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A Mean Modeling and Control Method Applicable to vsc-mtdc System

A technology of control method and average value model, which is applied in the direction of power transmission AC network, circuit device, AC network circuit, etc., to achieve the effect of speeding up the simulation speed, improving the simulation efficiency, and reducing the amount of mathematical calculation

Inactive Publication Date: 2019-05-24
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in HVDC technology, the average value model of the converter is not common, and there are few articles mentioning the application of the average value model of the converter in the multi-terminal DC transmission system

Method used

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  • A Mean Modeling and Control Method Applicable to vsc-mtdc System
  • A Mean Modeling and Control Method Applicable to vsc-mtdc System
  • A Mean Modeling and Control Method Applicable to vsc-mtdc System

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Embodiment

[0099] Application of mean modeling and methods for VSC-MTDC systems. Using the simulation software MATLAB / Simulink to build a 3-terminal DC transmission system, in which VSC3 is connected to the wind farm, the power fluctuations are relatively frequent, and digital simulation research is carried out to compare the dynamic response of the VSC detailed model and the average model. The simulation parameters are listed in Table 1 and Table 2. The response process of the system under the following working conditions is discussed, namely: (1) In normal working state, the active power of the VSC3 converter station changes abruptly; (2) A single-phase ground fault occurs in VSC1; (3) The DC fault occurs in the system.

[0100] Table 1 Simulation parameters

[0101]

[0102]

[0103] Table 2 Initial working status of the converter station

[0104]

[0105] (1) In normal working state, the active power of VSC3 converter station side changes suddenly;

[0106] Figures 9 to...

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Abstract

The invention provides an average value modeling and control method applicable to a VSC-MTDC (Voltage Sourced Converters Multi-terminal Direct Current) system. The method comprises the following steps of 1, building a mathematical model of a VSC based on d and q rotational coordinates, and calculating active power and reactive power of an AC side of a converter by combining a VSC-MTDC power transmission system; 2, building a VSC-MTDC controller by taking the active power and the reactive power of the AC side of the converter as reference values to achieve cooperative control of a plurality of converter stations; and 3, simplifying a control process of the VSC-MTDC, and building a VSC-MTDC average value model. The average value model can be applied to a multi-terminal direct current power transmission system, the simulation speed is greatly increased, the simulation efficiency is improved, and the mathematical calculation amount is reduced.

Description

technical field [0001] The present invention relates to the field of electrical engineering, in particular to an average value modeling and control method applicable to a VSC-MTDC (Voltage Sourced Converters Multi-terminal Direct Current, multi-terminal direct current transmission of voltage source converter) system. Background technique [0002] Compared with the traditional current source converter power transmission technology, the DC transmission system based on the voltage source converter can realize independent control of active power and reactive power, and can be applied to connect scattered small power plants and asynchronous operation systems, and build cities Various occasions such as DC transmission and distribution network and providing economical power to remote areas and isolated islands. At the same time, the modern VSC-HVDC (Voltage Source Converters-High Voltage Direct Current, DC transmission of voltage source converter) system has an integrated and modul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 江斌开王志新
Owner SHANGHAI JIAOTONG UNIV
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