Control pulse modulation method, device and equipment and storage medium

A technology for controlling pulses and modulation methods, which is applied in the output power conversion device, electrical components, and the conversion of AC power input to DC power output, etc. The effect of flexible and accurate control

A technology for controlling pulses and modulation methods, which is applied in the output power conversion device, electrical components, and the conversion of AC power input to DC power output, etc. The effect of flexible and accurate control

CN112072944AActive Publication Date: 2020-12-11ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Control pulse modulation method, device and equipment and storage medium
  • Control pulse modulation method, device and equipment and storage medium
  • Control pulse modulation method, device and equipment and storage medium

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Embodiment Construction

[0052] The embodiments of the present invention provide a control pulse modulation method, device, equipment and storage medium, which are used to solve the problem that the existing control pulse modulation methods cannot accurately control the voltage waveform and suppress harmonics when the voltage variation range is large. Inconvenient technical issues.

[0053] Nearest Level Controll (NLC) is also called quantized rounding method. Its principle is to use the nearest level to approximate the modulation wave instantaneously. The principle is simple and easy to implement, and it is suitable for occasions where the MMC level is very high. This method is currently the most practical MMC modulation method, and has been practically applied in many projects.

[0054] From the output voltage waveform, the nearest level approximation modulation is similar to the ladder wave modulation. This modulation method is simple in principle, easy to implement and high in efficiency. However, w...

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Abstract

The invention discloses a control pulse modulation method, device and equipment and a storage medium, and relates to a lowest level approximation modulation module, a space vector pulse width modulation module and a plurality of MMC sub-modules. The method comprises the steps of receiving a to-be-modulated signal, and generating a first driving signal through the lowest level approximation modulation module; receiving the to-be-modulated signal and a preset triangular carrier signal, and generating a second driving signal through a space vector pulse width modulation module; collecting a firstdriving signal or a second driving signal according to the real-time conduction number of modulation sub-modules of the lowest level approximation modulation module, and generating a pulse control signal; determining a control sequence of the plurality of MMC sub-modules according to the pulse control signal; based on the pulse control signals and the control sequence, generating and outputting control pulses of the MMC sub-modules. Thus, the voltage waveform can be flexibly and accurately controlled under the condition that the voltage change range is large, and meanwhile harmonic interference is restrained.

Description

technical field [0001] The present invention relates to the technical field of signal modulation, in particular to a control pulse modulation method, device, equipment and storage 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 extremely important engineering application prospects. Compared with traditional two-level or three-level VSC, MMC and two-level and multi-level voltage source converter topology, MMC has no DC energy storage capacitor between the positive and negative poles of the DC side, through the control In the switching state of all sub-modules, the converter can output a voltage waveform with good waveform quality in the AC measurement, and maintain the dynamic stability of the DC voltage on the DC side. The advantages of flexible voltage level control, less harmonic content, low switching loss, and small filter capacity h...

Claims

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Application Information

Patent Timeline
11 Dec 2020
Publication
CN112072944A
IPC
H02M7/5395; H02M7/5387; H02M7/501; H02M1/12
CPC
H02M1/12; H02M7/501; H02M7/53875; H02M7/5395; H02M7/53876
Inventors
ιͺ†ζ½˜ι’Ώ; 刘正富