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Fuzzy control method for double-fed electric field subsynchronous oscillation inhibition

A sub-synchronous oscillation and fuzzy control technology, applied in the field of wind turbine control, achieves the effects of wide application range, good suppression effect, and good engineering application prospects

Active Publication Date: 2016-10-26
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in the prior art, there is no method to replace the traditional PI control with adaptive fuzzy control to suppress the subsynchronous oscillation of the DFIG wind farm.

Method used

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  • Fuzzy control method for double-fed electric field subsynchronous oscillation inhibition
  • Fuzzy control method for double-fed electric field subsynchronous oscillation inhibition
  • Fuzzy control method for double-fed electric field subsynchronous oscillation inhibition

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Embodiment

[0148] With MATLAB as the platform, build such as figure 1 In the system shown, the 100MW wind farm in the system is boosted by a 690V / 161kV transformer, and then connected to the infinite system through a series compensation line. Among them, the 100MW wind farm is composed of 50 2MW double-fed wind turbines. The dynamic behavior of a combined large-scale wind farm can be represented by the equivalent model in the stand-alone DFIG. The specific system parameters are shown in the table below.

[0149] Table 5 Parameters of doubly-fed induction wind turbine

[0150] base capacity

2MW

100MW

baseline voltage

690V

690V

X ls

0.09231pu

0.09231pu

X lr

0.09955pu

0.09955pu

X M

3.95279pu

3.95279pu

R s

0.00488

0.00488

R r

0.00549

0.00549

X tg

0.3pu(0.189mH)

0.3pu(0.189 / 50mH)

DC capacitor reference voltage

1200V

1200V

DC capacitive reactance

14000μF...

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Abstract

The present invention discloses a fuzzy control method for double-fed electric field subsynchronous oscillation inhibition. The method concretely comprises the following steps: 1, establishing an aerodynamic model, a shafting model, a double-fed induction motor model, a rotor side and net-side convertor control module, a direct current capacitor dynamic process model and a serial compensation line model; 2, allowing the magnetic torque Te control outer shroud of a double-fed fan rotor side convertor to employ fuzzy control taking replacing of a traditional PI control method, taking an electromagnetic torque error E and an error variation EC as an input variation, and taking the variation DU of the control amount as an output amount to design a fuzzy controller; 3, adding a self-adjusting module, and constructing the fuzzy controller capable of parameter online self adjusting; and 4, employing the fuzzy controller to control the double-fed electric field subsynchronous oscillation, and completing the inhibition of the double-fed electric field subsynchronous oscillation. The method is reasonable and reliable, and the applied fuzzy controller has better inhibition effect on the subsynchronous oscillation and has better engineering application prospect.

Description

technical field [0001] The invention belongs to the technical field of wind turbine control, in particular to a fuzzy control method for subsynchronous oscillation suppression caused by series compensation and grid connection of a wind farm containing a doubly-fed fan DFIG (Doubly-Fed Induction Generator). Background technique [0002] 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. It can be used as a technical support for the large-scale transmission of wind power. However, the application of this technology may also induce the subsynchronous oscillation of the wind farm. Th...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02J3/38
CPCH02J3/386H02P21/001Y02E10/76
Inventor 王宝华单馨仲振洪珊杨加意
Owner NANJING UNIV OF SCI & TECH
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