Inertial energy storage system and hydro-fluoro-ether power transformer scheme for radar power systems and large PFN charging

Patent metadata

Field	Value
Publication number	US-9531247-B2
Application number	US-201414245754-A
Country	US
Kind code	B2
Filing date	Apr 4, 2014
Priority date	Apr 4, 2014
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

A multi-port storage system includes a dynamo-electric machine with integral rotor inertia forming a primary energy storage system. The dynamo-electric machine has a primary stator winding configured to accept multiple AC input power sources, and has at least two secondary stator windings configured to deliver electric power to multiple loads at different power, frequency and voltage levels. A secondary energy storage system is coupled to the primary energy storage system, and is configured to convert its stored energy to electric power. The dynamo-electric machine is configured to enhance and buffer the secondary energy storage system, and is configured to improve the conversion of the stored energy to electric power. The system may include a step-up transformer responsively coupled to one of the secondary stator windings. The step-up transformer may comprise a single phase or polyphase step-up transformer having internal cooling and electrical insulation between the secondary windings comprising a hydro-fluoro-ether (HFE) vapor and liquid fluid.

First claim

What is claimed is:

1. A multi-port storage system, comprising:
a dynamo-electric machine with integral rotor inertia forming a primary energy storage system, the dynamo-electric machine having (i) multiple primary stator windings configured to accept multiple AC inputs from multiple power sources and (ii) at least two secondary stator windings configured to deliver electric power to multiple loads at different power, frequency and voltage levels;
a secondary energy storage system configured to store energy and coupled to the primary energy storage system, the secondary energy storage system configured to convert stored energy to electric power and to convert electric power to stored energy; and
wherein the dynamo-electric machine is configured to buffer the secondary energy storage system and to adjust one or more charging or discharging rates of the secondary energy storage system.

2. The system as specified in claim 1 , further comprising a step-up transformer coupled to one of the secondary stator windings.

3. The system as specified in claim 2 , wherein the step-up transformer comprises a single-phase or polyphase step-up transformer having internal cooling and electrical insulation between the secondary stator windings comprising a hydro-fluoro-ether (HFE) vapor and liquid fluid.

4. The system as specified in claim 1 , further comprising a power electronic frequency or voltage level converter coupled to the dynamo-electric machine, the converter cooled and insulated by a hydro-fluoro-ether (HFE) vapor and liquid fluid.

5. The system as specified in claim 1 , wherein the primary stator windings and the secondary stator windings of the dynamo-electric machine are cooled and insulated by a hydro-fluoro-ether (HFE) liquid fluid.

6. The system as specified in claim 2 , wherein the step-up transformer, a power electronic frequency or voltage level converter, and the stator windings of the dynamo-electric machine are cooled by a hydro-fluoro-ether (HFE) vapor and liquid fluid in a common cooling loop, wherein the HFE fluid is configured to transform from a fluid state to a vapor state in a last stage of use.

7. The system as specified in claim 1 , wherein the dynamo-electric machine has a plurality of excitation windings, wherein a first of the excitation windings is configured for normal excitation of one or more steady-state loads and a second of the excitation windings is configured for pulsed excitation to power one or more rapidly changing or transient loads.

8. The system as specified in claim 3 , wherein the step-up transformer has a primary winding and a plurality of secondary windings disposed about a common segmented core, wherein the HFE vapor and liquid fluid is disposed between sections of the segmented core.

9. The system as specified in claim 1 , wherein the dynamo-electric machine further includes a tertiary excitation stator winding configured to provide a fast ramp rate for output power provided by the dynamo-electric machine, wherein the tertiary excitation stator winding of the dynamo-electric machine is configured to be excited by a polyphase system of pulse forming networks from a DC source.

10. The system as specified in claim 1 , wherein the dynamo-electric machine comprises:
a first inertial flywheel and a second inertial flywheel; and
a first drive motor and a second drive motor configured to power the first inertial flywheel and the second inertial flywheel, respectively; and
wherein the first drive motor and the second drive motor are electrically connected in series to equalize torque provided to the first inertial flywheel and the second inertial flywheel.

11. The system as specified in claim 10 , further comprising a variable frequency drive (VFD) configured to convert a first frequency to a second higher frequency and feed the first drive motor and the second drive motor.

12. The system as specified in claim 10 , wherein the first drive motor and the second drive motor are configured to:
counter-rotate the first inertial flywheel and the second inertial flywheel, respectively; and
operate the primary energy storage system so that speeds of the counter-rotating inertial flywheels are kept in synchronism.

13. The system as specified in claim 1 , wherein the secondary energy storage system is configured to recover load energy.

14. The system as specified in claim 13 , wherein:
the primary energy storage system is configured to recover a first portion of the load energy;
the secondary energy storage system is configured to recover a second portion of the load energy; and
the first portion represents a majority of the load energy.

15. The system as specified in claim 3 , further comprising a heat exchanger/condenser configured to process the HFE vapor and liquid fluid.

16. The system as specified in claim 1 , wherein the primary stator windings of the dynamo-electric machine are configured to accept the multiple AC inputs from the multiple power sources simultaneously.

17. The system as specified in claim 1 , wherein different segments of the primary stator windings are configured to accept different phases of the AC inputs or different voltage levels from the multiple power sources.

18. The system as specified in claim 1 , wherein the dynamo-electric machine comprises a wound-field synchronous electrical machine.

19. A multi-port energy storage system, comprising:
two or more energy storage devices having different time constants and different rates of energy delivery/energy recovery;
a converter configured to step-up an AC voltage level of each of the energy storage devices and create an AC output voltage that is galvanically isolated from an input source;
a rectifier configured to rectify the AC output voltage to a higher voltage DC voltage;
a control system having excitation systems and configured to transfer control from a low response mode to a high response mode in order to change at least one of the excitation systems from a slow response field exciter to a fast response field exciter; and
a limiter configured to limit electrical fault energy in the AC output voltage and a DC output voltage.

20. The system as specified in claim 19 , wherein the excitation systems comprise:
a DC slow response field exciter configured to power a rotating DC field winding; and
a supplemental fast response exciter configured to be responsive to a pulse forming network (PFN) and configured to power a tertiary polyphase winding located on a dynamo-electric machine stator to aid in fast output control.

21. The system as specified in claim 20 , wherein excitation power of the fast response exciter is configured to be derived from an output or load energy and used in a regenerative circuit.

22. The system as specified in claim 21 , wherein the excitation power of the fast response exciter is configured to be derived from a DC storage source comprising a polyphase system of excitation formed by sequential firing of switches.

23. The system as specified in claim 22 , wherein the switches comprise power electronic switches.

Assignees

• Raytheon Co

Inventors

• Kuznetsov Stephen

Classifications

• H02K7/025

  for power storage · CPC title

• H02K47/22 Primary

  Single-armature frequency converters with or without phase-number conversion · CPC title

• H02P25/22 Primary

  Multiple windings; Windings for more than three phases · CPC title

• H02P9/14

  by variation of field (H02P9/08, H02P9/10 take precedence) · CPC title

• H01F27/18

  by evaporating liquids · CPC title