Efficiency Comparison of DC and AC Coupling Solutions for Large-Scale PV+BESS Power Plants

Franco, Francesco Lo; Morandi, Antonio; Raboni, Pietro; Grandi, Gabriele

doi:10.3390/en14164823

Cited by 13 publications

(7 citation statements)

References 30 publications

(42 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the load of the system is disturbed so that the frequency change exceeds the regulation dead band, the photovoltaic power station should be able to respond to the change and make corresponding adjustments to restore the system frequency [11]. When the frequency meter changes due to load disturbance, the output of the photovoltaic power station shall be adjusted as follows:…”

Section: Photovoltaic Primary Frequency Modulation Action Modementioning

confidence: 99%

The principle and control strategy of primary frequency modulation of energy storage auxiliary photovoltaic station

Song

Dang

Zhao

et al. 2023

Third International Conference on Mechanical, Electronics, and Electrical and Automation Control (METMS 2023)

View full text Add to dashboard Cite

Under the "double carbon" goal, the proportion of new energy in China's power system is increasing year by year, and the power grid is facing huge challenges under the "double high" power system. Photovoltaic power generation has a strong volatility. After grid connection, it has no ability to provide support for the frequency stability of the system. On the contrary, it will bring uncontrollable interference to the grid. Especially when the power grid has serious frequency fluctuations, the ability and time of frequency control are more difficult to meet the system requirements. The above problems are huge challenges for PV grid connection. The energy storage has the characteristics of fast response, high climbing speed and accurate action. In order to improve the impact of photovoltaic grid connection on the system frequency, introducing energy storage to assist the primary frequency modulation of photovoltaic stations can enhance the friendliness of photovoltaic power generation. Finally, this paper studies the primary frequency modulation control strategy of photovoltaic station assisted by energy storage. Through simulation, the curves of energy storage in different situations and the amount of action are obtained.

show abstract

Section: Photovoltaic Primary Frequency Modulation Action Modementioning

confidence: 99%

The principle and control strategy of primary frequency modulation of energy storage auxiliary photovoltaic station

Song

Dang

Zhao

et al. 2023

Third International Conference on Mechanical, Electronics, and Electrical and Automation Control (METMS 2023)

View full text Add to dashboard Cite

show abstract

“…N recent years, DC distribution systems have grown in popularity due to their superiority over standard AC systems in terms of improving overall efficiency in buildings, particularly when renewable energy sources are integrated [1]. When the AC system is replaced with the DC system, studies have shown that a relative reduction in system loss of up to 2.3% [2] and an improvement in grid energy savings of 7% [3] may be obtained. The advantage of the DC system may vary based on geographical location, allowing renewable energy sources to contribute to matching the load demand of individual end-users throughout different seasons.…”

Section: Introductionmentioning

confidence: 99%

Bidirectional Synchronous H6 Inverter for Hybrid AC/DC Distribution System With Improved Light Load Efficiency

Alshammari

Duffy

2023

IEEE Access

View full text Add to dashboard Cite

The overall efficiency of DC distribution systems may be impacted by the operation of the bidirectional inverter connected to the grid; one of its most critical components. When compared to highdemand industries, the typical load profile of such system in residential buildings is highly variable, including several periods of light-load. Therefore, this paper presents a method to overcome the reduced efficiency at light-load of bidirectional inverters integrated into a DC distribution system powered by renewable energy. Existing topologies are evaluated for obtaining optimal efficiency as well as an investigation of loss breakdown at light-load using analytic models and PSIM simulation. A novel synchronous H6 transformerless topology is proposed. Simulation results show that the proposed topology can achieve an efficiency of 96.5% under full load and 98.3% under light-load. Efficiency improvements over a standard H6 topology are 4.5% under light-load and 1.5 % at full load. This is mostly due to reduced conduction and switching ON loss of MOSFETs used to replace diodes. When using the rectifier mode, similar levels of improvement are observed, with a 4% increase under light-load and a 1.2% improvement under full load conditions, respectively. Experimental results confirm the effectiveness of the proposed topology, showing nearly the same trend in improvement vs. the standard H6.

show abstract

“…A similar concern is caused by the intermittent nature of RES, whose power generation strongly depends on the availability of the primary source (wind, solar, etc. ) and cannot usually provide the control and regulation services that conventional sources can do (Luo and Ooi, 2006;Kroposki et al, 2017;Lo Franco et al, 2021a). Intermittent power injection together with localized load power peaks (aggregate EV charging) might even bring to the nonoptimal utilization of conventional plannable power sources for grid supporting operation (ancillary services).…”

Section: Introductionmentioning

confidence: 99%

Electric Vehicles Charging Management System for Optimal Exploitation of Photovoltaic Energy Sources Considering Vehicle-to-Vehicle Mode

et al. 2021

Self Cite

View full text Add to dashboard Cite

The growing penetration of distributed renewable energy sources (RES) together with the increasing number of new electric vehicle (EV) model registrations is playing a significant role in zero-carbon energy communities’ development. However, the ever-larger share of intermittent renewable power plants, combined with the high and uncontrolled aggregate EV charging demand, requires an evolution toward new planning and management paradigms of energy districts. Thus, in this context, this paper proposes novel smart charging (SC) techniques that aim to integrate as much as possible RES generation and EV charging demand at the local level, synergically acting on power flows and avoiding detrimental effects on the electrical power system. To make this possible, a centralized charging management system (CMS) capable of individually modulating each charging power of plugged EVs is presented in this paper. The CMS aims to maximize the charging self-consumption from local RES, flattening the peak power required to the external grid. Moreover, the CMS guarantees an overall good state of charge (SOC) at departure time for all the vehicles without requiring additional energy from the grid even under low RES power availability conditions. Two methods that differ as a function of the EV power flow direction are proposed. The first SC only involves unidirectional power flow, while the second one also considers bidirectional power flow among vehicles, operating in vehicle-to-vehicle (V2V) mode. Finally, simulations, which are presented considering an actual case study, validate the SC effects on a reference scenario consisting of an industrial area having a photovoltaic (PV) plant, non-modulable electrical loads, and EV charging stations (CS). Results are collected and performance improvements by operating the different SC methods are compared and described in detail in this paper.

show abstract

Efficiency Comparison of DC and AC Coupling Solutions for Large-Scale PV+BESS Power Plants

Cited by 13 publications

References 30 publications

The principle and control strategy of primary frequency modulation of energy storage auxiliary photovoltaic station

The principle and control strategy of primary frequency modulation of energy storage auxiliary photovoltaic station

Bidirectional Synchronous H6 Inverter for Hybrid AC/DC Distribution System With Improved Light Load Efficiency

Electric Vehicles Charging Management System for Optimal Exploitation of Photovoltaic Energy Sources Considering Vehicle-to-Vehicle Mode

Contact Info

Product

Resources

About