Unlock instant, AI-driven research and patent intelligence for your innovation.

Auxiliary capacitor centralized full-bridge mmc self-balancing topology based on inequality constraints

An auxiliary capacitor and equation-constrained technology, applied in the field of flexible power transmission, can solve the problems of large renovation costs, destroying the modularity of sub-modules, and failing to make full use of the existing structure of MMC.

Active Publication Date: 2018-10-30
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the design of this scheme destroys the modular characteristics of the sub-modules to a certain extent, and the capacitive energy exchange channel of the sub-modules is also limited to the phase, which fails to make full use of the existing structure of the MMC, and the introduction of three transformers complicates the control strategy. At the same time, it will also bring a large transformation cost

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Auxiliary capacitor centralized full-bridge mmc self-balancing topology based on inequality constraints
  • Auxiliary capacitor centralized full-bridge mmc self-balancing topology based on inequality constraints
  • Auxiliary capacitor centralized full-bridge mmc self-balancing topology based on inequality constraints

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] In order to further illustrate the performance and working principle of the present invention, the composition and working principle of the invention will be described in detail below in conjunction with the accompanying drawings. However, the full-bridge MMC self-equalizing topology based on this principle is not limited to figure 2 .

[0015] refer to figure 2 , Auxiliary capacitor centralized full-bridge MMC self-balancing topology based on inequality constraints, including a full-bridge MMC model composed of three phases A, B, and C. Each bridge arm of the three phases A, B, and C is respectively composed of N A full-bridge sub-module and a bridge arm reactor are connected in series, including 6 N IGBT modules, 6 N + 7 clamping diodes, 4 auxiliary capacitors, and 2 auxiliary IGBT modules are composed of a self-leveling auxiliary circuit.

[0016] In the full-bridge MMC model, the first submodule of the upper bridge arm of phase A, the midpoint of one IGBT modu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides an auxiliary capacitor centralized full-bridge MMC self-voltage-sharing topology based on inequality constraints. The full-bridge MMC self-voltage-sharing topology is built by combining a full-bridge MMC model and a self-voltage-sharing auxiliary loop which are electrically connected through 6N IGBT modules in the auxiliary loop. When the IGBT modules are triggered, the full-bridge MMC model and the self-voltage-sharing auxiliary loop form the auxiliary capacitor centralized full-bridge MMC self-voltage-sharing topology based on the inequality constraints; when the IGBT modules are locked, the topology is equivalent to a full-bridge MMC topology. The full-bridge MMC self-voltage-sharing topology can clamp direct current side faults, does not depend on special voltage-sharing control, can spontaneously achieve capacitor voltage balance of submodules on the basis of completing alternating current and direct current energy conversion, and meanwhile can correspondingly reduce the trigger frequency and capacitance value of the submodules to achieve full-bridge MMC base frequency modulation.

Description

technical field [0001] The invention relates to the field of flexible power transmission, in particular to an auxiliary capacitor centralized full-bridge MMC self-balancing topology based on inequality constraints. Background technique [0002] Modular multilevel converter (MMC) is the development direction of DC transmission technology in the future. MMC uses sub-module (SM) cascading to construct converter valves, which avoids the direct series connection of a large number of devices and reduces the impact on devices. Consistency requirements, while easy to expand and redundant configuration. As the number of levels increases, the output waveform is close to sinusoidal, which can effectively avoid the defects of low-level VSC-HVDC. [0003] The full-bridge MMC is composed of full-bridge sub-modules. The full-bridge sub-module is composed of four IGBT modules, a sub-module capacitor and a mechanical switch. It operates flexibly and has DC fault clamping capability. [000...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/5387
CPCH02M7/483H02M7/5387
Inventor 赵成勇许建中刘航
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)