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Session
Session 11: RES Integration
Time: Thursday, 26/May/2011: 11:30am - 1:00pm
Session Chair: Efraim Centeno
Location: Venice

Presentations

Environmental Dispatch of the Portuguese Power System for CO2 Emissions Reduction

Sérgio Faias1, Jorge de Sousa1, Rui Castro2

1Lisbon Engineering Superior Institute, ISEL, Portugal; 2Technical University of Lisbon, IST/UTL, Portugal

The present paper uses the concept of the environmental dispatch minimizing the CO2 emissions associated with the thermal generation of a power system. The environmental dispatch is applied to the Portuguese system and the respective results are compared to the results of a classical economic dispatch.

The environmental and economic dispatch results comparison assumes the reference emissions allowances price of 20 euro/ton CO2. However, in order to understand the influence of the CO2 emissions allowances prices on the economic dispatch results, a sensitivity analysis was performed, considering different emissions allowances prices.


Scenario Analysis for RES-E Integration in Italy up to 2050

Fabio Lanati, Alberto Gelmini

RSE S.p.A (Ricerca sul Sistema Energetico), Italy

The paper aims at analyzing four possible development scenarios of the Italian power system up to 2050 using the multi-regional model MATISSE (TIMES based). This study has been realized for the WP2 of the European project SUSPLAN that aims to develop strategies, recommendations and benchmarks for the integration of renewable energy sources (RES) in the European context on a time horizon stretching to 2050. The results of the study show, for each scenario, the different RES-E development, the fossil fuel dependency and CO2 emissions in the Italian power system. MATISSE may also “invest” in the development of the Italian electric grid, if considered cost-effective. Therefore the paper also shows how the spread of RES-E will affect the development of the electric grid in Italy.


A Scenario Analysis for an Optimal RES Integration into the European Transmission Grid up to 2050

Alessandro Zani, Andrea Grassi, Gianluigi Migliavacca

RSE Spa, Italy

This paper describes the results of a study, carried out in the framework of the EU research project SUSPLAN and aimed at assessing how the EU Electricity Transmission Network should be upgraded so as to allow integrating the maximum share of renewable energy sources (RES) in Europe within the timeframe 2030-2050. The investigation, carried out by developing and running a model of the whole European power system, is focused on assessing optimal electricity transmission network expansions of the trans-national corridors between the European countries, so as to ensure security of electricity supply while keeping into account the impact on electricity production costs and CO2 emissions.

In particular, we compared the outcome of the four benchmark scenarios of the SUSPLAN1 project.

These scenarios are differentiated on the basis of two drivers: public acceptance and technological development. The reference years considered in the study are 2030, 2040 and 2050.

In the following, the methodology, the assumptions and the results of the study will be reported.


Negotiated Predictive Dispatch: Receding Horizon Nodal Electricity Pricing for Wind Integration

Joseph Warrington, Sébastien Mariéthoz, Manfred Morari

ETH Zurich, Switzerland

Rapid wind fluctuations make the systematic operation of electricity markets with high wind power penetration difficult. A novel dynamic pricing mechanism is presented, which uses a receding horizon principle to allow forecasts of wind power and demand to be incorporated as soon as they are available, and is shown to be capable of reducing dispatch costs on the hours timescale in volatile wind conditions. Incorporating a time horizon is shown to allow market participants to plan generator ramping decisions and storage operation better than when prices are set in a decoupled manner for sequential time steps. The scheme repeatedly updates proposed prices based on the degree to which the corresponding power outputs planned by the market participants violate constraints on the transmission network. The scheme's operating rules, based on the theory of Lagrangian relaxation, are presented algorithmically. Results are demonstrated on a 39 bus network modified to include a large quantity of wind power, as well as conventional generators, loads, and storage.


Large Scale Integration of Renewable Energy Sources in the Spanish Power System. Curtailment and Market Issues

Javier Revuelta, José Carlos Fernandez, José Luis Fernandez

Red Electrica de España, Spain

In Spain, Renewable Energy Sources (RES) have priority of dispatch in the process of scheduling the available power plants to satisfy system load requirements. Nevertheless, some non-RES units must be necessarily dispatched due to security or system constraints. Thus, at any given time, maximum RES production that can be fed into the system is limited. When RES available resource is higher than this limit, curtailments must be applied in order to guarantee system security. Such situations have already occurred in Spain on several occasions of high wind production during off-peak demands.

This paper presents an estimation of future RES curtailments in the Spanish power system. The time horizons of the study are years 2016 and 2020. National RES installation objectives for those years are taken into account. Results show that under all the scenarios considered, RES curtailments are expected to occur. Then, the paper discusses different technical and regulatory measures that could be put in place in the Spanish power system with the aim of optimizing the integration of renewable resources.


Challenges of Optimizing the Integration of Distributed Generation into the Distribution Network

Marina Cavlovic

HEP ODS d.o.o.

Encouraged by the global strategy of promoting distributed generation (hereinafter: DG), unregulated integration of DG into the distribution network created a number of problems in the distribution network. The article elaborates new conditions in the network as a consequence of DG integration and highlights the problems caused by DG. The purpose of the article is to examine the possibilities of regulating the optimal integration of distributed generation in distribution network without the smart grid. The concept for the prevention of negative consequences of DG integration is proposed. The article indicates that, if properly managed and coordinated, DG integration can reach the sustainable level of acceptance in the distribution network, without the risk of endangering the integrity of the distribution network. The proposed solution is based on the systematic multidisciplinary approach to the integration of DG into the distribution network. Precondition is the cooperation between responsible energy entities: the electricity producer and the distribution system operator (hereinafter: DSO), supervised by the independent national regulatory authority. The goal is to organize a regulated DG integration that will provide a positive DG contribution to the distribution network and to DG itself.