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Power Quality (PQ) disturbances result in significant financial losses to both network operators and end users. With the increasing regulatory requirement to monitor and improve PQ, the mitigation of PQ disturbances becomes even more important. This paper focuses on assessment of the harmonic performance at transmission network level considering increasing presence of stochastic and intermittent power...
Modern electric distribution systems require reinforcements to face the many challenges on the road towards the fulfillment of the “smart grid” paradigm. One of the most important issues is to provide adequate power quality levels, whose consistency could be compromised by the installation of more and more power electronic devices directly on low voltage networks. This paper is devoted to analyze...
Harmonic distortion on voltages and currents increases with the increased penetration of Plug-in Electric Vehicle (PEV) loads in distribution systems. Wind Generators (WGs), which are source of harmonic currents, have some common harmonic profiles with PEVs. Thus, WGs can be utilized to subside the effect of PEVs on harmonic distortion. This paper studies the impact of PEVs on harmonic distortions...
This paper develops an approach to islanding detection based on computing the frequency dependent impedance at the point of common coupling (PCC) that exploits the existing harmonics injected by the electric power system (EPS) and the harmonics injected by the distributed generator (DG). To this aim, a frequency dependent model is developed to characterize the change in the circuit interconnection...
In this paper, the placement of Custom Power Devices (CPDs) to improve the power quality of a distributed generation (DG) integrated building energy system (BES) has been analyzed. A typical residential building energy has been modeled in a Virtual Environment (VE) simulator. The extracted energy demand is generated by input load demand and hourly operating information. Based on the electrical energy...
In this paper, the electrical energy demand of a typical residential building has been extracted from a Virtual Environment (VE) simulation. The extracted energy demand is generated by input load demand and hourly operating information. Based on the electrical energy demand for a typical day, a building integrated photovoltaic (PV) system is then simulated in MATLAB to extract the current/voltage...
Norwegian distribution power systems are often composed of long distribution lines supplying households, communities and small industrial customers. When a significant amount of load contains power electronics devices, the harmonic pollution of these grids becomes semnificative. As the share of distributed generators in these power systems is increasing their impact on the power quality provided to...
The increasing global warming concerns and diminishing fossil fuels have made us necessary to look for alternative sources of energy. Fuel Cell technology holds promise towards sustainable power generation, it being pollution free and using readily available fuels. This paper presents the modeling, control and design analysis of a three-phase Grid-interactive Fuel Cell system with active filter functions...
It is acknowledged that Distributed Generation, in spite of the benefits that it provides, causes harmonics problems due to the power converter interfaces. In this paper, a generic approach is adopted to reduce the harmonic injection from converter-connected DG units, using a phase-shifting technique. By changing the vector group between transformers that connect with either converter-connected DG...
With increased emphasis on reducing carbon footprints, many countries are moving towards generating power from distributed generation (DG) that can harness energy from renewable resources such as wind and solar generation. This paper discusses the electrical power system analysis and modeling required as part of the design process for a new-build township that will integrate generation based on solar...
Recently, the number of distributed generation (DG) that connects to a distribution system has been increasing because of reduction of the environment load. However, the harmonic troubles in a distribution system are apprehended accompanying the increase of connection of DGs through the power conditioner system (PCS) (i.e. interconnected inverter of DG) and the spread of the power electronics equipments...
Due to the growth of Distributed Generation, also in Low Voltage Distribution Networks, in which single-phase generators may be connected to the grid, the voltage calculation it is necessary for each phase of the system. This is an important issue because an non-uniform connection of the single-phase generations on the three phases causes voltage imbalances along the feeders. Moreover, harmonic current...
The state of the art in distribution system analysis is examined with respect to distributed generation (DG). The types of analysis required for DG evaluation are described briefly. Then 14 challenges with respect to this subject are described and areas ripe for further research are pointed out.
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