Power generation system and method with energy management

Patent metadata

Field	Value
Publication number	US-2016308361-A1
Application number	US-201615094162-A
Country	US
Kind code	A1
Filing date	Apr 8, 2016
Priority date	Apr 14, 2015
Publication date	Oct 20, 2016
Grant date	—

Abstract

A power generation system is provided. The system includes a bus, at least two converters, an energy-type energy storage unit (ES), a power-type energy storage unit (PS) and a controller. The ES and the PS are coupled in parallel to the bus through corresponding converters of the at least two converters. The controller is configured to control the ES and the PS through the corresponding converters in at least two conditions during a charging mode and a discharging mode: when a power for the ES and PS is below a power threshold, control the power to flow between the ES and the bus; and when the power is above the power threshold, control a part of the power to flow between the ES and the bus and another part of the power to flow between the PS and the bus. And a method for generating power is also provided.

First claim

1 . A system, comprising:
a bus; at least two converters; an energy-type energy storage unit (ES); a power-type energy storage unit (PS), the ES and the PS being coupled in parallel to the bus through corresponding converters of the at least two converters; and a controller configured to control the ES and the PS through the corresponding converters in at least two conditions during a charging mode and a discharging mode:
when a bus required power for the ES and PS is below a power threshold, control the bus required power to flow between the ES and the bus; and
when the bus required power is above the power threshold, control a part of the bus required power to flow between the ES and the bus and another part of the bus required power to flow between the PS and the bus.

2 . The system of claim 1 , wherein the controller is configured to control a power to flow between the ES and the PS when a voltage of the PS is out of a voltage requirement range to remain the voltage of the PS in the voltage requirement range.

3 . The system of claim 2 , wherein the controller is configured to forecast a wind speed and generate a voltage requirement for the PS according to the wind speed, and wherein the voltage requirement range is around the voltage requirement.

4 . The system of claim 3 , wherein the controller is configured to generate the voltage requirement for the PS according to a rated voltage of the PS.

5 . The system of claim 1 , wherein the controller is configured to control the part of the bus required power flowing between the ES and the bus being equal to the power threshold when the power flowing through the PS is less than a maximum PS power thereof in the condition that the bus required power for the ES and the PS is above the power threshold.

6 . The system of claim 1 , wherein the controller is configured to control the part of the bus required power flowing between the PS and the bus being equal to a maximum PS power thereof when the bus required power for the ES and the PS is higher than a sum of a maximum PS power and the power threshold in the condition that the bus required power for the ES and the PS is above the power threshold.

7 . The system of claim 1 , wherein the controller comprises a slew rate limiter configured to limit a dynamic change rate of the power flowing between the ES and the bus.

8 . The system of claim 1 , wherein the controller comprises a low-pass filter to filter the power flowing between the ES and the bus.

9 . The system of claim 1 , further comprising a power generation device configured to generate AC power.

10 . The system of claim 9 , wherein the controller is configured to generate the bus required power for the ES and the PS based on a difference between the AC power generated by the power generation device and a required power of a grid.

11 . A method, comprising:
providing an energy-type energy storage unit (ES) and a power-type energy storage unit (PS) coupled in parallel to a bus through corresponding converters; controlling the ES and the PS through the corresponding converters in at least two conditions during a charging mode and a discharging mode:
when a bus required power for the ES and PS is below a power threshold, controlling the power to flow between the ES and the bus; and
when the bus required power is above the power threshold, controlling a part of the power to flow between the ES and the bus and another part of the power to flow between the PS and the bus.

12 . The method of claim 11 , further comprising controlling a power to flow between the ES and the PS when a voltage of the PS is out of a voltage requirement range to remain a voltage of the PS in the voltage requirement range.

13 . The method of claim 12 , further comprising forecasting a wind speed and generating a voltage requirement for the PS according to the wind speed, and wherein the voltage requirement range is around the voltage requirement.

14 . The method of claim 13 , wherein the voltage requirement for the PS is generated according to a rated voltage of the PS.

15 . The method of claim 11 , wherein the part of the bus required power flowing between the ES and the bus is equal to the power threshold when power flowing through the PS is less than a maximum PS power thereof in the condition that the bus required power for the ES and the PS is above the power threshold.

16 . The method of claim 11 , wherein the part of the bus required power flowing between the PS and the bus is equal to a maximum PS power thereof when the bus required power for the ES and the PS is higher than a sum of the maximum PS power and the power threshold in the condition that the bus required power for the ES and the PS is above the power threshold.

17 . The method of claim 11 , further comprising limiting a dynamic change rate of the power flowing between the ES and the bus via a slew rate limiter.

18 . The method of claim 11 , further comprising filtering the power flowing between the ES and the bus via a low-pass filter.

19 . The method of claim 11 , further comprising generating AC power via a power generation device.

20 . The method of claim 19 , wherein the bus required power for the ES and the PS is generated based on a difference between the AC power generated by the power generation device and a required power of a grid.

Assignees

• Gen Electric

Inventors

• Zhao Tong
• Li Rong
• Fu Xu
• Landa Bernard P

Classifications

• H02J2101/28

  Wind energy · CPC title

• H02J7/865

  Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence) · CPC title

• H02M3/04

  by static converters · CPC title

• H02J7/345

  using capacitors as storage or buffering devices · CPC title

• H02J1/12

  Parallel operation of DC sources having power converters with further DC sources without power converters · CPC title