Modular cascaded multilevel converter based on hybrid modulation of pam and pwm

A cascaded multi-level, hybrid modulation technology, applied in the direction of irreversible DC power input conversion to AC power output, output power conversion device, AC power input conversion to DC power output, etc., can solve the problem of large switching loss, Problems such as high switching frequency and low harmonic content achieve the effects of small switching loss, reduced quantity, and precise control

Active Publication Date: 2017-07-25
南京悦源电力研究院有限公司
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Problems solved by technology

However, the switching frequency of each sub-module is high, so its switching loss is large, and the harmonic content is small

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  • Modular cascaded multilevel converter based on hybrid modulation of pam and pwm
  • Modular cascaded multilevel converter based on hybrid modulation of pam and pwm
  • Modular cascaded multilevel converter based on hybrid modulation of pam and pwm

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Embodiment Construction

[0030] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0031] This embodiment provides a modular cascaded multilevel converter based on hybrid modulation of PAM and PWM, such as figure 2 As shown, any bridge arm of the modular cascaded multilevel converter includes 2N HBM-type sub-modules and 2M FBM-type sub-modules, among which M FBM-type sub-modules (FBMU1~M) and N N HBM submodules (HBMD1~N) and M FBM submodules (FBMD1~M) are cascaded to form the lower bridge arm. N is much larger than M, N>4M.

[0032] 2N HBM-type sub-modules constitute a PAM modulation unit, each of which has two levels of +E and 0 (E is the voltage value of each c...

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Abstract

The invention relates to a modular cascaded multilevel converter based on PAM and PWM hybrid modulation, and any bridge arm of the modularized cascaded multilevel converter includes 2N HBM-type sub-modules and 2M FBM type submodules, wherein, M FBM type submodules and N HBM type submodules are cascaded to form an upper bridge arm, and N HBM type submodules and M FBM type submodules are cascaded to form a lower bridge arm; 2N HBM-type sub-modules form a PAM modulation unit, and the 2M FBM-type sub-modules form a PWM modulation unit. Compared with the prior art, the present invention adopts the mixed modulation method of PAM and PWM, which effectively reduces the system switching loss and output voltage and current harmonic distortion rate, improves the control accuracy and dynamic response speed of output parameters, and can solve the problem of HBM The problem of unbalanced sub-module DC side voltage and power output.

Description

technical field [0001] The invention relates to a modular cascaded multilevel converter, in particular to a modularized cascaded multilevel converter based on PAM and PWM mixed modulation. Background technique [0002] Modular multilevel converter (MMC) has been more and more widely used in high-voltage and large-capacity converters because of its advantages such as large power capacity, low switching frequency, small output harmonics and fast response. [0003] There are many topological structures of MMC, among which half-bridge sub-module (Half-Bridge-Module, HBM sub-module) cascaded MMC topology is widely used, and its structure is as follows figure 1 (1a) in , but its operation stability is limited due to its inability to handle short-circuit faults on the common DC side. In order to solve this problem, relevant scholars have proposed a full-bridge sub-module (Full-Bridge-Module, FBM sub-module) cascaded MMC topology, the structure of which is as follows figure 1 As s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/501
CPCH02M7/49H02M1/0077H02M7/5395H02M7/4835
Inventor 姚钢周荔丹
Owner 南京悦源电力研究院有限公司
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