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Frontiers in Energy

Front. Energy    2015, Vol. 9 Issue (1) : 31-42     https://doi.org/10.1007/s11708-015-0347-9
RESEARCH ARTICLE |
A smooth co-ordination control for a hybrid autonomous power system (HAPS) with battery energy storage (BES)
C. K. ARAVIND1,G. SARAVANA ILANGO2,*(),C. NAGAMANI1
1. Department of Electrical and Electronics Engineering, National Institute of Technology, Tiruchirappalli 620015, India
2. Department of Electrical and Electronics Engineering, National Institute of Technology, Trichy 620015, India
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Abstract

The standalone hybrid power system constitutes a synchronous generator driven by a diesel engine, renewable energy source (wind) apart from a battery energy storage system. A coherent control strategy to regulate the voltage and frequency of the standalone grid is proposed in this paper. The system is simulated using Matlab/Simulink for preliminary validation and further tested on a laboratory prototype which involves a TMS320LF2407A DSP controller to digitally implement the control strategy. The dynamic behavior of the system is perused through the direct connection of an induction machine. The control strategy is verified for step changes in load and variation in wind power.

Keywords standalone hybrid power system      battery energy storage system (BESS)      power conversion     
Corresponding Authors: G. SARAVANA ILANGO   
Just Accepted Date: 31 December 2014   Online First Date: 10 February 2015    Issue Date: 02 March 2015
 Cite this article:   
C. K. ARAVIND,G. SARAVANA ILANGO,C. NAGAMANI. A smooth co-ordination control for a hybrid autonomous power system (HAPS) with battery energy storage (BES)[J]. Front. Energy, 2015, 9(1): 31-42.
 URL:  
http://journal.hep.com.cn/fie/EN/10.1007/s11708-015-0347-9
http://journal.hep.com.cn/fie/EN/Y2015/V9/I1/31
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C. K. ARAVIND
G. SARAVANA ILANGO
C. NAGAMANI
Fig.1  Block diagram of proposed standalone power system
Fig.2  Schematic diagram of the coordinated control strategy
Fig.3  Experimental setup of standalone power system
Fig.4  Dynamic response for step increase in load (without BESS)

(a) Speed and voltage (Experimental scale (speed= 200 r/(min·div) (voltage= 415 V/div)); (b) power output (Experimental scale (power= 3000 W/div)); (c) current (Experimental scale (current= 10 A/div))

Fig.5  Dynamic response for step decrease in load (without BESS)

(a) Speed and voltage (Experimental scale (speed= 200 r/(min·div) (voltage= 415 V/div)); (b) power output (Experimental scale (power= 3000 W/div)); (c) current (Experimental scale (current= 10 A/div))

Fig.6  Dynamic response for step increase in load with BESS

(a) Speed and voltage (Experimental scale (speed= 200 r/(min·div) (voltage= 415 V/div)); (b) power output (Experimental scale (power= 3000 W/div)); (c) current (Experimental scale SG current= 10 A/div, BESS current= 5 A/div, load current= 10 A/div)

Fig.7  Dynamic response for step decrease in load with BESS

(a) Speed and voltage (Experimental scale (speed= 200 r/(min·div) (voltage= 415V/div)); (b) power output (Experimental scale (power= 3000 W/div)); (c) current (Experimental scale SG current= 10 A/div, BESS current= 10 A/div, load current= 10 A/div)

Fig.8  Power output of HAPS under change in wind speed and load demand
Fig.9  Dynamic response during direct starting of induction machine (without BESS)

(a) Simulation (without BESS); (b) experimental (without BESS); (c) simulation (with BESS); (d) experimental (with BESS)

vInstantaneous voltage/V
iInstantaneous current/A
VPer-phase steady-state voltage (rms)/V
IPer-phase steady-state current (rms)/A
RResistance/?
LInductance/H
PPower/W
rshShunt resistance per phase/?
ωAngular frequency (electrical)/(rad·s–1)
ωe<?Pub Caret?>Angular speed of rotor (electrical)/(rad·s–1)
LshShunt leakage inductance per phase/H
Lmdd-axis magnetizing inductance/H
Lmqq-axis magnetizing inductance/H
Llfdfield leakage inductance/H
λFlux linkage/Wb
KpProportional gain
KiIntegral gain
Subscripts
rRotor
sStator
mMutual
lsStator leakage
fField
pPhase
tTerminal
dDirect axis
qQuadrature axis
refReference
invInverter
Tab.1  
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