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The paper proposes a hybrid methodology based on a Gaussian local search and a genetic algorithms to address the multi-objective and multistage optimal distribution expansion planning problem. The methodology is applied to solve the problem of optimal network investment under the new possibilities enabled by the smart grid, namely the new observability and controllability investments that will be...
The renewable sources' influence regarding the distribution network expansion planning is tackled. Two cases are involved into discussion: with and without renewable sources. The obtained expansion solutions are analyzed for each case and a final one is proposed. Thus, network reconfiguration is used and technical losses minimization. The power flow is computed using conventional methods, but the...
This paper discusses the problems of design and implementation of complex set of interconnected online and offline planning, optimization and monitoring tools of Swiss Transmission System Operator Swissgrid. After analyzing the requirements and challenges of the system, the paper presents its realization concept, as well as implementation results and the future plans. Solution under discussion widely...
By influencing the demand side by means of price signals (Demand Response) additional flexibility potential in electric supply systems can be provided. However, by influencing the demand side typical consumption patterns of previously unaffected consumers are changed. This will lead to increasing uncertainty in load forecasting. This paper deals with the forecast of load time series in consideration...
This paper tackles the problem of designing planning rules for the integration of renewable energy sources into distribution networks. A novel method is proposed for the assessment and optimization of such planning rules over multi-year horizons. Especially, this method considers: 1) a random generator of multi-year scenarios, which allows taking uncertainties into account, and 2) a simulator of investment...
The energy transition will bring large changes to residential load profiles. In order to assess whether the current low voltage (LV)-grids are capable of handling these changes, future scenario analysis must be used to assess the grid adequacy. To this end, an approach is proposed, incorporating scenario-based household load modelling, LV-feeder clustering and probabilistic load flow calculations...
Many Demand Side Management (DSM) approaches use energy prices as steering signals. This paper shows that such steering signals may result in power quality problems and high losses. As an alternative, this paper proposes to use desired (e.g., flat) power profiles as steering signals and presents an efficient scheduling algorithm that can follow desired power profiles. This paper investigates the complexity...
The current growth of smart grid capable appliances motivates the development of general and flexible software systems to support these devices. The FlexiblePower Application Infrastructure (FPAI) is such a system, which classifies devices by their type of flexibility. Subsequently, energy applications only have to support these flexibility classes. In this work, we present an implementation of the...
Transmission system planning aims to determine a resilient and cost effective expansion plan. But finding an optimal plan is a tough combinatorial challenge in large networks. In this paper, an Automated Network Planning Process (ANEPP) is introduced. Two different heuristic approaches to select additional network branches are implemented in the ANEPP: The Local Search (LS) and the Particle Swarm...
Evaluating the performance of various power system reliability criteria and their management is important in order to obtain a cost effective reliability level of the power system. However, the performance of reliability criteria depends on several parameters, of which one is value of lost load (VoLL). Value of lost load is typically difficult and complex to model, which hampers making a general conclusion...
This paper presents an analysis tool which aims to identify the constraints in a distribution network subject to aging and appearance of distributed generation and electrical vehicles. In order to regulate the network, the use of new functionalities from Smart Grids is proposed as an alternative to the conventional structural solutions like reinforcement. Different operational strategies - load shedding,...
The evolution of distribution systems (DS) towards the smart-grid concept posses new challenges, triggered by the integration of distributed generation (DG) and the installation of new devices. These challenges raise the need to reconsider the traditional network operation during the planning stage, enabling the DS to be flexible to operate under different network configuration scenarios. In this...
Volt/VAR Optimization (VVO) function is an important element in real time operation of distribution networks and major part of advanced Distribution Management Systems (DMS). From planning prospective, VVO function can be used to optimize reactive power flow in distribution network to recommend the best operating condition for the control equipment in a predefined period of time in future (i.e. 24...
Due to high renewable energy share in the distribution networks, reverse power flows can be observed, leading to challenges for the distribution network operators (DNOs). In case of high photovoltaic (PV) penetration in low voltage (LV) level, the LV networks are susceptible to voltage violations and overloading problems, especially at peak feed-in hours. This raises the necessity to undertake reinforcement...
During the recent years, power industries have been facing significant changes due to deregulation and liberalization of the energy markets and increase of the installed capacity of renewable energy sources. These factors directly affect the transmission network planning (TNP) task and inspire a search for new, more adequate methods. This paper compares a deterministic method — the economic intervals...
Using one circuit of multi-circuit AC overhead lines for HVDC transmission has been proposed to increase the transmission capacity, to minimize system stability problems, and to avoid opening new transmission corridors. This paper presents a formulation to determine the optimal location and power rating of HVDC converters to convert one circuit of a multi-circuit AC line to DC. These configurations,...
The paper presents a comparison of four widely used reliability importance measures in order to identify their appropriateness for the identification of the most critical system components for replacement planning; specifically when using Non-sequential Monte Carlo method. These importance measures are Improvement Potential, Structural Importance, Criticality Importance, and Fussell-Vesely Importance...
This paper addresses a technical and economic study of the opportunities provided by the storage facilities in LV networks planning. Without having to reinforce the existing network, three economic models of storage are studied in order to assess the possible increase in renewable integration. The simulations are conducted on a test network derived from a real LV distribution network. It is a three-phase...
Global optimal solution to microgrid operational planning problem can be obtained by using a Modified Optimal Dispatch Strategy (MODS) which combines Load Following Dispatch Strategy (LFDS) and Cycle Charging Dispatch Strategy (CCDS). Most of the dispatching strategies formulated in microgrid operational planning problem may lead to solutions which are not necessarily global optimal. In this work,...
This paper describes a hybrid tool to perform Static Transmission Expansion Planning, STEP, studies and its application to the Garver6-Bus academic system and to the Southern Brazilian Transmission equivalent real system. The developed STEP tool integrates two phases as follows. The first one uses Constructive Heuristic Algorithms (CHA) to reduce the search space, and the second uses Particle Swarm...
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