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The aim of this paper is to avoid overloading a private customer distribution transformer (DT) in a Portuguese insular area through the means of solar PV microgeneration. Firstly, the consequence of the penetration of electric vehicles (EV) on dielectric oil deterioration of a DT in an industrial unit is estimated. The workplace has local PV generation, allowing the EVs to charge while their owners...
Because of various developments in communications and technologies, each residential consumer has been enabled to contribute in Demand Response Programs (DRPs), manage its electrical usage and reduce its cost by using a Household Energy Management (HEM) system. An operational HEM model is investigated to find the minimum consumer's cost in every DRP and to guarantee the end-user's satisfaction, as...
Since the adoption of plug-in electric vehicles (PEVs) is constantly increasing, in the coming years electrical distribution networks will face the problem of accommodating for massive and unpredictable extra loads with diverse operating patterns. In this paper, we propose a semi-decentralized architecture to control the charging process of a fleet of PEVs. To study the impact on a low voltage (LV)...
The operation of aggregators of distributed energy resources (DER) is a highly complex task that is affected by numerous factors of uncertainty such as renewables injections, load levels and market conditions. However, traditional stochastic programming approaches neglect information around temporal dependency of the uncertain variables due to computational tractability limitations. This paper proposes...
Voltage control zones are commonly used within power systems, for applications like Secondary Voltage Control and localized reactive power markets. The idea is to partition a power system into zones that are weakly coupled in terms of voltage control. Conventionally, these control zones are defined with a deterministic approach and are fixed. However, recent research has demonstrated that they may...
This paper investigates different optimization strategies for frequency-response coupling between synchronous areas that feature decentralized load-frequency control structures. The mathematical basics are presented together with a frequency dynamics system parameterized to match the synchronous areas of Continental Europe, Great Britain, and Northern Europe. Three optimization strategies are evaluated:...
Due to the increasing exchanges of electricity in Europe, advanced Capacity Allocation and Congestion Management (CACM) methods, such as zonal flow-based market coupling (FBMC), have been developed. For instance, the implementation of the FBMC method is accompanied by high computational effort due to the large number of possible Critical-Branch-Critical-Outage (CBCO) combinations, especially in large-scale...
The increased integration of distributed energy resources (DER), based mainly on renewable sources, imposes new challenges on the distribution system operation and planning. The recent developments in energy storage technologies provide opportunities to use them as distributed storage systems. This paper presents a framework to assess the investments in battery energy storage systems (BESS) for distribution...
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...
The characteristics of harmonic current emission of residential customers depends significantly on the number of users. While single users have a virtually random behavior, the low order harmonic current of a whole network with several hundreds of residential users usually shows a high level of prevalence with low variation. This paper discusses the aggregation characteristic of low order harmonic...
To increase the penetration of distributed renewable energy resources (DRES) in the existing LV network, new control solutions need to be developed. In this paper an algorithm for overvoltage mitigation in LV networks with DRES is proposed. Complex communication infrastructure for monitoring and controlling an extensive part of the LV network is not economically attractive for distribution system...
In the activation market, the Transmission System Operator selects and activates balancing energy bids to cover the system imbalance. Growing use of intermittent energy sources increases uncertainty in system operation and new EU regulations, including a so-called Activation Optimization Function and new Standard Products for manual frequency restoration reserves (mFRR), will change the activation...
To deal with challenges introduced by the adaption of distributed energy resources, Demand Side Management methodologies are being developed to ensure the availability and reliability of our electricity supply in the future. The Power-Matcher and TRIANA are two examples of such management methodologies. As the strengths of the approaches complement each other, the two approaches are combined in this...
In this paper, we introduce a new concept for improving numerical simulation performances for electromagnetic transients. Several methods already exist but take the sinusoidal structure of simulated signals into account in the modeling, and thus modify the original equations system. Our method improves variable time step prediction-correction schemes by taking the oscillating characteristics of the...
This article elaborates on a recently published issue that calls the entire PV community's and utility management attention. It specifically provides further analysis on DC leakage and fault detection blind spots associated with the operation of floating PV Systems. Floating systems are almost a standard practice in Europe when it comes to the operation of large-scale PV parks. A floating PV system...
The grid is hierarchical in three parts whose functions are quite different. First, the transmission system's role is to transport energy into high voltage from production centers to consumption areas and distribution network directly supplies large industrial consumers and supplying the average and low voltage consumers, with the latest advances in industry and Technological the need for electricity...
This paper investigates the effect of Wind Farm (WF) active power variability on an emergency maximum reactive support control scheme. The latter is proposed as a means to increase the maximum power transfer, and thus the voltage stability limit of a weak transmission corridor. Substation and WF feeder controls (including switched capacitors and load tap changers), as well as converter current and...
This paper presents novel approach for optimal distribution network reconfiguration using the combination of cycle-break algorithm and genetic algorithms. Significant improvements are introduced in the phases of initial population generation as well as other general operations inside genetic algorithm. These improvements lead to better convergence rate and computational time reduction. Even though...
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