scholarly journals Research on Energy Management Strategy of Connecting and Off-grid Charging Station with Photovoltaic and Storage System

2017 ◽  
Author(s):  
Xiao-Yu ZHANG ◽  
Shou-Xin GU
Keyword(s):  
Energy Management ◽  
Management Strategy ◽  
Storage System ◽  
Energy Management Strategy ◽  
Charging Station ◽  
And Storage

A coordinated control strategy for battery/supercapacitor hybrid energy storage system to eliminate unbalanced voltage in a standalone AC microgrid

2020 ◽  
Vol 1 (1) ◽  
pp. 3-23
Author(s):  
Yaxing Ren ◽  
Saqib Jamshed Rind ◽  
Lin Jiang
Keyword(s):  
Energy Management ◽  
Management Strategy ◽  
Reactive Power ◽  
Storage System ◽  
Energy Storage System ◽  
Energy Management Strategy ◽  
Content Type ◽  
Hybrid Energy ◽  
Hybrid Energy Storage ◽  
Bus Voltage

PurposeA standalone microgrid (MG) is able to use local renewable resources and reduce the loss in long distance transmission. But the single-phase device in a standalone MG can cause the voltage unbalance condition and additional power loss that reduces the cycle life of battery. This paper proposes an energy management strategy for the battery/supercapacitor (SC) hybrid energy storage system (HESS) to improve the transient performance of bus voltage under unbalanced load condition in a standalone AC microgrid (MG).Design/methodology/approachThe SC has high power density and much more cycling times than battery and thus to be controlled to absorb the transient and unbalanced active power as well as the reactive power under unbalanced condition. Under the proposed energy management design, the battery only needs to generate balanced power to balance the steady state power demand. The energy management strategy for battery/SC HESS in a standalone AC MG is validated in simulation study using PSCAD/EMTDC.FindingsThe results show that the energy management strategy of HESS maintains the bus voltage and eliminates the unbalance condition under single-phase load. In addition, with the SC to absorb the reactive power and unbalanced active power, the unnecessary power loss in battery is reduced with shown less accumulate depth of discharge and higher average efficiency.Originality/valueWith this technology, the service life of the HESS can be extended and the total cost can be reduced.

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