DCM (discontinuous conduction mode) control method of wind power generation current transformer BOOST circuit

Abstract

The invention discloses a DCM control method of a wind power generation current transformer BOOST circuit. By use of a digital control technology, operation control is carried out in a microprocessor or a digital signal processor chip through software. The invention describes the mechanism of the DCM of a boost chopper boost circuit under the digital control technology, brings forward a realization method of accurately describing digital discretization control under the DCM, and points out a determining method of the DCM and a CCM (continuous conduction mode). Of course, the method provided by the invention is also applied to the CCM. According to a boost control model in the embodiment of the invention, no stable state errors are generated, and reference current can be accurately tracked.

Description

technical field [0001] The invention relates to a control method of a BOOST circuit, in particular to a DCM mode control method of a BOOST circuit of a wind power converter. Background technique [0002] At present, most of the megawatt-level direct-drive wind power generation systems use such as figure 1 The shown back-to-back dual PWM converters are used as power converters, and the basic structure is AC-DC-AC topology. The back-to-back dual PWM converter includes: Du / dt filter 3 , AC / DC unit 1 , DC / AC unit 2 , and transformer 4 . The three-phase alternating current generated by the wind turbine is rectified into direct current through the machine-side converter module (AC / DC unit) 1, the energy is stored on the DC bus, and then inverted through the grid-side converter module (DC / AC unit) 2, The energy on the DC bus is converted into three-phase power that the grid can receive, thus forming an energy conversion loop from the motor to the grid, realizing energy transfer. ...

AI Technical Summary

Problems solved by technology

[0006] However, in digital control technology, using the method of discrete sampling control cannot achieve unlimited real-time sampling data in analog control technology. Therefore, in order to accurately track the reference current, in digital discrete control technology, it is necessary to judge the boost current work In which mode, and the corresponding control method; if the corresponding control method is not adopted, a steady-state error may occur, resulting in a deviation in tracking the reference current

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