Utilization of Active Distribution Network Elements for Optimization of a Distribution Network Operation (original) (raw)
Related papers
EPJ Web of Conferences, 2014
The diffusion of Distributed Generation (DG) based on Renewable Energy Sources (RES) requires new strategies to ensure reliable and economic operation of the distribution networks and to support the diffusion of DG itself. An advanced algorithm (DISCoVER-DIStribution Company VoltagE Regulator) is being developed to optimize the operation of active network by means of an advanced voltage control based on several regulations. Starting from forecasted load and generation, real on-field measurements, technical constraints and costs for each resource, the algorithm generates for each time period a set of commands for controllable resources that guarantees achievement of technical goals minimizing the overall cost. Before integrating the controller into the telecontrol system of the real networks, and in order to validate the proper behaviour of the algorithm and to identify possible critical conditions, a complete simulation phase has started. The first step is concerning the definition of a wide range of "case studies", that are the combination of network topology, technical constraints and targets, load and generation profiles and "costs" of resources that define a valid context to test the algorithm, with particular focus on battery and RES management. First results achieved from simulation activity on test networks (based on real MV grids) and actual battery characteristics are given, together with prospective performance on real case applications.
This paper proposes the online reconfiguration of active distribution networks. The control of the active/reactive output power of distributed generation (DG) units combined with the control of remote controlled switches are employed in order to minimize DG curtailment, alleviate lines congestion, and mitigate voltage rise issues due to DG integration. Convex relaxations of the ac power flow equations and mixed integer linear disjunctive formulations are adopted to the optimization model in order to obtain fast and optimal solutions using standard branch and bound solvers. The computation burden of the optimization procedure is drastically reduced by exploiting the assessment of switching actions, which is performed using multiple load/generation scenarios. The effectiveness of the proposed optimization model is verified using different distribution test systems.
2011
In an European perspective, the focus of Smart Grids initiatives (SET Plan - Strategic Energy Technology Plan) is strictly linked with the main commitment to achieve the goals of the Climate and Energy Package 20-20-20, at the light of the three main pillars of the European energy policy: competitiveness, sustainability and security of supply. Smart grid technologies will enable load levelling of the electrical grid, allowing a power company to run cleaner power sources - such as hydroelectric, wind, or solar - while reducing the need to use carbon-emitting gas, coal, or oil plants to meet peak demand. In this framework the proposed paper refers about the technical economical feasibility study and the preliminary design of a demonstrator of a distribution electrical system for the transition towards active networks. The study has been carried out by University of Palermo and ENEA (Italy), on a portion of real MV/LV distribution system of the research center ENEA of Casaccia (Rome, Italy).
Active distribution network concept for distributed management of low voltage network
IEEE PES ISGT Europe 2013, 2013
Two challenges need to be addressed in designing active network management (ANM) for distribution networks that use non-firm connection agreements for quicker and cheaper connections of distributed energy resource (DER). First is the replacement of scripted actions based on priority lists by real-time selection of actions offered as ancillary services and judged on efficacy and cost. Second is the need to decentralize or distribute ANM decision making to avoid unrealistic communication and computation burdens as the number of controllable devices increases. This paper proposes a distributed form of ANM for radial networks, based on local estimation of the voltage sensitivities to offered adjustments of real or reactive power and then uses message passing between local controllers to arrive at near-optimum choices of actions. To manage a voltage constraint, the minimum volume (or cost) of ancillary services is found by selecting services from DERs with highest voltage sensitivity to the service offered. A method of sensitivity estimation for individual nodes is extended to all terms of the inverted Jacobian matrix. The accuracy of this approximation is discussed and explored in a case-study network. The format of message passing from one local controller to another is described. Simulations demonstrate that the proposed distributed ANM closely approaches the solution found by a centralized optimal power flow. It is confirmed that the use of locally estimated voltage sensitivity to identify the most effective DER can minimize the volume of power flow adjustment service that the ANM needs to manage voltage and thermal constraints. INDEX TERMS Active network management, distributed energy resources, distributed optimization, renewable energy integration.
Voltage Control Methodologies in Active Distribution Networks
Energies
Renewable Energy Sources are becoming widely spread, as they are sustainable and low-carbon emission. They are mostly penetrating the MV Distribution Networks as Distributed Generators, which has determined the evolution of the networks’ control and supervision systems, from almost a complete lack to becoming fully centralized. This paper proposes innovative voltage control architectures for the distribution networks, tailored for different development levels of the control and supervision systems encountered in real life: a Coordinated Control for networks with basic development, and an optimization-based Centralized Control for networks with fully articulated systems. The Centralized Control fits the requirements of the network: the challenging harmonization of the generator’s capability curves with the regulatory framework, and modelling of the discrete control of the On-Load Tap Changer transformer. A realistic network is used for tests and comparisons with the Local Strategy cu...
Real experience with active DER in distribution networks
IET Conference Publications, 2009
The EU Commission in the target of promoting distributed energy resources (DER) into existent networks approved FENIX 1. One of the main outcomes of the project has been an architecture based on the Virtual Power Plant (VPP) concept, which allows increasing the DER penetration massively while optimizing the power system. The project considers two physical demonstrations. This paper describes one of them located in the North of Spain. A group of units of different technologies is used actively in a distribution network (30 and 13kV in Alava province) operated by Iberdrola Distribution. DERs aggregated provide various ancillary services as tertiary active reserve and voltage control to both DSO (Iberdrola) and TSO (Red Eléctrica Española-REE)). This paper covers not only the technical description of the Spanish demonstration but also a brief economical analysis of it. The cost-benefit study includes the comparison between the active participation of DER and the current passive situation in terms of: losses, quality of service, electricity price, and displacement of CO 2 emissions from conventional generation. Overall it outlines the economical advantage of active DER under the correct degree of penetration.
2011
In an European perspective, the focus of Smart Grids initiatives (SET Plan -Strategic Energy Technology Plan) is strictly linked with the main commitment to achieve the goals of the Climate and Energy Package 20-20-20, at the light of the three main pillars of the European energy policy: competitiveness, sustainability and security of supply. Smart grid technologies will enable load levelling of the electrical grid, allowing a power company to run cleaner power sources -such as hydroelectric, wind, or solar -while reducing the need to use carbon-emitting gas, coal, or oil plants to meet peak demand. In this framework the proposed paper refers about the technical economical feasibility study and the preliminary design of a demonstrator of a distribution electrical system for the transition towards active networks. The study has been carried out by University of Palermo and ENEA (Italy), on a portion of real MV/LV distribution system of the research center ENEA of Casaccia (Rome, Italy). 1