Method of operating an internal combustion engine connected to an electric generator

Patent metadata

Field	Value
Publication number	US-9926862-B2
Application number	US-201414527210-A
Country	US
Kind code	B2
Filing date	Oct 29, 2014
Priority date	Oct 30, 2013
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

A method involves operating an internal combustion engine connected to an electric generator, in particular a synchronous generator, during a network fault, in particular during an electric short-circuit, in a power supply network connected to the generator. A mechanical power delivered by the internal combustion engine is introduced into the generator and converted into electric power in the generator. The electric power is delivered to the power supply network, and the mechanical power delivered by the internal combustion engine is at least temporarily increased depending on the value of at least one operating parameter of the generator and/or the internal combustion engine prior to the network fault and/or during the network fault, preferably by an amount of a fuel introduced into the internal combustion engine being increased.

First claim

The invention claimed is:

1. A method of operating an internal combustion engine connected to an electric generator by a coupling device during a network fault in a power supply network connected to the generator so as to counteract effects of back-swing, said method comprising:
introducing a mechanical power generated by the internal combustion engine into the generator, and converting the mechanical power into electric power in the generator;
delivering the electric power to the power supply network;
temporarily increasing the mechanical power generated by the internal combustion engine depending on a value of at least one operating parameter of at least one of the generator and the internal combustion engine prior to the network fault or during the network fault so as to counteract any drop in rotary speed occurring during the back-swing; and
detecting a rotary speed of at least one of the generator and the coupling device and the internal combustion engine prior to the network fault as the operating parameter, said temporarily increasing the mechanical power comprising increasing an amount of the fuel introduced into the internal combustion engine depending on the detected rotary speed prior to the network fault.

2. The method as set forth in claim 1 , further comprising introducing fuel into the internal combustion engine by at least one fuel metering device.

3. The method as set forth in claim 2 , wherein said temporarily increasing the mechanical power comprises increasing an amount of the fuel introduced into the internal combustion engine by adjusting at least one of an open position and an open time of the at least one fuel metering device.

4. The method as set forth in claim 2 , wherein the at least one fuel metering device is a port injection valve.

5. The method as set forth in claim 1 , wherein the generator has an inertia constant of less than or equal to 1.5 Ws/VA.

6. A method of operating an internal combustion engine connected to an electric generator during a network fault a power supply network connected to the generator so as to counteract effects of back-swing, said method comprising:
introducing a mechanical power generated by the internal combustion engine into the generator, and converting the mechanical power into electric power in the generator;
delivering the electric power to the power supply network;
temporarily increasing the mechanical power generated by the internal combustion engine depending on a value of at least one operating parameter of at least one of the generator and the internal combustion engine prior to the network fault or during the network fault so as to counteract any drop in rotary speed occurring during the back-swing; and
detecting the electric power delivered to the power supply network by the generator prior to the network fault as an operating parameter, said temporarily increasing the mechanical power comprising increasing an amount of the fuel introduced into the internal combustion engine depending on the detected electric power delivered to the power supply network by the generator prior to the network fault.

7. The method as set forth in claim 6 , wherein the amount of the fuel introduced into the internal combustion engine is substantially proportional to a difference in the delivered electric power prior to the network fault in relation to a predeterminable reference value.

8. The method as set forth in claim 7 , wherein the predeterminable reference value is a rated power.

9. A method of operating an internal combustion engine connected to an electric generator by a coupling device during a network fault in a power supply network connected to the generator so as to counteract effects of back-swing, said method comprising:
introducing a mechanical power generated by the internal combustion engine into the generator, and converting the mechanical power into electric power in the generator;
delivering the electric power to the power supply network;
temporarily increasing the mechanical power generated by the internal combustion engine depending on a value of at least one operating parameter of at least one of the generator and the internal combustion engine prior to the network fault or during the network fault so as to counteract any drop in rotary speed occurring during the back-swing; and
detecting a transient rotary speed of at least one of the generator and the coupling device and the internal combustion engine as the operating parameter during the network fault, said temporarily increasing the mechanical power comprising increasing an amount of the fuel introduced into the internal combustion engine substantially proportionally to a difference in the detected transient rotary speed relative to a rotary speed prior to the network fault.

10. A method of operating an internal combustion engine connected to an electric generator by a coupling device during a network fault in a power supply network connected to the generator so as to counteract effects of back-swing, said method comprising:
introducing a mechanical power generated by the internal combustion engine into the generator, and converting the mechanical power into electric power in the generator;
delivering the electric power to the power supply network;
temporarily increasing the mechanical power generated by the internal combustion engine depending on a value of at least one operating parameter of at least one of the generator and the internal combustion engine prior to the network fault or during the network fault so as to counteract any drop in rotary speed occurring during the back-swing; and
detecting a change in rotary speed of at least one of the generator and the coupling device and the internal combustion engine as the operating parameter during the network fault, said temporarily increasing the mechanical power comprising increasing an amount of fuel introduced into the internal combustion engine depending on a magnitude of the detected change in rotary speed.

11. A method of operating an internal combustion engine connected to an electric generator during a network fault in a power supply network connected to the generator so as to counteract effects of back-swing, said method comprising:
introducing a mechanical power generated by the internal combustion engine into the generator, and converting the mechanical power into electric power in the generator;
delivering the electric power to the power supply network;
temporarily increasing the mechanical power generated by the internal combustion engine depending on a value of at least one operating parameter of at least one of the generator and the internal combustion engine prior to the network fault or during the network fault so as to counteract any drop in rotary speed occurring during the back-swing; and
detecting a torque at at least one of an engine shaft of the internal combustion engine and a rotor shaft of the generator as the operating parameter during the network fault, said temporarily increasing the mechanical power comprising increasing an amount of the fuel introduced into the internal combustion engine depending on the detected torque.

12. A method of operating an internal combustion engine connected to an electric generator during a network fault in a power supply network connected to the generator so as to counteract effects of back-swing, said method comprising:
introducing a mechanical power generated by the internal combustion engine into the generator, and converting the mechanical power into electric power in the generator;
delivering the electric power to the power supply network;
temporarily increasing the mechanical power generated by the internal combustion e

Assignees

• Ge Jenbacher Gmbh & Co Og

Inventors

• Gomez Jose
• Kopecek Herbert
• Kruckenhauser Erich
• Schaumberger Herbert

Classifications

• H02P9/04 Primary

  Control effected upon non-electric prime mover and dependent upon electric output value of the generator · CPC title

• F02D41/36

  with means for controlling distribution · CPC title

• H02P9/102

  for limiting effects of transients · CPC title

• F02D2041/2093

  detecting short circuits · CPC title

• F02D2200/1012

  Engine speed gradient · CPC title