Generic Modeling of a Line Commutated HVDC System for Power System Stability Studies · 2015. 9....

Generic Modeling of a Line Commutated HVDC

System for Power System Stability Studies

Christoph Hahn

2014 IEEE PES T&D Conference and Exposition, 14th – 17th April 2014, Chicago



Slide 2 • Christoph Hahn • IEEE PES T&D Conference & Exposition • Chicago • 17th April 2014

Content

1. Introduction

2. Modeling of the HVDC

System

3. Control System

4. Comparison of the Generic

Model with an EMT Model

5. Conclusion

Reference: Siemens AG, Prof. Retzmann




1. Introduction

• Recently the desire to integrate HVDC systems in yet existing

AC networks has gained interest, for example in Germany due

to the German Grid Development Plan

• For so called hybrid AC/DC systems stability analyses are

crucial in order to guarantee a secure system operation

Vsr ,fr

Vdr Vdi

Id Ld Rd

Xci

Vsi ,fi

AC Grid 1

AC Filters

AC Grid 2

AC Filters

Xcr

Vpr Vpi




2. Modeling of the HVDC System

r crdr sr d

3 2 3cos ,V B V B X I

i cidi si d

3 2 3cosB V B IV X

d

d d d dr di

d d

,I

I R L V Vt

(s)

d sr r11 12

di si i21 22

(s)(s) (s)

(s)(s) (

(s) cos (s)

(s) coss (s) )

I G G

V G G

V

V

G

G11

i

G12

G21

G22

Id

VdiCOS

COSr

Vsr

VsiX

X




Pole Control

3. Control System

MIN

Vdr

Vdr

PdrefIdref, P

Idref, VDCOL

IdΔI

VDCOL

Idref

αr arcos

dr

1

1 sT

Np

N

1 s

s

TK

T

PI-controller

MIN

VdiIdref, VDCOL

VDCOL

αi

K CECC(s)

MIN

Id

IdrefCEC

g

gref

Imarg(typ. 0.1 p.u.)

Vdi

Vdiref

ΔV

IdRd

arcos

arcos

arcosN

p

N

1 s

s

II

I

TK

T

Np

N

1 s

s

VV

V

TK

T

N

p

N

1 s

s

TK

T

Rectifier Control: Inverter Control:




Station Control

Vsref r/i, QACref r/i

Vsr/i, QACr/i

≥ΔVmax,

≤ΔQmin

Upper AC-Filter

number reached?

no yes

yesk++no Wait Tk

≤ΔVmin,

≥ΔQmax

Lower AC-Filter

number reached?

no yes

yesk--no Wait Tk

≥ΔVmax,

≤Δαmin

Upper tap

limit reached?

no

Vsref r/i, αref r/i

Vsr/i, αr/i

yes

yesTap++no Wait TTap

≤ΔVmin,

≥Δαmax

Lower tap

limit reached?

no yes

yesTap--no Wait TTap

AC Filter Control:

Tap Changer Control:

3. Control System




4. Comparison of the Generic Model with

an EMT Model

Rectifier & Inverter firing angles: DC Voltage & Current:

Both models are matching in a broad operating range!




4. Comparison of the Generic Model with

an EMT Model

Start-Up Process of the HVDC system:




5. Conclusion

• The development process of an HVDC model for stability analysis was

carried out

• Subsequently the entire HVDC control including the pole control

(rectifier and inverter control) and the station control (power, AC filter

and tap-changer control) was modeled and added to the HVDC model

• A comparison with an EMT HVDC model was performed

The transient behavior of the stability model fits to the EMT model

• This approach comprises modeling of the entire HVDC system and its

control schemes for large signal analysis, including detailed

simulations




Contact

Dipl.-Ing. Christoph Hahn

Friedrich-Alexander University Erlangen-Nuremberg

Chair of Electrical Energy Systems

Konrad-Zuse-Str. 3-5

D-91052 Erlangen

Germany

Fon: +49 9131 85 234 52

Fax: +49 9131 85 234 99

E-Mail: [email protected]

Web: http://ees.eei.fau.de

Generic Modeling of a Line Commutated HVDC System for Power System Stability Studies · 2015. 9....

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