Multi-terminal flexible direct current system droop coefficient optimization method based on small signal modeling

A multi-terminal flexible, DC system technology, applied in AC network circuits, power transmission AC networks, electrical components, etc., can solve the problems of lack of effective analysis methods, insufficient attention to small disturbance analysis, and shorten the adjustment time.

Active Publication Date: 2019-07-16
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, insufficient attention has been paid to the small disturbance analysis of the multi-terminal DC interconnection system, and an effective analysis method for selecting the droop coefficient is lacking

Method used

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  • Multi-terminal flexible direct current system droop coefficient optimization method based on small signal modeling
  • Multi-terminal flexible direct current system droop coefficient optimization method based on small signal modeling
  • Multi-terminal flexible direct current system droop coefficient optimization method based on small signal modeling

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0054] Step 1: Determine the system structure

[0055] Divide the multi-terminal system into several subsystems for modeling, which can be divided into several parts: sending-end converter station, receiving-end converter station and DC network;

[0056] Step 2: Model the sending end converter station

[0057] Measure the three-phase voltage and current at the point of common coupling (PCC), according to Kirchhoff's law, the differential equation under the dq axis is

[0058]

[0059]

[0060]

[0061] where L c is the total equivalent inductance of the AC side; R c is the total equivalent resistance of the AC side; C is the inter-electrode capacitance of the VSC DC side; ω is the grid angular frequency; V sdi and V sdi is the dq axis voltage component at PCC, i di i qi is the dq axis current component at PCC; V cdi and V cqi is the dq axis voltage component of VSC AC side; I dci is the current on the DC line; i is the number of the converter station.

[006...

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Abstract

The invention relates to a multi-terminal flexible direct current system droop coefficient optimization method based on small signal modeling. The method comprises the steps of 1, determining a systemstructure; 2, modeling a transmitting terminal converter station; 3, modeling a receiving terminal converter station; 4, modeling a direct current network; 5, carrying out small signal model operation to obtain a state matrix A of a full system model, and calculating an eigenvalue lambda; 6, analyzing small signal parameters; and 7, carrying out optimization selection on the parameters.

Description

technical field [0001] The invention relates to a small signal modeling analysis method, in particular to a flow method suitable for small signal stability analysis of a multi-terminal flexible direct current (VSC-MTDC) power transmission system. Background technique [0002] The development of a new generation of flexible DC transmission technology is becoming more and more mature, and its ability to independently adjust power and operate flexibly has injected new vitality into HVDC transmission technology. The multi-terminal flexible DC transmission system includes the rectification side, the inverter side and the DC transmission line. The master-slave control and droop control are often used to achieve power balance between multiple converter stations. [0003] The control goal of interconnection of multiple converter stations is to maintain the DC voltage stability and power balance of the system on the basis of ensuring the safe and stable operation of the converter sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2003/365H02J2203/20Y02E60/60
Inventor 车延博贾晶晶吕子含李明
Owner TIANJIN UNIV
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