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Rene Spee, Shibashis Bhowmik, Johan H R Enslin: Performance optimization controller and control method for doubly-fed machines. The State of Oregon Acting by and Through the State Board of Higher Education on Behalf of Oregon State University, Klarquist Sparkman Campbell Leigh and Whinston, August 25, 1998: US05798631 (228 worldwide citation)

A variable speed, constant frequency (VSCF) system utilizes a doubly-fed machine (DFM) to maximize the output power of the system. The system includes a power converter that provides a frequency signal and a current signal to the DFM. The power converter is controlled by an adaptive controller. The ...


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Sukumar Kamalasadan, Sherif Abdelmageed Abdelrazek, Johan H R Enslin, Daniel Blair Sowder: Grid tied system controller including logic coupled to a photovoltaic station and an energy storage system. The University of North Carolina at Charlotte, Duke Energy Corporation, Clements Bernard Walker PLLC, Christopher L Bernard, December 12, 2017: US09843189

A battery energy storage system control system, including: logic coupled to a photovoltaic station and an energy storage system and executing a photovoltaic station capacity firming algorithm operable for making a combined output of the photovoltaic station and the energy storage system substantiall ...