ANALYSIS AND DEVELOPMENT OF HIGH PERFORMANCE ELECTRONIC CONVERTERS WITH WIDE BAND GAP DEVICES

Student: Giuseppe AielloTutor: Prof. Mario CacciatoAcademic Year: 2016/17

Using a purely analog control oftendoes not allow to fully respect themultiple specifications of a converter.For this reason, a digital controlsolution is preferred, which is veryflexible.

Control Strategy“Mixed Signal”

Flow Chart

The platform

For experimental results, a 10kW three-phase rectifier prototype was developed

The proposed digital algorithm structure distinguishesitself in multiple tasks with its execution priority to tryto minimize "fault" conditions to the Power converter.

Comparasion Topology choiceSimulation results

Next years

98-99% 96%

Efficiency

Volume & Weight

Power density

Lower Ron;

Higher breakdown voltage;

Operability at high temperature;

Greater reliability;

Best Recovery;

Operability at high frequency.

DOTTORATO DI RICERCA NAZIONALE IN INGEGNERIA

DEI SISTEMI, ENERGETICA, INFORMATICA, E DELLE

TELECOMUNICAZIONI XXXII CICLO

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10

0.1

0.2

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0.5

0.6

0.7

M[u]

Co

eff[u

]

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0.2

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M[u]

Co

eff [u

]

Corrente Switch (rms)

Corrente Switch (avg)

Corrente Switch (rms)

Corrente Switch (avg)

VR

6SVR

VR

6SVR

VR

6SVR

VR

6SVR

AnalysisVarious topologies were analyzed to the circuit simulator to highlight the one that best for the goal of the research project.Defined the circuit model, the equivalent mathematical model is obtained from which the first numerical results are obtained.

Risultati HIL

FPGA 𝜇𝐶Realtime

It is important, therefore, to use high-performance digitalsystems, especially due to the ever higher bandwidth requestfrom the controls, but this affects costs. The solution is amixed signal solution that represents a great compromise as itprovides the flexibility of digital control and the excellentdynamics of the analogue

Vin 400 V

Vout 800 V

P0max 13 kW

fs 70 𝑘𝐻𝑧 – 200kHz

First tests carried out using a Hardware In the Loop approach showed the

goodness of implemented algorithms

SETUPINIT

PLLTIMER

INTERRUPTOVER

CURRENT

INTERRUPTZVD_A

WHILE

RESETPLL

TIMER

READZVD_B&C

VOLTAGELOOP

UPDATELUT

PWM

SMEDSTOP

FAULT

FAN

MODE

DELAY

INTERRUPTSYSTMR

SYNCRO ARM BACKGROUNG

PRIORITY 3MAX

PRIORITY 2 PRIORITY 1 NO PRIORITY

NO SYNCRO

Vdc_Ref

Voltage ControlADC 2

ADC 3

Vcap_up

Vcap_dw

DIGIN[3]

DIGIN[4]

DIGIN[5]

PLL

ZVD A

ZVD B

ZVD CI_Sin_RefGenerator

VO

LTA

GE

SEN

SIN

G

Ifeed_A

Ifeed_B

Ifeed_C

CU

RREN

T SE

NSI

NG

ANALOGCURRENT CONTROL

PI

PI

PI

STM8

PI_A

PI_B

PI_C

SMED

CPM0

CPM1

CPM2

CPP0

CPP1

CPP2

COMP_0

COMP_1

COMP_2

SMED_1

SMED_2

SMED_3

PWM1

PWM2

PWM3

STNRG

PWM_A

PWM_B

PWM_C

CLK

SQR

TRIANGLE

ANALOGINTEGRATOR

1/S

SMED_4

SMED_5

SMED_6

PWM4

PWM5

PWM6

LPF

ANALOGFILTER

PWM_VA

PWM_VB

PWM_VC

LPF LPF

REG1

Iref_A

Iref_B

Iref_C

CPM0 CPM2CPM1CLK

CPM1 CPM2CPM3

REG1

TopicExisting common technologies, based on the use of silicon electronic devices, have low thermal limits and limits inmaximum working frequency. Over the last few years, we have witnessed the development of new state-of-the-artpower electronics, called Wide Band Gap (WBG), able to overcome these limitations. The use of WBG devices isbringing benefits in terms of performance and is becoming a universal solution in all power electronics applications.The goal of the research project is to analyze and study innovative power electronic converters using WBG devices toachieve higher efficiency values than 99%, and to achieve a increased power density in terms of volume and weight.