Real-time power distribution method and system for lithium battery and redox flow battery energy storage systems hybrid energy storage power station

Patent metadata

Field	Value
Publication number	US-10036778-B2
Application number	US-201214370032-A
Country	US
Kind code	B2
Filing date	Dec 11, 2012
Priority date	Dec 31, 2011
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

The invention provides a lithium battery and redox flow battery energy storage systems hybrid energy storage power station real-time power distribution method and system. The system comprises a communication module, a data storage and management module, a gross power coordination control module and a real-time power distribution module. The said method and system not only can complete the real-time distribution of each battery energy storage units in the battery energy storage station, but also the aims of effective control and distribution of the lithium-liquid flow cell combined energy storage power station and aims of effective control and distribution of the lithium-flow flow joint energy storage power station real-time power can be achieved.

First claim

What is claimed is:

1. A real-time power distribution method for a lithium battery and redox flow battery hybrid energy storage power station, the said lithium battery and redox flow battery hybrid energy storage station comprising a lithium battery energy storage sub-station and a redox flow battery energy storage sub-station, wherein the lithium battery energy storage sub-station comprises bidirectional converter and lithium battery energy storage units, the redox flow battery energy storage sub-station comprises bidirectional converter and redox flow battery energy storage units, the real-time power distribution method includes the following steps:
A, reading and storing energy storage power station total active real-time demand value and battery station running real-time data;
B, according to the total active real-time demand value and running real-time data being read from Step A, calculating, using at least one of the lithium battery energy storage sub-station or the redox flow battery energy storage sub-station, the active power command value of the lithium battery energy storage sub-station and the flow battery energy storage sub-station;
C, determining, using the redox flow battery energy storage sub-station, the active power command value of the lithium battery energy storage units and the flow battery energy storage units separately;
D, summarizing, using the redox flow battery energy storage sub-station, the active power command value of each lithium battery energy storage unit and flow battery energy storage unit,; and
E, controlling, using the active power command value, an optimized, real-time power distribution between the lithium battery energy storage and the redox flow battery hybrid energy storage power station;
the said step B includes the following steps:
B 1 ) filtering the energy storage station total active power real-time demand value, wherein a low-frequency part of power after filtering is the lithium battery energy storage sub-station's active power command value;
B 2 ) through filtering of step B 1 , in addition to the low-frequency part of the power the rest of the power is the flow battery energy storage sub-station active power command value;
B 3 ) judging whether the lithium battery energy storage sub-station active command value meets a maximum allowable discharging power and maximum allowable charging power constraint condition of the corresponding sub-station, and judging whether the redox flow battery energy storage sub-station active command value meets a maximum allowable discharging power and maximum allowable charging power constraint condition of the corresponding sub-station;
B 4 ) if any active power command value of the lithium battery energy storage sub-station or the flow battery energy storage sub-station violates the constraint condition, then executing step B 5 , or ending the judgment; and
B 5 ) according to the energy storage power station total active real-time demand value, the maximum allowable discharging power of the lithium battery energy storage sub-station and the flow battery energy storage sub-station, and the maximum allowable charging power of the lithium battery energy storage sub-station and the flow battery energy storage sub-station, recalculating the active power command value of the lithium battery energy storage sub-station or the flow battery energy storage sub-station which violates the constraint condition in step B 4 ;
wherein the maximum allowable discharging power of the lithium battery energy storage sub-station is the sum of each maximum allowable discharging power of the lithium battery energy storage unit, said the maximum allowable discharging power of the redox flow battery energy storage sub-station is the sum of each the maximum allowable discharging power of the redox flow battery energy storage unit, said the maximum allowable charging power of the lithium battery energy storage sub-station is the sum of each the maximum allowable charging power of the lithium battery energy storage unit, said the maximum allowable charging power of the redox flow battery energy storage sub-station is the sum of each the maximum allowable charging power of the redox flow battery energy storage unit.

2. The real-time power distribution method according to claim 1 , is characterized that, in step A, said battery station running real-time data includes: controllable state, state of charge value, maximum allowable discharging power and maximum allowable charging power of each lithium battery energy storage unit and flow battery energy storage unit.

3. The real-time power distribution method according to claim 1 , is characterized that, said constraint condition in step B 3 refers to:
when the lithium battery energy storage sub-station active command value is greater than zero, the lithium battery energy storage sub-station active command value is equal or less than the maximum allowable discharging power of the lithium battery energy storage sub-station;
when the lithium battery energy storage sub-station active command value is less than zero, the lithium battery energy storage sub-station active command value is equal or less than the absolute value of the maximum allowable charging power of the lithium battery energy storage sub-station;
when the flow battery energy storage sub-station active command value is greater than zero, the flow battery energy storage sub-station active command value is equal or less than the maximum allowable discharging power of the flow battery energy storage sub-station;
when the flow battery energy storage sub-station active command value is less than zero, the flow battery energy storage sub-station active command value is equal or less than the absolute value of the maximum allowable charging power of the flow battery energy storage sub-station.

4. The real-time power distribution method according to claim 1 , is characterized that, said step B 5 , the method of recalculating the active power command value of lithium battery energy storage sub-station or the flow battery energy storage sub-station which violates constraint condition in step B 4 includes:
when the energy storage power station total active real-time demand value is positive, taking a ratio of the sum of the values of the maximum allowable discharging power of the lithium battery energy storage sub-station or the flow battery energy storage sub-station to the maximum allowable discharging power of the lithium battery energy storage sub-station and the flow battery energy storage sub-station, and then multiplying it by total active power real-time demand value of battery energy storage station, and obtaining the active power demand value of the lithium battery energy storage sub-station and the flow battery energy storage sub-station separately;
when the energy storage power station total active real-time demand value is negative, taking a ratio of the sum of the values of the maximum allowable charging power of the lithium battery energy storage sub-station or the flow battery energy storage sub-station to the maximum allowable charging power of the lithium battery energy storage sub-station and the flow battery energy storage sub-station, and then multiplying it by total active power real-time demand value of battery energy storage station, and obtaining the active power demand value of the lithium battery energy storage sub-station and the flow battery energy storage sub-station separately.

5. The real-time power distribution method according to claim 1 , is characterized that, in step C, first separately redistributing the active power command value of the lithium battery energy storage sub-station and the flow battery energy storage sub-station which is calculated in step B, wherein the active power command value of each lithium battery energy

Assignees

• Zhangjiakou Wind And Solar Power Energy Demonstration Station Co Ltd State Grid Xin Yuan Company
• China Electric Power Res Inst
• State Grid Corp China
• Zhangjiakou Wind And Solar Power Energy Demonstration Station Co Ltd State Grid Xin Yuan Company

Inventors

• Li Xiangjun
• Hui Dong
• Jia Xuecui
• Lai Xiaokang
• Wang Yinming
• Zhu Si

Classifications

• H02J7/90

  Regulation of charging or discharging current or voltage · CPC title

• H02J7/50

  acting upon multiple batteries simultaneously or sequentially · CPC title

• H01M16/00 Primary

  Structural combinations of different types of electrochemical generators · CPC title

• H02J7/34

  Parallel operation in networks using both storage and other DC sources, e.g. providing buffering (H02J7/14 takes precedence) · CPC title

• G01R31/3606 Primary

  Physics · mapped topic