Converter controller, converter and converter control method

Abstract

The invention provides a converter controller, a converter and a converter control method, and belongs to the field of power systems. The problem that devices like IGBTs and capacitors may be damaged when the direct voltage reaches the safety voltage of the devices like IGBTs and capacitors can be solved. The converter controller comprises a receiving module which is configured to receive a direct voltage across the two ends of a DC support capacitor in a converter acquired by an acquisition unit in the converter in a preset sampling period, a calculating module which is configured to calculate the energy increment of the DC support capacitor in a current sampling period based on the direct voltage in the current sampling period received by the receiving module and the direct voltage in a previous sampling period, an energy comparing module which is configured to compare the energy increment in the current sampling period with a preset energy threshold, and an output module which is configured to output an IGBT gate turn-off driving signal to a rectifier and an inverter in the converter when the energy increment in the current sampling period is greater than the 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...

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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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