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Grid-side equivalent impedance modeling method and system

A technology of equivalent impedance and modeling method, which is applied in the field of AC power transmission and distribution to achieve the effect of correcting impedance characteristics

Active Publication Date: 2019-03-19
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of various equipment control methods, complex network architecture, and dynamic interaction between equipment, the traditional grid-side impedance equivalent model urgently needs to be improved.

Method used

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  • Grid-side equivalent impedance modeling method and system
  • Grid-side equivalent impedance modeling method and system
  • Grid-side equivalent impedance modeling method and system

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Embodiment Construction

[0046] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0047] like figure 2 As shown, a grid-side equivalent impedance modeling method provided by the present invention includes:

[0048] Aggregation equivalent step: take the grid-connected admittance model of a single voltage source static var compensator as the minimum modeling unit, and aggregate and equivalent the grid-connected admittance models of multiple voltage source static var compensators;

[0049] Equivalent impedance model establishment steps: use the coupling and impedance relationship betwee...

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Abstract

The invention provides a grid-side equivalent impedance modeling method and system. The method comprises an aggregation equivalent step of using a grid-connected admittance model of a single VAC STATCOM as a minimum modeling unit, and subjecting the grid-connected admittance models of multiple VAC STATCOMs to aggregation equivalence; and an equivalent impedance model establishment step of establishing a grid-side equivalent impedance model having operation of multiple VAC STATCOMs by using a coupling and impedance relationship between the grid-connected admittance model of the VAC STATCOM anda line admittance model. The method establishes an accurate and highly linear admittance model, verifies theoretically the validity of multiple VSC STATCOM grid-connected admittance models. The grid-side equivalent impedance obtained by a numerical relationship between admittance and impedance and in consideration of the operation of multiple VSC STATCOMs corrects the impedance characteristic of an existing line model, and contributes to providing an impedance reference for the stability of the new energy grid connection.

Description

technical field [0001] The invention relates to the field of AC power transmission and distribution, in particular to a grid-side equivalent impedance modeling method and system considering a voltage source (VSC) static var compensator (STATCOM). Background technique [0002] With the depletion of traditional energy sources such as coal, oil, and natural gas, and the serious environmental problems caused by them, the promotion, development and utilization of renewable energy has become an important means to solve energy problems at this stage. my country has built many 10-million-kilowatt-level wind power / photovoltaic bases in the "Three Norths" region, and uses UHV DC transmission as the leading form of my country's current renewable energy development and utilization. The DC external transmission system of the renewable energy power generation base includes diversified equipment such as wind power generation, reactive power compensation, DC transmission, and synchronous ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20Y02E40/10
Inventor 朱淼徐莉婷侯川川蔡旭
Owner SHANGHAI JIAO TONG UNIV
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