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A Voltage Balance Control Method for Series Converter Valves in a Flexible DC Converter Station

A flexible DC and DC voltage technology, applied in the field of power transmission and distribution, can solve problems such as power imbalance and voltage imbalance, and achieve the effect of solving power imbalance problems

Active Publication Date: 2021-09-17
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a voltage balance control method for series converter valves in a flexible DC converter station, which can solve the power imbalance problem caused by voltage imbalance caused by multiple converter valve groups in a fixed power converter station

Method used

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  • A Voltage Balance Control Method for Series Converter Valves in a Flexible DC Converter Station
  • A Voltage Balance Control Method for Series Converter Valves in a Flexible DC Converter Station

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Embodiment Construction

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0020] The method described in the embodiment of the present invention is based on a two-terminal or multi-terminal DC power transmission system of a high-voltage large-capacity flexible converter, especially in the case of UHV. Scenario of constant power control. Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings, as figure 1 Shown is a schematic flowchart of a voltage bala...

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Abstract

The invention discloses a voltage balance control method for series converter valves of a flexible direct current converter station. Subtract the actual value of the DC voltage of the current converter valve group from the actual value of the DC voltage of the adjacent converter valve group to obtain the DC voltage deviation; then multiply the obtained DC voltage deviation by the DC current of the station Obtain the power unbalance amount; add the power unbalance amount to the original power command to generate a new power command value. The above method can solve the power imbalance problem caused by voltage imbalance caused by multiple converter valve groups in a constant power converter station.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution, in particular to a voltage balance control method for series converter valves of a flexible direct current converter station. Background technique [0002] In recent years, the Modular Multilevel Converter (MMC) technology based on modular multilevel converters has developed rapidly. Compared with two-level or three-level voltage source converters, it also has the advantages of modular structure, low switching frequency, and good harmonic characteristics. Therefore, MMC has become a The most promising topology in high-voltage and large-capacity flexible DC transmission projects. With the development of flexible DC systems towards high voltage, large capacity, and overhead lines, MMC converters are used as the basic converter valve group, and the use of multiple converter valve groups in series can effectively solve the problem of low voltage level of MMC single conver...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/26H02M7/00
CPCH02J3/26H02J3/36H02M7/00Y02E40/50Y02E60/60
Inventor 郭春义郑安然杨硕赵成勇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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