Method for additional function control for modularized multilevel current converter

A modular multi-level and control method technology, which is applied in the direction of converting AC power input to DC power output, electrical components, active power filtering, etc. Harmonic pollution of the system, increase of additional investment and other problems, to achieve the effect of reducing harmonic pollution, good economy and improving power quality

Inactive Publication Date: 2014-04-16
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Application Information

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Problems solved by technology

[0003] When harmonic source loads such as rolling mills are powered by AC and modular multi-level flexible DC transmission dual power supplies, the harmonics generated by itself will not only cause harm

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  • Method for additional function control for modularized multilevel current converter
  • Method for additional function control for modularized multilevel current converter
  • Method for additional function control for modularized multilevel current converter

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Embodiment Construction

[0028] The technical solution of the invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] An additional function control method for a modular multilevel converter according to the present invention, the modular multilevel converter is one or more converter stations in a flexible direct current transmission system, so The additional function described above is to enable the modular multilevel converter to have the function of an active filter while transmitting active power and reactive power through a certain control method.

[0030] In the present invention, taking a rolling mill as a harmonic source load and adopting two-end modular multi-level flexible DC transmission as an example, the inventive method is described in detail. When the rolling mill adopts AC and modular multi-level flexible DC transmission dual power supply, the power grid structure is as follows figure 1 shown. The rolling mill takes...

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Abstract

The invention discloses a method for additional function control for a modularized multilevel current converter. The method comprises the steps that alternating voltages and alternating currents at the load side are collected; based on the instantaneous power theory, a harmonic current instantaneous value at the load side is calculated; a harmonic current instantaneous calculation value is adjusted by a closed loop so that an additional control voltage order can be obtained; the additional control voltage order and the power control voltage order are added together to serve as a voltage control order of the modularized multilevel current converter; alternating voltages and alternating currents at the load side are collected again. Under the condition that a filter device is not additionally arranged, harmonic pollution, caused by a harmonic source, of a connected alternating current system is effectively reduced, the power grid power quality is improved, and the stability and the quality of the system are improved.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to the control technology of a modular multilevel converter. Background technique [0002] With the development of society, the existing grid structure can no longer meet the needs of economic growth, and there is an urgent need to upgrade the existing AC grid. Flexible DC transmission will play an increasingly important role in the interconnection of regional grids and the power transmission of city center loads due to its independent adjustment of active and reactive power, passive power supply capabilities, and easy construction of DC grids. In addition, flexible direct current transmission adopts buried direct current cables, without alternating electromagnetic fields and oil pollution, and can complete the expansion and transformation of urban power grids without electromagnetic interference and without affecting the city's appearance, so as to meet the ne...

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Application Information

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IPC IPC(8): H02J3/01H02M7/483
CPCY02E40/20Y02E40/40
Inventor 饶宏陈名许树楷岳伟易荣翁海清刘小勇冯其塔张海涛
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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