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This paper presents a methodology to include battery life regulation in real-time power management of grid-tied microgrids. For this purpose, first a framework for estimating battery life in the presence of partial charge/discharge cycles is developed. Based on the developed life estimation technique, two alternative methods for battery life oriented power management in microgrids are proposed. Both...
Home Automation systems represent one of the most promising technologies for energy efficiency, which is currently considered one of main factors enabling an environmental sustainable growth. However, several barriers hinder a massive diffusion of Home Automation systems and their economic viability. The paper aims to analyze the economic viability of the adoption of a Home Automation system in different...
An assessment of the dynamic interactions between generators will provide valuable information which could improve control action and hence maintain stability in the interconnected system. The paper presents the study on dynamic interaction in terms of coherency established among the generators following a particular event. Time Frequency Coherency (TFC) method is applied to trace the coherency among...
The paper proposes an approximated yet reliable formula to estimate the frequency at the buses of a transmission system. Such a formula is based on the solution of a steady-state boundary value problem where boundary conditions are given by synchronous machine rotor speeds and is intended for applications in transient stability analysis. The hypotheses and assumptions to define bus frequencies are...
This paper presents the development of a new methodology for the simulation of Power Line Communication (PLC) within the popular Electromagnetic Transients Programme-Alternative Transients Programme (EMTP-ATP). As a first application, the comparative performance of the emerging Orthogonal Frequency Division Multiplexing (OFDM) based Prime and G3-PLC narrowband standards is investigated. Models of...
In this paper we investigate the impact of zonal network management in the operation of power systems with significant levels of renewable energy integration. Our study is inspired by the current state of the European energy market, and we focus on a case study of the Central Western European (CWE) system. First, we present a hierarchy of models that account for unit commitment, the separation of...
This paper presents a method for voltage stability monitoring based on the maximum power transfer to the load. The only required information is the system topology, the data from PMUs and the operational status of synchronous generators. With this information, the Thevenin impedance seen from a load bus can be estimated and by using the Thevenin theorem for maximum power transfer an impedance based...
High penetrations of distributed generation in distribution grids may cause malfunctioning of conventional protection systems due to bidirectional flows and highly variable short-circuit levels. While there has been extensive research on this topic, developing a reliable cost-efficient protection system for active distribution grids remains a challenging task. This paper presents a new protection...
The visualization of massive amounts of data is a challenge for the evaluation of power quality, where hundreds of data points per second and location can be generated. Based on the theoretic foundations of data visualization, common visualizations for the current state of power quality as well as aggregated values are reviewed and analyzed. For several examples, the mapping from data point properties...
Short-term wind power forecasting is based on modelling the complex relationship between the weather forecasts and wind farm power production. To date, efforts to improve wind power forecasts have focused on improving Numerical Weather Prediction and wind farm power curve models. However, utility-scale wind farms cover large areas meaning that a single power curve model may struggle to represent the...
This paper proposes a new intelligent design method for the collar option of weather derivatives. They play an important role to hedge risks caused by meteorological conditions. The collar option implies the transaction between two companies that take a complementary stance to risks. Such an idea is applicable to power and gas companies. This paper focuses on the equivalence of the payoffs in the...
Extreme weather can lead to serious contingencies in power systems. Risk assessment based on weather forecast is pivotal for emergency response and restoration plan of potential contingencies in power grids. Numerous models and algorithms of electric asset risk prediction have been proposed in the last few decades. This paper reviews various models and discusses the advantages and disadvantages of...
This paper considers a three-phase grid-connected photovoltaic (GCPV) system, which comprises a 120kW PV farm connected to the grid through a step-up transformer. GCPV is considered as a distributed generation (DG) serving a variable local load (LL) connected to the low voltage side of the transformer. A power conditioning unit (PCU) consisting of a two-stage energy conversion device is used to (i)...
With high penetration of distributed generation (DG), the conventional underfrequency load shedding (UFLS) faces many challenges and may not perform as expected. This paper proposes new UFLS schemes, which are designed to overcome the shortcomings of the traditional load-shedding scheme. These schemes utilize directional relays, power flow through feeders, wind, and photovoltaic (PV) measurements...
Many energy systems rely on natural gas to fulfil their energy demand. In particular, natural gas is often used in the heating sectors as well as for electrical generation. In such systems, a comprehensive analysis of the system's resilience must account for the interdependencies between the electricity, heat, and gas sectors. Furthermore, the development of different gas supply sources can impact...
In high voltage transmission lines, the shield wires are often sectionalized for several reasons. This practice may have considerable effects on power line communications in multiconductor transmission lines. A careful simulation is performed in order to put in evidence the relevant channel features.
Electricity grid regulations are frequently revised in order to accommodate the ever-increasing penetration of distributed renewable energy systems (RES). Interconnected RES are required to operate conditionally under normal and abnormal grid conditions. Furthermore, RES are required to have fault ride through (FRT) capability so that they can provide voltage and frequency support to the grid. The...
Evolutions in the power system challenge the manner in which power system reliability is managed. In particular, currently used reliability criteria, typically the deterministic N-1 criterion, are increasingly inadequate. Moving to an alternative approach is difficult as quantifying benefits is hard in a multifaceted environment and system operators are reluctant to move away from the easy and transparent...
To face the massive integration of Distributed Renewable Energy Sources (DRES), Distribution System Operators (DSO) need to evolve, especially in the operational planning of their networks. In this context, this paper presents a formulation for the Active Distribution Network (ADN) operational planning (OP) problem employing a Second Order Cone (SOC) relaxation of the Optimal Power Flow (OPF). For...
Due to significant economies of scale, the capital-intensive involved and government regulations that still don't rule a perfect competition environment, the power generation industry is usually organized as a market with oligopolistic competition. In this type of market structure, participating agents implement different strategies or games to exercise market power in order to increase their profits...
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