scholarly journals A Novel Control Method of Low-voltage-ride-through Technique for Asymmetrical Hybrid Energy Storage System

2021 ◽  
Vol 2108 (1) ◽  
pp. 012042
Author(s):  
Xiaomeng LI ◽  
Ze Gao ◽  
Zhen’an Zhang ◽  
Yufei Rao
Keyword(s):  
Energy Storage ◽  
Power Distribution ◽  
Control Method ◽  
Low Voltage ◽  
Storage System ◽  
Energy Storage System ◽  
Positive Sequence ◽  
Low Voltage Ride Through ◽  
Zero Sequence ◽  
Battery Cells

Abstract Low-voltage-ride-through (LVRT) capability is an important criterion for the stability of cascaded multilevel energy storage system (ESS). Based on asymmetrical hybrid ESS, a coordinated operating method is proposed to maintain the phase angle of positive-sequence-voltage of battery cells and capacitor cells. To deal with the asymmetrical chains among three phases, its influence on the power distribution is eliminated by modifying the command of battery cells, then the traditional zero-sequence-voltage injection is feasible for asymmetrical situations. Proposed methods can stabilize the dc-side voltage of capacitor cells, maintaining the output current. Finally, the correctness and effectiveness of proposed methods are proved by experiment.

scholarly journals Linear Active Disturbance Rejection Control for DC Bus Voltage Under Low-Voltage Ride-Through at the Grid-Side of Energy Storage System

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1207
Author(s):  
Youjie Ma ◽  
Luyong Yang ◽  
Xuesong Zhou ◽  
Xia Yang ◽  
Yongliang Zhou ◽  
...  
Keyword(s):  
Energy Storage ◽  
Disturbance Rejection ◽  
Low Voltage ◽  
Storage System ◽  
Energy Storage System ◽  
Active Disturbance Rejection Control ◽  
Low Voltage Ride Through ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
Grid Side

The energy storage inverter system has the characteristics of nonlinearity, strong coupling, variable parameters, and flexible mode switching between parallel and off grid. In order to improve the control performance of the grid-side inverter of the energy storage system, an improved Linear Active Disturbance Rejection Control (LADRC) based on proportional differentiation is proposed to replace the traditional LADRC in the voltage outer loop control. In this paper, the observation gain coefficient of the sum of the disturbances of the traditional Linear Extended State Observer (LESO) is improved to a proportional differentiation link, which effectively reduces the degree of the disturbance observation amplitude drop and the phase lag, and increases the observation bandwidth of LESO. Compared with traditional LADRC, it not only improves the observation accuracy of LESO for disturbance, but also improves the anti-interference performance of LADRC. Finally, the control effects of improved LADRC and traditional LADRC on low-voltage ride-through at different degrees are analyzed and compared through simulation, which proves the rationality of the controller designed in this paper.

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