# US 11,444,609 B2 · Mobile hybrid electric power system

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- Number: US 11,444,609 B2
- Document ID: US11444609B2
- Status: Granted
- Kind: B2
- Application number: 15/929,473
- Filed: 2020-05-04
- Published: 2021-11-04
- Granted: 2022-09-13
- Earliest claimed: 2020-05-04
- Assignees: Raytheon Company
- Applicants: Raytheon Company
- Inventors: Stephen B. Kuznetsov; Eric J. Stich
- Web page: https://patentgrep.com/patent/US11444609B2

## CPC

- H02J 11/00: Circuit arrangements for providing service supply to auxiliaries of stations in which electric power is generated, distributed or converted
- H03K 3/45: by the use, as active elements, of non-linear magnetic or dielectric devices
- H02J 3/32: using batteries or super capacitors with converting means
- H02J 3/38: Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel
- H02J 7/34: Parallel operation in networks using both storage and other DC sources, e.g. providing buffering (H02J7/14 takes precedence)
- H02J 15/00: Systems for storing electric energy specially adapted for power networks
- H02K 17/30: Structural association of asynchronous induction motors with auxiliary electric devices influencing the characteristics of the motor or controlling the motor, e.g. with impedances or switches
- H02K 17/42: Asynchronous induction generators (H02K17/02 takes precedence)
- H02P 9/08: Control of generator circuit during starting or stopping of driving means, e.g. for initiating excitation
- Y02E 60/16: Mechanical energy storage, e.g. flywheels or pressurised fluids
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M)
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A system includes a prime mover configured to rotate a shaft. The system also includes a wound rotor induction generator (WRIG). The WRIG includes a rotor coupled to the shaft of the prime mover and configured to rotate when the shaft rotates, where the rotor includes a rotor winding. The WRIG also includes a stator winding electrically connected to a utility source and a load. When the stator winding receives first power from the utility source, the WRIG is configured to transform at least one of a voltage and a frequency of the first power before outputting at least a portion of the first power to the load. When the stator winding does not receive the first power from the utility source, the WRIG is configured to generate second power due to kinetic energy of the rotor and output at least a portion of the second power to the load.

## Claims

### Claim 1

A system comprising:
a prime mover configured to rotate a shaft; and
a wound rotor induction generator (WRIG) comprising:
a rotor coupled to the shaft of the prime mover and configured to rotate when the shaft rotates, the rotor comprising a rotor winding; and
a stator winding electrically connected to a utility source and a load;
wherein:
when the stator winding receives first power from the utility source, the WRIG is configured to transform at least one of a voltage and a frequency of the first power before outputting at least a portion of the first power to the load; and
when the stator winding does not receive the first power from the utility source, the WRIG is configured to generate second power due to kinetic energy of the rotor, and output at least a portion of the second power to the load.

### Claim 2 (depends on 1)

The system of claim 1, further comprising:
an energy storage bank electrically connected to the stator winding, the energy storage bank configured to:
receive a second portion of the first power from the WRIG;
store the second portion of the first power while the WRIG is receiving the first power from the utility source;
receive a second portion of the second power from the WRIG; and
store the second portion of the second power while the WRIG is generating the second power.

### Claim 3 (depends on 2)

The system of claim 2, further comprising:
a rectifier configured to rectify the first power and the second power from alternating current (AC) to direct current (DC) before the second portion of the first and second powers are received at the energy storage bank; and
an inverter configured to convert third power from the rectifier or the energy storage bank from DC to AC.

### Claim 4 (depends on 3)

The system of claim 3, wherein the inverter is further configured to convert a frequency of the third power to any of multiple frequencies suitable for the load.

### Claim 5 (depends on 4)

The system of claim 4, wherein the rectifier, the energy storage bank, and the inverter are configured to electrically isolate the load during a transition between the first power and the second power.

### Claim 6 (depends on 1)

The system of claim 1, wherein the stator winding of the WRIG comprises multiple taps configured to transform the voltage of the first power to any of multiple voltage levels for the utility source which is either single-phase or polyphase.

### Claim 7 (depends on 1)

The system of claim 1, further comprising:
a rotor excitation power supply electrically connected to the rotor winding and configured to excite the rotor when the WRIG transitions between receiving the first power from the utility source and generating the second power.

### Claim 8 (depends on 1)

The system of claim 1, further comprising:
a switch electrically connected between the stator winding and the utility source and configured to switch out the utility source from the stator winding.

### Claim 9 (depends on 1)

The system of claim 1, wherein the system is configured to transition from the utility source to the WRIG within one electrical cycle in a manner that is transparent to the load.

### Claim 10

A system comprising:
a prime mover configured to rotate a shaft; and
a wound rotor induction generator (WRIG) comprising:
a rotor coupled to the shaft of the prime mover and configured to rotate when the shaft rotates, the rotor comprising a rotor winding;
a first stator winding electrically connected to a utility source and a load; and
a second stator winding electrically connected to an energy storage bank;
wherein:
when the first stator winding receives first power from the utility source, the WRIG is configured to transform at least one of a voltage and a frequency of the first power before outputting at least a portion of the first power to the load; and
when the first stator winding does not receive the first power from the utility source, the WRIG is configured to generate second power through the second stator winding due to kinetic energy of the rotor, and output at least a portion of the second power to the load.

### Claim 11 (depends on 10)

The system of claim 10, wherein:
the WRIG is configured to output a second portion of the first power to the energy storage bank, and
the energy storage bank is configured to store the second portion of the first power for use when the WRIG transitions between receiving the first power from the utility source and generating the second power.

### Claim 12 (depends on 11)

The system of claim 11, further comprising:
a rectifier configured to rectify the second portion of the first power from alternating current (AC) to direct current (DC) before the second portion is received at the energy storage bank; and
an inverter configured to convert third power from the rectifier or the energy storage bank from DC to a controllable frequency AC power.

### Claim 13 (depends on 12)

The system of claim 12, wherein the inverter is bidirectional in power and current flow and is configured to allow load energy to charge the energy storage bank.

### Claim 14 (depends on 10)

The system of claim 10, wherein the first stator winding comprises multiple taps configured to transform the voltage of the first power to any of multiple voltage levels.

### Claim 15 (depends on 10)

The system of claim 10, further comprising a third stator winding, wherein:
the first stator winding is fed from the utility source at a first voltage level,
the third stator winding is fed from a second utility source at a second voltage level,
the second stator winding is configured to output a second portion of the first power at a third voltage level,
the second stator winding is configured to extract energy derived from the kinetic energy of the rotor and transfer the energy to the energy storage bank, and
the second portion of the first power is subsequently rectified and used to charge the energy storage bank.

### Claim 16 (depends on 10)

The system of claim 10, further comprising:
a rotor excitation power supply electrically connected to the rotor winding and configured to excite the rotor at a controllable frequency and flux level when the WRIG transitions between receiving the first power from the utility source and generating the second power.

### Claim 17

A device comprising:
a rotor configured to be coupled to a shaft of a prime mover and rotated when the shaft rotates, the rotor comprising a rotor winding; and
at least one stator winding configured to be electrically connected to a utility source and a load;
wherein:
when the at least one stator winding receives first power from the utility source, the device is configured to transform at least one of a voltage and a frequency of the first power before outputting at least a portion of the first power to the load; and
when the at least one stator winding does not receive the first power from the utility source, the device is configured to generate second power due to kinetic energy of the rotor and output at least a portion of the second power to the load.

### Claim 18 (depends on 17)

The device of claim 17, wherein:
the at least one stator winding is further configured after rectification to be electrically connected to an energy storage bank; and
the device is configured to output a second portion of the first power to the energy storage bank that stores the second portion of the first power for use when the device transitions between receiving the first power from the utility source and generating the second power.

### Claim 19 (depends on 18)

The device of claim 18, wherein the at least one stator winding comprises:
a first stator winding electrically connected to the load and configured to provide AC power; and
a second stator winding electrically connected after rectification to the energy storage bank, wherein the rectification is bidirectional such that that excess energy stored in the energy storage bank is returnable to the device through the second stator winding.

### Claim 20 (depends on 18)

The device of claim 18, wherein:
the at least one stator winding comprises a first stator winding and a second stator winding, and the energy storage bank comprises a first energy storage bank;
the first stator winding is configured to charge the first energy storage bank;
the second stator winding is configured to charge a second energy storage bank; and
the first and second energy storage banks are configured for use on independent busses or combined to power common loads.

### Claim 21 (depends on 20)

The device of claim 20, wherein:
the first stator winding is configured to charge the first energy storage bank at a first voltage level;
the second stator winding is configured to charge the second energy storage bank at a second voltage level; and
each of the first and second energy storage banks has an independent charging and discharging time or profile.

### Claim 22 (depends on 17)

The device of claim 17, wherein the at least one stator winding comprises multiple taps configured to transform the voltage of the first power to any of multiple voltage levels.

### Claim 23 (depends on 17)

The device of claim 17, wherein excitation of the rotor has a variable frequency excitation characteristic which allows frequency to increase in direct response to rotor speed decreasing as energy is extracted from the rotor to maintain a stator output frequency and voltage nearly constant during modes when rotor energy is being extracted.