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Method for suppressing subsynchronous oscillation of doubly-fed wind power plant based on stator side analog resistor

A technology of subsynchronous oscillation and analog resistance, which is applied in motor generator control, electronic commutation motor control, control of electromechanical brakes, etc.

Active Publication Date: 2021-03-05
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the aspect of suppressing subsynchronous oscillations of doubly-fed wind farms, current research focuses on the use of additional damping controllers or FACTS devices. Although these methods have certain effects in suppressing oscillations, they usually require complicated parameter setting, and the suppression effect is affected by filtering. impact on device performance
In addition, the introduction of additional devices increases the cost of a single fan, which is not conducive to practical engineering applications

Method used

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  • Method for suppressing subsynchronous oscillation of doubly-fed wind power plant based on stator side analog resistor
  • Method for suppressing subsynchronous oscillation of doubly-fed wind power plant based on stator side analog resistor
  • Method for suppressing subsynchronous oscillation of doubly-fed wind power plant based on stator side analog resistor

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Embodiment

[0150] Under the Matlab platform, build as figure 2 In the system shown, the wind farm in the system is boosted by a transformer, and then connected to the infinite system through a series compensation line. The 100MW wind farm is composed of 50 2MW double-fed wind turbines. The specific system parameters As shown in Table 2 to Table 4:

[0151] Table 2 Induction Generator Parameters

[0152] name Stand-alone parameters total parameter base capacity 2MW 100MW baseline voltage 690V 690V Stator leakage reactance X ls

0.09231pu 0.09231pu Rotor leakage reactance X lr

0.09955pu 0.09955pu Stator and rotor mutual inductanceX M

3.95279pu 3.95279pu Stator resistance R s

0.00488pu 0.00488pu Rotor resistance R r

0.00549pu 0.00549pu Grid side smoothing reactance X tg

0.3pu 0.3pu DC capacitor reference voltage 1200V 1200V DC capacitance C 14000μF 50×14000μF

[0...

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Abstract

The invention discloses a method for suppressing subsynchronous oscillation of a doubly-fed wind power plant based on a stator side analog resistor. The method comprises the following steps: firstly,establishing a system model of the doubly-fed wind power plant with series compensation capacitor grid connection; secondly, deducing an equivalent impedance model of the doubly-fed fan grid-connectedsystem in combination with a control strategy of a rotor side converter, and analyzing damping characteristics of the system; determining the value of a stator side analog resistor according to the analysis result of the damping characteristic of the doubly-fed fan grid-connected system so as to compensate the negative damping effect of the system; and finally, applying a control strategy based on the stator side analog resistor to control of a doubly-fed fan stator side converter, and completing suppression of subsynchronous oscillation of the system. The subsynchronous oscillation phenomenon in the wind power plant grid-connected system can be effectively inhibited, the stability of the system is improved, any additional device is not needed, the cost is saved, and the practical engineering application is facilitated.

Description

technical field [0001] The invention belongs to the technical field of wind power generator stability control, in particular to a method for suppressing subsynchronous oscillation of a doubly-fed wind power field based on stator-side analog resistance. Background technique [0002] Among many renewable energy sources, wind energy has the characteristics of abundant resources and wide distribution, and has good economic and social benefits. China's energy development strategy has taken the large-scale development and utilization of wind power as an important part of it. Due to the inconsistent distribution of wind power resources and load demand, it is necessary to transmit wind power with large capacity and long distances. The series compensation capacitor technology has the advantages of reducing the loss of the transmission line and increasing the transmission capacity of the line at the same time. It can be used as a technical support for large-scale wind power transmiss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38H02P21/28
CPCH02J3/24H02P21/28Y02E10/76
Inventor 王宝华单碧涵蒋海峰饶新亮
Owner NANJING UNIV OF SCI & TECH
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