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Supplying electrical energy to the load on demand, economically and with acceptable levels of reliability and service quality is the main task of a distribution system. Energy distribution reliability is important in the competition conditions in electricity markets because consumers directly supply energy. Therefore, it is not enough to estimate how reliable the distribution system is at present...
Wind power has become a candidate to replace some or part of the conventional generation to meet the continually increasing electricity demand. Yet, the stochastic nature of the wind speed and the rapid changes of wind turbine output increases the complexity of planning and operation of power systems. In this paper, a cost benefit analysis is developed for measuring the benefits of integrating wind...
Demand Response (DR) is an effective tool for electric utilities to handle challenges associated with increased network requirements related to operating flexibility. These challenges are the result of increased uncertainty in loading and generation particularly as the penetration of renewable energy sources (RES) is increased. This paper proposes a new bus weighting methodology for distributing the...
The microgrid reliability assessment is gaining notorious attention as distributed generation systems are being increasingly installed. The conventional approach to perform this analysis is by means of the Monte Carlo method which may lead to long-lasting simulations when elaborated models are considered. To reduce the overall simulation time, this paper combines a detailed analytical microgrid modeling...
Maintenance strategy impacts the reliability of distribution network directly. Common distribution network maintenance strategies contain corrective maintenance and preventive maintenance. However, the existing reliability assessment methods ignore the effects of preventive maintenance. This study showed the influence of preventive maintenance on the system failure rate by describing the preventive...
The advancement in regulatory policies, promotion of Solar PV technologies paved way towards maximum use of solar based sources for residential, industrial and commercial applications. This paper presents the impact of grid connected rooftop Solar PV on reliability of a distribution system. A Case study is undertaken from a typical utility system in Kerala. The distribution system considered is 11kV...
This paper presents a maintenance strategy for overhead lines based on condition monitoring and system reliability assessment. A quantitative relationship between the condition monitoring data and failure rate of overhead lines is established. The system reliability is evaluated using monitoring data; the reliability benefit due to the maintenance of each line is quantified; and the maintenance ranking...
Access to a computational tractable method for representing the system more realistically has always been an important issue in power system reliability assessment. The Post Optimal Analysis (POA), as a well recognized technique to attack a set of similar optimization problems, has been successfully used to assess the reliability of composite systems. This method exploits the similarity of the 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...
This paper proposes a methodology to assess the technical and economic impacts of interconnecting Distributed Generation, with the possibility of islanding operation, directly in the customers of the distribution systems. This methodology allows to evaluate the effects on the reliability indexes of the distribution systems due to the interconnection of these kind of generation sources. Besides, it...
Reliability calculation is the most important concern in designing and planning of distribution systems, which is considered, in terms of the economical concerns, with minimal interruption of customers. Storage devices are usually used for storing the electric energy while the electric price is low, and deliver their reserved energy when it has financial profit. Also, it could be effective for decreasing...
In order to prepare for the intelligent management of power companies, it is significant to research on reliability evaluation method of power communication network. In this paper, 19 power corporations are chosen to be evaluated. The FAHP and entropy method are combined to make out the indicator weight. The restricted coefficient method is used to de-fuzzy the evaluation results. Then it improves...
To date, many inverter topologies have been proposed in the literature with each exhibiting certain advantages and disadvantages. These inverters are however mostly proposed with their reliability indexes left unexplored. The main reason for a lack of reliability assessment might be a lack of existing quantitative techniques that can be used for computing a mathematical index for associating with...
Service life prediction is an important aspect of structural safety evaluation. Based on periodical or non-periodical testing results of existing structures, some comprehensive evaluation indices of time series can be obtained by reliability assessment or other evaluation methods. For the problem of remaining service life prediction, existing structures can be regarded as grey systems. Combined with...
Aiming at the problems of traditional reliability data processing method in dealing with Zero-Failure binomial data, it has proposed a reliability assessment method which do not to make use of the few binomial data but the metric data. It could reduce the uncertainty in the reliability assessment and analysis. The arming reliability assessment of a certain fuse was taken for an example finally. The...
It mentions a new method of distribution reliability assessment based on Bayesian network timing simulation. It uses node model "causal" to change the gotten or lost duration of load points combined with the characteristics of Bayesian diagnostic reasoning and causal reasoning. it can simply effectively obtain the index of distribution system reliability and find out the weakest link of...
In this paper, a novel approach is presented for constructing the Bayesian Network (BN) that can be used in detailed reliability assessments of a power system based on the loss of load probability (LOLP). This method, which is applicable to large and complex power systems, is based on the learning capability of BN from data. In order to obtain training data, state sampling method of the Monte Carlo...
Although innovation plays an important role in attaining competitive advantage for any organization, no currently available scale is adequate for the measurement of organizational innovation in nonprofit organizations (NPOs). Through a concise review of the literature, three dimensions of nonprofit organizational innovation (NOI) were identified. A cross-sectional survey methodology was used to collect...
To find an effective model for safety assessment of civil engineering structures under the uncertainty and data lack, the unascertained set was introduced to measure the reliability and a safety assessment model with credible identification principle was set up. Then, engineering practice for the reliability assessment of a cable-stayed bridge showed that the model proposed here can complete the safety...
The reliability assessment allows the distribution utilities to make more judicious investment decisions since they can balance the technical and economic aspects of the supply quality. However, to accomplish the reliability assessment of any power distribution network it must model the cause-and-effect relation between the fault locations and the affected customers. This work aims to present a method...
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