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Electromagnetic transient mathematical model of distributed power-flow controller based on MMC, control system and modeling method

A power flow controller, electromagnetic transient technology, applied to AC network circuits, AC networks with different sources of the same frequency, circuit devices, etc., can solve the problems of increasing AC transmission costs, increasing losses, and not being able to meet different voltage levels, etc.

Active Publication Date: 2017-06-30
WUHAN UNIV OF TECH +3
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Problems solved by technology

[0003] Traditional DPFC adopts two-level or three-level voltage source converter topology, which cannot meet the needs of different voltage levels. On the one hand, it increases the cost of AC transmission, on the other hand, it also increases losses, and occupies a large area. inflexible control

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  • Electromagnetic transient mathematical model of distributed power-flow controller based on MMC, control system and modeling method
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  • Electromagnetic transient mathematical model of distributed power-flow controller based on MMC, control system and modeling method

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Embodiment Construction

[0070] The principles and features of the present invention will be further described below in conjunction with the accompanying drawings.

[0071] The modeling method of the control system of the electromagnetic transient mathematical model based on the MMC distributed power flow controller described in the embodiment of the present invention includes the following specific steps:

[0072] S1. Use the PSCAD / EMTDC simulation platform to build a simulation model of the double-circuit power transmission system, and set the voltage at the transmission terminal as The receiving terminal voltage is The total impedance of the two transmission lines (Line 1 and Line 2) is XL1 and XL2 respectively, the Y-△ transformer at the power transmitting end (head end) is Ts, and the Y-△ transformer at the power receiving end (end) is Tr, as figure 1 shown;

[0073] The parameters of each component on the given transmission system line are as follows:

[0074] The equivalent impedance of th...

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Abstract

The invention discloses an electromagnetic transient mathematical model of a distributed power-flow controller based on an MMC, control system and a modeling method. The distributed power-flow controller comprises a parallel connection side converter composed of a three-phase converter based on the MMC at the parallel connection side and a parallel connection side single-phase converter and a series connection side converter composed of multiple sets of series connection side single-phase converter; the electromagnetic transient mathematical model mainly comprises a parallel connection side converter model and a series connection side converter model; the control system comprises a parallel connection side control model and a series connection side control model, the parallel connection side control model comprises a three-phase converter control module based on the MMC at the parallel connection side and a parallel connection side single-phase converter module, and the series connection side control model comprises a series connection side third harmonic control module and a series connection converter active power reactive power control module. The electromagnetic transient mathematical model is designed by adopting modularization, the sub module switch-on and switch-off frequency is lowered, and the loss is lowered; the control system adapts to different voltage grades, and is applicable to flexible alternating current transmission occasions.

Description

technical field [0001] The invention relates to the field of simulation modeling of a distributed power flow controller (DPFC) after topology optimization, in particular to an electromagnetic transient mathematical model, a control system and a modeling method of a distributed power flow controller based on MMC. Background technique [0002] With the development of the power system towards a strong and intelligent large power grid, the flexible AC transmission system (FACTS) based on power electronic converters has attracted more and more attention from researchers. Distributed power flow controller (DPFC), as a powerful and most flexible FACTS device for regulating system power flow, has been extensively studied. [0003] Traditional DPFC adopts two-level or three-level voltage source converter topology, which cannot meet the needs of different voltage levels. On the one hand, it increases the cost of AC transmission, on the other hand, it also increases losses, and occupie...

Claims

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Application Information

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IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 唐爱红万家乐邵云露舒欣黄涌郑旭赵红生徐秋实王冲高梦露王少荣刘涤尘
Owner WUHAN UNIV OF TECH
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