Direct-driven wind power plant dynamic equivalence method for subsynchronous oscillation analysis

A technology of subsynchronous oscillation and dynamic equivalent, which is 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 data

Active Publication Date: 2019-04-23
SOUTHWEST JIAOTONG UNIV
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  • Abstract
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Problems solved by technology

However, there are not many studies on the equivalent met

Method used

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  • Direct-driven wind power plant dynamic equivalence method for subsynchronous oscillation analysis
  • Direct-driven wind power plant dynamic equivalence method for subsynchronous oscillation analysis
  • Direct-driven wind power plant dynamic equivalence method 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 direct-driven wind power plant dynamic equivalence method for subsynchronous oscillation analysis. The method comprises the following steps of 1, distinguishing a subsynchronous oscillation mode of each fan according to the environmental excitation response data; 2, performing clustering according to the subsynchronous oscillation frequency to obtain a fan primary clustering result; 3, performing further classification through comparison on the primary clustering result obtained in the step 2 according to subsynchronous oscillation damping to obtain the fan final clustering result; 4, performing equivalence on the fan parameter in the final clustering result obtained in the step 3 according to a weighing equivalence method; 5, performing equivalence on the networkparameter in the final clustering result obtained in the step 3 according to the principle that the voltage loss before and after the equivalence is unchanged; 6, obtaining an equivalent model according to the equivalent result of the step 4 and the step 5, and performing subsynchronous oscillation analysis. According to the invention, the weak damping subsynchronous oscillation mode of a wind power plant is well reserved; the method is applicable to the direct-driven wind power plant subsynchronous oscillation analysis; the data can be easily obtained; the online application can be realized.

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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IPC IPC(8): H02J3/38H02J3/24G06F17/50
CPCH02J3/386H02J3/24G06F30/367H02J2203/20Y02E10/76
Inventor 王晓茹李龙源张航
Owner SOUTHWEST JIAOTONG UNIV
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