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Abstract
This article presents a coordinated control strategy for a hybrid autonomous power system to obtain a smooth power transfer between diesel generator and battery energy storage system under transient conditions. In addition, a battery management scheme is also developed to maintain the battery state of charge around 70 to 80% to absorb/inject power under transient conditions and maintains the diesel generator power above 40% of its nominal value. Simulation studies are carried out in MATLAB/Simulink and the performance of the controller is validated experimentally on a laboratory test setup. A TMS320LF2407A DSP controller is used to digitally implement the control strategy and the overall scheme is verified with step changes in load. Moreover, the dynamic behavior of the system is also investigated by directly connecting an induction motor.
NOMENCLATURE
| R | = | resistance (Ω) |
| L | = | inductance (H) |
| P | = | power (W) |
| v | = | instantaneous voltage (V) |
| rsh | = | shunt resistance per phase (Ω) |
| ω | = | angular frequency rad/s (electrical) |
| i | = | instantaneous current (A) |
| Lmq | = | q-axis magnetizing inductance (H) |
| Lsh | = | shunt leakage inductance per phase (H) |
| Lmd | = | d-axis magnetizing inductance (H) |
| Llfd | = | field leakage inductance (H) |
| ωe | = | angular speed of rotor rad/s (electrical) |
| T | = | time delay |
| K | = | system gain |
| λ | = | flux linkage (wb-t) |
| Kp | = | proportional gain |
| Ki | = | integral gain |
| = | First Subscripts | |
| WG | = | wind generator |
| r | = | rotor |
| s | = | stator |
| m | = | mutual |
| DG | = | diesel generator |
| ls | = | stator leakage |
| f | = | field |
| p | = | phase |
| t | = | terminal |
| BESS | = | battery energy storage system |
| = | Second Subscripts | |
| d | = | direct axis |
| q | = | quadrature axis |
| ref | = | reference |
| inv | = | inverter |
Additional information
Notes on contributors
Chellachi Kathiresan Aravind
Chellachi Kathiresan Aravind received the Diploma in Electrical and Electronics Engineering from Noorul Islam Polytechnic College, Nagercoil, India, a B.E degree from K.S.R Group of Institution, Namakkal, India, and the M.Tech degree from VIT University, Vellore, India. From 2009 to 2011, he was with the department of Electrical and Electronics Engineering, SASTRA University, Tanjore, India. He is currently a Full-time Research Scholar with the National Institute of Technology, Tiruchirappalli, India. He is a Member of the IEEE. His areas of interest include power electronics, renewable energy systems and FACTS controllers.
Ganesan Saravana Ilango
Ganesan Saravana Ilango received the B.E. degree from the University of Madras, Chennai, India, in 2000, the M.E. degree from Bharathidasan University, Tiruchirappalli, India, in 2001, and the Ph.D. degree from the National Institute of Technology, Tiruchirappalli. From 2001 to 2004, he was a Lecturer with Noorul Islam College of Engineering, Kumaracoil, India. Since 2006, he has been an assistant professor with the National Institute of Technology. His area of interest includes power electronics, flexible AC transmission systems, and renewable energy systems.
Chilakapati Nagamani
Chilakapati Nagamani received the B.Tech. degree from Sri Venkateswara University College of Engineering, Tiruapati, India, the M.Tech. degree from the Indian Institute of Technology, Kanpur, India, and the Ph.D. degree from the University of Technology, Sydney, Australia. From 1985 to 1991, she was with the Central Power Research Institute, Bangalore, India. Subsequently, she joined the Department of Electrical and Electronics Engineering, National Institute of Technology (then known as Regional Engineering College), Tiruchirappalli, India, as a lecturer, where she is currently a professor. Her areas of interest include power electronics and drives, renewable energy systems, and FACTS controllers.
Maddikara Jaya Bharata Reddy
Maddikara Jaya Bharata Reddy received the B.E. degree in Electrical and Electronics Engineering from Nagarjuna University, Guntur, Andhra Pradesh, India, in 2002. He received the M.E. degree in electrical engineering and the Ph.D. degree from Birla Institute of Technology (BIT), Ranchi, India, in 2004 and 2008, respectively. He is currently an associate professor in the Department of Electrical and Electronics Engineering, National Institute of Technology (NIT), Tiruchirappalli. He has 10 years of experience in teaching and research. In 2010, he received the prestigious national level IEI Young Engineers Award in the field of Electrical Engineering. He is a senior member of the IEEE. He is an editor of Electrical Power Components and Systems.His current research interests include smart grid, substation automation, wide-area protection, digital relaying, soft computing applications in power system, power quality analysis, and power system protection.