Monitoring system and method for megawatt level battery energy storage power plant

Patent metadata

Field	Value
Publication number	US-9660450-B2
Application number	US-201314123518-A
Country	US
Kind code	B2
Filing date	Oct 17, 2013
Priority date	Oct 17, 2013
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

The present invention relates to a monitoring and controlling system and method for megawatt level battery energy storage power plant, which includes: a central monitoring and controlling module is used to determine the power command value of each energy storage substation of the battery energy storage power plant, and send it to all the local monitoring and controlling modules; the local monitoring and controlling modules is used to calculate the power command value of each energy storage unit of the energy storage substations controlled by it, and sending it to each energy storage unit, and upload to the central monitoring and controlling module to store. Between the central monitoring and controlling module and the local monitoring and controlling modules, the data transmission and communication are carried out through communication networks; the communication networks adopt real time and non real time communication parallel network structure.

First claim

What is claimed is:

1. A monitoring and controlling method for megawatt level battery energy storage power plant is characterized that, comprising:
step A. The central monitoring and controlling module reads the data of the battery energy storage power plant through the communication network, and stores and manages above data, said the communication network adopts real time and non real time communication parallel network structure;
step B. Determining the total power demand of the battery energy storage power plant according to the central monitoring and controlling module;
step C. Determining all the power demand values of the energy storage substation of the battery energy storage power plant according to the central monitoring and controlling module, and sending it to all the local monitoring and controlling modules;
step D. Calculating all the power command values of the energy storage units of the energy storage substation according to the local monitoring and controlling module, and sending it to the energy storage units;
step E. Sending all the power command values, real time data and non real time data of the energy storage units that are saved temporarily in the local monitoring and controlling module to the central monitoring and controlling module to storage and mange through the communication network;
the total power demand of the battery energy storage power plant can be determined by anyone as below in step B:
B1) reading wind/photovoltaic generation smooth aim value and the total power real time, and the different value to get which the latter value is subtracted from the former value is the total power demand of the battery energy storage plant the smooth wind/photovoltaic generation output fluctuation needed;
B2) reading wind/photovoltaic generation plan value real time, and determining the total power of the wind/photovoltaic energy storage generation, the power value of the wind and photovoltaic generation is subtracted from the total power value, and judge by the minus value and then adjust, get the total power demand of the battery energy storage station of tracking plan needed at present;
B3) reading system frequency regulation power command value P ES AGC , judging whether it satisfies the maximum allowable discharge power constraints or the maximum allowable charging power constraints according to the sign of P ES AGC ; if the violation of the constraint conditions, taking the battery energy storage station maximum allowed discharge power or the maximum allowable charging power as system frequency regulation required total power of the battery energy storage; otherwise, P ES AGC will be considered as system frequency regulation required total power of the battery energy storage;
B4) reading real the peak shaving curve value and system load curve value at present, and judging and re-correcting the minus value get from which the latter is subtracted from the former, and get the total power demand of the battery energy storage station of shaving peak needed at present;
B5) taking the battery energy storage station maximum allowed discharge power as the safe and stable control need total power of the battery energy storage; and
B6) reading real time the total power of the battery energy storage station need that is sent by external dispatch center directly.

2. The monitoring and controlling method according to claim 1 , is characterized that,
in step B1, the total power demand of the battery energy storage to output smooth wind/photovoltaic fluctuation is computed by the following formulations:
P ES TM =P SWP TV −P TWP

Where,

P
SWP
TV

=

1

1
+

sT
F

⁢

P
TWP

P
TWP

=

P
TW

+

P
TP

T
F

=

{

T
1

if
⁢

⁢

r
F

≤

δ
1

T
2

if
⁢

⁢

δ
1

<

r
F

≤

δ
2

T
3

if
⁢

⁢

r
F

>

δ
2

⁢

⁢

r
F

=

Assignees

• Zhangjiakou Wind And Solar Power Energy Demonstration
• China Electric Power Res Inst
• State Grid Corp China

Inventors

• Li Xiangjun
• Hui Dong
• Lai Xiaokang
• Jia Xuecui
• Wang Liye
• Guo Guangchao
• Wang Ping
• Liang Yanting
• Zhang Liang

Classifications

• H02J3/32 Primary

  using batteries or super capacitors with converting means · CPC title

• H02S10/20

  Systems characterised by their energy storage means (H02S40/38 takes precedence) · CPC title

• G05B13/04

  involving the use of models or simulators · CPC title

• Y02E70/30

  Systems combining energy storage with energy generation of non-fossil origin · CPC title

• H02S50/00

  Monitoring or testing of PV systems, e.g. load balancing or fault identification · CPC title