Ge Energy Power Conversion Gmbh

Ge Energy Power Conversion Technology Gmbh

Piotr Sadowski

Roland Jakob

Thomas Basler

Kai Alexander Rothenhagen

Kai Alexaner Rothenhagen

A system and method of operating a pumped storage power plant using a double fed induction machine with a frequency converter in a rotor circuit is disclosed. A current target value for the rotor current frequency is determined based on a target power to be transmitted between an electrical grid and the double fed induction machine depending on measured actual operating variables. A current inadmissible synchronous deadband is determined depending on variables characterizing a current state of the pumped storage power plant. The synchronous deadband is determined by a permissible minimum required rotor current frequency or speed difference of the rotor speed from the synchronous speed for the stationary operation. The converter is controlled to generate voltages and currents with the current target value of the rotor current frequency if the current target value of the rotor current frequency or speed does not fall in the current inadmissible synchronous deadband.

System and method for operating a pumped storage power plant with a double fed induction machine

A method for operating an electrical circuit is described. The electrical circuit is equipped with a power converter () that has at least one series connection () consisting of at least four power semiconductor elements. The electrical circuit is equipped with at least one capacitor (Cd, Cd) connected in parallel to the series connection (). In the power converter (), at least one resistor has been connected in parallel to the middle two power semiconductor elements. In the method, at least one of the power semiconductor elements is conductively connected and in this way a discharging current is generated from the capacitor (Cd, Cd) through the conductively connected power semiconductor element and the resistor.

Procedures for the operation of an electrical circuit

A method for operating an electrical power rectifier. The power rectifier comprises at least two branches that are connected in parallel to each other, each of the branches comprising at least two power semiconductor elements that are connected in series. The collector-emitter voltage Vce(t) and/or the collector current Ic(t) of one of the power semiconductor elements is detected by means of the method. Furthermore, it is determined whether at least one of the following conditions is met: dVce(t)/dt&#x3c;(dVce/dt), and/or dIc(t)/dt&#x3c;(dIc/dt), and or Ic(t_ent)&#x3c;Ic. If at least one of the aforementioned conditions has been met, the gate-emitter voltage of at least one of the power semiconductor elements is increased.

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Berlin, Germany

Piotr Sadowski