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Resonance is a common problem of power quality in the renewable energy power generation system, and its suppression strategy is closely related to the safe and stable operation of the grid connected with the renewable energy. In this paper, the generation mechanism and related influencing factors of resonance are analysed at first by analysing the specific resonance problem of photovoltaic power station...
Photovoltaic energy (PV) is one of the cleanest forms of renewable energy. The popularity of this technology has been widely recognized with the incentives provided by the governments of various countries across the globe. Day by day, the growth rate of PV is steadily increasing. Renewable energy resources like PV are interfaced with power electronic inverters to enable its interconnection to the...
In this paper, a new three input ports generation system with open-winding generator for wind/solar hybrid generation system is proposed. By using an open-winding topology can save a set of full-controlled power electronic device, which simplifies the structure and increases the system reliability. In order to maintain the generating efficiency of PM generator, d axis current is set to zero, battery...
The 21st COP, hosted in Paris, France, in December 2015, selected Paris Agreement that mandated all countries to participate in the global response to climate change. With this, the rail transportation system in Korea is undergoing active research on low-carbon emitting technologies. The current paper designs photovoltaic power generation system using the rooftop of Gwangmyeong Station, the largest...
Renewable energy resources such as Solar, wind and hydro are pollution free, easily erectable, and limitless so they represent reliable alternatives to conventional energy sources e.g. oil and natural gas. However, the efficiency and the performance of these systems are still under development. Among them, Photovoltaic systems are mostly used as they are light, clean and easily installable. This systems...
This paper presents a system identification based minimum variance architecture for active and reactive power control of a Grid Connected Inverter (GCI). The controller is adaptive as the parameters in the control law are updated online based on identification that relate the output (active and reactive power) and the input (direct and quadrature axis voltage references). The main advantage of the...
This paper investigates cyber-attacks compromising the data integrity of inverter-based islanded microgrids featuring an energy storage system (ESS), a wind turbine generator (WTG), a photovoltaic system (PV) and controllable loads. The ESS operates as the isochronous generator, responsible for forming the microgrid voltage and frequency, whereas the WTG and PV distributed energy resources (DER) operate...
Global warming might be one of the driving forces to develop electrical drive trains due to the ability of being powered 100% renewable. However, cost reasons are still a driving issue. Referring to electrical based powertrains, they rely on two separate power nets. Here electrical power must be transferred from the electrical drive train net to the standard net. This typically is realized employing...
In this study, an optimized design of a PV-diesel hybrid renewable energy system has been proposed to electrify remote locations in the eastern part of Malaysia, which are located far away from the grid. First, a brief review of energy status in the eastern part of Malaysia has been conducted, and then an illustration of the various electrification plans for remote locations in Sarawak has also been...
The main function of the dc–dc converter in a grid-connected photovoltaic (PV) system is to regulate the terminal voltage of the PV arrays to ensure delivering the maximum power to the grid. The purpose of this paper is to design and practically implement a robust continuous-time model predictive control (CTMPC) for a dc–dc boost converter, feeding a three-phase inverter of a grid-connected PV system...
This paper presents a power scheme known as back-to-back used as a power conditioner for a wind turbine system which uses a permanent magnet synchronous generator (PMSG). The back-to-back power structure consists of a three-phase pulse width modulated (PWM) active rectifier, a dc-link bus voltage and a three-phase PWM inverter. Both power conditioning structures can be operated under traditional and...
This work presents the design and the realization of an autonomous small scale brackish water reverse osmosis desalination unit powered by intermittent renewable energy source. Sizing of motor-pumps, desalination membrane, renewable energy source and measuring instruments is detailed and analyzed. Motor-pumps characterization allowed to study their performances for several operating points according...
Multilevel inverters supplied by independent sources are increasingly studied to connect these sources to grid. One of the challenges is voltage balancing. Indeed, when supplying powers coming from renewable sources are different, the inverter input voltages are unbalanced. In this paper, a stable DC bus voltage balancing technique without modifying MPPT algorithm is presented. This allows an MPPT...
The recent makeshift in fuel choice, renewable energy sources has been considered as the most popular form of its kind because of its environment friendly approaches, less cost tariff policy and the natural fuel abundance. This inclusion in power system promotes Micro-grid system to optimize the overall distribution. FPGA, elaborated as Field Programmable Gate Array, proposes chances for enhanced...
In this paper short-circuit models for inverter based distributed generators (IBDGs) are proposed, based on the fault ride through (FRT) requirements of existing distribution codes. Currently, the IBDGs do not have generally accepted short-circuit models as the traditional synchronous and induction generators do. However, as their usage in the power industry is constantly increasing, there is an urgent...
The world is moving towards utilization of renewable energy generation systems from last few years. The implementation of micro-grids enables utilization of renewable sources and also helps in maintaining cleanliness of environment. Microgrid is nothing but grid consisting of energy generation sources and local load which can be operated in parallel with utility grids or can be operated in islanded...
The Lebanese electricity system system's deteriorating situation (mainly characterized by the daily long rationing hours), has led to the wide use of diesel generators by Lebanese citizens to compensate for the outage hours. Unfortunately, this has led to lower energy efficiency, higher cost of power production, and notably higher greenhouse gas emissions. In this paper, a renewable-based micro-grid...
Demand of electricity is growing very rapidly for industrialization & urbanization of India. Renewable energy sources being available abundantly in nature can be considered as a better option over conventional energy sources. Solar and wind energy are available in large amount and can be considered as reliable source of power generation. Hybrid solar and wind energy systems can be used for rural...
In this paper the main features of a transformerless 10 kW three-phase inverter, compliant to IEC-61850 communication standard, will be presented. It will be used for a research project concerning the study of grid harmonics pollution produced by high penetration of DER (Distributed Energy Resources). It will allow testing different harmonics mitigation and power injection control strategies.
Smart Grids are a hot topic with hundreds of applications and different approaches. In the present paper, the proposed system integrates street lighting, renewable energy sources, energy storage devices and inverter connected to the mains. With this in mind, the Smart Grid can be considered not only as an energy consumer/generator but also as a grid supporter, being capable of reducing the energy...
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