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Capacitor voltage sorting frequency optimization control method and system of converter

A capacitor voltage sorting and capacitor voltage technology, applied in the field of power transmission and distribution, can solve problems such as excessive resource consumption, and achieve the effect of solving excessive resource consumption, reducing switching frequency, and simple implementation.

Active Publication Date: 2018-01-19
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Abstract
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Problems solved by technology

[0006] Based on this, it is necessary to provide an optimal control method and system for the capacitor voltage sorting frequency of the inverter to solve the problem of excessive resource consumption in the traditional way of reducing the switching frequency of the inverter

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  • Capacitor voltage sorting frequency optimization control method and system of converter
  • Capacitor voltage sorting frequency optimization control method and system of converter
  • Capacitor voltage sorting frequency optimization control method and system of converter

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and do not limit the protection scope of the present invention.

[0024] see figure 1 As shown in FIG. 1 , it is a schematic flowchart of an optimal control method for the capacitor voltage sorting frequency of the converter according to an embodiment of the present invention. The optimal control method of the capacitor voltage sorting frequency of the converter in this embodiment includes the following steps:

[0025] Step S110: Obtain the system parameters of the inverter, and obtain the maximum increment of the sub-modules of the inverter within the capacitor voltage update cycle according to the system parameters;

[0026] In thi...

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Abstract

The invention relates to a capacitor voltage sorting frequency optimization control method and system of a converter. The optimization control method comprises the steps of obtaining system parametersof the converter, operating parameters of the converter, and preset converter sub module capacitor voltage fluctuation percentage; obtaining the maximum increment of the sub module of the converter in a capacitor voltage updating period according to the system parameters; and obtaining the capacitor voltage sorting frequency of the converter according to the operating parameters, the preset converter sub module capacitor voltage fluctuation percentage and the maximum increment. In the scheme, the sorting frequency is obtained under the premise of satisfying the preset converter sub module capacitor voltage fluctuation percentage, so that it is ensured that the safety and reliability of the converter are not influenced; in addition, the minimum sorting frequency can be obtained under the maximum capacitor voltage increment; when the sorting frequency is applied to a capacitor voltage sorting algorithm, the switching frequency of a switching device can be lowered; and in addition, the implementation mode is simple, and the problem of overhigh resource consumption of the switching frequency of the converter can be solved.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution, in particular to a method and system for optimally controlling the capacitor voltage sorting frequency of a converter. Background technique [0002] The converter is an important device in the field of power transmission and distribution technology. It is very important for the power transmission and distribution technology to reduce the switching loss of the converter and improve the reliability of the converter operation. [0003] In recent years, Modular Multilevel Converter (MMC) has become a flexible The converter topology of choice for DC transmission systems has achieved widespread use worldwide. MMC has developed rapidly from the initial low-voltage, small-capacity demonstration project to high-voltage, large-capacity, multi-terminal system, showing a good development prospect. [0004] During the operation of a modular multilevel converter, the switching los...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00
Inventor 熊岩朱喆许树楷
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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