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Long-line wind farm grid-connected resonance information extraction method

A technology for information extraction and wind farms, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as inability to evaluate resonance conditions, complex resonance of the system, and less consideration of long-line distributed parameter models

Inactive Publication Date: 2016-06-15
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Problems solved by technology

However, the distributed parameter model of long lines is rarely considered in the modeling of inverter grid connection
At the same time, the distributed capacitance of the long transmission line to the ground may cause complex resonance phenomena in the system, which in turn affects the impedance value of the grid-connected resonance point
[0004] Methods for analyzing harmonic resonance include the frequency sweep method, but this method can accurately identify the resonance frequency but cannot evaluate the resonance condition

Method used

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  • Long-line wind farm grid-connected resonance information extraction method
  • Long-line wind farm grid-connected resonance information extraction method
  • Long-line wind farm grid-connected resonance information extraction method

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Embodiment Construction

[0046] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0047] The embodiment of the present invention provides a method for extracting wind farm grid-connected resonance information of a long line, which can accurately analyze the wind farm grid-connected resonance phenomenon considering the distribution parameter model of the long line, and the steps included are as follows: figure 1 Shown:

[0048] Step 1. Establish the grid-connected equivalent model of the wind farm including the grid-connected equivalent output impedance model of the inverter and the distributed parameter model of the long transmission line.

[0049] (1) Establish the...

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Abstract

The invention relates to a method for extracting resonance information of a long-line wind farm grid connection, comprising the following steps: 1) establishing an equivalent model of a wind farm grid connection; 2) obtaining the wind farm grid connection system according to the wind farm grid connection equivalent model Nodal admittance matrix; 3) decompose said nodal admittance matrix into expressions about eigenvalues: Y f = LΛT; 4) According to step 3), the resonance participation factor of each node and the resonance sensitivity value of each electrical component are obtained when the long-line wind farm grid-connected resonance phenomenon occurs. Compared with the prior art, the present invention is based on the equivalent model of wind farm grid connection, and uses modal analysis method to analyze the resonance participation factors of each node of the system and the modal sensitivity of components, thereby giving detailed wind power grid connection resonance information, providing wind power It provides theoretical guidance for field construction planning, and has the advantages of accurate and reliable information extraction results.

Description

technical field [0001] The invention relates to the technical field of multi-inverter grid-connected harmonic interaction analysis, in particular to a method for extracting long-line wind farm grid-connected resonance information. Background technique [0002] In recent years, due to the increasing scale of wind farm development and the rapid development of wind power grid-connected technology, the power quality problems caused by wind power grid-connected have become a severe challenge for the current power system. For wind farms with long lines, due to the weak structure of the grid-connected system and the long outgoing lines, the impact of transformer leakage inductance, line reactance and distributed capacitance cannot be ignored. [0003] At present, domestic and foreign researches on distributed power grid-connected resonance problems mainly focus on: 1. Design and control of inverter LCL filter; 2. Harmonic interaction and modeling of multi-inverter grid-connected, e...

Claims

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Application Information

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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 张鹏陈甜甜潘爱强罗祾金家培
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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