Distributed control strategy of hybrid energy storage system in the DC microgrid

Autor: Fan Wang, Changpeng Teng, Fengyi Zhang, Yubin Wang
Rok vydání: 2018
Předmět:
power generation control
batteries
Computer science
020209 energy
ultracapacitor group
Energy Engineering and Power Technology
02 engineering and technology
low-frequency power fluctuations
Energy storage
Automotive engineering
secondary cells
DC bus voltage control
distributed power generation
distributed control
HESS
dynamic stability
power system dynamic stability
0202 electrical engineering
electronic engineering
information engineering
DC microgrid
Supercapacitor
SoC control
supercapacitors
energy storage
business.industry
voltage control
020208 electrical & electronic engineering
Photovoltaic system
General Engineering
hybrid energy storage system
distributed control strategy
renewable energy
high-frequency power fluctuations
Power (physics)
Renewable energy
State of charge
lcsh:TA1-2040
Control system
Microgrid
lcsh:Engineering (General). Civil engineering (General)
business
electric current control
state-of-charge
Software
current control loop
Zdroj: The Journal of Engineering (2019)
ISSN: 2051-3305
Popis: In a DC microgrid, because the output of renewable energy such as photovoltaic is intermittent, hybrid energy storage system (HESS) combining ultracapacitors and batteries is usually used to solve this issue. According to the characteristics of ultracapacitors and batteries, the low-frequency power fluctuations are assigned to batteries, while the high-frequency power fluctuations are assigned to ultracapacitors. When considering an ultracapacitor group, state-of-charge (SoC) of the ultracapacitors will be unbalanced between each other, on account of the differences of initial states or attributes. A novel distributed control method is proposed in this study. In general, ultracapacitors control the DC bus voltage and batteries control SoC of the ultracapacitors. Additionally, the distributed control adds the difference between one ultracapacitor's SoC and the average SoC of the ultracapacitor group to its current control loop. As a result, the dynamic stability of SoC among the ultracapacitors can be achieved, and the issues of overcharging and/or over discharging of the ultracapacitors can be avoided. At last, the effectiveness of the proposed control strategy is validated by the simulation model built in MATLAB/Simulink.
Databáze: OpenAIRE
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