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Grid side equivalent impedance modeling method and system

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

Active Publication Date: 2020-07-28
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 with reference to 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, for those skilled in the art, several changes and improvements can be made without departing from the inventive concept. 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] The step of aggregation equivalent: take the grid-connected admittance model of a single voltage source static var compensator as the minimum modeling unit, and aggregate and equalize the grid-connected admittance models of multiple voltage source static var compensators;

[0049] Steps for establishing the equivalent impedance model: Use the coupling and impedance relationship be...

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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, and in particular, to a grid-side equivalent impedance modeling method and system considering a voltage source type (VSC) static var compensator (STATCOM). Background technique [0002] With the increasing depletion of traditional energy sources such as coal, oil and natural gas, and the serious environmental problems caused, the promotion and utilization of renewable energy has become an important means to solve energy problems at this stage. my country has built a number of tens of millions of kilowatts of wind power / photovoltaic bases in the "Three Norths" area, and the use of UHV DC transmission is the dominant form of my country's current renewable energy development and utilization. The DC transmission system of the renewable energy power generation base includes diversified equipment such as wind and solar power generation, reactive power compensation, DC transmission,...

Claims

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Application Information

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Patent Type & Authority Patents(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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