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Stand-alone power system

About: Stand-alone power system is a research topic. Over the lifetime, 8650 publications have been published within this topic receiving 192397 citations. The topic is also known as: Stand-alone photovoltaic power system.


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Journal ArticleDOI
TL;DR: An operational scheme for photovoltaic (PV) inverter reactive power control to accommodate higher levels and leverage efficient use of rooftop PV penetration in distribution systems and proposes a coordination strategy in order to switch control between the states.
Abstract: This paper presents an operational scheme for photovoltaic (PV) inverter reactive power control to accommodate higher levels and leverage efficient use of rooftop PV penetration in distribution systems. The scheme proposes three states of operation with specific operational goals for the PV inverter based on weather conditions and voltage at the interconnection point, and adapts the reactive power control strategy accordingly. In normal state with slowly changing solar irradiance, the control modulates reactive power to reduce power losses. In fluctuating state with rapidly varying solar irradiance due to intermittent passing clouds, the control dynamically changes the reactive power in order to mitigate voltage fluctuations. In contingency state in which the PV terminal voltage violates the nominal operating range, the control adjusts the PV inverter as reactive power sink or source in order to push the voltage back within the range. This paper also proposes a coordination strategy in order to switch control between the states and manage interaction between the fast PV inverter controllers, and the slow on-load tap-changer for voltage regulation. A large-scale distribution network based on the IEEE 37-node test feeder was developed in order to investigate performance of the proposed algorithm.

67 citations

Journal ArticleDOI
TL;DR: In this article, the Co-Variation coefficient is used to assess the competitiveness of renewable energy sources, as opposed to dispatchable energy sources such as fossil fuels, in the western United States.

67 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed an operational model of an energy hub (EH) in a residential area to optimize the total energy cost in an operational scenario with solar photovoltaic (PV) generation, solar heat exchanger (SHE), and battery energy storage system.
Abstract: This paper aims to optimize total energy costs in an operational model of a novel energy hub (EH) in a residential area. The optimization problem is set up based on daily load demand (such as electricity, heat, and cooling) and time-of-use (TOU) energy prices. The extended EH model considers the involvement of solar photovoltaic (PV) generation, solar heat exchanger (SHE), and a battery energy storage system (BESS). A mathematical model is constructed with the objective of optimizing total energy cost during the day, including some constraints such as input-output energy balance of the EH, electricity price, capacity limitation of the system, and charge/discharge power of BESS. Four operational cases based on different EH structures are compared to assess the effect of solar energy applications and BESS on the operational efficiency. The results show that the proposed model predicts significant changes to the characteristics of electricity and gas power bought from utilities, leading to reduced total energy cost compared to other cases. They also indicate that the model is appropriate for the characteristics of residential loads.

67 citations

Journal ArticleDOI
TL;DR: In this paper, a hybrid regenerative power system including photovoltaic (PV) and wind powers and combining the functions of the grid-tie system and uninterruptible power supply (UPS) for critical load applications is presented.
Abstract: A hybrid regenerative power system including photovoltaic (PV) and wind powers and combining the functions of the grid-tie system and uninterruptible power supply (UPS) for critical load applications is presented. The proposed system employs six-arm converter topology with three arms for the rectifier-inverter, one arm for battery charging/discharging and two arms for power conversion of the PV module and wind turbine generator. The operation modes include the grid-tie mode and the UPS mode depending on the grid status. A power balance control scheme is presented, which can reduce the grid power and utilise the regenerative power in the most effective way for fulfilling the two requirements of a three-stage charging of the battery and no interruption of the load. Also, the PV and wind powers can be utilised with priority in order to provide the flexibility for adapting to local circumstances. A single-phase 1.2-kW/110-V system is designed and implemented, and the effectiveness of the proposed system and control methodology are verified with some experimental results.

67 citations

Journal ArticleDOI
TL;DR: In this article, a power system consisting of a high penetration of wind generation and energy storage systems (ESS) is investigated for the regulation of grid frequency, and a new strategy called state of charge (SoC) feedback control is proposed, and the performance of the grid frequency deviation response and the SoC of the battery are presented.
Abstract: With increased penetration of wind generation, the traditional control scheme of the wind turbine (WT), which is designed for maximum wind power extraction, is no longer suitable to meet emerging grid requirements for wind farms to participate in frequency regulation. The control scheme of the WT with respect to grid frequency regulation is proposed in many studies, such as those on pitch control. Also, energy storage technologies have drawn much attention in recent years because, as technology matures and costs decrease, they present themselves as a potential solution for the challenge brought about by the uncertainty of renewable energy generation with regard to power system stability. A power system consisting of a high penetration of wind generation and energy storage systems (ESS) is investigated in this paper for the regulation of grid frequency. A new strategy called state of charge (SoC) feedback control is proposed, and the performance of the grid frequency deviation response and the SoC of the battery are presented. The model of the power system studied in this paper is established on the MATLAB/SIMULINK platform.

67 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202388
2022188
20213
20208
20196
201843