Actuating drive and emergency energy supply device
First Claim
1. An actuating drive for a rotor blade in a wind power installation, comprising:
- an electric motor;
a frequency converter that includes a rectifier capable of being supplied by a power supply system;
a link connected to the rectifier;
a d.c.-to-a.c. inverter for feeding the electric motor, wherein the link carries a specified nominal operating voltage in a network-fed normal operation of the frequency converter;
an emergency energy supply device connected to the link and including an energy store that makes available an electrical support voltage;
a diode having a forward direction and being connected between the energy store and the link, the diode being situated in such a way with respect to the forward direction that the diode feeds a support current from the energy store into the link if a link voltage falls below the support voltage, wherein;
the diode prevents a current flow between the energy store and the link if the link voltage is greater than the support voltage,the support voltage amounts to less than 80% of a nominal operating voltage of the link; and
a charging device for the energy store, a charge voltage of the charging device is less than the nominal operating voltage of the link.
1 Assignment
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Accused Products
Abstract
An actuating drive for a rotor blade in a wind power installation is provided with an electric motor and a frequency converter which has a rectifier that is to be fed from a power supply system, a link connected to the rectifier, and a d.c.-to-a.c. inverter for feeding the motor, the link carrying a specified nominal operating voltage in a network-fed normal operation of the frequency converter. Furthermore, an auxiliary energy supply device is provided that is connected to the link. The auxiliary energy supply device includes and energy store which makes available a support voltage that amounts to less than 80% of the nominal operating voltage of the link. A diode is connected between the energy store and the link, and is arranged, with regard to its forward direction, in such a way that it feeds a support voltage from the energy store into the link if the link voltage falls below the support voltage. The diode prevents a current flow between the energy store and the link if the link voltage is greater than the support voltage. A charging device for the energy store has a lower charging voltage than the nominal operating voltage of the link.
33 Citations
17 Claims
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1. An actuating drive for a rotor blade in a wind power installation, comprising:
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an electric motor; a frequency converter that includes a rectifier capable of being supplied by a power supply system; a link connected to the rectifier; a d.c.-to-a.c. inverter for feeding the electric motor, wherein the link carries a specified nominal operating voltage in a network-fed normal operation of the frequency converter; an emergency energy supply device connected to the link and including an energy store that makes available an electrical support voltage; a diode having a forward direction and being connected between the energy store and the link, the diode being situated in such a way with respect to the forward direction that the diode feeds a support current from the energy store into the link if a link voltage falls below the support voltage, wherein; the diode prevents a current flow between the energy store and the link if the link voltage is greater than the support voltage, the support voltage amounts to less than 80% of a nominal operating voltage of the link; and a charging device for the energy store, a charge voltage of the charging device is less than the nominal operating voltage of the link. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An emergency energy supply device for supplying an electrical actuating drive of a wind power installation, in an emergency operation, in response to a failure of a power supply system that supplies the actuating drive with electrical energy in normal operation, comprising:
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an energy store that includes a plurality of accumulator units connected in series, the accumulator units including 8 lithium ion accumulator units; a charging device for charging the accumulator units; a switching device by which an individual one of the accumulator units is able to be connected to the charging device, wherein the charging device is developed for charging the single accumulator unit; and a control device by which a respective charging state of an individual one of the accumulator units is able to be checked, and by which the switching device is able to be controlled as a function of a checking result. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification