positive and negative sign symbols of the first active power transmitted between the converter and the power grid according to the alternating-current voltage and the alternating-current current; judging whether the active power is output from the power grid to the converter or not according to the positive and negative sign symbols of the first active power; and when the first active power is output from the power grid to the converter, outputting a control signal for blocking the pulse for driving the IGBT of an inverter in the converter.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a method for controlling the absorption of active power by a converter, a converter controller and a 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. The rectifier, braking unit and inverter are power units, which are mainly composed of IGBT (Insulated Gate Bipolar Transistor, insulation barrier bipolar transistors). Under normal circumstances, the electric energy converted by the generator is injected into the converter from the rectifier, and then fed to the grid side by ...

AI Technical Summary

Problems solved by technology

[0003] Embodiments of the present invention provide a method for controlling the active power absorbed by a converter, a converter controller and a converter, 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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