METHOD AND SYSTEM FOR START AND OPERATION OF AN ELECTRICALLY DRIVEN LOAD
2 Assignments
0 Petitions
Accused Products
Abstract
A method and system for starting and operating an electrically driven load, e.g. a compressor or pump, by power supply from a mechanical driver, e.g. a turbine or combustion engine, whereby the load is mechanically connected to a first electrical machine, and the mechanical driver is mechanically connected to a second electrical machine. The first electrical machine is electrically interconnected to the second electrical machine at a standstill or when the first and or second machine have low speed. In an acceleration phase, the first electrical machine is accelerated by accelerating the second electrical machine with the mechanical driver. When the first electrical machine has reached a predefined rotational speed, the first machine is synchronized with a local electrical power network and connected it to that network.
17 Citations
46 Claims
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1-23. -23. (canceled)
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24. A method for starting and operating an electrically driven load by power supply from a mechanical driver, the method comprising:
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the load mechanically connected to a first electrical machine in a power range of 10 MW and above; said mechanical driver mechanically connected to a second electrical machine; electrically interconnecting the first electrical machine to the second electrical machine at a standstill or when at least one of the first machine and the second machine have low speed, whereby the connection of the second electrical machine is dedicated to the first electrical machine; in an acceleration phase, accelerating the first electrical machine by accelerating the second electrical machine with the mechanical driver; and when the first electrical machine has reached a predefined rotational speed, synchronizing the first electrical machine with a local electrical power network and connecting it to the network. - View Dependent Claims (26, 27, 30, 31, 32, 33)
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25. A method of starting and operating an electrically driven subsea load by power supply from a mechanical driver comprising:
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the subsea load mechanically connected to a first electrical machine; the mechanical driver mechanically connected to a second electrical machine; electrically interconnecting the first electrical machine to the second electrical machine at a standstill or when at least one of the first machine and the second machine have low speed, whereby the connection of the second electrical machine is dedicated to the first electrical machine; in an acceleration phase, accelerating the first electrical machine by accelerating the second electrical machine with the mechanical driver; and when the first electrical machine has reached a predefined rotational speed, synchronizing it with a local electrical power network and connecting it to the network.
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28. A method of starting and operating an electrically driven load driven by a first electrical machine in a power range of 10 MW and above, comprising:
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supplying power from a mechanical driver, a frequency converter receiving power from an external power network, or a local source; in an acceleration phase, accelerating the first electrical machine as a motor for said load, from zero, near zero or at low speed, by either; a) accelerating a second electrical machine connected to said mechanical driver, the second electrical machine being electrically interconnected to said first electrical machine and functioning as a generator, whereby the connection of the second electrical machine is dedicated to the first electrical machine;
orb) supplying power to the first electrical machine from said frequency converter; synchronizing the first electrical machine with a local power network; and
then after the acceleration phase, operating the first electrical machine by providing it with power from the local power network, the network is provided with power from;a) an external power network;
orb) at least one mechanical driver connected to at least one second electrical machine, thereby rendering the frequency converter available for other tasks. - View Dependent Claims (34)
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29. A method of starting and operating of an electrically driven subsea load driven by a first electrical machine, the method comprising:
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supplying power from a mechanical driver, a frequency converter receiving power from an external power network, or a local source, in an acceleration phase; accelerating the first electrical machine as a motor for said subsea load, from zero, near zero or at low speed, by either; a) accelerating a second electrical machine connected to said mechanical driver, the second electrical machine being electrically interconnected to said first electrical machine and functioning as a generator, whereby the connection of the second electrical machine is dedicated to the first electrical machine;
orb) supplying power to the first electrical machine from said frequency converter; synchronizing the first electrical machine with a local power network; and
then after the acceleration phase, operating the first electrical machine by providing it with power from the local power network, which network is provided with power from;a) an external power network;
orb) at least one mechanical driver connected to at least one second electrical machine; thereby rendering the frequency converter available for other tasks.
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35. A start and operation system for the starting and operating of at least one mechanical load;
- the system comprising;
the load connected to and driven by at least one first electrical machine in a power range of 10 MW and above; power to the first electrical machine is provided with a mechanical driver which is mechanically connected to a second electrical machine functioning as a generator; the second electrical machine adapted to be uniquely connected to said first electrical machine or a plurality of first electrical machines, whereby the system is adapted to accelerate said first electrical machine(s) by controlled delivery of power from the second electrical machine to the first electrical machine. - View Dependent Claims (39, 40, 41, 43, 44, 45, 46)
- the system comprising;
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36. A start and operation system for the starting and operating of at least one mechanical subsea load, the system comprising:
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the subsea load connected to and driven by at least one first electrical machine; power to the first electrical machine provided with a mechanical driver which is mechanically connected to a second electrical machine functioning as a generator; the second electrical machine adapted to be uniquely connected to said first electrical machine or a plurality of first electrical machines, whereby the system is adapted to accelerate said first electrical machine(s) by controlled delivery of power from the second electrical machine to the first electrical machine.
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37. A start and operation system for the starting and operating of at least one mechanical load, the system comprising:
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the load connected to and driven by at least one first electrical machine in the power range of 10 MW and above; a mechanical driver connected to a second electrical machine, the second electrical machine adapted to be uniquely electrically connected to one or more first electrical machines, thereby working as a generator during an acceleration phase or a succeeding operation phase; a frequency converter adapted to be uniquely connected to one or more first electrical machines, thereby accelerating said first electrical machine in an acceleration phase or operating the first electrical machine in an operation phase; and the frequency converter adapted to be provided with power from either an external power network or a local power network. - View Dependent Claims (42)
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38. A start and operation system for the start and operation of at least one mechanical subsea load, the system comprising:
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the subsea load connected to and driven by at least one first electrical machine; a mechanical driver connected to a second electrical machine, the second electrical machine adapted to be uniquely electrically connected to one or more first electrical machines, thereby working as a generator during an acceleration phase or a succeeding operation phase; a frequency converter, adapted to be uniquely connected to one or more first electrical machines, thereby accelerating said first electrical machine in an acceleration phase or operating the first electrical machine in an operation phase; and the frequency converter adapted to be provided with power from either an external power network or a local power network.
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Specification