Matti Lehtonen

Bio: Matti Lehtonen is an academic researcher from Aalto University. The author has contributed to research in topics: Fault (power engineering) & Electric power system. The author has an hindex of 40, co-authored 694 publications receiving 8559 citations. Previous affiliations of Matti Lehtonen include Razi University & New York University.

Transactive-based control algorithm for real-time energy imbalance minimisation in microgrids

Abstract: Publisher Copyright: © 2020 Institution of Engineering and Technology. All rights reserved.

Slime Mold Inspired Distribution Network Initial Solution

Abstract: Electricity distribution network optimisation has attracted attention in recent years due to the widespread penetration of distributed generation. A considerable portion of network optimisation algorithms rely on an initial solution that is supposed to bypass the time-consuming steps of optimisation routines. The aim of this paper is to present a nature inspired algorithm for initial network generation. Based on slime mold behaviour, the algorithm can generate a large-scale network in a reasonable computation time. A mathematical formulation and parameter exploration of the slime mold algorithm are presented. Slime mold networks resemble a relaxed minimum spanning tree with better balance between the investment and loss costs of a distribution network. Results indicate lower total costs for suburban and urban networks.

An improved initial network for distribution network planning algorithms

Abstract: This paper proposes a pragmatic method for generating an initial electricity distribution network topology that minimizes the time-expensive optimization requirements to produce a close-to-optimum solution network. The argument is made that an algorithm that realistically considers the factors that influence the topology and specifications of a distribution network from the outset is as important as the optimization procedure, and given the myriad close-to-optimum solutions and the impossibility of reaching the theoretically optimum solution in real network plans, a good initial network is extremely valuable. Accordingly, a previously published method to produce initial networks, where the initial power flow assumed that loads and substations were homogeneous, is extended and refined to cope with the heterogeneous nature of real networks

A virtual power plant for the aggregation of domestic heating load flexibility

Abstract: Demand-side is becoming more active in various power system operations as it is able to provide the system with extra flexibility to balance the volatility of the generationside. Suggested applications can vary from short term emergency control to participation in a day-ahead market. In order to improve the presence of demand response in these operations, this paper describes a virtual power plant (VPP) for domestic heating load aggregation. The main contribution is to introduce the three states of VPP operation: normal, emergency and restoration that allow loads to participate in the maintaining of consumption-generation balance in different time scales. Furthermore, the study discusses a multi-agent system (MAS) approach to implement the proposed VPP. The VPP operation is demonstrated and tested by dynamic simulations.

I and i

Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

The Design and Analysis of Experiments

Abstract: THE DESIGN AND ANALYSIS OF EXPERIMENTS. By Oscar Kempthorne. New York, John Wiley and Sons, Inc., 1952. 631 pp. $8.50. This book by a teacher of statistics (as well as a consultant for \"experimenters\") is a comprehensive study of the philosophical background for the statistical design of experiment. It is necessary to have some facility with algebraic notation and manipulation to be able to use the volume intelligently. The problems are presented from the theoretical point of view, without such practical examples as would be helpful for those not acquainted with mathematics. The mathematical justification for the techniques is given. As a somewhat advanced treatment of the design and analysis of experiments, this volume will be interesting and helpful for many who approach statistics theoretically as well as practically. With emphasis on the \"why,\" and with description given broadly, the author relates the subject matter to the general theory of statistics and to the general problem of experimental inference. MARGARET J. ROBERTSON

World energy outlook

Abstract: This chapter discusses leading problems linked to energy that the world is now confronting and to propose some ideas concerning possible solutions. Oil deserves special attention among all energy sources. Since the beginning of 1981, it has merely been continuing and enhancing the downward movement in consumption and prices caused by excessive rises, especially for light crudes such as those from Africa, and the slowing down of worldwide economic growth. Densely-populated oil-producing countries need to produce to live, to pay for their food and their equipment. If the economic growth of the industrialized countries were to be 4%, even if investment in the rational use of energy were pushed to the limit and the development of nonpetroleum energy sources were also pursued actively, it would be extremely difficult to prevent a sharp rise in prices. It is evident that it is absolutely necessary to pursue actively the development of coal, natural gas, and nuclear power if a physical shortage of energy is not to block economic growth.