A kind of mmc module control pulse modulation method, device, equipment and medium

Abstract

The invention discloses an MMC module control pulse modulation method, device, equipment and medium. Signal decomposition is performed on a signal to be modulated, and a first signal component or a third signal component obtained from the decomposition is subjected to carrier phase-shift sinusoidal pulse width modulation to obtain a first modulation signal; the second signal component or the fourth signal component is subjected to the lowest level approximation modulation to obtain the second modulation signal; the control sequence of the MMC sub-module is determined according to the pulse control signal obtained by the superposition of the first modulation signal and the second modulation signal; according to the control The sequence and pulse control signals generate and output the control pulses of the MMC sub-module, which solves the problem that NLC can form a good waveform when the number of control modules is large. When the number of modules is low, the harmonics are large and the waveform quality is very poor. When the number of MMC sub-modules is low, harmonics can be eliminated and a good waveform can be formed. However, in the case of multiple modules, the calculation and control are too difficult, which is a technical problem that is difficult to achieve.

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...

AI Technical Summary

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

Images