A Method of Voltage Sharing in Series of Insulated Gate Bipolar Transistors Based on Smooth Sliding Mode Control

Abstract

The invention provides a smooth sliding-mode control based series voltage-sharing method of an insulated gate bipolar transistor. The smooth sliding-mode control based series voltage-sharing method of the insulated gate bipolar transistor (IGBT), provided by the invention, is used for eliminating a buffeting phenomenon output from a sliding-mode control system and is characterized by comprising the following steps of 1, setting an ideal collector-emitter voltage curve; 2, setting a smooth sliding-mode controller model; 3, writing a mathematical expression of the smooth sliding-mode controller model into a field programmable gate array of an arithmetic unit; and 4, enabling an actual collector-emitter voltage of the IGBT to follow with the set ideal collector-emitter voltage curve after the field programmable gate array of the field programmable gate array is written into the smooth sliding-mode controller so as to finally achieve the purpose of voltage sharing. By the method, the voltage unbalance degree of the IGBT during the transient switching process can be effectively reduced, the input waveform is controlled to be very smooth, no buffeting phenomenon is generated, and thus, the impact on the IGBT is low.

Description

technical field [0001] The invention relates to a semiconductor control technology, in particular to a method for voltage equalizing in series with insulated gate bipolar transistors based on smooth sliding mode control. Background technique [0002] Voltage Source Converter-High Voltage Direct Current (VSC-HVDC, also known as flexible DC transmission, HVDC-Flexible) based on voltage source converter is a new generation of DC transmission technology, which can be connected to weak grids and Source-load power supply, with power grid black start capability, fast dynamic response, excellent harmonic characteristics, small footprint, etc., has been developed since the first industrial test project established by ABB in Sweden in 1997, and has been successfully used in many The country is put into use. The research and development of VSC-HVDC technology can promote the grid connection of renewable energy such as solar energy, wind power, and tide (distributed power generation gr...

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Problems solved by technology

[0005] A field-programmable gate array-based IGBT series voltage equalization method, patent application number: 201510448731.7, the method in this patent can effectively suppress the overvoltage during the switching process, the control algorithm is simple, easy to implement, and the hardware design cost is low; but Voltage imbalance during switching remains high and chattering is severe

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