Fuzzy Logic Controller Base on Fuzzy Logic Controller Base on Direct Torque ControlDirect Torque Control

Fuzzy Logic Controller Base on Fuzzy Logic Controller Base on Direct Torque ControlDirect Torque Control

Pedro Ponce* Juan C. Ramírez **

*Departamento de Ingeniería Eléctrica, Instituto Tecnológico de

Estudios Superiores de Monterrey.** Section of Graduate Studies and Research , College of Electrical

and Mechanical EngineeringNational Polytechnic Institute

 

T

T

s

T

i

Selection

TableINVERTER

INDUCTIONMOTOR

i

v

s

v

*

dtRIV ssss

sin2

3ss IPT

sd

sqs tan

1

Schematic of Conventional DTC Induction Motor Drive With Voltage

Source Inverter (VSI)

Voltage Space Vectors

V_k

V_k+1V_k+2

V_k+3

V_k-2 V_k-1

s

s

V_0

K-th Sector

V_7

StatorFlux

Torque

V_k V_k+1 V_k+2 V_k+3 V_k-2 V_k-1V_0V_7

Table 1. Space vector voltage influence on torque and stator flux space vector.

Stator Flux Vector Problems

Stator flux response in constant-torque region.

Conventional DTC Responses

Performance Of Dtc Using Variable Switching Sectors

VSI

INDUCTIONMOTOR

M O D E LO D E LA D IN A M IC A D E L

M O TO R D E IN D U C C IO N

S

Te sCal. Cal.

Te

s

Ref.

Ref.

FLUX ANDTORQUE

ESTIMATOR

SVM

+

+

-

-

P W M

FUZ ZY CO NTROL

dt

dRiV SSSS

Proposed DTC scheme

• The space vector model of induction motor in rotating reference framework, can be describe

SkS

SSS jdt

dRiV

SS

The stator voltage components (Vsx-Vsy) are given by :

dt

dV

S

SX

SkSY jV

Vsx and Vsy per unit values versus stator flux position

Fuzzy Logic Angle Controller.

Space Vector Modulation

1sQ

1sDV1 (100)

V2 (110)V3 (010)

V4 (011)

V5 (001) V6 (101)

V7, V8

T * V 11

T * V22

VE

AA B

C

A

VT

C

VT

B

VEsin

*

sin

*

sin2211 B=120° & A+C=60°

T1 + T2 + T0 = T

BV

AVT E

sin*

60sin*

11

BVAV

T E

sin*sin*

22

T0 = T- T1 - T2

Transient Conditions

REF

BUSDC

Fs

FstUFs

22 *

Simulation Results

• A = 0; B= 300 , and C Reference

(A)

A = 0; B = 150; C = 250 and D = 300

(B)

Torque (A) and stator flux response (B).

Stator flux locus

Stator flux response in constant-torque and Field weakening regions for =300

and HB=0.002.

Stator flux response

Stator flux locus

Stator Currents

Current Spectrum

Switching Frequency