Isolated hydro simulations

8/12/2019 Isolated hydro simulations

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An Improved Electronic Load

controller for isolated small hydro

schemes

Samundra Gurung

2011227041Under the guidance of

Dr. Somasundram


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Contents

Objective

Work done

One line diagram of the proposed system

Results

Works ahead


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Objectives

To design an electronic load controllerwhich helps in regulation of reactive

power and frequency

An improved load controller which canalso perform functions of voltageregulation, harmonic eliminator, load

balancer and neutral currentcompensator


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Block diagram of theproposed system

IG Linear/Nonlinear load

Excitation

Capacitor

Statcom

Dump load

controller


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SEIG

Induction machine P=7.5kW,400V,50Hz

Rs=1.405ohm,Xs= 0.005839H,Rr=1.395 ohm

Xlr= 0.005839H,Xm=0.1722H,p=4

Q=4.6Kvar


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Simulink setup


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V(L-L) I P(1-ph) Q(1-ph)

11.55 1.325 2.781 15.26

23 2.689 11.58 61.02

161 18.82 567.5 2990

415 48.37 3591 1.979*10^4

704 81 1.03*10^4 5.678*10^4


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Calculate Vg using

= (cos jsin())/(Rs +j *XS)

=

=

=

=

= 3 /


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Ref curr generation technique

Vdc ref

p

q

Vt

Vtref

LPF(10Hz) I calc

abc/dq

= Unitvoltagetemplategenr

Quadvoltagetemplate

genr

Constant

PI

PI

V,i

V,i

I calc+

+

ifa*,ifb*,ifc*0(ifn)

HysPWM

ia*,ib*,ic*in

Pulses


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=

= 1/ 3

= (

+

+

)

ua=va/Vt;ub=vb/Vt;uc=vc/Vt;

= / 3+uc/ 3; wb=

*ua+

(ub - uc);

wc=

*ua+

(ub-uc);

=

p = posc + pav q= qosc + qav


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Statcom with unbalancedcondition

Pload=20kW

After 0.1s, a phase is opened


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Statcom with non-linear load

3phase diode rectifier with 10 ohmsresistor


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Statcom with reactive load

Pload=10kW

Qload=20kVar


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Inst pq theory

Clarktranfn

p

q

LPF(10Hz)InvClarktranfn

Refcurrentgenr

Caperror

-+

If*

ifaPWM

switching


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Contd..

=

1/ 2 1/ 2 1/ 2

1 1/2 1/2

0

*

p=valph*ialph+vbeta*ibeta+vo*io

q=valph*ibeta-vbeta*ialpha

p=posc+pav

q=qosc+qav

=

+*

*


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Contd..

=

1/ 2 1 0

1/ 2 1/2

1/ 2

*


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statcom with reactive load

Pload=10kW

Qload=15kVAR


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Statcom with non-linear load

3phase diode rectifier with 10 ohmsresistor


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Works remaining

Terminal voltage and frequencyregulation

Better filtering of some waveforms

Integrating into a single system

Isolated hydro simulations

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