MMC module control pulse modulation method and device, equipment and medium

Abstract

The invention discloses an MMC module control pulse modulation method and device, equipment and a medium. The method comprises the steps of carrying out the signal decomposition of a to-be-modulated signal, and carrying out the carrier phase shift sine pulse width modulation of a first signal component or a third signal component obtained through decomposition, and obtaining a first modulation signal, performing lowest level approximation modulation on the second signal component or the fourth signal component to obtain a second modulation signal, determining a control sequence of the MMC sub-modules according to a pulse control signal obtained by superposing the first modulation signal and the second modulation signal, according to the control sequence and the pulse control signal, generating and outputting the control pulse of the MMC sub-module, so that the technical problems that the NLC can form a very good waveform in an occasion with a large number of control modules, the harmonic wave is very large and the waveform quality is very poor in an occasion with a small number of modules, and SVPWM can eliminate harmonic waves and form a good waveform when the control number of MMC sub-modules is low, but in a multi-module occasion, the calculation control difficulty of SVPWM is too large, and SVPWM is difficult to achieve can be solved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an MMC module control pulse modulation method, device, equipment and medium. Background technique [0002] With the rapid development of power electronics technology, Modular Multilevel Converter (MMC), as a new topology of multilevel converter, has shown its main engineering application prospects. Compared with traditional two-level or three-level voltage source converters, MMC has no DC energy storage capacitor between the positive and negative poles of the DC side. By controlling the switching status of all sub-modules, the converter can output The voltage waveform with good waveform quality keeps the DC voltage dynamic and stable on the DC side. The advantages of flexible voltage level control, less harmonic content, low switching loss, and small filter capacity have improved the efficiency and economy of the converter, and have been widely used and researched in t...

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Problems solved by technology

[0006] The invention provides an MMC module control pulse modulation method, device, equipment and medium, which are used to solve the problem that NLC can form a good waveform when the number of control modules is large, and the harmonics are large when the number of modules is low. Very poor; SVPWM can eliminate harmonics and form a good waveform when the number of MMC sub-modules is controlled, but in the case of multiple modules, its calculation and control are too difficult and difficult to achieve technical problems

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