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Capacitor static voltage balance control method and system for modular multilevel converter

A modular multi-level, static voltage technology, applied in the conversion of AC power input to DC power output, electrical components, output power conversion devices, etc., can solve problems such as efficiency reduction

Active Publication Date: 2021-05-14
TBEA XIAN ELECTRIC TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The object of the present invention is to provide a static voltage balance control method and system for modular multilevel converter capacitors, to solve the problem of using a power resistor with a suitable resistance in parallel with a module capacitor to suppress the capacitor voltage in the prior art Energy loss caused by divergence and technical problems of reduced efficiency

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  • Capacitor static voltage balance control method and system for modular multilevel converter
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  • Capacitor static voltage balance control method and system for modular multilevel converter

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Embodiment 1

[0051] In order to overcome the deficiencies in the prior art, the present invention proposes a static voltage balance control method for modular multilevel converter capacitors based on the automatic adjustment of the input characteristics of the energy harvesting power supply. By analyzing the factors affecting the unbalanced voltage of the module capacitors, Establish a mathematical model between the static voltage of the power module capacitor and the input current of the energy harvesting power supply. According to the mathematical model expression, this method can control the input current of the power supply through the self-adjustment of the input characteristics of the energy harvesting power supply, thereby indirectly controlling the static state of the module capacitor. voltage balance.

[0052] The self-adjusting signal of the input characteristics of the energy-taking power supply is generated by the comparator circuit and the 555 oscillator circuit of the energy-t...

Embodiment 2

[0141] The present invention also provides a modularized multilevel converter capacitor static voltage balance control system, including

[0142] An acquisition module, configured to acquire the capacitor voltage u of the power module k ck ;

[0143] Judgment module, used to judge the capacitor voltage threshold u when the input characteristics of the energy harvesting power supply are self-adjusted q and capacitor voltage u ck Relationship;

[0144] The adjustment module is used to self-adjust the signal d through the input characteristic of the self-energy-capturing power supply according to the judgment result psk Adjusting and controlling the input characteristics of the energy harvesting power supply of the power module k indirectly changes the static voltage of the capacitor of the power module of the modular multilevel converter.

[0145] Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or ...

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Abstract

The invention provides a capacitor static voltage balance control method and system for a modular multilevel converter. The capacitor static voltage balance control method comprises the following steps of: acquiring a capacitor voltage uck of a power module k; judging a relation between a capacitor voltage threshold value uq and the capacitor voltage uck when the input characteristics of an energy-taking power supply are self-adjusted; and adjusting and controlling the input characteristics of the energy-taking power supply of the power module k through using a self-energy-taking power supply input characteristic self-adjusting signal dpsk according to the judgment result, and indirectly changing the capacitor static voltage of the power module of the modular multilevel converter. By automatically adjusting the input characteristics of the energy-taking power supply, the capacitor static voltage of the power module of the modular multilevel converter is indirectly changed, and the technical problems of energy loss and efficiency reduction caused by the fact that a power resistor with a proper resistance value is adopted to be connected with the module capacitor in parallel to restrain capacitor voltage divergence in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of flexible direct current transmission, and in particular relates to a static voltage balance control method and system for a modularized multilevel converter capacitor. Background technique [0002] With the development of high-power power electronics technology, full-control power electronic devices are more and more widely used in DC transmission systems. The successful use of it has further promoted the development of power transmission and distribution technology in China. [0003] At present, there are mainly three topologies that constitute voltage source converters: two-level topology, clamp diode three-level topology, and modular multilevel topology. Among them, the converter (MMC) composed of modular multi-level topology has been widely used in high-power wind power generation, solar power generation, island power supply, offshore power supply and other DC transmission due to its advantages of lo...

Claims

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Application Information

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IPC IPC(8): H02M7/487
CPCH02M7/487Y02E60/60
Inventor 雒龙飞郝翔黄浪赵亮亮郭博宁
Owner TBEA XIAN ELECTRIC TECH
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