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Solar energy has the characteristics of intermittent and unstable, and it results in the negative impact on power quality of the utility grid while the penetration rate of the grid-connected photovoltaic generation system is increased. The energy storage system (ESS) can alleviate the negative impact on power quality of the utility grid so as to increase the penetration rate of the grid-connected...
This paper presents the control and charge management strategy of a photovoltaic system (PV) with plug-in hybrid electric vehicle (PHEV) as energy storage. The hybrid energy storage system (HESS) of PHEV consists of battery and supercapacitor. A simulation model for the PV system with PHEV energy storage has been developed using Matlab/SimpowerSystems. The system consists of PV arrays, SEPIC dc-dc...
In the case of low voltage (LV) distribution networks, the inclusion of smart homes is expected to increase the systems complexity due to multiplicity of interacting users with autonomous use of energy and the highly penetration of photovoltaic (PV). Consequently, the shift towards smart LV distribution systems implies that the traditional unidirectional power flow formulation and control strategies...
This paper presents a single-phase zero-voltage switching (ZVS) AC-link inverter for PV-grid connection at maximum power operation. The PV modules charge an AC-link until it reaches a certain reference current waveform; while, in the same time, the PV modules is connected to the grid inverter via a series inductor. Then the PV modules are disconnected and the charged AC-link discharges into the grid...
An increasing adoption of rooftop photovoltaic (PV) generators presents a growing opportunity for the use of their grid-tie inverters to provide reactive power compensation on medium- and low-voltage distribution networks. This paper presents a generalized method based on particle swarm optimization (PSO) for determining how much reactive power is necessary to provide control over the voltage profile...
The growing concern for energy saving has increased the usage of LED-based street lights, electronic chokes, compact fluorescent lamps, and inverter-fed drives. Hence, the load profile seen by the electrical grid is undergoing a notable change as these devices have to operate from a dc source. Photovoltaics (PV) being a major energy source, the aforementioned loads can be connected directly to the...
A low voltage (LV) distribution level unified power flow controller (UPFC) is shown capable of regulating the positive sequence voltage with a network while simultaneously correcting phase unbalance voltages that can be produced by high levels of distributed photovoltaic (PV) generation. Instantaneous reactive power theory shows that DC-bus capacitor power will fluctuate at twice mains frequency during...
The proportion of renewable energies in power generation has increased according to the political aims in recent years. In low-voltage grids, these are mostly decentralized renewable energy systems such as photovoltaic (PV) that are connected through the inverters to the grid. The temporary reversal of the power flow causes overvoltage problems. Consequently, regenerative sources need to be turned...
In this paper, the modular concept of DC/DC converters for the power conversion of solar panels is presented. As a result, individually doing maximal power point tracking for each solar panel plus soft-switching technique can maximally increase the global efficiency. Due to the modular concept, un-planed shutting down big distributed power generator in smart grids can be avoided. In addition, the...
This paper presents a scheme for supervisory control of decentralized stand-alone PV systems. The control is designed to maintain the DC bus regulated independently of solar irradiation, battery charge and load demands. In order to achieve this objective we propose an overall power management strategy to control power flows among PV arrays, battery bank, and inverter. Experimental results for a 480VA...
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