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A step-down bang-bang control method for double-fed fan DC bus voltage

A DC bus voltage, doubly-fed fan technology, applied in the direction of reducing/preventing power oscillation, single-grid parallel feeding arrangement, etc., can solve the problems such as the inability to fully exploit the maximum control energy of the converter, neglecting the current dynamics, etc. difficulty, gain control voltage, effect of high control voltage

Active Publication Date: 2021-05-14
STATE GRID SICHUAN ECONOMIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the existing vector control cannot fully explore the maximum control energy of the converter and to improve the traditional switch control method, and to design a double-fed fan DC bus voltage step-down for the double-fed induction wind power generator system Bang-bang control (bang-bang control) method, the present invention ignores current dynamics during design, thereby realizes with first-order bang-bang controller (bang-bang controller) control has the direct-current link voltage of second-order dynamics, with Exerting the Maximum Control Potential of Grid-side Converter of DFIG

Method used

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  • A step-down bang-bang control method for double-fed fan DC bus voltage
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  • A step-down bang-bang control method for double-fed fan DC bus voltage

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Embodiment 1

[0043] This embodiment proposes a step-down bang-bang control method for double-fed wind turbine DC bus voltage. The bang-bang control (bang-bang control) method ignores the current dynamics during design, so as to realize the first-order bang-bang control A controller (bang-bang controller) controls the target of the DC-link voltage with second-order dynamics. When the absolute value of the DC bus voltage deviation of the wind turbine exceeds the preset threshold, the bang-bang controller is triggered, and the bang-bang controller outputs a binary switch control signal, which makes the grid-side converter of the wind turbine output a positive maximum voltage and negative maximum voltage to maximize the control potential of the converter. When the DC bus voltage of the wind turbine returns to near the balance point and maintains for a period of time, the bang-bang controller stops running, and the conventional vector controller is triggered to stabilize the DC bus voltage at t...

Embodiment 2

[0067] In this embodiment, a simulation experiment is carried out on the control method proposed in the above-mentioned embodiment 1 to test the performance of the reduced-order bang-bang control (bang-bang control) method. The control system is implemented with dSPACE.

[0068] The parameters of the reduced-order bang-bang controller in DFIG are: S n =2.2MVA (Rated MVA), R g 0.0015Ω, L g =120×10 -6 H, C=110F, and w s = 314.16 rad / s. The parameters of the vector controller are: P 1=0.3, I 1 =10,P 2 = 1, I 2 =10,P 3 =0.3, I 3 =10. The parameter selection of the reduced-order bang-bang controller is: e + = 0.05 p.u., e - =-0.05p.u., U + = 3 p.u., U - =-2p.u., τ=0.32s.

[0069] The external grid is modeled with a three-phase ideal voltage source connected in series with the R-R / / L (resistor connected in series with a branch consisting of a resistor connected in parallel with an inductor) branch. The series resistance is 31.4Ω, and the parallel resistance is 1.0...

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Abstract

The invention discloses a method for controlling step-down bang-boom of the DC bus bar voltage of a double-fed fan. A reduced-order bang-bang controller controls and outputs a control signal v dg1 The converter on the grid side of the wind turbine; when the absolute value of the DC bus voltage deviation e(t) of the double-fed wind turbine is less than the preset lower threshold e And after a period of time, trigger the conventional vector controller to control and output the control signal v dg2 For the grid-side converter of the wind turbine, the step-down thump-thump controller stops running. The present invention ignores the current dynamics during the design, so that the first-order bang-bang controller (bang-bang controller) is used to control the DC bus voltage with second-order dynamics, so as to maximize the control of the double-fed fan power grid side converter potential.

Description

technical field [0001] The invention relates to the technical field of modern power system protection and control, in particular to a step-down bang-bang control method for DC bus voltage of double-fed fan. Background technique [0002] With the huge penetration of power electronic converters in power systems, it is necessary to explore the maximum control potential of converters so that they can provide maximum system stability control capability under severely disturbed conditions. Power electronic converters are usually regulated by vector controllers. Traditional vector controllers are implemented with proportional-integral (PI) regulators. There is a trade-off between the response speed and the overshoot in the parameter adjustment of the PI regulator. Therefore, considering the overall system stability in various operating modes, the inverter controlled by the vector controller cannot provide the fastest and high-gain control performance, nor can it realize the maxim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/24
Inventor 雷云凯汪荣华李婷王云玲苟竞刘方苏韵掣刘莹朱觅李奥
Owner STATE GRID SICHUAN ECONOMIC RES INST