A PWM Controlled IGBT based VSCS with a Battery Energy Storage System for an Isolated Wind-Hydro Hybrid System Using Cage Generators

D. Narendra, N.V.A Ravi Kumar

Abstract


This paper presents a Pulse WidthModulation (PWM) controlled Insulated Gate Bipolar Transistor (IGBT) based Voltage SourceConverters (VSCs) with a battery energy storagesystem (BESS) for an isolated wind-hydro hybridsystem using two squirrel cage induction generators(SCIG) or simply two cage generators, one driven bya variable speed wind turbine and another driven bya constant power hydro turbine. The proposed systemhas a battery energy storage system (BESS) at themiddle of two back –to-back connected pulse widthmodulation (PWM) controlled insulated-gate-bipolar–transistor (IGBT) based voltage source converters(VSCs).The main objectives of the control algorithmfor the VSCs are to achieve the maximum powerpoint tracking (MPPT) through rotor speed control ofa wind turbine driven SCIG at machine side (orgeneration side) and to control the magnitude andfrequency of the load voltage at load side( or hydropower generation side). The proposed system has afacility to bidirectional real and reactive power flow,by which it controls the magnitude and frequency ofthe load voltage. The control techniques with windhydro
hybrid power is modeled and simulated inMATLAB 2009a environment using Simulink andSim Power System set tool boxes. The proposedsystem studied under various load conditions withdifferent input wind speeds.

References


Parameter of 37.3-kW 415-V 50-Hz Y-

connected SCIG

h

: R

=0.09962Ω ,

R

r

=0.059 Ω, L

s

s

=0.870 mH , L

=0.030370

H , and Inertia=0.4 kg.m

r

Parameters of 55-kW 415-V 50-Hz, Y-

connected six-pole SCIGw

:

R

=0.060 Ω,

Ls=0.690 mH, R

r=

0513Ω, L

m

s

=0.0298 H,

and Inertia =1.5 kg.m

.

Parameters of 55-kW wind turbine: wind

speed range = 5.0-12m/s, speed range =

-82 r/min, I=13.5 kg.m

,

r = 7.5 m,

C

pmax

=0.04412, and λ

*

=5.66

Machine side converter: Active power

(Psw) = 55kW, Reactive power (Qsw)

=18.4kvar.

Load side converter: Reactive power (QL)

= 67.5 kvar, KVA rating =112.5kVA.

RC Filter and AC inductor: R=5.0Ω,

C=5.0µF, L

76 mH.

BESS specifications: C

f =

=43157 F,

R

b

=10kΩ, R

in

b

=0.2Ω, Voc max = 750V,

Voc min= 680V, Storage = 600 kW.h, L=

mH.

PI controllers: K

pv

=15 and K

=0.05.

1:1 Zig Zag Transformer Specifications:

iv

three single phase transformer of 15 kVA

/138 V

REFERENCES

Puneet K. Goel, Bhim Singh, S.S.Murthy

and Navin Kishore, “Isolated Wind–Hydro

Hybrid System Using Cage Generators

and Battery Storage,” IEEE Transactions

on Industrial Electronics, Vol. 58, No.4,

April 2011.

[Online]: Available: http://mnre.gov.org.in

Sreekala.C.S and Anju Mathew, “Voltage

and frequency control of wind hydro

hybrid system in isolated locations using

cage generators”, 2013 IEEE, pp.no 132137.

S.Ranjith Kumar, S.Surendhar, Ashish and

P.Raja, “Zigzag Transformer performance

analysis on harmonic reduction in

distribution load,” International

Conference on Electrical, Control and

Computer Engineering, 2011, pp107-112,

IEEE.

G. Quinonez-Varela and A. Cruden,

“Modeling and validation of a squirrel

cage induction generator wind turbine

during connection to the local grid,” IET

Genre., Transmits. Distrib., vol. 2, no. 2,

pp. 301–309, Mar. 2008.

M. Black and G. Strbac, “Value of bulk

energy storage for managing wind power

fluctuations,” IEEE Trans. Energy

Convers., vol. 22, no. 1, pp. 197–205,

Mar. 2007.

Bhim Singh and V.Rajgopal, “Digital

Control of Voltage and Frequency of

Induction Generator in Isolated Small

Hydro System,” 2012IEEE International

Conference on power Electronics, Drives

and Energy System, vol.no1, pp 46734508.


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