Isolated Wind-Hydro Hybrid System Using Cage Generators and Battery Storage

• Published in: IEEE transactions on industrial electronics (1982) Vol. 58; no. 4; pp. 1141 - 1153
• Main Authors: Goel, Puneet K, Singh, Bhim, Murthy, S S, Kishore, Navin
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.04.2011; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Batteries; Battery; Battery energy storage system (BESS); Control algorithms; Control systems; Dynamical systems; Electric batteries; Electric potential; Frequency; Hybrid power systems; Hybrid systems; Induction generators; Insulated gate bipolar transistors; Load; Matlab; Nonlinear dynamics; Pulse width modulation; Pulse width modulation converters; small hydro; squirrel-cage induction generator (SCIG); Studies; Voltage; Voltage control; Wind energy generation; Wind turbines; wind-energy-conversion system (WECS)
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2009.2037646

This paper deals with a new isolated wind-hydro hybrid generation system employing one squirrel-cage induction generator (SCIG) driven by a variable-speed wind turbine and another SCIG driven by a constant-power hydro turbine feeding three-phase four-wire local loads. The proposed system utilizes two back-to-back-connected pulsewidth modulationcontrolled insulated-gate-bipolar-transistor-based voltage-source converters (VSCs) with a battery energy storage system at their dc link. The main objectives of the control algorithm for the VSCs are to achieve maximum power tracking (MPT) through rotor speed control of a wind-turbine-driven SCIG under varying wind speeds and control of the magnitude and the frequency of the load voltage. The proposed wind-hydro hybrid system has a capability of bidirectional active- and reactive-power flow, by which it controls the magnitude and the frequency of the load voltage. The proposed electromechanical system using SCIGs, an MPT controller, and a voltage and frequency controller are modeled and simulated in MATLAB using Simulink and Sim Power System set toolboxes, and different aspects of the proposed system are studied for various types of linear, nonlinear, and dynamic loads, and under varying wind-speed conditions. The performance of the proposed system is presented to demonstrate its capability of MPT, voltage and frequency control (VFC), harmonic elimination, and load balancing.