The back‐to‐back (BTB) converter is used in power conversion applications such as machine drives, wind energy conversion systems (WECS), uninterruptible power supplies and high‐voltage, direct current transmission systems. Various topologies have evolved around voltage source converters and current source converters (CSCs) in an attempt to meet various design and reliability constraints. This paper proposes a new CSC‐based BTB converter suitable for WECS application. The proposed configuration addresses the main drawbacks of the conventional BTB CSCs, such as the over‐voltage frequently experienced by switches during commutation. The inverter side converter has zero switching losses. The proposed WECS offers the following advantages: simple and easy control, reduced switching frequency and maximum power point tracking with controllable grid active and reactive power. A low‐voltage ride‐through (LVRT) solution is also provided in the proposed WECS. PSCAD/EMTDC simulation is used to assess the steady‐state and dynamic behaviours of the proposed system under different operating conditions and during LVRT. Experimental results allow steady‐state and dynamic behaviour assessment of the proposed system under different operating conditions.
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Abdelsalam et al. (2014) studied this question.
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