System and method for parallel configuration of hybrid energy storage module

Patent metadata

Field	Value
Publication number	US-9667232-B2
Application number	US-201514711632-A
Country	US
Kind code	B2
Filing date	May 13, 2015
Priority date	May 13, 2015
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

A hybrid energy storage system is configured to control pulsed power. A first dynamo-electric machine is coupled to an inertial energy storage device and has multiple input stator windings configured to accept input power from a source. A polyphase output stator winding is configured to deliver electric power having a first response time to a DC bus. A secondary energy storage system is coupled to the DC bus and is configured to convert its stored energy to electric power in a bidirectional manner. A second dynamo-electric machine has an input stator winding and at least one polyphase output stator winding coupled to a converter, the converter coupled to a DC output. A polyphase boost exciter is configured to derive energy from the DC bus and excite the second machine tertiary stator winding, wherein the second machine is configured to be excited at a faster rate than the first response time of the first machine.

First claim

What is claimed is:

1. A system, comprising:
an inertial and electro-chemical combined energy storage system;
a first dynamo-electric machine configured to act as a prime mover, the first dynamo-electric machine having output stator windings configured to produce alternating current (AC) power, a rotor winding configured to be excited by an exciter, and at least one polyphase output stator winding with rectification to deliver electric power at a first rate to a bus;
a secondary energy storage system coupled to the bus and configured to exchange electrical energy in a bidirectional manner;
a second dynamo-electric machine, the first dynamo-electric machine electrically coupled to the second dynamo-electric machine through an electrical reactor, the second dynamo-electric machine coupled to the inertial and electro-chemical combined energy storage system and to a third dynamo-electric machine, the third dynamo-electric machine coupled to the inertial and electro-chemical combined energy storage system and configured to impart kinetic energy to and extract kinetic energy from the inertial and electro-chemical combined energy storage system, the second dynamo-electric machine having a multi-port stator winding, a wound-rotor with a polyphase winding for excitation, and at least one polyphase output stator winding coupled to an AC/direct current (DC) power converter, the power converter coupled to a DC output configured to couple to a pulsed load device; and
a polyphase boost exciter configured to derive energy from either an AC bus or a DC bus and to excite a second dynamo-electric machine tertiary stator winding, wherein the second dynamo-electric machine is configured to be electrically excited at a second rate that is faster than the first rate in order to feed loads with fast rise times or having rapidly changing terminal impedances.

2. The system as specified in claim 1 , wherein the secondary energy storage system comprises an electro-chemical battery.

3. The system according to claim 1 , wherein the at least one polyphase output stator winding of the second dynamo-electric machine is configured to deliver fast pulses of electrical energy to the pulsed load device at a plurality of power, duty-cycle, and voltage levels.

4. The system according to claim 1 , wherein the system is configured to bi-directionally transfer energy between the DC output, the secondary energy storage system, the inertial and electro-chemical combined energy storage system, and the first dynamo-electric machine.

5. The system according to claim 1 , further comprising the electrical reactor positioned in between the first and second dynamo-electric machines, the electrical reactor configured to segregate the first dynamo-electric machine from fast rising pulses or oscillating power profiles operating at the second dynamo-electric machine whilst feeding the pulsed load device.

6. The system according to claim 5 , further comprising an electrical polyphase saturable reactor that is controllable by a level of applied DC bias to each of one or more magnetic cores, the level of applied DC bias responsive to at least one of: a load current, an output pulse current, or an output power.

7. The system according to claim 5 , wherein the second dynamo-electric machine has a plurality of electrical excitation schemes providing both slowly rising and fast rising output power according to a load demand, the second dynamo-electric machine having a combination of low-impedance and high-impedance polyphase windings configured to produce low-voltage and high-voltage outputs, respectively.

8. The system according to claim 7 , wherein the second dynamo-electric machine has a lower transient and sub-transient electrical reactance than the first dynamo-electric machine, thereby diverting a majority of pulsed or transient load current away from the first dynamo-electric machine and reducing an impact of pulse loading on the first dynamo-electric machine.

9. The system according to claim 8 , wherein a combination of the second dynamo-electric machine and the third dynamo-electric machine form a network of low electrical impedance to transmit and recover fast rising electrical energy and of substantially lower impedance as compared to the first dynamo-electric machine or the bus.

10. The system according to claim 8 , wherein a combination of the second dynamo-electric machine, the third dynamo-electric machine, and the inertial and electro-chemical combined energy storage system form a network with a natural mechanical frequency that is less than a system electrical operating frequency and that avoids electro-mechanical resonances whilst operating the pulsed load device.

11. The system according to claim 10 , wherein the second dynamo-electric machine includes (i) one polyphase AC winding connected to the first dynamo-electric machine or the bus through the electrical reactor and (ii) a plurality of polyphase AC windings connected to a plurality of loads comprising both steady-state loads and pulsed loads.

12. The system according to claim 11 , wherein the second dynamo-electric machine is configured to transfer incoming AC polyphase power from the first dynamo-electric machine coupled to one stator winding across a machine airgap, magnetize at least one polyphase rotor winding, and transfer power to a converter system connected to a battery energy storage system.

13. The system according to claim 12 , wherein the converter system is a bi-directional converter that allows for battery charging power flow and for the battery energy storage system to provide excitation power to the second dynamo-electric machine, the battery charging power flow comprising a combination of power from the first dynamo-electric machine and inertial energy imparted to a rotor of the third dynamo-electric machine.

14. The system according to claim 1 , further comprising a control system, the control system comprising:
an outer speed energy controller loop;
an inner current regulating loop; and
an innermost voltage controller configured to direct gating pulses to a power electronic motor drive for regulation of overall system energy.

15. The system according to claim 1 , further comprising an excitation controller configured to control synchronous and asynchronous mode of operation of a wound-rotor dynamo-electric machine.

16. The system according to claim 1 , further comprising:
a parallel multi-loop control scheme of an outer loop voltage controller and outer loop current controller;
a switch configured to switch between the outer loop voltage controller and the outer loop current controller; and
an inner voltage controller configured to control power electronic switching devices used for battery source regulation to a particular load.

17. The system according to claim 1 , wherein the second dynamo-electric machine is connected to a zig-zag phase-shift transformer configured to increase a number of output phases to provide a high pulse number for rectification to a DC output bus.

18. The system according to claim 1 , further comprising a plurality of energy storage sets configured to operate in unison to feed a common load, wherein the first and second dynamo-electric machines are maintained in synchronization by common frequency connection on at least one stator port including a controller configured to coordinate rotor excitation variable frequency drives in unison.

19. The system according to claim 1 , further comprising:
a regenerative motor drive;
a DC power filter; and
a dynamic braking resistor confi

Assignees

• Raytheon Co

Inventors

• Kuznetsov Stephen B

Classifications

• Y02E60/16

  Mechanical energy storage, e.g. flywheels or pressurised fluids · CPC title

• H03K3/53 Primary

  by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback (H03K3/335 takes precedence) · CPC title

• H02J3/30

  using dynamo-electric machines coupled to flywheels · CPC title

• H03K5/00

  Manipulating of pulses not covered by one of the other main groups of this subclass (circuits with regenerative action H03K3/00, H03K4/00; by the use of non-linear magnetic or dielectric devices H03K3/45) · CPC title

• H02J2105/31

  for ships or vessels · CPC title