scholarly journals An Optimal Control Strategy for DC Bus Voltage Regulation in Photovoltaic System with Battery Energy Storage

2014 ◽  
Vol 2014 ◽  
pp. 1-16 ◽  
Author(s):  
Muhamad Zalani Daud ◽  
Azah Mohamed ◽  
M. A. Hannan
Keyword(s):  
Energy Storage ◽  
Optimization Technique ◽  
Current Mode ◽  
Voltage Regulation ◽  
Boost Converter ◽  
Pv System ◽  
Battery Energy Storage ◽  
Dc Bus ◽  
Bus Voltage ◽  
Battery Energy

This paper presents an evaluation of an optimal DC bus voltage regulation strategy for grid-connected photovoltaic (PV) system with battery energy storage (BES). The BES is connected to the PV system DC bus using a DC/DC buck-boost converter. The converter facilitates the BES power charge/discharge to compensate for the DC bus voltage deviation during severe disturbance conditions. In this way, the regulation of DC bus voltage of the PV/BES system can be enhanced as compared to the conventional regulation that is solely based on the voltage-sourced converter (VSC). For the grid side VSC (G-VSC), two control methods, namely, the voltage-mode and current-mode controls, are applied. For control parameter optimization, the simplex optimization technique is applied for the G-VSC voltage- and current-mode controls, including the BES DC/DC buck-boost converter controllers. A new set of optimized parameters are obtained for each of the power converters for comparison purposes. The PSCAD/EMTDC-based simulation case studies are presented to evaluate the performance of the proposed optimized control scheme in comparison to the conventional methods.

scholarly journals Improved Dynamic Voltage Regulation in a Droop Controlled DC Nanogrid Employing Independently Controlled Battery and Supercapacitor Units

2018 ◽  
Vol 8 (9) ◽  
pp. 1525
Author(s):  
Ahmad M. A. Malkawi ◽  
Luiz A. C. Lopes
Keyword(s):  
Energy Storage ◽  
Storage System ◽  
Voltage Regulation ◽  
Potential Contribution ◽  
Pass Filter ◽  
Power Sources ◽  
Dynamic Voltage ◽  
Dc Bus ◽  
Bus Voltage ◽  
The Impact

DC bus voltage signaling (DBS) and droop control are frequently employed in DC nano and microgrids with distributed energy resources (DERs) operating in a decentralized way. This approach is effective in enforcing the desired contributions of power sources and energy storage systems (ESSs) in steady-state conditions. The use of supercapacitors (SCs) along with batteries in a hybrid energy storage system (HESS) can mitigate the impact of high and fast current variations on the losses and lifetime of the battery units. However, by controlling the HESS as a single unit, one forfeits the potential contribution of the SC and its high power capabilities to dynamically improve voltage regulation in a DC nanogrid. This paper discusses an approach where the SC interface is controlled independently from the battery interface, with a small droop factor and a high pass filter (HPF), to produce high and short current pulses and smooth DC bus voltage variations due to sudden power imbalances in the DC nanogrid. Experimental results are presented to show that, unlike in a conventional HESS, the SC unit can be used to improve the dynamic voltage regulation of the DC nanogrid and, indirectly, mitigate the high and fast current variations in the battery.

scholarly journals PV system auto-sizing with battery energy storage based on GPS coordinates

2017 ◽  
Vol 12 (2) ◽  
pp. 29-41 ◽  
Author(s):  
Balint David Olaszi ◽  
Jozsef Ladanyi
Keyword(s):  
Energy Storage ◽  
Pv System ◽  
Battery Energy Storage ◽  
Battery Energy

scholarly journals Control Scheme and Power Electronics Architecture for a Wirelessly Distributed and Enabled Battery Energy Storage System

Energies ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1887 ◽  
Author(s):  
Jaber Abu Qahouq ◽  
Yuan Cao
Keyword(s):  
Energy Storage ◽  
Power Electronics ◽  
Storage System ◽  
Energy Storage System ◽  
Proof Of Concept ◽  
Battery Energy Storage System ◽  
Battery Energy Storage ◽  
Control Scheme ◽  
Bus Voltage ◽  
Battery Energy

This paper presents and evaluates a control scheme and a power electronics architecture for a Wirelessly Enabled and Distributed Battery Energy Storage (WEDES) system. It includes several independent battery modules (WEDES-MX modules) that transfer both power and information wirelessly to an On-Board Unit (OBU). Using wirelessly communicated State-Of-Charge (SOC) information from the WEDES-MX modules, the OBU part of the WEDES controller generates control commands and send them back to the WEDES-MX modules in order to control the amount of power/energy drawn from each WEDES-MX module and achieve SOC balancing. The presented controller also allows the WEDES system to maintain operation with a regulated bus voltage even if one or more WEDES-MX modules are removed or fail and under both balanced and unbalanced SOC conditions. The WEDES system with the presented WEDES controller when utilized in Electric Vehicle (EV) application, can allow for fast and safe exchange/swapping of WEDES-MX modules at an exchange station, home, or work and therefore potentially eliminating the range (mileage) anxiety issue that is associated with EVs’ range and the needed recharging time. The main objective of this paper is to present and evaluate the WEDES discharging controller for the WEDES system and present preliminary proof-of-concept scaled-down experimental prototype results.

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