EP0917270A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Power flow control and power recovery with rotary transformers
Assignee: General Electric Co
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Filing: 1998-11-11
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Granted: —
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Expires: 2018-11-11
Abstract
Abstract An interconnection system (100) for transferring power between a first grid (22) operating at a first electrical frequency and a second grid (24) operating at a second electrical frequency includes a rotary transformer (102) and a power recovery system (103). The power recovery system (103) recovers and applies to the transferee grid a power differential attributable to mechanical power channeled to a rotatable shaft (113) of the rotary transformer (102).
Inventors
- 👤 Einar Vaughn Larsen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 14:15
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/18; H02J3/1821; H02J3/1828; H01; H01F; H01F38/00; H01F38/18; H02J3/34; H02K; H02K47/00; H02K47/18; H02K47/22; H02P; H02P9/00; H02P9/48; H02P2101/00; H02P2101/10; Y; Y02; Y02E; Y02E40/00; Y02E40/30
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
191 words
A system for transferring power between a first grid and a
second grid, the first grid operating at a first power wattage and a first
electrical frequency and the second grid operating at a second
electrical frequency, the system comprising: a rotary transformer having a first winding and a second
winding, the rotary transformer further having a rotatable shaft and a
drive motor for rotationally driving the rotatable shaft; the first winding being connected to the first grid and having the
first electrical frequency applied thereto, the second winding being
connected to the second grid and being at the second electrical
frequency, a second power wattage being generated through an
electromagnetic coupling of the first winding and the second winding
at the rotary transformer, the second power wattage being different
than the first power wattage; and a power recovery system connected to the rotary transformer for
obtaining recovered power from the rotating shaft and for adding at
least some of the recovered power to the second power wattage for
application to the second grid, the power recovery system comprising a
power-electronic control connected between the drive motor and the
second grid.
Claim 2
Dependent Claim
29 words
The system of claim 1, wherein the number of poles is
twenty, the rotational speed of the rotatable shaft is 300 rpm, and the
second electrical frequency is 50Hz.
Claim 3
Independent Claim
219 words
A system for transferring power between a first grid and a
second grid, the first grid operating at a first power wattage and a first
electrical frequency and the second grid operating at a second
electrical frequency, the system comprising: a rotary transformer having a first winding and a second
winding, the rotary transformer further having a rotatable shaft and a
drive motor for rotationally driving the rotatable shaft; the first winding being connected to the first grid and having the
first electrical frequency applied thereto, the second winding being
connected to the second grid and being at the second electrical
frequency, a second power wattage being generated through an
electromagnetic coupling of the first winding and the second winding
at the rotary transformer, the second power wattage being different
than the first power wattage; and a power recovery system connected to the rotary transformer for
obtaining recovered power from the rotating shaft and for adding at
least some of the recovered power to the second power wattage for
application to the second grid, the power recovery system comprising a
line connected from the drive motor to the second grid, and wherein a
number of poles on the drive motor is selected such that a rotational
speed of the rotatable shaft corresponds to the frequency of the second
grid.
Claim 4
Dependent Claim
29 words
The system of claim 3, wherein the number of poles is
twenty, the rotational speed of the rotatable shaft is 300 rpm, and the
second electrical frequency is 50Hz.
Claim 5
Dependent Claim
51 words
The system of claim 3, wherein the drive motor is an
induction machine, and wherein power transfer between the first grid
and the second grid varies in proportion to the difference of the first
electrical frequency and the second electrical frequency in accordance
with a torque-slip characteristic of the drive motor
Claim 6
Dependent Claim
19 words
The system of claim 5, wherein a different number of poles in
the drive motor directionally biases power transfer.
Claim 7
Independent Claim
206 words
A system for transferring power between a first grid and a
second grid, the first grid operating at a first power wattage and a first
electrical frequency and the second grid operating at a second
electrical frequency, the system comprising: a rotary transformer having a first winding and a second
winding, the rotary transformer further having a rotatable shaft and a
drive motor for rotationally driving the rotatable shaft; the first winding being connected to the first grid and having the
first electrical frequency applied thereto, the second winding being
connected to the second grid and being at the second electrical
frequency, a second power wattage being generated through an
electromagnetic coupling of the first winding and the second winding
at the rotary transformer, the second power wattage being different
than the first power wattage; and a power recovery system connected to the rotary transformer for
obtaining recovered power from the rotating shaft and for adding at
least some of the recovered power to the second power wattage for
application to the second grid, the power recovery system comprising
an ac exciter connected between the drive motor and a polyphase set
of field windings, the polyphase set of field windings being connected
to the second grid.
Claim 8
Dependent Claim
26 words
The system of claim 7, wherein the drive motor has eighteen
poles, and wherein the ac exciter supplies 5Hz to the polyphase set of
field windings.
Claim 9
Independent Claim
131 words
A method of transferring power from a first grid operating at
a first electrical frequency and a first power wattage to a second grid
operating at a second electrical frequency, the method comprising: applying the first electrical frequency to a first winding of a
rotary transformer and obtaining a second power wattage at a second
winding of the rotary transformer, the second power wattage being
different than the first power wattage; recovering, from a drive motor of a rotating shaft of the rotary
transformer, power from rotation of the rotating shaft; providing a number of poles on the drive motor such that
rotational speed on the rotatable shaft corresponds to the frequency of
the second grid; and adding the recovered power to the second grid for augmenting
the second power wattage.
Claim 10
Dependent Claim
65 words
The method of claim 9, wherein the step of recovering
power from the rotation of the rotating shaft includes using an
induction machine as the drive motor, and wherein power transfer
between the first grid and the second grid varies in proportion to the
difference of the first electrical frequency and the second electrical
frequency in accordance with a torque-slip characteristic of the drive
motor.
Claim 11
Dependent Claim
19 words
The method of claim 10, wherein a different number of
poles in the drive motor directionally biases power transfer.
Claim 12
Independent Claim
133 words
A method of transferring power from a first grid operating
at a first electrical frequency and a first power wattage to a second grid
operating at a second electrical frequency, the method comprising: applying the first electrical frequency to a first winding of a
rotary transformer and obtaining a second power wattage at a second
winding of the rotary transformer, the second power wattage being
different than the first power wattage; recovering, from a drive motor of a rotating shaft of the rotary
transformer, power from rotation of the rotating shaft; adding the recovered power to the second grid for augmenting
the second power wattage; wherein the step of recovering power from the rotation of the
rotating shaft includes using a power-electronic control system
connected between the drive motor and the second grid.
Claim 13
Independent Claim
152 words
A method of transferring power from a first grid operating
at a first electrical frequency and a first power wattage to a second grid
operating at a second electrical frequency, the method comprising: applying the first electrical frequency to a first winding of a
rotary transformer and obtaining a second power wattage at a second
winding of the rotary transformer, the second power wattage being
different than the first power wattage; recovering, from a drive motor of a rotating shaft of the rotary
transformer, power from rotation of the rotating shaft; adding the recovered power to the second grid for augmenting
the second power wattage; wherein the step of recovering power from the rotation of the
rotating shaft includes using an ac exciter connected to the drive motor,
the ac exciter being connected to a polyphase set of field windings, the
polyphase set of field windings being connected to the second grid.
References Cited (Backward Citations)
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