Incorporating Battery Energy Storage Systems Into Multi-MW Grid Connected PV Systems

Rallabandi, Vandana; Akeyo, Oluwaseun M.; Jewell, Nicholas; Ionel, Dan M.

doi:10.1109/tia.2018.2864696

Cited by 92 publications

(28 citation statements)

References 23 publications

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“…Battery energy storage systems may be connected to either the ac or dc terminals of a grid-tied PV system. The ac connected battery units, which require their inverter, introduce the possibility of having an independent operation of the BESS and PV systems as well as the ease of integrating BESS into an existing PV system [15], [16]. However, the configuration is Figure 1.…”

Section: Battery Integrated Pv Systemsmentioning

confidence: 99%

The Design and Analysis of Large Solar PV Farm Configurations With DC-Connected Battery Systems

Akeyo

Rallabandi

Jewell³

et al. 2020

IEEE Trans. on Ind. Applicat.

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Typically, solar inverters curtail or "clip" the available power from the PV system when it exceeds the maximum ac capacity. This paper discusses a battery system connected to the dc-link of an inverter to recuperate this PV energy. Contrary to conventional approaches, which employ two dc-dc converters, one each for the battery and solar PV system, the proposed configuration utilizes a single dc-dc converter capable of simultaneously operating as a charge controller and a maximum power point tracking (MPPT) tracking device. In addition to improving the overall system capacity factor, increasing the conversion efficiencies and ensuring MPPT stability, the proposed configuration offers a simple solution for adding energy storage to existing PV installations. With this configuration, the excess power that will otherwise be curtailed due to inverter rating limitations is stored in the battery and supplied to the grid during periods of reduced irradiance. Moreover, a systematic methodology for sizing a dc-bus connected battery to minimize total PV energy curtailed was developed using an annual PV generation profile at the Louisville Gas and Electric and Kentucky Utilities (LG&E and KU) E.W. Brown solar facility at Kentucky. The detailed behavior of the proposed system and its power electronics controls and operations were validated with case studies developed in PSCAD T M /EMTDC T M for variable power generation and PV output power smoothing.

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Section: Battery Integrated Pv Systemsmentioning

confidence: 99%

The Design and Analysis of Large Solar PV Farm Configurations With DC-Connected Battery Systems

Akeyo

Rallabandi

Jewell³

et al. 2020

IEEE Trans. on Ind. Applicat.

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“…Fig. 3: The experimental data and validation in simulation, (a) arial view of the E. W. Brown 10MW PV farm in Kentucky, which provided the experimental data considered in the study [13], and (b) the PV power data in a winter day and the simulated power data.…”

Section: A Pv Array Modelingmentioning

confidence: 99%

On the Control of a Solid State Transformer for Multi-MW Utility-Scale PV-Battery Systems

Zhang

Akeyo

et al. 2019

2019 IEEE Energy Conversion Congress and Exposition (ECCE)

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The utility-scale photovoltaic (PV)-battery systems typically include multiple power converters connected to the grid via traditional line frequency transformers (LFT), which may be considered bulky, and inefficient when compared with the emerging solid state transformers (SST). This paper proposes a SST with power and voltage controls for utility-scale PVbattery systems. The PV system was modeled based on available data from a universal solar facility located in Kentucky, USA. Furthermore, this paper provides detailed controller designs for the proposed utility-scale PV-battery system based on a SST which includes: the PV-side dual-active bridge (DAB) converter tracks the maximum power point, the PV inverter for steady power transformation to the grid, battery-side DAB converter for maintaining stiff dc bus voltage, and the battery inverter for voltage support and balanceing the power mismatch between the grid demand and the PV generation. Moreover, medium frequency transformer (MFT) and Silicon Carbide (SiC) MOSFETs are utilized in the DAB converters and inverters, to improve the efficiency of the PV-battery system. The simulation results based on the data retrieved from an operational PV facility, on one hand, are presented to confirm the benefits of the proposed SiC SST based PV-battery system; on the other hand, provide an alternative analysis on power losses and efficiency for the utilityscale PV farms.

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“…In such hybrid PV-battery stations, power is transferred from PV array to battery and load during daytime and batteries transfer power to the load during night time. The battery storage system also improves the system dynamics for sudden weather changes [5,6]. Importance of hybrid PV-battery stations and operation strategy is discussed in [7].…”

Section: Introductionmentioning

confidence: 99%

A Hybrid PV-Battery System for ON-Grid and OFF-Grid Applications—Controller-In-Loop Simulation Validation

et al. 2020

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In remote locations such as villages, islands and hilly areas, there is a possibility of frequent power failures, voltage drops or power fluctuations due to grid-side faults. Grid-connected renewable energy systems or micro-grid systems are preferable for such remote locations to meet the local critical load requirements during grid-side failures. In renewable energy systems, solar photovoltaic (PV) power systems are accessible and hybrid PV-battery systems or energy storage systems (ESS) are more capable of providing uninterruptible power to the local critical loads during grid-side faults. This energy storage system also improves the system dynamics during power fluctuations. In present work, a PV-battery hybrid system with DC-side coupling is considered, and a power balancing control (PBC) is proposed to transfer the power to grid/load and the battery. In this system, a solar power conditioning system (PCS) acts as an interface across PV source, battery and the load/central grid. With the proposed PBC technique, the system can operate in following operational modes: (a) PCS can be able to work in grid-connected mode during regular operation; (b) PCS can be able to charge the batteries and (c) PCS can be able to operate in standalone mode during grid side faults and deliver power to the local loads. The proposed controls are explained, and the system response during transient and steady-state conditions is described. With the help of controller-in-loop simulation results, the proposed power balancing controls are validated, for both off-grid and on-grid conditions.

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Incorporating Battery Energy Storage Systems Into Multi-MW Grid Connected PV Systems

Cited by 92 publications

References 23 publications

The Design and Analysis of Large Solar PV Farm Configurations With DC-Connected Battery Systems

The Design and Analysis of Large Solar PV Farm Configurations With DC-Connected Battery Systems

On the Control of a Solid State Transformer for Multi-MW Utility-Scale PV-Battery Systems

A Hybrid PV-Battery System for ON-Grid and OFF-Grid Applications—Controller-In-Loop Simulation Validation

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