Showing papers by "Narsa Reddy Tummuru published in 2021"
TL;DR: Control structure along with power sharing scheme to operate the system under various operating modes, such as: 1) grid-connected mode; 2) islanded mode; 3) state of charge of battery less than or greater than specified limits; and 4) operating renewable sources (PV and wind) at maximum power point are presented.
Abstract: In this article, a new dc–dc multisource converter configuration-based grid-interactive microgrid consisting of photovoltaic (PV), wind, and hybrid energy storage (HES) is proposed. Control structure along with power sharing scheme to operate the system under various operating modes, such as: 1) grid-connected mode; 2) islanded mode; 3) state of charge of battery ( $SoC_{b}$ ) less than or greater than specified limits; and 4) operating renewable sources (PV and wind) at maximum power point, is presented. The detailed analysis, modeling, and design of the proposed configuration and control structure are presented. The key highlights of the proposed configuration are: 1) low component count; 2) voltage boosting, voltage regulation of supercapacitor and power-sharing among the battery and supercapacitor are inherent; and 3) simple control structure with a reduced number of sensors. Supercapacitor-battery-based HES is interfaced which effectively handle the power fluctuations due to the wind, PV, and sudden load disturbances. Integration of supercapacitor to respond to high-frequency fluctuations increases the lifetime of battery storage and reduces the sizing of the storage unit. The proposed system is verified through digital simulation and experimental results.
37 citations
TL;DR: A supercapacitor-battery based HES is interfaced which effectively handle the power fluctuations due to the wind, photovoltaic and sudden load disturbances and less number of switches is proposed.
Abstract: In this paper, a new multi-source and Hybrid Energy Storage (HES) integrated converter configuration for DC microgrid applications is proposed. Unlike most of the multi-input converter configurations, a supercapacitor-battery based HES is interfaced which effectively handle the power fluctuations due to the wind, photovoltaic and sudden load disturbances. Integration of supercapacitor to respond for high-frequency fluctuations increase the lifetime of battery storage and reduce the sizing of the storage unit. The control structure is framed to achieve power balance in the system along with basic functionality such as operating renewable sources (PV and wind) at maximum power point and charging and discharging of energy storage based on power availability. The key highlights of the proposed configuration are: (i) Less number of switches, (ii) Voltage boosting, voltage regulation of supercapacitor and power-sharing among battery and supercapacitor are inherent, (iii) Simple control structure with a reduced number of sensors. The detailed analysis, modeling, and design of the proposed configuration and control structure are presented along with MATLAB simulations and experimental validations.
33 citations
14 Jan 2021
TL;DR: A multisource converter configuration focusing on integrating supercapacitor, battery, wind, and photovoltaic, a grid-connected system, along with supervisory control, is developed.
Abstract: The integration of renewable power sources and energy storage using multiport converters is gaining immense attention. Appreciable research has been done and reported regarding the multiport converters. Among them, very few are related to the integration of supercapacitor-battery-based hybrid energy storage (HES). Therefore, focusing on integrating supercapacitor, battery, wind, and photovoltaic, a multisource converter configuration is proposed in this article. Based on the proposed configuration, a grid-connected system, along with supervisory control, is developed. The key contributions of the proposed configuration are as follows. The voltage regulation of supercapacitor is in-built, where extra voltage sensor and extra controller can be avoided. Transient/high-frequency components are diverted to supercapacitor inherently, where extra control circuitry and current sensor to achieve power-sharing among battery and supercapacitor can be avoided. Irrespective of load, the duty cycle of a photovoltaic hybrid converter is almost constant. Transformer is incorporated, which facilitates high voltage gain and galvanic isolation. The mathematical analysis, modeling, and design aspects are presented in detail. The proposed system is validated through digital simulations and experimental results.
17 citations
TL;DR: In this article, a three-layer modularized model of a microgrid is presented, with emphasis on the "Basic DC Microgrid Model" (Layer 1), which ensures effective power management in the microgrid at all times.
Abstract: A DC microgrid with DC bus signaling (DBS) for power management offers a promising and cost-effective solution for reliable electricity access in rural and remote communities, particularly in developing nations. In this article, a three-layer modularized model of a microgrid is presented, with emphasis on the “Basic DC Microgrid Model” (Layer 1), which ensures effective power management in the microgrid at all times. Through the framework of the Layer 1 model, various energy management scenarios (EMSes) can be implemented, by varying the voltage regulation priorities of the entities. This allows us to achieve different system objectives such as reduced battery requirement or less dependence on the AC Grid. Two of the EMSes are discussed, implemented, and examined through both digital simulations and experimental tests on a laboratory prototype. The results show that the DBS scheme achieves real-time power management in a DC microgrid and that different EMSes can be easily implemented to realize varied system-level objectives.
9 citations