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Recently, the distributed generation (DG) based on renewable energy sources (RESs) is quickly penetrating and integrating into the power systems. Moreover, a large number of intelligent infrastructures are installed into the power systems in order to establish a future power system, called smart grid. However, the increased grid integration of these sources leads to significant structural changes...
Distributed Energy Resources (DERs) are rapidly penetrating in power systems including their accompanying software and hardware (SW/HW) systems that are also distributed and related to different manufacturers and owners. Information integration and interoperability are two problems in distributed systems. This paper presents a comparison between the available integration middleware and standards for...
Grid interface units, namely inverters, can be used to function as primary controllers for distributed energy resources (DERs). To decrease the costs of the DERs integration in Smart Grids, two new functionalities added to the inverter are proposed in this paper. The first is the metering to count for the injected power into the grid and hence the inverter shares in business-related functions, which...
The increased grid integration of distributed generation technologies leads to significant structural changes for grid automation and control. There are still no sufficient strategies that are available for active grid integration of distributed generation units and their participation in grid control. New flexible concepts for control of the power system are required to ensure stable and secure operation...
In the future, distributed generation (DG) needs to be enabled to actively participate in control of grid voltage and frequency. An efficient grid integration strategy is required to interconnect the DG to conventional power systems and to improve the power quality and reliability (PQR) as well. The main task of the interconnected system is to control and maintain frequency and voltage of the power...
Distributed energy resources such as photovoltaic, fuel cells and micro turbines are emerging into power supply systems. Strategies of grid control integration, to emerge these sources are still lagging behind. These sources require interfacing units to provide the necessary crossing point to the grid. The cores of these interfacing units are power electronics technologies such as inverters (multifunctional...
The penetration of distributed generation is increasing to assist main power plants worldwide. An efficient strategy of grid control integration, to interconnect the DG systems to conventional power systems, is required to improve the power quality and reliability (PQR). The main task of the interconnected system is to control and maintain frequency and voltage of the power system in an acceptable...
Distributed generation (DG) technologies are emerging. Nevertheless, still no sufficient strategies for active grid integration of DG units and their participation in grid control are available. Including DG units into the control of the grid state variables and into secondary grid control, would enable a variety of additional features, specially supported by the decentralized character of the DG...
Distributed generation (DG) is recently integrating conventional power systems to assist main power plants to satisfy customer need. A control hierarchy to interconnect DG systems to conventional power systems is required to improve reliability and quality of power supply systems. The main task is to control the frequency and voltage of the systems. This task is currently done by using synchronous...
One of the desirable characteristics of inverters in three-phase systems is the ability to feed unbalanced/non-linear loads with voltage and frequency nominal values. Therefore three-leg four-wire inverters are expected to play an essential role in future power systems because of their ability to handle the neutral current caused by unbalanced or non-linear loads. This study introduces an original...
The analysis of distributed generation systems is a very important part of the overall development of future power systems. However, when researchers analyze full scale dynamic behavior of a synchronous generator connected to a distributed generation system, they face many complex tasks such as huge computational time. This paper presents a new modeling approach for distributed generation using Root-Mean-Square...
At present, power supply systems all over the world are facing challenging situations where they have to be extremely flexible, reliable and expandable. Due to the growing proportion of distributed and renewable energy sources, existing grids have to be revised. Power electronic inverters are the grid interfaces for energy converting systems and a key component to control and manage the energy systems...
An alternative energy supply to assist the main power stations in future power systems is expected to be distributed generation (DG), which is based on renewable energy sources (RESs). However, the rapid growth of power supply systems must also improve its reliability and supply quality. Interconnecting the DG systems to each other and to conventional power systems to operate in parallel in order...
Distributed generation technologies such as photovoltaic, fuel cells and micro turbines are emerging. However, these sources require interfacing units to provide the necessary crossing point to the grid. The cores of these interfacing units are power electronics technologies such as inverters since they are fundamentally multifunctional and can provide not only their principle interfacing function...
Electricity demand has been rapidly increasing globally. More power plants and transmission lines are built to satisfy the customer demand. However, as distributed generation (DG) costs are less than the combined cost of power plant and expansion of the distribution and transmission systems. DG technologies are becoming potential contributors of electricity supplied by electric utilities. To meet...
A key element at the grid side of future smart power systems is the inverter. This paper introduces a robust hierarchical control strategy for realistic distributed power system with power electronics inverters as front-end. The proposed control architecture maintains the three phase voltages and frequency in the grid within limits and provides power sharing between the units according to their rating...
Modularity offers large potentials to the rising demands of modern power supply systems. It ensures an advanced level of flexibility and adaptability required by expanding grids. In this paper an introduction to modular design strategies in combination with standardized interfaces is given. Differences in application of modular design strategies to hybrid power system (HPS) hardware and software are...
At present, power supply systems all over the world are facing challenging situations where they have to be extremely flexible, reliable and expandable. Existing grids have to be modified due to the growing proportion of distributed and renewable energy sources. Power electronic inverters are the key components to couple different energy conversion systems and to manage their operation. To fulfill...
-As the penetration of distributed energy resources (DER) in existing conventional grid increases leading to the distributed generation (DG) concept. The use of full scale dynamic simulation to analyze load variation, the frequency and voltage of the power system in DG provides complex tasks to researchers and planners such as huge computational time. This paper introduces modeling approach for power...
This paper describes how different power sources of a hybrid power system may be connected together through a DC bus and then to a grid through a main inverter in such a way that a decoupling between the state variables of the power sources and the state variables of the grid is achieved. A layout showing such a structure will be presented, and an online control strategy for this layout will be developed...
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