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This paper presents a novel method and system for an electric power alternating-current (AC)-to-direct-current (DC) converter employing composite technology. The term composite entails utilization of more than one type of conversion operating in parallel. In addition, background information for the prior art, based on conventional autotransformer rectifier units (ATRUs), and active converters are discussed. The major requirements of AC-to-DC converters from both functional and protection perspectives are provided. The concept of the new approach is defined. Comparative analysis between the new and old methods is documented. The performance features and technical details of the system parameters with respect to AC-to-DC converter system requirements are presented and discussed. Analysis, simulation results, and test data are included. Finally, the advantages of this technology, which nearly doubles power density compared to the state-of-the-art, are summarized and a conclusion included.

Honeywell is currently working on several projects utilizing high-reactance permanent magnet machines (HRPMM) to develop advanced, high-performance power generation systems (HPPGS). These power generation systems (PGS), offer greatly increased safety and reduced operating costs compared to previous hardware. The approach utilizes an HRPMM that presents reduced short-circuit currents with simplified power topology and specifically developed control algorithms. These architectures offer inherent fail-safe features in that the maximum possible short-circuit current is not significantly higher than the normal operating current. Control approaches are discussed. Methodologies for system optimization to achieve top performance and robust operation are included. These power generators support implementation of on-shaft integration with the plant.