Startseite Modelling and Dynamic Stability Study of Interconnected System of Renewable Energy Sources and Grid for Rural Electrification
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Modelling and Dynamic Stability Study of Interconnected System of Renewable Energy Sources and Grid for Rural Electrification

  • Swati Bhamu EMAIL logo , T. S. Bhatti und Nikhil Pathak ORCID logo
Veröffentlicht/Copyright: 1. Februar 2019

Abstract

This paper presents modelling and dynamic stability study of an interconnected system of renewable energy sources (RES) and grid. The objective of this system is to utilize RES for providing continuous power to a cluster of villages having fixed feed of power supply from the grid. The renewable energy sources considered in the interconnected system are wind and biogas. Therefore, dynamic models for doubly fed induction generator (DFIG) and squirrel cage induction generator (SCIG) based wind energy conversion system have been developed for the proposed interconnected system. The static synchronous compensator (STATCOM) has also been employed to stabilize system voltage as per the requirement while, synchronous generator-based biogas genset has been used for system frequency and voltage regulation. The behavior of the proposed system has been analyzed under various load and input wind power disturbances.

A Appendix

The constants K1G, K2G, K3G, K4G of eqs. (37) & (38) are given as:

(40)K1G=EGVcosθXG
(41)K2G=EGsinθXG
(42)K3G=EGsinθXG
(43)K4G=EGcosθ2VXG

The small deviation in voltage behind transient reactance, ΔE’qb(s)is given by:

(44)(1+sTGB)ΔEqB(s)=[K1BΔEfdB(s)+K2BΔV(s)]
(45)K1B=XdBXdB
(46)K2B=(XdBXdB)cos(δ+θ)XdB
(47)KRB=(1pfb2)pfb2

Rated capacity of the Plant: 1.5 MW

Gain and Time constant of the system: Kf=75 Hz/pu kW; Tf=15s

Reactive power gain constants of the system

KV=1.5 pu kV/pu kVAR; TV=0.00212 s

Grid

PG=0.2 pu kW; QG=0.09686 pukVAR; K1G=−2.8746; K2G=0.2; K3G=0.2; K4G=−2.6809

Wind Energy Conversion System

s=0.0333; PW=0.1333 pu kW

SCIG: QW=0.02753 pu kVAR

K1W=0.0889; K2W=1.267; K3W=0.0184; K4W=0.5474

STATCOM: QSTAT = 0.26922; KSTAT1= 0.7994; KSTAT2=0.730794

DFIG

QW=0.14169 pu kVAR; K1D=0.9977; K2D=6.665; K3D=0.2834; K4D=2.2347

Biogas

PBSG=0.33335; QBSG=0.16145; Xd=1.0 pu; Xd’=0.15 pu; Tdo=5s; TB=0.75s; K1B=0.15; K2B=0.84326; K3B=2.45; K4B=2.308; TB1=0.01s; TB2=0.02s; TB3=0.15s; TB4=0.2s; TB5=0.014s; TB6=0.04s; TB7=0.036s; KAB=200; TAB=0.05s; KEB=1; TEB=2s; KFB=0.5; TFB=1s; Reactive power participation factor: KRB=0.48432

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Received: 2018-05-20
Revised: 2018-12-10
Accepted: 2019-01-12
Published Online: 2019-02-01

© 2019 Walter de Gruyter GmbH, Berlin/Boston

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