Online measurement method for generalized short-circuit ratio of multi-infeed new energy grid-connected system

A measurement method and multi-feed technology, applied in the field of electrical information, can solve the problem that generalized short circuit is more complicated than online monitoring, and achieve the effect of resisting noise interference

Active Publication Date: 2020-06-05
ZHEJIANG UNIV +1
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Problems solved by technology

However, due to the time-varying nature of power system operation and protection requirements, the grid stru

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  • Online measurement method for generalized short-circuit ratio of multi-infeed new energy grid-connected system
  • Online measurement method for generalized short-circuit ratio of multi-infeed new energy grid-connected system
  • Online measurement method for generalized short-circuit ratio of multi-infeed new energy grid-connected system

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Embodiment Construction

[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0035] According to the embodiment and its implementation process of the complete implementation of the inventive method are as follows:

[0036] Consider a wind farm with n wind turbines, such as figure 1 As shown, the current and voltage fed into the port node can be expressed as: and Denotes the i-th current fed into the port node, Indicates the voltage of the i-th feed-in port node, and j represents an imaginary number.

[0037] In this model, nodes 1~n represent n wind turbine feed-in port nodes; nodes n+1~n+m represent nodes in the wind farm that are not directly connected to wind turbines, which are called nodes in the network; the AC power grid is simplified as An infinite grid equivalent node ( figure 1 Infinite Bus).

[0038] According to the electrical network theory, the impedance between node i and node j can be expressed as: Z ij =R ...

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Abstract

The invention discloses an online measurement method for a generalized short-circuit ratio of a multi-infeed new energy grid-connected system. System nodes are divided into a feed-in port node, an intra-network node and an infinite power grid equivalent node, discrete time point data of current and voltage of the feed-in port node are acquired from the nodes, and then a current difference matrix and a voltage difference matrix are acquired; and a relation model between the current difference matrix and the voltage difference matrix is established through a rearranged Crocco order reduction admittance matrix, then a rearrangement matrix is solved according to a least square method matrix iterative solution, and the generalized short-circuit ratio is obtained by utilizing the rearrangement matrix. According to the generalized short-circuit ratio real-time measurement algorithm, real-time online measurement of the generalized short-circuit ratio can be achieved, and the calculation resulthas high resistance to measurement noise interference through the matrix iterative algorithm based on the least square method.

Description

technical field [0001] The invention relates to the field of electrical information technology, in particular to an online measurement method for the generalized short-circuit ratio of a multi-infeed new energy grid-connected system. Background technique [0002] With the massive integration of renewable energy generation such as photovoltaics and wind energy into the power system, various studies have been conducted on the grid-connected stability indicators of renewable energy generation at home and abroad. [0003] The generalized short-circuit ratio is one of the indicators that characterizes the relative strength and stability of the AC grid of the power electronics multi-infeed power system. According to the generalized short-circuit ratio theory, the stability margin of wind farms can be obtained only by paying attention to the grid strength and its corresponding boundaries. Therefore, understanding the generalized short-circuit ratio is helpful for the power system ...

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Application Information

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IPC IPC(8): G01R31/00G01R27/02
CPCG01R27/02G01R31/00
Inventor 辛焕海黄林彬王奕鑫鞠平朱承治蒙志全
Owner ZHEJIANG UNIV
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