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To increase the maximum possible benefits of technical, economic and environmental aspects, the optimal sizing and sitting of distributed generation in distribution system has always been challenging for customers as well as to utilities. The objective of optimum sitting of distributed generation in a distribution system is to reach suitable operation of such systems with minimization losses of the...
A new reliability assessment method for distribution system with distributed generations (DGs) is proposed in this paper, aiming to quantitatively analyze the undesired impact caused by passive islanding detection failure. Firstly, the paper analyzes the impacts of DG interconnection on auto-reclosing operation and system reliability due to failure of anti-islanding detection when a transient or permanent...
This paper investigates the benefits of smart loads in an industrial microgrid. Such smart loads offer the microgrid greater flexibility to regulate frequency for large fluctuating load scenarios, commonly encountered in industrial plants. A case study of stone crushing facility is analyzed when it is fed by natural gas engine driven generator sets (also known as ‘gensets’). The problem of genset...
With the progress of distributed generators, island partition gradually meets the requirements of practical engineering application. In this study, according to the radial structure and service restoration process of intelligent distribution system, this paper established the island partition model takes account of key factors as the load priority, load controllability, power balance and equipment...
Caribbean islands such as the Bahamas, Grenada and St. Lucia are affected yearly by seasonal hurricanes and tropical storms which can lead to blackouts and voltage variations of the power system. The Bahamas in particular consists of 16 isolated island grids which inhabits a population of 300,000. Diesel generators are employed to provide electricity for each island, but with increasing oil prices,...
This paper describes intelligent ways in which distributed generation and local loads can be controlled during large system disturbances, using Local Power Controllers. When distributed generation is available, and a system disturbance is detected early enough, the generation can be dispatched, and its output power can be matched as closely as possible to local microgrid demand levels. Priority-based...
Installation of a large number of small sources called distributed generation creates many problems in proper control of national (and European) power grid. At the same time new technologies especially power electronics and measurement data computing associated with smart grid allows to use better and conscious these distributed sources. This paper describes what problems the distributed generation...
Hawaii Electric Light operates an autonomous power system on the island of Hawaii with a diverse mix of generating resources. Although the system is small, with an annual peak in 2009 of less than 200 MW, the power system balancing and frequency control is provided through a conventional centralized Automatic Generation Control system. The mix of generation resources on the Hawaii Electric Light System...
With distributed generation technologies becoming more and more sophisticated and the progressive development of distribution automation technology, the application of distributed generation in distribution power system is gradually broad and diverse. This paper first lists the common operation modes of distributed energy sources, then analyzes the different characters of distributed generation running...
Distributed generation (DG) has emerged as a key option for promoting energy efficiency and use of renewable energy sources in alternative to the traditional generation. The DG sources are generally integrated to the network mainly to reduce the power losses, avoid congestion, improve voltage profile and provide electricity during peak load. This paper presents a method to select the load buses for...
Many distribution systems nowadays have significant penetration of distributed generation (DG) and thus, islanding operation of these distribution systems is becoming a viable option for economical and technical reasons. The DG should operate optimally during both grid-connected and islanding mode, which can be achieved with change in operating strategy. This paper summarizes the excited methods already...
Distributed Generation (DG) sources have attracted serious attention due to their potential solution for some issues, like the deregulation in power system, increasing the power consumption and the shortage of transmission capacities. The optimal placement of DG is necessary for maximizing the DG potential benefits in power system such as maintaining and/or improving reliability and stability. There...
This paper describes the possible evolution of Italian distribution system in facing the growing penetration of Dispersed Generation (DG), in the perspective of smart grids. As for the Italian system, after discussing the Hosting Capacity of MV distribution networks, it is recognized that some challenges are to be faced due to the increasing amount of DG. Even though current technology provides satisfactory...
The connection of generating sources in the distribution systems is on the increase worldwide. If on one hand this practice brings well-known benefits for the system, on the other, there are several institutional barriers that make difficult its feasibility. This way, the Brazilian National Electric Energy Agency (ANEEL) has developed the so called “Distribution Procedures”, which is a set of rules...
Microgrids are defined as an area of network that is capable of operating autonomously from the rest of the electricity system. They achieve this by containing enough energy resources to meet all incorporated electrical (and thermal) loads, and by coordinating control in order to meet the participants' aims, and afford adequate quality/reliability of power and heat supply. From an economic point-of-view,...
Microgrid technologies are highly developed in low voltage networks, improving the power supply reliability and energy efficiency. Therefore, in this paper, the concept, including the configuration, principle and operation of microgrid, will be specified, comparing the microgrid with the prior distributed generation. Additionally, in order to justify the feasibility, the economical benefit analysis...
Fossil fuel generators like diesel and natural gas gen-sets are the mainstays of microgrids for reliable power generation. This paper investigates different methods or modes to maximize fuel efficiency of the online generators in a microgrid where a substantial portion of the total generation capacity comes from fossil fuel generators. Energy storage is used to facilitate high efficiency operation...
Islanding detection is an important issue for distributed generation operating with main network. To solve the problem of reliability and sensitivity of conventional vector shift method, this paper presents a composite islanding detection method utilizing both angle change and frequency variation derived from distributed generator terminal voltage. The method consists of main criterion and auxiliary...
Microgrid is profitable to mitigate the expansion pressure of transmission grid and achieve higher reliability at the same time. It also provides an ideal platform for the application of renewable energy. Network characteristics analysis is the basic element in reliability assessment of microgrid. This paper discusses two methods of microgrid construction according to China's distribution system,...
Distributed generation draws increasing attention because of the energy shortage and environmental protection considerations. Furthermore, distribution power generation can improve the power system stability and reliability, providing the local power supply economically. Microturbine based power generation has many applications in distributed generation. In this paper, a mathematical model of a microturbine...
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