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We study the profitable amount of additional storages in the German electricity network. The more storages there are the less profitable they become. To account for this effect, we construct a price model based on German data from 2015. This price model is based on the merit order theory and the explanatory variables are conventional generation and export. Then we build a cost model for different...
The increasing integration of Electric vehicles (EVs) and renewable generators (RGs) is an inevitable trend in power system development to control the release of greenhouse gases and pollution and reduce dependence on fossil fuels. This will challenge distribution networks, which have constrained capacities, due to the intrinsic intermittence of renewable power and additional charging load demand...
This work presents a layout design method for a grid-connected PV-Battery-Diesel microgrid considering the effect of the applied power management strategy among the system's components. The proposed microgrid is dedicated to those areas in the world which suffer from prolonged grid outages and depend mainly on diesel generators to cover the periods of power deficit. Conventionally, such hybrid microgrids...
The application of semidefinite programming (SDP) to the resolution of the Optimal Power Flow problem (OPF) has recently been the focus of significant research effort. In conjunction with sparsity-exploiting techniques, it can yield globally optimal solutions for well-conditioned large-scale networks. In this paper, we show that these techniques can theoretically be extended to a larger class of problems,...
This paper presents results of a heuristic optimization method for parameterization of decentral reactive power control, which can be used to improve static voltage quality in distribution grids. With an optimized Q(V)-curve it is possible to significantly reduce the additional reactive energy and accomplish lower losses in the grid while keeping the voltage within the specified limits. In this paper...
A comparison of two energy management systems for an isolated microgrid based on photovoltaic generation is presented in this paper. One energy management system is presented as an optimization problem solved by means of a mixed integer linear programming which aims to minimize the operating cost of the microgrid. The algorithm determines the optimal power dispatch of all distributed generation units...
Importance of research on specific aspects of ultrashort pulse propagation and voltage peak values localization along printed circuit board (PCB) multiconductor bus is highlighted. Simulation of a trapezoidal ultrashort pulse propagating along conductors of the bus with a different number of excited conductors, fixed variation of the whole ultrashort pulse duration (3; 0.3; 0.03 ns) and a duration...
The Brazilian power system is a hydrothermal system mainly composed of hydroelectric generation. In order to deal with the uncertainties related to future water inflows a hydroelectric power plant receives an assured energy certificate. In general, those assured energy certificates correspond to energy that each plant can produce considering a 5% risk of energy not supplied. Also, they represent the...
This paper describes the use of a cost-minimisation algorithm to explore the potential impact of two options for financial support for low carbon generation in the form of contracts for difference in a system with locational marginal pricing: 1. with a system-wide strike price; 2. with locational strike prices. A two zone system is modelled with the additional financial support for low carbon generation...
The described work analyses the issue related to the application of a nodal pricing methodology to the Italian power system. If on one side the nodal pricing methodology has proven to be the best possible solution for electric energy, on the other side the application to the Italian power system introduces some problems. This paper presents the peculiarity of application to the Italian real time balancing...
The effects of the spatial scale on the results of the optimisation of transmission and generation capacity in Europe are quantified under a 95% CO2 reduction compared to 1990 levels, interpolating between one-node-per-country solutions and many-nodes-per-country. The trade-offs that come with higher spatial detail between better exposure of transmission bottlenecks, exploitation of sites with good...
This paper presents a new locational allocation method for automatic reserves that accounts for both the transmission network security and balancing power aspects using a security-constrained multi-period AC optimal power flow formulation and co-optimization of reserves. The proposed method's novelty includes going beyond linear DC-based dispatch security models with fixed reserve requirements, employing...
In this paper, the major methodologies proposed in the last years to speed-up the synthesis of radio-frequency integrated circuits blocks are overviewed. The challenges to automate this task are discussed, and, to avoid non-systematic iterations between circuit and layout design steps, the architecture of an innovative solution is proposed. The proposed tool exploits the full capabilities of most...
Recent studies have shown that multi-step optimization based on Model Predictive Control (MPC) can effectively coordinate the increasing number of distributed renewable energy and storage resources in the power system. However, the computation complexity of MPC is usually high which limits its use in practice. To improve the efficiency of MPC, in this paper, we apply a distributed optimization method...
The AC optimal power flow problem is a non-convex optimization problem that is difficult to solve quickly and reliably for large-scale grids. To enable the application of efficient and robust solution algorithms, various linear approximations of the nonlinear system model are used. However, this may lead to solutions that are AC suboptimal or even infeasible. This paper proposes new linearization...
Optimal power flow (OPF) and security-constrained OPF (SCOPF) studies are important tools for both planning and operation of power supply systems. Conventional gradient-based SCOPF methods are commonly used for that purpose, but when analysed system is overstressed with severe multiple contingencies, conventional SCOPF methods may fail to converge. In such cases, meta-heuristic SCOPF methods can be...
In this paper, we evaluate a multi-objective-moving-horizon-optimization (MO-MHO) approach as an instrument for improvement of economic dispatch in microgrids. In particular, we investigate the effect of adaptation of the multi-objective optimization strategy used in the moving horizon framework on the end result of the economic dispatch. Power dispatch in microgrids is inherently a high-dimensional...
Electric power systems with high penetrations of fluctuating renewable generation may operate close to their stability limits. Demand response can be used to improve power system stability. For example, it is already used to provide frequency control, improving frequency stability. This paper presents a new demand response strategy that uses fast-acting flexible loads to change the loading pattern...
Current models of capacity market designs in the U.S. and elsewhere ignore the important issue of carbon emission produced by power generators. While the current designs may produce optimal and efficient capacity market prices, these designs contribute little or nothing to reduce such emission. In this paper, we present a novel alternative to the current capacity market design which can realistically...
Distributed energy resources are shaping the future of power systems. Coordination of these geographically scattered resources motivates the need for adoption of distributed control strategies. This paper presents a fully distributed DC Corrective Security Constrained Optimal Power Flow (CSCOPF) for electricity networks in which the transmission lines are potentially instrumented with Distributed...
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