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A Dynamic Equivalence Method for Direct Drive Wind Farms for Subsynchronous Oscillation Analysis

A subsynchronous oscillation and dynamic equivalent technology, applied in the value field, can solve the problem that there are not many equivalent methods for subsynchronous oscillation analysis, and achieve the effect of easy acquisition

Active Publication Date: 2022-04-29
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are not many studies on the equivalent method applied to the analysis of subsynchronous oscillations

Method used

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  • A Dynamic Equivalence Method for Direct Drive Wind Farms for Subsynchronous Oscillation Analysis
  • A Dynamic Equivalence Method for Direct Drive Wind Farms for Subsynchronous Oscillation Analysis
  • A Dynamic Equivalence Method for Direct Drive Wind Farms for Subsynchronous Oscillation Analysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] Small Disturbance Model Calculations

[0094] There are 66 direct-drive wind turbines in the wind farm (the rated power is 1.5MW, and the wind turbine model is as follows figure 2 shown); taking into account the wind farm collector line, connected to the infinite power supply through the wind farm step-up transformer and transmission line; because the current electromagnetic transient simulation software (such as PSCAD, etc.) is difficult to carry out the electromagnetic transient of such a large-scale wind farm simulation. Therefore, all the simulations in this embodiment are based on the small disturbance model of the wind farm and calculated on MATLAB. In this embodiment, the wind farm adopts a small disturbance model, in which wind turbines, lines, ground capacitance, etc. are taken into account, and the obtained system state matrix (ie, A matrix) has a total of 812 orders.

[0095] First, apply environmental excitation to the fan to obtain the response of the fa...

Embodiment 2

[0101] Electromagnetic Transient Model Calculations

[0102] In embodiment 1, due to the large scale, it can only be studied by establishing a small disturbance model. In this embodiment, an electromagnetic transient model of a small-scale wind farm is established for illustration.

[0103] A simple wind farm model is established on PSCAD. Due to the limitation of the simulation software scale, the wind farm contains 4 wind turbines (rated power is 1.5MW, and the wind farm model is as follows figure 2 shown), the connection method is as follows Figure 5 As shown, it is connected to an infinite bus through a line.

[0104] In the electromagnetic transient simulation of the wind farm, the response of each wind turbine under the environmental excitation is obtained; the environmental excitation form is the same as that of Embodiment 1. Select the active power output data of each fan, and use the RDT and TLS-ESPRIT algorithm to identify the oscillation mode of each fan. The RD...

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Abstract

The invention discloses a dynamic equivalent method for a direct-drive wind farm for subsynchronous oscillation analysis. Frequency clustering to obtain the preliminary grouping results of wind turbines; Step 3: According to the subsynchronous oscillation damping comparison, the preliminary grouping results obtained in Step 2 are further classified to obtain the final grouping results of wind turbines; Step 4: According to the weighted equivalent method, the final grouping results obtained in Step 3 The fan parameters in the result are equivalent; step 5: according to the principle of constant voltage loss before and after the equivalent, the network parameters in the final grouping result obtained in step 3 are equivalent; step 6: according to the equivalent of step 4 and step 5 As a result, an equivalent model is obtained for subsynchronous oscillation analysis; the invention can better preserve the weakly damped subsynchronous oscillation mode of the wind farm, and is suitable for direct drive wind farm subsynchronous oscillation analysis. The data is easy to obtain and can be applied online.

Description

technical field [0001] The invention relates to a wind farm equivalent method, in particular to a direct-drive wind farm dynamic equivalent method for subsynchronous oscillation analysis. Background technique [0002] In recent years, with the rapid development of wind power, the scale of installed capacity has continued to increase, and subsequently, the problem of sub-synchronous oscillation (SSO) of wind power has become increasingly prominent, and accidents have occurred frequently; in October 2009, Texas, USA A double-fed wind farm in Sizhou experienced subsynchronous oscillation with an oscillation frequency of about 20Hz; in December 2012, a double-fed wind farm in North China experienced subsynchronous oscillation with an oscillation frequency of about 6-8Hz, which was also the first time in China Subsynchronous oscillation of wind power occurred; in July 2015, subsynchronous oscillation occurred in a large direct-drive wind farm in a certain area of ​​Xinjiang, Chin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/24G06F30/20G06K9/62
CPCH02J3/386H02J3/24G06F30/367H02J2203/20Y02E10/76
Inventor 王晓茹李龙源张航
Owner SOUTHWEST JIAOTONG UNIV
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