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Distribution networks are increasingly hosting embedded generators, most of them converting renewable energy primary sources. These units are usually interfaced with the main network by means of static power converters. Grid codes have recently introduced stabilizing functions to engage distributed plants in supporting the main system stability during network events and consequent voltage/frequency...
The stability conditions of the power supply system with solar panel and diesel generator are studied. It is shown that the ratio between solar panel and load currents affects the stability of systems with distributed generation. The extension of stability workspaces is achieved by using the storage battery as a device that increases the system stability.
This paper reports the design and implementation of a mobile microgrid system that integrates multiple portable gensets and renewable power sources e.g. photovoltaic panels, in a modular ‘plug and play’ scheme that achieves high power capacity and flexible operating conditions. Battery storage is included to provide silent mode operation, to support transient loads and to absorb excess capacity. Both...
The paper is devoted to the features of short-circuit current interruption under the conditions of small-scale distributed synchronous generation connection to medium voltage (MV) and low voltage (LV) power supply systems. Distributed generation (DG) even in a case of the unidirectional power supply has a great impact on overcurrent relay protection sensitivity and selectivity. Connecting DG leads...
In this paper,1 the equations are formulated to model the dynamic behavior of a wind turbine coupled to the electric grid through a Unified Power Flow Controller (UPFC). This concept is demonstrated in order to treat wind plants more as a controllable energy source rather than a negative load, which is the current trend among renewable energy systems. The results of this research include the determination...
The main objective of this work is to present the analysis of the behavior of synchronous generators of an electrical energy independent power producer, with their respective automatic voltage regulators (AVRs) and speed governors, in parallel with a power authority distribution system, for the distributed generation studies. It is highlighted that this generator is driven by a steam turbine with...
Growing depletion of natural resources and the Kyoto Protocol have aroused global attention to renewable energies. In Taiwan, the goal of real power generation from renewable energies is 4% of total generation in 2012 and 18% in 2020. Although renewable energies can mitigate the green gas effect, penetration of these distributed generations may change the operation scheme in the utility. One of the...
This work is concentrated on transfer of power quality disturbances in active distribution network containing small hydro power plants (SHP). Investigations are based on the dispersed synchronized measurements using power quality recorder installed in the two substations connected to the same medium voltage line. Dynamic aspect of SHP work represented by switching on capacitor banks are tracked in...
Integration of small distributed generation (DG) units to weak distribution system is a major concern for power system engineers. Recent grid standards demand small DG operation with power factor control mode. Lack of sufficient reactive power support brings the problem of slow voltage recovery under post-fault condition. This paper presents a comprehensive VAR planning with a mixture of both static...
This paper analyzing influence of distributed generation (DG) on transient stability of power system network operating parallel with large renewable energy resources (RES) power plant. The study is performed in hypothetical power system network envision in the future which contains a large number of DG. Network behavior when subjected to disturbance is compared with different level of DG penetration...
It is known that the increasing penetration of Distributed Generation (DG) implies different technical problems in the operation of distribution systems. This paper focuses the electrical Power Quality (PQ) aspects. DG can be responsible for different PQ problems, like poor voltage quality, unwanted protection trips on healthy feeders, and “islanding”. Voltage quality, in particular, can become a...
This paper reviews the impact of distributed generation (DG) penetration on power system stability. It discusses the dynamic impact of stand-alone or grid-connected DG or hybrid power systems on the transient and small signal stability of power systems. Modeling and simulation techniques and software required for such studies and applicability of intelligent techniques in assessing transient and small...
This paper investigates the influence of a synchronous distributed generation on a Brazilian real network. The distributed generation represents a small hydro power plant with total capacity of 30 MW. The model of the network is developed in a professional computer software package. Simulations are carried out considering voltage dependency of static loads and different DG penetration levels. The...
The existing distribution networks are designed based on the assumption of unidirectional power flows. The amount of distributed generation (DG) is, however, constantly increasing which creates a need to revise the current network operation and planning principles. This paper focuses on voltage level management issues related to DG. The effect of different kinds of voltage level management strategies...
This paper deals with the protection system in distribution networks with distributed generation. It describes the dynamic influences of synchronous generators on the direction determination of protection relays during network disturbances. Therefore the dynamic behaviour of the measured electrical quantities during network disturbances is derived. A relay-model is implemented to study the behaviour...
The main task in this paper is to present a performance analysis of a distribution network in the presence of a synchronous generator with its speed and voltage regulators, in parallel with the distribution system, for distributed generation studies. Must be highlighted that this generator is driven by a steam turbine, and the whole system with regulators and the equivalent of the power authority...
The main task in this paper is to present a performance analysis of a distribution network in the presence of a synchronous generator with its speed and voltage regulators, in parallel with the distribution system, for distributed generation studies. Must be highlighted that this generator is driven by a steam turbine, and the whole system with regulators and the equivalent of the power authority...
Magnitude and duration of the short-circuit current supplied by induction generators is a matter of concern. Induction generators are mainly applied to produce electricity through wind turbines. Several papers showing analytical studies on short-circuit current have been published, but just a few with experimental results. Experimental results of 4 to 10 kW induction generator are presented. Four...
In the future, with the high penetration level of the distributed generation, their decoupling from network during the fault will eventually cause critical consequences. In order to avoid such situation, it is necessary to perform the transient stability analysis. The paper investigates the hybrid methods for fast transient stability assessment which are able to detect quickly the loss of stability...
Planned islanding application, also known as intentional islanding, is an early utility adaptation of the Microgrid concept that is being promoted by major utilities around the world. The main objective of planned islanding projects in Canada is to enhance customer-based power supply reliability on rural feeders by utilizing an appropriately located independent power producer (IPP). This paper considers...
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