Standalone SCIG-based wind energy conversion system using Z-source inverter with energy storage integration

Alnasir, Zuher; Kazerani, M.

doi:10.1109/ccece.2014.6900924

Cited by 6 publications

(2 citation statements)

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“…Amongst the power converters which have been employed or have the potential to be employed in WECSs (i.e., VSC, CSC, ZSI, MC and IMC), VSC is the dominate topology in both large and small-scale WECSs [63]. The potential of an impedance-source inverter, as a replacement for the conventional VSI-dc booster combination in standalone WECSs, has been demonstrated in [76]- [78]. Although the use of MC and IMC, in a small-scale off-grid WECS, is a possibility, the commutation problems in MC need to be carefully addressed, and the absence of dc link component, in both configurations, complicates the integration of an electrical energy storage system.…”

Section: F) Matrix Convertermentioning

confidence: 99%

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A small-scale standalone wind energy conversion system featuring SCIG, CSI and a novel storage integration scheme

Alnasir

Kazerani

2016

Renewable Energy

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Small-scale standalone wind turbines provide a very attractive renewable energy source for off-grid remote communities. Taking advantage of variable-speed turbine technology, which requires a partial-or full-scale power converter, and through integrating an energy storage system, smooth and fast power flow control, maximum power point tracking, and a highquality power is ensured.Due to high reliability and efficiency, permanent magnet synchronous generator seems to be the dominating generator type in gearless wind turbines, employed for off-grid applications.However, wind turbines using geared squirrel-cage induction generator (SCIG) are still widely accepted due to their robustness, simplicity, light weight and low cost. Permanent magnet induction generator, a relatively new induction-based machine, has recently been recognized in the wind energy market as an alternative for permanent magnet synchronous generator. A thorough comparative study, among these three generator types, is conducted in this research in order to enable selection of the most appropriate generator for off-grid wind energy conversion system (WECS), subject to a set of given conditions. The system based on geared SCIG has been shown to be the most appropriate scheme for a small-scale standalone WECS, supplying a remote area.Different topologies of power electronic converters, employed in WECSs, are overviewed.Among the converters considered, current source converter is identified to have a great potential for off-grid wind turbines.Three current-source inverter-based topologies, validated in the literature for on-grid WECS, are compared for off-grid WECS application. Feasibility study and performance evaluation are conducted through analysis and simulation. Among all, the topology composed of three-phase diode bridge rectifier, DC/DC buck converter, and pulse-width-modulated current-source inverter (PWM-CSI) is identified as a simple and low-cost configuration, offering satisfactory performance for a low-power off-grid WECS.A small-scale standalone wind energy conversion system featuring SCIG, CSI and a novel energy storage integration scheme is proposed and a systematic approach for the dc-link inductor design is presented. iv In developing the overall dynamic model of the proposed wind turbine system, detailed models of the system components are derived. A reduced-order generic load model, that is suitable for both balanced and unbalanced load conditions, is developed and combined with the system components in order to enable steady-state and transient simulations of the overall system. A linear small-signal model of the system is developed around three operating points to investigate stability, controllability, and observability of the system. The eigenvalue analysis of the small-signal model shows that the open-loop system is locally stable around operating points 1 and 3, but not 2. Gramian matrices of the linearized system show that the system is completely controllable at the three operating points and completely observable at...

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Section: F) Matrix Convertermentioning

confidence: 99%

“…In [78], a buck-boost dc/dc converter was used to integrate a storage battery unit with a ZSI-based WECS through one of the ZSI's capacitors. …”

Section: E) Diode Rectifier Bridge + Impedance-source Invertermentioning

confidence: 99%