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Grid connection of distributed generation would have a certain impact on safe and stable operation of receiving-end network, so systematic analysis on it would be significant. The method for comprehensive assessment on effects caused by grid connection of distributed generation on power grid is presented. The assessment system is divided into steady-state operation assessment, reliability assessment,...
Micro-grids are bits of a power circulation organize that supply various loads, and incorporate distributed generation (DG) like: wind and solar generators. Optimal power flow (OPF) is considered with the goal of limiting either the power circulation misfortunes, or, the cost of influence drawn from the substation and provided by (DG) units. This paper analyzes two systems: a system with no transmission...
As the demand for data increase and the need for higher density network load, greater resiliency and efficiency a need for a reliable power distribution and back up is required. Currently our −48VDC distribution has limitation in size (kW), length of cable run and large battery reserves. Higher Voltage DC offers a number of benefits for Telstra from reduced cable size, simplified distribution set...
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...
A reliability assessment and capacity credit evaluation are presented in this study. The Probabilistic Production Costing Method (PPC) is used to assess the impact of variable generation (VG) on the overall reliability using metrics such as (1) Loss of Load Probability (LOLP) and (2) Expected Unserved Energy (EUE) indices. We also define capacity credit of VG in probabilistic terms and provide a computational...
The hospital's electric power system is typically complex, with a round the clock, 365 days per year required mission. Although normally the supply of electricity is taken for granted, natural disasters and terrorist attacks remind us how dependent we are on electricity and how fragile the system can be. In order to cover such a topic, resilience has been defined as the ability of a system to reduce...
In this paper a new model is proposed to schedule the capacity of both up and down spinning reserve (SR) considering transmission constraints. Up SR is seen as the most important resource to cope with many contingencies and it is well studied, while the down SR is ignored by many papers especially when network constraints are considered. Ignoring the down SR would cause sub-optimal or even unfeasible...
Increasingly stringent regulations on emission control and energy efficiency operations drives the maritime industry towards hybrid solutions incorporating energy storage and other alternative energy sources into marine power systems. In particular, commercial all-electric hybrid vessels with dynamic operations such as harbor tugs often face significant challenges in power management control to maximize...
Reliability-Security Constrained Unit Commitment (RSCUC) with emphasis on Mixed Integer Nonlinear Programming (MINLP) and Benders Decomposition (BD) based on thermal generating units are presented in this paper. To solve unit commitment problem generalized BD along with reliability issues are considered. The approach presented in this work allows the decomposition of the whole program in quadratic...
Microgrids are characterized as weak systems with poor power quality due to significant variations in frequency and/or voltage that can occur during sudden changes in load demand. This problem is exacerbated in cases where one of the power sources is tied to the microgrid through a grid-interactive inverter which is designed to trip when deviations in frequency and voltage exceed well-defined thresholds...
A Microgrid (MG) has a major role in power system. Because of its numerous benefits, such as its ability to reduce environmental impact and enhance the reliability of a power system. Hence, Multi-MG (MMG) consisted of multiple MGs is being studied intensively. This paper proposes the optimal power exchange of MMG with hierarchical coordination. The whole system architecture consists of two layers:...
Since shipboard power systems are inherently islanded and consist of energy intensive sources and loads, it is an interesting application for dc microgrids. The object of this paper is to explore the merits of dc based shipboard power distribution as compared to conventional ac solutions. A survey of current initiatives, emerging concepts and design challenges is carried out. Based on the review,...
DC distribution systems (DCDS) connect local generators and loads directly. By avoiding unnecessary losses in AC-DC conversion, DCDS offers higher energy efficiency. Since different parties in a DCDS may have conflicting goals, matching between power supply and demand should be done with carefully designed allocation rules and monetary transfers, such that no one prefers to act otherwise than the...
Interruptions in power supply, mainly due to the lack of generation adequacy and the discontinuity of distribution network operation, are significant inconvenience for customers connected to the power network. To quantify the duration of expected outages for customers of Polish power system LOLE and SAIDI indices were applied. The demand response program for customers most exposed to interruptions...
This paper presents an analytical method for flexible resource adequacy assessment of power system with a high share of renewables. The proposed flexible resource adequacy assessment method can assess an annual flexible capacity requirement based on the duration curve models of net-load fluctuations regarding operational reserve requirements. The duration curve models can represent the occurrence...
In countries with Capacity Mechanisms in place, where Explicit Interconnector Participation model is to be used, one of the key market design questions to be answered is how the amount of interconnector capacity that is allowed to participate in the auctions should be determined. This paper argues for an interconnector capacity de-rating approach. In order for the de-rating factor to be representative...
This paper discusses GRIDCo's generator connection procedures and requirements. It provides adequate guidance to the prospective generator connection applicant proposing to connect its generator to the National Interconnected Transmission System (NITS) and allay uncertainties in the connection process. Typical means of connecting generating facilities to the NITS have been illustrated. Identification...
An investigation on the reasons for failure of the own needs supply in one of the blocks of a big electrical power plant in Bulgaria has been presented. The investigation presented is based on a computer model, which adequacy is experimentally verified. The computational investigations with the model show that the reliability of the own needs supply depends on the excitation regime of the generators.
We study the problem of optimum placement of sectionalizing switches in radial distribution networks to minimize the average undelivered energy due to power outages. We show that existing algorithms do not guarantee finding the optimum solution. We present a fast tree structure based method for the computation of the average undelivered energy and an efficient algorithm to find the optimum allocation...
In this paper, a new analytical method and a corresponding two-step procedure are proposed for a wind power generation system design. This comprehensive new method can achieve the wind energy potential evaluation, reliability and costs assessment. In Step 1, the wind energy potential is investigated through the Weibull two-parameter model using the hourly wind speed data of a site. The graphic method...
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