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A HIGH-FREQUENCY LINK MULTILEVEL CASCADED MEDIUM-VOLTAGE CONVERTER FOR DIRECT GRID INTEGRATION OF RENEWABLE ENERGY SYSTEMS

A HIGH-FREQUENCY LINK MULTILEVEL CASCADED MEDIUM-VOLTAGE CONVERTER FOR DIRECT GRID INTEGRATION OF RENEWABLE ENERGY SYSTEMS

 ABSTRACT:

          Recent advances in solid-state semiconductors have led to the development of medium-voltage power converters (e.g.,6–36 kV) which could obviate the need for the step-up transformers of renewable power generation systems. The modular multi-level cascaded converters have been deemed as strong contenders for the development of medium-voltage converters, but the converters require multiple isolated and balanced dc supplies. In this paper, a high-frequency link multilevel cascaded medium-voltage converter is proposed. The common high-frequency link generates multiple isolated and balanced dc supplies for the converter, which inherently minimizes the voltage imbalance and common mode issues. An 50v system is designed and analyzed taking into account the specified system performance, control complexity, cost, and market availability of the power semiconductors.

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