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Cao Tiến Huỳnh và Đtg Tạp chí KHOA HỌC & CÔNG NGHỆ 128(14): 149 - 154

156

GRID RETAINING CONTROL OF WIND POWER PLANTS SYSTEM USING

DOUBLY-FED INDUCTION GENERATORS BY PASSIVITY -BASED METHOD

Dang Danh Hoang*

College of Technology - TNU

SUMMARY

The surveying and evaluation of the quality of control method for wind power systems using

Doubly-Fed Induction Generators (DFIG) is a highly important signification.

A new designing methodology for the passivity-based nonlinear controller is applied to gain some

results which are described in this paper as can be seen, to control the Doubly-Fed Induction

Generators, to maintain grid retaining of system in syschronical fault case which lead to drop a

part of grid voltage

Key word: Passivity - based control , wind power, grid fault.

Notation

Notation Unit Meaning

R(x) Attenuation matrix

J(x) Matrix links blocks in

system structure.

G(x) Matrix represents input,

output relation.

Lr H Rotor’s induction.

Tr, Ts s Timing constant of rotor and

stator

r,  rad/s Rotor’s radian frequency,

mechanical angular speed of

rotor

sd, sq Wb Components d and q of

magnetic flux stator

rd, rq Wb Components d and q of

magnetic flux rotor

 Summing dissipated co￾efficient.

Lm H Mutual inductance between

stator and rotor

Abbreviation

DFIG Doubly-Fed Induction Generators

PĐSG Wind power generators.

EL Euler - Lagrange

PBC Passive based control

NL Energy

PREFACE*

Recently, in our country as well as in over the

world, controlling Doubly-Fed Induction

Generators in Wind power generators system

(PĐSG) is a considerative problem. Now,

there are some researchers who using a few

control methods, such as: accurate

* Tel: 0912 847588

linearazation[9], backstepping[1] and had

gotten positive results. We ourselves also

published searching projects in this field [2,

3]. This article introduces achievement of

passivity-based control method to control

Doubly-Fed Induction Generators in the case

of grid failure. In details:

Control to ensure wind power generators

using Double-Fed Three-phrases Induction

Generators in grid tracking when symmetrical

grid failure happened leading to drop apart of

grid voltage avoiding grid clumble if the

generators cut out of grid simultaneously.

There will be established systems containing

many wind power generators, therefore when

the errors happen, generators all cut out of

grid easily occurs grid clumble. Thus,

controling grid tracking is very important when

the errors occur. This study itself focused on

dealing the problem mentioned above.

PASSIVITY-BASED CONTROL METHOD

Fundamental theory

Passivity Based Control - PBC is controlling

algorithm which its principle based on

passitive characteristic of objects (open-system)

target to change closed-system being passive

with expective energy storage function.

Consider a system  which has summing

function of energy storage

H(x,x)

(positive

difining), input turning vector u, output y and

ignore disturbance. So that, delivery speed of