Authors

Publications

Centrali ibride, tecniche di controllo per la gestione di micro reti intelligenti20130401095242

Centrali ibride, tecniche di controllo per la gestione di micro reti intelligenti

1 April 2013
L. Frosio, C. Rosati, G. Marchegiani, I. MazzuccoAutomazione e Strumentazione, 84-88.pdf // April 2013Le centrali ibride, elemento chiave per poter realizzare e controllare le microreti ad alta penetrazione di Fonti Energetiche Rinnovabili, richiedono tecniche di controllo specifiche. In questo articolo si presenta una panoramica sulle varie modalità di controllo degli inverter di interfaccia delle centrali ibride e sulle diverse architetture di microrete che si possono realizzare. Si presentano inoltre alcuni risultati sperimentali ottenuti su una microrete a potenza ridotta sulla quale sono...
Parallel-connected photovoltaic inverters: Zero frequency sequence harmonic analysis and solution20130530095054

Parallel-connected photovoltaic inverters: Zero frequency sequence harmonic analysis and solution

30 May 2013
M. S. Carmeli, M. Mauri, L. Frosio, A. Bezzolato, G. MarchegianiInternational Journal of Emerging Electric Power Systems, vol. 14, no. 2, pp. 199-2016 // 30 May 2013High-power photovoltaic (PV) plants are usually constituted of the connection of different PV subfields, each of them with its interface transformer. Different solutions have been studied to improve the efficiency of the whole generation system. In particular, transformerless configurations are the more attractive one from efficiency and costs point of view. This paper focuses on transformerless PV configurations characterised by t...
Gas bills are falling – thanks to who?20130601093639

Gas bills are falling – thanks to who?

1 June 2013
Giuseppe Artizzuwww.huffingtonpost.it // june 2013“In a scenario of strong contraction of the demand for energy, the new system of balancing introduced by the authorities in December 2011 has contributed -along with other regulatory interventions and recent European rules on transport capacity allocation and congestion management- to lowering the spread in the rest of Europe”. The spread which the energy authority has spoken about is the one that reflects the difference between the price of gas in Italy and across the borders. In recent months the differential has fallen dramatically, unti...
Reduction method for active distribution networks20130620094154

Reduction method for active distribution networks

20 June 2013
P. Raboni and Z. Chen2013 IEEE Grenoble, 2013, pp. 1-6 // 20 June 2013On-line security assessment is traditionally performed by Transmission System Operators at the transmission level, ignoring the effective response of distributed generators and small loads. On the other hand the required computation time and amount of real time data for including Distribution Networks also would be too large. In this paper an adaptive aggregation method for subsystems with power electronic interfaced generators and voltage dependant loads is proposed. With this tool may be relatively easier including distrib...
Commercial bills are cut with the carbon tax20130801093457

Commercial bills are cut with the carbon tax

1 August 2013
Giuseppe Artizzuwww.huffingtonpost.it // august 2013In 2012 the electric bills have been loaded wth 10 and a half billion euros of incentives for renewable energy sources. Who benefits is who works in the green industry, at least indirectly. I do not intend to defend the reasons for incentives, nor stigmatize mistakes. I will look at the facts: the average charge in a bill is over 4 cents per kilowatt hour. Aside from second homes and families with high consumption, users most affected are small and medium-sized enterprises. On the other hand there are a number of exempted consumers like those...
Dispersed generation to provide ancillary services: AlpStore project20130829093231

Dispersed generation to provide ancillary services: AlpStore project

29 August 2013
M. Delfanti, L. Frosio, M. Merlo, G. Monfredini, L. Pandolfi, C. Rosati, D. Rosati,International Conference on Clean Electrical Power (ICCEP), pp. 133-138 // 29 August 2013In the future, electrical systems should be able to integrate all users at the same time and guarantee power quality, stability and safety over time. The integration of renewable energy sources leads to new issues involving the intermittence of this generation typology. A high penetration of intermittent power plants will reduce the capability of the system to overcome critical events (e.g. frequency oscillations and voltage...
A novel mechanical hardware in the loop platform for distributed generation systems20130924092917

A novel mechanical hardware in the loop platform for distributed generation systems

24 September 2013
M. S. Carmeli, F. Castelli-Dezza, M. Mauri, G. MarchegianiDistributed Generation and Alternative Energy Journal, vol. 28, no. 3, pp. 7-27 // 24 September 2013The growing number of distributed generation (DG) plants has emphasized the need to perform tests before the plants begin to operate. DG systems are complex enough that setting up of an experimental phase requires high costs and efforts. Moreover, renewable energy sources are intrinsically intermittent as they vary randomly with the time of day, the season and the weather. Consequently, the possibility of emulating the behavior of the who...
An OFF-GRID Base Station Powered By Sun Wind, and Water20131013092559

An OFF-GRID Base Station Powered By Sun Wind, and Water

13 October 2013
S. Bian, X. Wang, M. CongiatuIntelec 2013, Hamburg, Germany // 13 - 17 October 2013With the fast deployment of mobile network the energy consumption is increasing at the same time. The Radio Access Network may occupy more than 60% total energy consumption of a mobile operator. How to improve the energy efficiency of the Base Stations is vital important. The renewable energy is now widely used to power the Base Stations and usually the Lead Acid Batteries are used to be the energy storage. In this paper a new hybrid pure renewable energy system for BTS is introduced. The Site is powered only by...
Modeling and control of low voltage flexible units for enhanced operation of distribution feeders20131113092339

Modeling and control of low voltage flexible units for enhanced operation of distribution feeders

13 November 2013
P. Raboni, H. Weihao, S. K. Chaudhary, and Z. ChenIECON 2013 - 39th Annual Conference of the IEEE, 2013, pp. 7469-7474 // 13 November 2013In some networks Distributed Generators (DGs) are phasing out conventional power plants in terms of power production but still large efforts are required for providing ancillary services. In this paper the usage of fast response units like a Micro Turbines (MT) and a stationary Electric Vehicle Battery (EVB) is proposed for providing primary regulation in grid connected mode and for hierarchically manage an islanded LV distribution feeder. The unit models ar...
The american energy model is not a model20140101092148

The american energy model is not a model

1 January 2014
Giuseppe Artizzuwww.huffingtonpost.it // january 2014Americans are paying a third of the cost of gas in Europe, and half of that of electricity. The America of Bush and Obama is an enlightened energy model, to be imported to this side of the Atlantic. The numbers are not far from reality, but this conclusion is somewhat hasty. That Scaroni and his colleagues pester the European press with slogans is understandable, however the Ministers of Industry being their sounding board is not. This is a brief recent American history, : in the past decade the soaring prices of oil and gas has made it for ...
Electricity market. Is the design really obsolete?20140201091358

Electricity market. Is the design really obsolete?

1 February 2014
Giuseppe Artizzuwww.qualenergia.it // february 2014In the Italian electricity system outlined there is the hypothesis that the closure of part of the thermoelectric capacity would compromise system security. It would be better to leave the reserve margin to drop and see if commodity prices return to levels compatible with ensuring the system. An article by Giuseppe Artizzu. Until three years ago, the time profile of the equilibrium price in the market followed the electric load curve faithfully. By 2012 the photovoltaics had brought a gradual but systematic reduction of price in the central ho...
The big bluff of oil companies20140201091950

The big bluff of oil companies

1 February 2014
Giuseppe Artizzuwww.huffingtonpost.it // february 2014The Eni media campaign focuses on the emergency of a competitive European industry, penalized by gas and electricity which is much more expensive than in the United States. The problem is real, but there are also real doubts about the sustainability of a model founded on cheap hydrocarbons. Besides this, what is striking is the unscrupulousness with which Eni, alone among the big oil companies, has chosen to play a controversial match. The leaders of the company have taken a position contrary to community strategies of decarbonisation, clai...
How to put an end to dependence on russian gas20140501102302

How to put an end to dependence on russian gas

1 May 2014
Giuseppe Artizzuwww.huffingtonpost.it // may 2014A couple of weeks ago it was suggested, provocatively but not too much so that the Russian gas taps should be closed to buyers. Provocation or not, the developments of recent days demonstrate that the energy dependence has a political cost which is too high. Now let’s spare ourselves yet another sterile call for a diversification of sources: we need a plan and its concrete and immediate implementation. Who says it takes decades does not know the market or has a conflict of interests. Exiting from this dependance doesn’t mean stopping the imp...
Harmonic Analysis of Output Filters for Grid Connected Converters in Battery Energy Storage Systems20140525102059

Harmonic Analysis of Output Filters for Grid Connected Converters in Battery Energy Storage Systems

25 May 2014
Alberto Dolara, Giulia Magistrati, Riccardo Zich, Luisa Frosio and Gabriele Marchegiani16th International Conference on Harmonics and Quality of Power (ICHQP) // 25-28 May 2014Battery Energy Storage Systems, as well as many distributed generation systems, use voltage source inverter as interface with the grid. These converters require a filtering section to reduce current harmonics injected to the grid. Usually, harmonic filter is a series inductance connected between grid and inverter. Higher order filters can provide better harmonic attenuation at lower switching frequency and reduce filter ...
Why solar energy has systemic relevance20140601101859

Why solar energy has systemic relevance

1 June 2014
Giuseppe Artizzuwww.qualenergia.it // june 2014Photovoltaics has assumed a role, sometimes that is a dominant one in the coverage of daily requirements. Its cost, especially in southern Italy, is competitive with that of fossil fuels. The near future is auto-consumption and accumulation. How can we change the logic of the electricity market? Giuseppe Artizzu’s article published in the latest issue of the magazine QualEnergia. In 2013 photovoltaics covered 7% of Italian electric requirements, a share that has no equal in the world. But due to the seasonal profile and time, this figure is not ...
Hybrid distributed generation system for a rural village in Africa20140924101550

Hybrid distributed generation system for a rural village in Africa

24 September 2014
M. S. Carmeli, P. Guidetti, M. Mancini, S. Mandelli, M. Mauri, M. Merlo, R. Perini, G. Tomasini, G. Marchegiani, D. Rosati3rd Renewable Power Generation Conference (RPG 2014), pp. 1-6 // 24-25 September 2014Nowadays the use of distributed generating systems, which use a renewable energy source, has experienced a fast development. Moreover, their intrinsic intermittent nature can be overcome using hybrid systems which combine more energy sources. This paper proposes the study and design of a hybrid generation system able to cover the energy needs of a school in a rural village in Africa (Tanzan...
Opec had no choice20150101095210

Opec had no choice

1 January 2015
Giuseppe Artizzuwww.huffingtonpost.it // january 2015The long-awaited Opec Summit in Vienna on thursday ended with nothing concrete: cartel production in 2015 will remain the current one, despite the collapse of more than 30% of barrel price since this summer. Who has interpreted the decision as a deliberate choice by the Saudis to make a price war on American producers is wrong. Opec had no choice, the financial perspectives are grave for weaker members of the cartel, such as Venezuela and Nigeria, in a context of low oil prices. What determines the excess supply on the international oil mark...
Technical Strategies for Voltage Power Regulation in LV Distribution Networks20150101095408

Technical Strategies for Voltage Power Regulation in LV Distribution Networks

1 January 2015
M. Delfanti, L. Frosio, G. Monfredini, M. Merlo, C. Rosati, D. Rosati, G. MarchegianiDistributed Generation and Alternative Energy Journal, vol. 30, no.4, pp. 7-14 // 1 January 2015We report the integration of a novel voltage regulation strategy in the inverter control algorithm for Dispersed Generation (DG) applications. The adoption of a decentralized voltage control based on local curves allows the voltage profile to be controlled at the Point of Common Coupling (PCC) of the generators and, therefore, the capacity of existing distribution networks to host more generation from renewables. Th...
Electricity tariff reform – Discourages energy efficiency20150201094945

Electricity tariff reform – Discourages energy efficiency

1 February 2015
Giuseppe Artizzuwww.qualenergia.it // february 2015The solution suggested by the authority to resolve problems is to penalise and shift part of the financial burden on to those who produce renewable energy power, which seems to be contrary to what the legislations state. Here follows Giuseppe Artizzu’s opinion on the proposal for reform of the electricity rates of residential customers. Having summarized the proposed reform of the electricity rates for residential customers deeply discussed by the energy authority, we will host a debate about it on the following pages. We have published the ...
Hybrid micro-grid experimental application in Tanzania20150616094750

Hybrid micro-grid experimental application in Tanzania

16 June 2015
M. S. Carmeli, M. Mauri, C. Brivio, P. Guidetti, S. Mandelli, M. Merlo, R. Perini, G. Marchegiani, D. Rosati2015 International Conference on Clean Electrical Power (ICCEP) // 16-18 June 2015This paper is intended to introduce the project Energy4Growing that aims at studying and setting up a hybrid micro-grid to supply power to a school in rural Tanzania. It describes the results of the early project actions which concerned in: (i) analysing the actual school power supply system through locally metered data; (ii) developing the first step of a new electro-mechanical model which addresses the si...
Load more