Due to uncertain nature of wind and photovoltaic power units, the participation of this units in electricity markets is subjected to significant deviation penalties. This issue leads to despondency or even admission of these units in the competitive environment. With regard to this fact that the low deviations are available when predictions are performed in a short-term horizon and also distrib...

The main purpose of this paper is to discuss the basic understanding of power quality in relation to the distributed generation. Due to considerable overlap between two technologies, disturbances affecting the power quality, which are mainly cause by the addition of Distributed Generation (DG) on the existing power system network. Injection of the DG into an electric power grid can affect the v...

application of distributed generation (dg) units in distribution networks has increased in recent years. sizing and sitting of dg units are two important factors which should be considered, especially for reduction of power losses in distribution system. this paper presents a new approach for dg placement in distribution systems using the mixed integer nonlinear programming (minlp). this approa...

The conventional practice for usage of distributed generation(DG) is in distribution system for loss reduction, voltage profile improvement etc. Recently the distributed generations were used in transmission network as well for overall performance improvement i.e. reduction in losses, reduced cost of electricity, congestion management, improvement in voltage levels. The practice of distribution...

This paper discusses the use of distributed generation (DG) for improving the supply reliability in distribution systems. The first part of the paper contains the results of a simple analytical study of the reliability for individual customers with distributed generation on-site. The difference between disconnector-type interfaces and breaker-type interface is emphasised. In the second part of ...

The traditional approach in electric generation is focused on centralized plants producing electricity which is transmitted and distributed over long distances through the networks. In contrast, using distributed energy resources, much smaller amounts of energy are produced by numerous small, modular energy conversion units, which are often located close to the point of use. Therefore, Distribu...

The microgrid concept provides attractive solutions for reliability enhancement of power distribution systems. Normally, microgrids contain renewable-energy-based Distributed Generation (DG) units, which their output power varies with different environmental conditions. In addition, load demand usually changes with factors such as hourly and seasonal customer activities. Hence, these issues hav...

This paper is an intent to quantify the impact of distributed generation (DG) over active and reactive power losses on distribution system. The novelty of this paper is the use of new a relevant index: DG penetration level, DG dispersion and DG technologies. Several simulations over a simple distribution system were done. Implications about location and size of DG units were considered using pe...

Distributed Generation, or DG, involves utilization of small generators that are distributed in a power network, to supply the electric power demands of utility customers. This paper presents the small signal analysis of droop based generation control schemes for parallel connected DG inverters comprising of active powerfrequency and reactive power-voltage controllers. Small-signal models are d...