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A new control concept for inverter systems in wind turbines is proposed. Thereby only as many parallel connected inverter units as needed are activated to feed in the momentary generated power into the grid. Each inverter unit is equipped with an individual controller without additional communication between the inverter units. The load dependent activation and deactivation of inverter units is controlled...
An electronic over current breaker (OCB) for DC-grids without the need of additional sensing circuitry is presented. The OCB consists of standard Si-MOSFETs and is cascoded with SiC-JFETs for increased blocking capability. The over current detection threshold can be adjusted in a wide range. Due to the lack of additional sensing circuitry, the detection and clearing of a fault current is extremely...
Power generation using renewable resources is replacing conventional generation using steam power plants all over the world. Therefore a new control concept is shown, enabling a wind power station to behave just as like the synchronous generator in a steam power plant providing ancillary services. The main focus is on the provision of instantaneous and primary reserve and the ability to dampen grid...
In direct drive applications TFM have been proposed as a powerful alternative. A working TFG and an appropriate power converter were developed. Transient simulation of the system with relevant disturbance influences is done efficiently. A current control is used to optimize power-feedback into the grid. Measurements show positive results.
Tranverse flux machines (TFM) have been proposed as a powerful direct drive alternative. The construction and control of TFM have often proved a problem. In this paper the construction of a working transverse flux generator is presented. Its characteristics are predicted by a detailed FE simulation. Also a current control is designed that compensates unsymmetries and maximizes the power output. Measurements...
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