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The increase in penetration levels of distributed generators like PV and Wind in a distribution system makes the IEEE 519 standard to be a vital aspect towards power quality. The network resonance has been described by IEEE 519 as a major contributor towards the harmonic distortion. Non-linear loads such as transformers, machines, silicon-controlled rectifiers (SCRs), solid state devices, power transistors,...
In this paper, a method for minimizing the fuel consumption in a diesel generator set using a wound rotor synchronous generator (WRSG) is introduced. The proposed method uses direct monitoring of fuel flow rates and generator output to actively search for an optimal stator voltage. By weakening the field of the WRSG, the overall efficiency of the system is increased. Simulation models of the diesel...
Automatically generating unit tests is a powerful approach to exercise complex software. Unfortunately, current techniques often fail to provide relevant input values, such as strings that bypass domain-specific sanity checks. As a result, state-of-the-art techniques are effective for generic classes, such as collections, but less successful for domain-specific software. This paper presents TestMiner,...
Based on the deficiencies for risk indicators of fault probability and consequence's application in distribution systems, the strategy of risk assessment for system operation based on health and importance indices is proposed. The health index oriented to system running states and importance index geared to the user diversity are defined, by comprehensively thinking about the development situation...
Random numbers are useful for a variety of purposes. A discrete representation of them can be obtained from pseudorandom numbers generators. This paper presents PseudoRandom, a prototype of a hypermedial educational material, which approaches the subject from a multidisciplinary and constructivist perspective.
This paper addresses the problem of the fault detection problem for discrete-time Markovian jump systems under an event-triggered scheme. The event-triggered scheme from the plant to the fault detection filter is utilized to reduce the frequency of transmission. Our attention is focused on the design of a fault detection filter such that the residual system is stochastically stable and satisfies some...
The profit based unit commitment (PBUC) problem determines an optimal unit commitment schedule for a generation company (GENCO) participating in a deregulated environment with the aim of maximizing its profit. This is done using predicted prices of energy and other ancillary services including supply of reserve power. Several techniques have been proposed in literature to solve the optimization problem...
Demand Side Management (DSM) has been become a popular option for improving electricity system operations and reliability. Moreover, Demand Response (DR) programs provide superior efficiency and flexibility to their users. This paper proposes a method to assess system reliability and evaluate the specific contributions made by spinning reserves (SR) and DR. The method structurally and spatially decomposes...
This paper presents an assessment of the impacts of Demand Response (DR) programs and distributed generation (DG) in the chargeability of the Colombian power system. Initially, several indexes are defined to account for the impact of single contingencies in the chargeability of the Colombian power system under different operative scenarios. Then, the most critical operative scenario in terms of number...
This paper presents secondary voltage control of power grid using identification of voltage stability index and voltage control areas. Unlike, the traditional secondary voltage control in North America performed directly by switching capacitor banks and other reactive power sources, in the proposed approach generators are chosen first to perform secondary voltage control. The participation of generators...
The ultimate aim of this research is to develop a Rule Based Machine Translation System (RBMT) using sentence simplification. The sentence pattern for English is SVO and Tamil is SOV. Complex and larger sentence are not easy to parse and translate. So, the sentence simplifier is also accommodated in the rule based system to split a large sentence into simple multiple sentences. Machine translation...
The emerging potential of distributed generation (DG) is feasible to be conducted through microgrids implementation. A microgrid is a portion of the electrical system which views generation and associated loads as a subsystem, with the ability to operate both grid connected or islanded from grid, thus maintaining a high level of service and reliability. The existing grid infrastructure, the distributed...
This paper examines the combination of two very usual phenomena occurring in an emerging power system, such as the Provincial Interconnected System (PIS) in San Juan-Argentina. The first of these phenomena is known as fault induced delayed voltage recovery (FIDVR). This article discusses some aspects of the influence of induction motors on voltage sags. Another phenomenon analyzed is the increasing...
The aim of this work is to evaluate the impact of the incorporation of dynamic voltage support and reactive power injection requirements in PV systems connected at Provincial Interconnected System(PIS) of San Juan-Argentina projected up to the year 2024 under different levels of penetration. To this aim, the calculation of a severity indexes is proposed. It can be concluded that the capacity to withstand...
A transposition tree T can be defined over permutations where the positions within a permutation define the vertices of the tree and an edge (i, j) of T signifies that the symbols at the positions i and j can be swapped. A Cayley graph of a permutation group can be generated by a transposition tree T where the edges of T form the generator set. Identifying the diameter value of a Cayley graph helps...
Structural analysis for fault detection and isolation (FDI) is an efficient method for designing structured residual generators for model-based diagnosis. It generates a number of diagnostic test candidates, whose number may be large in case of complex systems. This paper proposes a method for selecting residual generators from a possibly large number of candidate equation sets using a diagnosability...
With the increase of the scale of the power grid and the improvement of the intelligence degree, the rationality and accuracy of the schedule power flow (the schedule) are becoming more and more serious. In this paper, by analyzing the relationship between input and output in the process of power flow calculation, the five main factors influencing the line active power deviation and the main cause...
In this paper, a competitive bidding based congestion management strategy is developed for a pool type electricity market model. The proposed congestion management strategy alleviates the transmission congestion by using rescheduling both the real and reactive power output of generators. The separate bids for real and reactive powers are invited from all participating generators in the congestion...
Wind diesel power systems (WDPS) are isolated microgrids which combine diesel generators (DGs) with wind turbine generators (WTGs). The presented WDPS consists of a DG, a WTG, load and a low speed Flywheel Energy storage system (LS-FESS). First the dynamic models of the WDPS components are explained. Next, the LS-FESS active power control in the operation modes of Wind-Only (WO), where only the WTG...
We present a new general construction of MDS codes over a finite field Fq. We describe two explicit subclasses which contain new MDS codes of length at least q/2 for all values of q ≥ 11. Moreover, we show that most of the new codes are not equivalent to a Reed-Solomon code.
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