scholarly journals Analysis of a Microgrid under Transient Conditions Using Voltage and Frequency Controller

2012 ◽  
Vol 2012 ◽  
pp. 1-18 ◽  
Author(s):  
Monika Jain ◽  
Sushma Gupta ◽  
Deepika Masand ◽  
Gayatri Agnihotri
Keyword(s):  
Neutral Current ◽  
Storage System ◽  
Energy Storage System ◽  
Current Control ◽  
Transient Conditions ◽  
Harmonic Elimination ◽  
Hydropower Plants ◽  
Micro Grid ◽  
Load Leveling ◽  
Battery Energy

This paper presents an investigation of voltage-and-frequency-(VF-) based battery energy storage system (BESS) controller used in micro grid for analyzing the optimum capability of plant. Microgrid is formed by using three hydropower plants feeding three-phase four-wire load. The proposed controller is used for load balancing, harmonic elimination, load leveling, and neutral current compensation. The proposed BESS controller permits the selection of an optimum voltage level of battery and allows independent current control of each phase. The main emphasis is given on maintaining constant voltage and frequency within the micro grid during transient conditions. Micro grid with power plant and its controller is modeled in MATLAB/Simulink using Power System Blockset (PSB) toolboxes.

Control Method of Parallel Vanadium Batteries Operating in Energy Stored Wind Farm System

2012 ◽  
Vol 512-515 ◽  
pp. 1027-1031 ◽  
Author(s):  
Xu Dong Guo ◽  
Bao Ming Ge ◽  
Da Qiang Bi ◽  
Xin Yu Yang
Keyword(s):  
Wind Farm ◽  
Control Method ◽  
Power Grid ◽  
Storage System ◽  
Wind Farms ◽  
Energy System ◽  
Energy Storage System ◽  
Current Control ◽  
Farm Model ◽  
Battery Energy

Wind farms with vanadium battery energy storage system are recognized and welcomed. Against the phenomenon of current distribution unreasonable while vanadium batteries are directly paralleled, a control strategy of vanadium battery parallel based on the state of charge (SOC) is proposed. The current control formula is given in this paper. Vanadium batteries are paralleled to adjust the power grid at the exit of wind farms by the bidirectional DC/DC converter. A wind farm model with vanadium battery energy system is simulated on MATLAB/Simulink. The simulation results show that this system can adjust the power grid of wind farms and achieve the goal that the charging and discharging of vanadium batteries are determined by their SOC, avoiding the overcharge or over-discharge.

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