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In a response to economic growth, electric power utilities installed many electric power facilities to meet power demand. However, these facilities have aged and should be replaced in the near future. Moreover, the demand is said to constantly increase. Therefore, it is necessary to partially upgrade facilities. In this paper, we upgrade transformers with one of the financial engineering techniques...
Microgrid (p, g) is the present buzzword in the power industry with the new approach that it provides the grid operators to operate the grid. The unexpected weather events, increased electricity needs and potential threat to the cyber-security of the grid have raised several questions over the reliability of the grid with μ,gs turning out to be the pragmatic solution to improve reliability. In this...
This article addresses the issue of diagnostics of the complex technical systems by the example of digital substations via the analysis of the existing diagnostic methods and approaches to mathematical modeling with the subsequent realization of the digital substation hardware-software model. The question of diagnosis is relevant in view of the fact that the existing energy infrastructure in Russia,...
This article concerns reliability assessment of an electricity distribution substation surge protection system, composed of surge arresters. For this purpose a reliability analysis is performed and also a surge protection system reliability mathematical model is suggested. Based on it mathematical formulae are worked out intended for practical calculation of proper reliability indices values. The...
In this paper, an algorithm is proposed to investigate the improvement in HV network reliability when the number and location of Remotely Operable Switches (ROS) is changed. Specifically, the Particle Swarm Optimisation PSO is employed to identify; (i) optimal placement of remotely operable protective devices and (ii) the optimal sequence of reconfiguration and restoration of the supply based on a...
The typical power distribution systems are in radial configurations in which the connection is radial and the power flows in one direction from the substation to the customer's loads. Due to the increased need for more reliable power on the distribution side, and since most of the interruptions experienced by customers originate from the radial distribution side, the future distribution power systems...
Automation systems for substations based on IEC 61850 simplify the design, installation, and maintenance of the system with a significant cost reduction. Indeed, the industry considers safety and reliability of real-time systems an essential factor. In this scenario, GOOSE messages used in IEC 61850 communication networks for protection, control, and automation of substation are very important. This...
The reserve grid is a redundant MV grid, which serves as an emergency power system (EPS). It is designed to compensate interruptions of the MV grid or substations by offering an independent connection to an additional substation. The challenge is to find the optimal topology regarding costs and reliability. The locations of the customers and the substation have to be considered in the planning of...
Traditionally, reliability evaluations for substation configurations and distribution networks are performed separately and substation reliability evaluation only focuses on a single substation. This paper presents a technique to assess the reliability of multiple substations with associated distribution networks. Based on Markov modeling, a clustering approach, a linear programming algorithm and...
This paper presents the optimal maintenance of substation equipment. Along the equipment lifetime, the failure rate tends to increase gradually due to aging deterioration and daily operation. Therefore, the failure rate of equipment is proposed to be modeled by the appropriate Weibull distribution. Maintenance can keep equipment in good condition, but it incurs cost. The maintenance strategy typically...
Mathematical model of small scale HPP was developed for simulation of HPP electricity production in market conditions. Paper also presents approach for evaluation of power supply reservation possibility in distribution network using small scale HPP that operates in liberalized market conditions. Proposed approach allows evaluate theoretical possibility of HPP to improve reliability of power supply...
This paper presents a methodology to evaluate technical and economic benefits achieved by deploying remotely operated switching devices (ROSDs) envisaging Self-Healing strategies. The network is firstly divided in several zones, having pre-existent ROSDs as boundaries and selecting the zone with higher energy not supplied (ENS). Thereafter, a failure event on the selected zone is evaluated with a...
This work proposes a methodology for optimized allocation of switches for automatic load transfer in distribution systems in order to improve the reliability indexes by restoring such systems which present voltage classes of 23 to 35 kV and radial topology. The automatic switches must be allocated on the system in order to transfer load remotely among the sources at the substations. The problem of...
In order to develop effective methods for reliability centred maintenance and to model operational reliability for transmission and distribution power systems, different reliability growth tools are implemented. The purpose of such reliability growth models is to identify all the multiple situations when changes on reliability for a given system appear, and to determine some specific indices. Crow-AMSAA...
In this paper, the placement and sizing of Distributed Generators (DG) in distribution networks are determined using optimization. The objective is to minimize the loss and to improve the reliability at lowest cost. The constraints are the bus voltage, feeder current and the reactive power flowing back to the source side. The placement and size of DGs are optimized using a combination of Discrete...
A novel fast enumeration based reliability assessment algorithm based on a probabilistic load flow approach considering nodal uncertainties is proposed in this paper. The frequency and duration indices for each load point and the expected energy not supplied as well as the expected interruption costs are derived with the proposed methodology. By reducing the number of necessary system states a huge...
The paper gives the main idea of substation's switchgear's reliability evaluation module as a part of software that was developed in Riga Technical University in frames of project “Information technology to ensure the sustainability of generation and transmission grid”. The module allows easily evaluate switchgear's up-state's probability and interruption time for large amount of different types of...
A hybrid model for substation locating and sizing is presented in this paper to work out the number of newly-built substations and capacity-expansion, load assignment and optimal size of substation. Geographic information system is used as a platform to manage a great deal of data in this method, in which the optimum assembly model of the substation capacity and the number of substations be the first...
A reliability study of the six western transmission lines maintained by EDELCA, the major power generation and transmission utility in Venezuela was completed. The main purpose of this paper was to estimate a set of reliability indices for each power transmission line, using probabilistic techniques such as the Markov approach and the state enumeration method for the load points system assessment...
A complete reliability study of three large transmission substations of EDELCA, the major power generation and transmission utility in Venezuela was made.
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