GRID FEED APPARATUS, ENERGY FEED SYSTEM AND METHOD FOR OPERATING A GRID FEED APPARATUS
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Abstract
The invention relates to a network feed device (10) for feeding electrical energy from a DC energy source (12) into a three-phase AC supply network (32), where the DC voltage of a DC intermediate circuit (24) is converted by means of at least one inverter unit (14) into a three-phase voltage and is fed by means of a transformer device (16) comprising three network transformer windings (38) into the AC supply network (24). The invention is characterized in that a first winding terminal of the network transformer windings (38) is connected to a half-bridge (30) of a first inverter device (14a), and a second winding terminal of the network transformer windings (38) of the transformer device (16) is connected to a half-bridge of a second inverter device (14b).
In subsidiary aspects, the invention relates to an energy feed system for the connection of a photovoltaic source, a fuel cell source, a battery source or a mechanically operated DC generator to an AC supply network or to an AC consumer, in particular a three-phase motor, and an operating method for energy-efficient voltage feeding.
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Citations
41 Claims
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1-21. -21. (canceled)
- 22. Network feed device for feeding electrical energy from at least one DC energy source into a three-phase AC supply network, where the DC voltage of a DC intermediate circuit is converted by means of at least one inverter unit into a three-phase voltage and is fed by means of a transformer device comprising three network transformer windings into the AC supply network, whereby a first winding terminal of the network transformer winding is connected to a half-bridge of a first inverter unit, and a second winding terminal of the network transformer winding of the transformer device is connected to a half-bridge of a second inverter unit, wherein the first inverter unit is operated synchronously with the network, in particular at 50 Hz or 60 Hz, to define the polarity of the supply network voltage to be delivered, and the second inverter unit is operated at a higher-frequency PWM cycle, in particular greater than 500 Hz, for modulation and smoothing of the supply network voltage to be delivered.
Specification