The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Power distribution systems (PDS) in urban areas suffer from different types of problems. One such major problem is accidental or scheduled interruption. In electrical networks, effects of interruptions are usually quantified using a set of reliability indices, namely the System Average Interruption Frequency Index and the System Average Interruption Duration Index. Installation cost (fixed cost) and...
Voltage quality is an essential requirement in the operation of electricity distribution systems. At consumer busbars, the deviation from the nominal voltage has specific ranges, prescribed in technical regulations. A widely chosen voltage correction approach is to use reactive power compensation. Capacitor banks are used for this purpose in highly loaded networks, but their placement and sizing require...
The optimal capacitor allocation in electricity distribution networks (EDN) plays a meaningful role in voltage profile improvement, power factor amelioration and also power losses minimization. This work presents two comprehensive optimization algorithms based on metaheuristics as a comparison to solve the capacitor allocation problem in modern distribution networks. Thus, the problem of optimal capacitor...
An important requirement of a distribution network is that the voltage variations at the end user terminals should be as low as possible. This paper investigates a particular approach that highlights the influences which the connection of shunt capacitors may have over the solutions for voltage control in distribution networks. The problem of optimal capacitor allocation for the minimization of bus...
Capacitor banks (CBs) are used for reactive power compensation in electricity distribution systems. In order to achieve the best effect, CBs placement requires optimization. Metaheuristic computational intelligence algorithms are methods widely used in the literature for this purpose. This paper presents a parallel Particle Swarm Optimization algorithm for bus voltage optimization. The results of...
This paper shows how the use of different types of tariffs by electricity suppliers influences the optimal functioning of a trigeneration system designed to supply an electricity, heat and cold consumer.
Reliability optimization in power distribution systems is obviously an important problem. The power distribution system supplies electricity to their consumers maintaining economy as a well as reliability. In this paper, an algorithm intending for cost minimization in electrical distribution systems is proposed. Combing two well-known meta-heuristic algorithms namely Genetic Algorithm (GA) and Quantum...
The low voltage (LV) electric network represents an important link in distribution chain, because it supplies loads concentrated in cities, suburbs and rural areas. Due to the distribution of single-phase loads on phases and their random instant demand values, in these networks can occur the load unbalance. These unbalances increase energy losses and risk of capacity constraint violation and also...
The paper presents an analysis of voltage dynamics for a test system, considering or not renewable sources integration in the electricity grid. The analysis was carried out for the n-1 contingency criterion. The simulations were conducted using PowerFactory DigSilent software and the New England 39-bus test system.
The paper presents a comparative study between the effects on voltage stability of the integration of a wind farm into the electricity grid with or without voltage dependent loads in the context of different locations of a synchronous compensator in the grid. The P-V curves are built by using PowerFactory DigSilent 15.2.2 and a DPL script that implements a simplified form of the Continuation Power...
Unlike traditional electric systems based on centralized power generation with large and very large capacities, the use of Renewable Energy Sources (RES), largely based on smaller capacity power sources, led to defining a new concept, known as Distributed Generation (DG). Beyond the obvious advantages related to environmental protection, greenhouse gas emissions reduction and technical and commercial...
Static VAR compensation is used as a fast response mechanism for dynamic voltage regulation in transmission grids. SVCs use electronically controlled shunt capacitors and reactors to inject or draw reactive power from the grid. This paper investigates the performance of standard Particle Swarm Optimization and Genetic Algorithms and proposes a hybrid GA-PSO approach for choosing the optimal buses...
Reliability Redundancy Allocation Problem (RRAP) in Wireless Sensor Network (WSN) system is obviously an important problem. The basic function of WSN system is to provide surveillance data transmission over a specified area maintaining minimum power consumption (minimum cost), occupying minimum volume and weight of system components with a reasonable level of reliability. In this paper, a decision...
In this paper, an algorithm aiming for reliability in wireless sensor networks (WSN) will be discussed. Reliability optimization in WSN is obviously an important problem, because a more reliable network can secure a correct, durable, and complete communication. Power consumption optimization in WSN is highly necessary in order to have a reliable sensor network because consumption of power by WSN is...
This paper presents a medium term load forecasting methodology based on a mixed statistical computational intelligence model. The methodology can be used by any entity (such as transmission and distribution operators, electricity suppliers or energy managers) interested in planning different activities with electricity. The methodology produces daily load profiles forecasts for all the 365 days of...
The paper presents a self-organization based integrated model for customer classification and load profiling in distribution systems. The consumer classification in consumption classes characterized by typical load profiles is made using information provided by Smart Meters. For determination of the consumption classes, every customer is characterized by the following primary information: daily (monthly)...
This paper presents a trigeneration energy facility, optimization approach based on genetic algorithms and specialized software. The trigeneration facility is considered as an energy hub. This type of plant is able to simultaneously replace in households the electric power supplied from the system, centralized heating and/or hot water generation and air conditioning or refrigeration installations.
The paper presents the impact on voltage stability of the integration of renewable energy sources into the electricity grids. The P-V curves are built by using the Power System Analysis Toolbox (PSAT) and the continuation power flow (CPF) method. Different levels of wind penetration were considered in the three study cases presented in the paper.
Electric vehicles have lower specific energy consumption while driving, reducing in this way the environment pollution and the costs with transportation. In recent years the number of this type of vehicles has increased dramatically around the world. While parked these vehicles consume electricity from the grid to charge their batteries, as defined in literature G2V (Grid to Vehicle). At the same...
State estimation is used currently in wide area electrical systems for real time analysis. Studies have shown that in HV transmission networks, where system-wide synchronized phasor measurement units are installed, voltage angle measurements can be included in the input measurements data set, with the result of improving the estimation precision. The authors developed in previous papers a SE algorithm...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.