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Letas Heinz Hermann, Limbeck Volker, Scheibe Klaus, Lehmann Eberhard, Wilmes Thomas, Venker Michael: Lightning protection system for wind turbines. Repower Systems, Stemmann Technik, August 31, 2005: EP1568883-A2 (25 worldwide citation)

The wind energy generator has a propeller (2) driven generator in a housing (4) that is mounted on a pillar (5). The system is protected against lightning strikes (1) by a conductor system (10,11,12) coupled to ground (7). The system uses a slip ring and brush to connect between rotary and stationar ...


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Fortmann Jens, Letas Heinz Hermann: (De) Windenergieanlage mit einem blindleistungsmodul zur netzstützung und verfahren dazu, (En) Wind power plant comprising a reactive power module for supporting a power supply system and corresponding method. Repower Systems, Fortmann Jens, Letas Heinz Hermann, GLAWE DELFS MOLL, April 7, 2005: WO/2005/031160 (11 worldwide citation)

(EN) The invention relates to a wind power plant comprising a rotor, a generator driven by said rotor and generating and feeding electrical power to a power supply system, and a control unit controlling operation of said plant and comprising a reactive power control module. According to the inventio ...


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Letas Heinz Hermann Dr, Schmude Manfred: Method of operation of a windpark and a windpark. Repower Systems, February 14, 2007: EP1752659-A2 (7 worldwide citation)

The method of operating an offshore wind energy park involves detecting a deterioration in the power grid (10) or a signal to allow preparation of the operation of a transfer grid (11). An emergency power source, such as a Diesel generator is placed into operation (15) and its output is stepped up u ...


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Fortmann Jens, Letas Heinz Hermann: (De) Verfahren zum betreiben einer windenergieanlage bei überspannungen im netz, (En) Method for operating a wind energy system in case of overvoltage in the grid. Repower Systems, Fortmann Jens, Letas Heinz Hermann, SEEMANN Ralph, October 23, 2008: WO/2008/125163 (5 worldwide citation)

(EN) The invention relates to a method for operating a wind energy system (15-19) comprising an electrical generator (30) driven by a rotor (25-29) for outputting electrical power to an electrical grid (31) allowing for a grid voltage, wherein idle power from the wind energy system (15-19) is fed in ...


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Fortmann Jens, Letas Heinz Hermann Dr: Wind energy installation with converter control and method of operation. Repower Systems, April 5, 2006: EP1643609-A2 (4 worldwide citation)

The system (1) has a generator driven by a rotor (10) with a converter (17) for supplying electrical energy via a combination point into an electrical supply network and a control device (18) with a converter controller. The controller has an input connection for a desired value for the voltage to b ...


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Letas Heinz Hermann: (De) Windenergieanlage mit einer autarken energieversorgung für eine blattverstelleinrichtung, (En) Wind energy installation with an autonomous energy supply for a blade adjustment device. Repower Systems, Letas Heinz Hermann, GLAWE DELFS MOLL, December 21, 2007: WO/2007/144146 (3 worldwide citation)

(EN) Wind energy installation with a generator (13) which is driven by a rotor (2) with adjustable rotor blades (21), for producing electrical energy, wherein a pitch adjustment device (3) is provided for adjusting the blades, which pitch adjustment device comprises an emergency circuit (5) with an ...


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Letas Heinz Hermann, Peters Matthias: Überwachungseinrichtung für pitchsysteme von windenergieanlagen (DE), Monitoring device for pitch systems of wind energy systems (EN). Repower Systems, Letas Heinz Hermann, Peters Matthias, Glawe Delfs Moll, December 10, 2009: WO/2009/146848 (3 worldwide citation)

The invention relates to a wind energy system having a rotor (12), a generator being driven by the same for generating electric energy, wherein the rotor has at least one blade (14) that can be adjusted by a pitch device (2), and wherein the pitch device (2) comprises an energy supply unit having a ...


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Fortmann Jens, Letas Heinz Hermann: (De) Windenergieanlage mit gegensystemregelung und betriebsverfahren, (En) Wind energy installation with negative sequence system regulation and operating method. Repower Systems, Fortmann Jens, Letas Heinz Hermann, GLAWE DELFS MOLL, May 29, 2008: WO/2008/061698 (3 worldwide citation)

(EN) The invention relates to a wind energy installation comprising a generator which is driven by a rotor and generates electrical power in a multiphase manner for feeding into a network, a converter which is connected to the generator and to the network, and a control system which interacts with t ...


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Letas Heinz Hermann Dr: Rotor blade pitch adjustment apparatus. Repower Systems, January 17, 2007: EP1744444-A1 (2 worldwide citation)

The system has an adjustment unit with an actuator (5) having an excitation coil and a blade controlling module. A generator is driven by a rotor, where the unit has normal and emergency modes. The actuator is controlled by the module in the normal mode and is unregulated in the emergency mode. The ...


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