scholarly journals A Power Conversion Technique with Hierarchical Equalization Charging Topology for LiFePO4 Batteries

Micromachines ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1014
Author(s):  
Kuo-Ching Tseng ◽  
Hao-Shiang Huang ◽  
Chun-An Cheng
Keyword(s):  
Energy Storage ◽  
Power Conversion ◽  
Experimental Results ◽  
Control Architecture ◽  
Battery Voltage ◽  
Battery System ◽  
Flyback Converter ◽  
Storage Scheme ◽  
Voltage Deviation ◽  
Number Of Cells

An energy-storage scheme with hierarchical equalization charging topology applied in a series-connected battery system is proposed in this paper. The proposed hierarchical equalization charging topology (HECT), which combines an equalizer-within module (EWM) and an equalizer between the modules (EBM), is able to rapidly achieve charging balance among a large number of cells in battery modules. The EWM is composed of a buck–boost converter, while a flyback converter constitutes the EBM. Besides, the voltage of each cell in battery modules can be accurately monitored by utilizing the proposed HECT control architecture. In addition, fewer circuit elements are required in the proposed battery equalization system and a faster balancing speed can be achieved. Satisfactory experimental results were obtained by using 12 LiFePO4 batteries, and the performance was improved by about 50% in reducing the battery voltage deviation realized in the proposed battery balancing system, which verified the function of the proposed HECT scheme.

scholarly journals Reliability Evaluation of PV Systems with Integrated Battery Energy Storage Systems: DC-Coupled and AC-Coupled Configurations

Electronics ◽  
2019 ◽  
Vol 8 (9) ◽  
pp. 1059 ◽  
Author(s):  
Monika Sandelic ◽  
Ariya Sangwongwanich ◽  
Frede Blaabjerg
Keyword(s):  
Energy Storage ◽  
Thermal Loading ◽  
High Efficiency ◽  
Power Conversion ◽  
Reliability Assessment ◽  
System Level ◽  
Pv System ◽  
Battery System ◽  
Battery Energy Storage ◽  
Battery Energy

Deployment of a battery energy storage system for the photovoltaic (PV) application has been increasing at a fast rate. Depending on the number of power conversion units and their type of connection, the PV-battery system can be classified into DC- and AC-coupled configurations. The number of the components and their electrical loading directly affects the reliability of each of the configurations. Hence, in order to assure high efficiency and lifetime of the PV-battery system, reliability assessment of power conversion units (representing the most reliability-critical system components) is necessary. With respect to that, in this paper, a reliability assessment of the PV-battery system is performed and a comparison of the DC- and AC-coupled configuration reliability is conducted. In the analysis, all parts of the power conversion system, i.e., DC/DC and DC/AC converter units, are taken into consideration and component-, converter- and system-level reliability is assessed. A case study of 6 kW PV system with integrated 3 kW/7.5 kWh battery system has shown that higher reliability is achieved for DC-coupled configuration. The obtained results indicate that the probability of failure for the 15% of the population for DC-coupled configuration occurs 7 years later than that is a case for AC-coupled configuration. Finally, the presented analysis can serve as a benchmark for lifetime and reliability assessment of power conversion units in PV-battery systems for both configuration types. It provides information about differences in electrical and thermal loading of the power conversion units and resulting reliability of the two configurations.

MATLAB MODELLING AND SIMULATION OF RECONFIGURABLE SOLAR CONVERTER: A SINGLE-STAGE POWER CONVERSION PV-BATTERY SYSTEM

2019 ◽  
Vol 12 (4) ◽  
pp. 30
Author(s):  
POTDAR AMARDEEP ◽  
GHUTKE PRATIK ◽  
POTDAR DISHA ◽  
TEKALE ANIL ◽  
◽  
...  
Keyword(s):  
Power Conversion ◽  
Modelling And Simulation ◽  
Single Stage ◽  
Battery System
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