J. Lassila

J. Lassila
Lappeenranta – Lahti University of Technology LUT · Department of Energy

Dr. (electrical engineering)

About

86
Publications
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849
Citations

Publications

Publications (86)
Article
Full-text available
This paper presents a methodology for rapid generation of synthetic transmission networks and uses it to investigate how a transmission distance-based value loss affects the overall grid power flow. The networks are created with a graph theory-based method and compared to existing energy systems. The power production is located on these synthetic n...
Article
Full-text available
The paper addresses technical implementation and system design of battery energy storage systems (BESSs) aimed to operate in a multitask environment. The chosen control approach is centralized control, but it relies strongly on the distributed control systems implemented locally on the sites. The proposed and described control architecture has been...
Article
This paper presents a methodology to promote the operation of combined heat and power (CHP) power plant in the liberalized energy markets. The methodology considers a combination of marketplaces available to the power plant for its end products heat and electrical power, with a special reference to electricity reserve market opportunities. A result...
Conference Paper
In a large-scale integration of distributed generation (DG), a hosting capacity reflects the technical limit for the adaption. Hosting capacity depends strongly on the existing electricity infrastructure and a profile of electricity demand of end-customers. Hosting capacity and economic feasibility of large-scale integration of PV relate strongly t...
Conference Paper
This paper considers opportunities of bioenergy-based combined heat and power (CHP) to balance fluctuation in solar and wind power. The paper studies participation of CHP production in an electrical power reserve, which provides opportunities to integrate more renewable energy production into the electrical system and also makes it possible to rais...
Conference Paper
This paper considers how power-based distribution tariffs encourage electricity end-users to invest in energy storages to reduce their peak loads. The study uses actual automatic meter reading (AMR) data from 30 000 customers the annual electricity consumption of which is less than 50 MWh. The customers locate in the area of a Finnish distribution...
Conference Paper
The objective of the paper is to develop an algorithm to estimate the profitability of energy storage operation in the balancing power market. The main reasons for this study are the fast growth of the PV battery market in the residential sector in the coming years and, at the same time, challenges related to the integration of huge amounts of rene...
Article
This paper provides a view to assess effects of supply security requirements in Finnish electricity distribution networks on network renovation demands. In the beginning of September in 2013 a new Electricity Market Act came into effect in Finland. It sets limits for duration of allowed interruptions. As a background of the act are long interruptio...
Conference Paper
The aim of the paper is to describe and introduce smart charging test environment and plug-in hybrid vehicle capable of smart charging and vehicle to grid functionality. Furthermore, the paper aims at demonstrating simple smart charging strategy in operation on smart charging test bed. The demonstration utilizes commercially available components an...
Conference Paper
Protection against wide-scale blackouts is a crucial part of the management of the modern electricity distribution business. Although the everyday reliability of electricity distribution has been significantly improved by network automation solutions and new construction techniques over the past few decades, the challenge of major storms and long-l...
Article
The popularity of underground cables to replace overhead lines is increasing. This is partly a consequence of the requirement for better reliability and supply security. In some countries, the authorities have set maximum interruption durations for distribution system operators to steer the operators to avoid the use of overhead lines. However, alt...
Conference Paper
Extreme weather conditions challenge electricity distribution from time to time. In the Nordic countries, strong wind and snow storms together with the high rate of overhead lines located in forests create demanding conditions for the distribution business. To meet the requirements of modern society, management of major blackouts plays a significan...
Conference Paper
The aim of this paper is to describe and discuss about the main objectives and functions of the Energy Management System (EMS) of the Green Campus Smart Grid (GCSG). The main objectives of the Green Campus Smart Grid project are to realise fully functional smart grid (SG) environment, to demonstrate the functions of the smart grid and to function a...
Conference Paper
Energy storage system technologies have been developed within the recent years. The energy capacity of the storages has been increased and also more power can be discharged from the storages. The development has opened new possibilities to utilise energy storages. The technical success has been the key factor but also falling prices of energy stora...
Article
The nature of transport and energy use is radically changing along with the upward trend of electric vehicles (EVs). This poses a challenge for the existing electricity distribution infrastructure. Key questions are: what efforts are required to guarantee that the network infrastructure has sufficient capability to deliver energy and power to the c...
Article
Many countries have adopted economic regulation to the electricity distribution. Economic regulation plays a significant role when long-term decisions are determined. The regulatory model sets the framework for the network planning process. It does not give strict instructions for the planning process but aims to ensure the development of the netwo...
Conference Paper
The interest in electric vehicles (EVs) is rapidly increasing, and the upward trend seems to continue also in the future. As a result of the increasing energy consumption, the grid infrastructure has to be developed further, and moreover, it is necessary to analyze the network effects of the electric vehicle charging. In this paper, the challenge i...
Conference Paper
Full-text available
Electricity distribution networks face lots of challenges within the next decade. The structure and topology of the networks stem mostly from the early days of the electricity distribution even from 50s. The changes in the society around the distribution network have been significant. The requirements of the supply security have been tightened and...
Article
Purpose – Underground cabling has become a true alternative in construction of electricity distribution networks, even in rural areas. The increasing amount of underground installations requires strategic work that helps to define the most profitable cabling targets. The purpose of this paper is to introduce a methodology to consider the undergroun...
Article
The nature of transport and energy use is radically changing along with the upward trend of electric vehicles. The rapid technological development of electrical vehicles opens new opportunities from the electricity distribution point of view. Efficiency can be improved by implementing energy storages to the grid and cutting the load peaks by feedin...
Conference Paper
Strategic planning has become a significant element in the electricity distribution. Requirements and commitments to distribution system operators (DSOs) have increased and ageing distribution infrastructure causes its own challenges. At the same time the efficiency of computers has increased and software development has been quick that has provide...
Conference Paper
The Aim of this paper is to introduce the implementation of Smart Grid environment in the Green Campus project. Green Campus project is a combination of existing low voltage customer network with smart grid elements. The goal of this project is to have an actual field implementation of smart grid with load control, distributed generation and energy...
Article
The number of electric vehicles (EVs) is rapidly increasing, and the upward trend seems to be continuing also in the future. The increasing number of electric vehicles causes a need to develop the charging infrastructure, and moreover, it is necessary to analyze the network effects of the simultaneous charging of numerous electric vehicles. A furth...
Article
Purpose – The purpose of this paper is to establish a methodological framework to address key issues in electricity distribution network development. The paper defines subtasks in the strategy process and presents key elements in the strategy work and long-term network planning. The results are illustrated by a case network. Design/methodology/appr...
Article
High supply security is one of the key elements in the modern electricity distribution and smart grids. A reason for this is that reliable electricity distribution is almost a vital necessity for today's society. Most of the functions in the community are dependent on electricity, and if the distribution of this essential commodity is interrupted f...
Conference Paper
Full-text available
Good electricity supply availability is turning out to be more and more important for today's society as the electricity dependability increases. Furthermore, high availability of electricity supply is one of the commonly recognized targets of Smart Grid visions. Enhancing the supply availability call for technology investments and reorganization o...
Article
The role of electricity has become more significant in today's society; electricity distribution has to be reliable and there should be no outages. Incentives from economic regulation support this direction of development. Therefore, there is a demand for development of distribution networks. The key question is, from which viewpoint the issue of r...
Article
Full-text available
In Finland, new reliability criteria for electricity distribution companies have been analysed, and now, the implementation of the criteria is being discussed. The criteria cover the customer-based cumulative sum of durations of long interruptions and the cumulative number of short interruptions. The criteria are established by the Finnish Energy I...
Article
Purpose – Based on literature and an empirical case, the purpose of this paper is to present a framework for decision-making in utilities where unbundling considerations are taking place. The paper analyses the implications of splitting long-term network planning activity from the organization responsible for short-term network operation activities...
Conference Paper
Full-text available
Power electronic converters have growing importance in electricity distribution, generation, and in energy use. Therefore, it is relevant to study how the shorter lifetimes of power electronics compared to the traditional network components affect on the reliability of the electricity distribution and to its total costs. The main contribution of th...
Conference Paper
Full-text available
The role of electricity has become more significant in today's society; electricity distribution has to be reliable and there should be no outages. Furthermore, ageing of networks is an issue that has to be taken into account. Underground cabling will be one of the basic elements in renovation of rural area overhead (OH) line distribution networks....
Conference Paper
Full-text available
Electricity distribution technology is taking remarkable step by implementing the low-voltage DC-technology (LVDC) to the distribution networks. The first installations of this economical, transmission capacity and power quality increasing innovation in public electricity distribution will be done in coming years. Recent research results shows that...
Conference Paper
The leading themes in the distribution network development are the cost effectiveness and system reliability. Also the requirements for reducing pollution and increasing the service quality are issues, which have led to the introduction of SmartGrids network concepts. These network solutions are mostly dependent on power electronics, applied to con...
Conference Paper
Full-text available
Electricity distribution technology is taking remarkable step by implementing the low-voltage DC-technology to the distribution networks. The first installations of this economical, transmission capacity and power quality increasing innovation in public electricity distribution will be done in coming years. Recent research results shows that there...
Conference Paper
In this paper, the dependences between the regulation model and investment strategies are analysed. Regulatory effects are analysed by theoretical analysis and with practical examples. The main aim of the analysis is to show out how companies might adapt to the regulatory environment when deciding their investment strategies.
Conference Paper
The reliability requirements and the role of the supervisory authority in the electricity distribution business have grown strongly in the past few years. Electricity distribution companies are forced to consider new investment strategies to meet the challenges arising from the new operational environment. Aged electricity networks are subject to t...
Article
Full-text available
There is an increasing trend towards using the concept of risk assessment as an important tool in distribution system asset management. The paper presents a framework of three main stages in the process of risk management for distribution companies being 'Risk Study Planning', 'Risk Scenario Identification', and 'Risk Modelling – Analysis – Decisio...
Article
Full-text available
Today's electricity distribution networks construct mainly of the three-phase AC-systems. Consumer voltage in traditional distribution system is 230/400 V and the nominal frequency in Europe is 50 Hz. The European Union (EU) low voltage directive (LVD 72/23/EEC) [1] defines the boundaries for the low voltage (LV) levels used in public distribution...
Article
Full-text available
Nowadays electricity distribution networks construct mainly of the three-phase AC systems. Consumer voltage in traditional distribution system is 230/400 V and the nominal frequency in Europe is 50 Hz. Expectations both on electricity distribution techniques and the distribution business are growing. One of the leading themes in developing low volt...
Article
Full-text available
Storms cause major disturbances and serious damage to electricity distribution yearly. In these cases the customers and networks located to rural area obviously suffer the most. The consequences of major disturbances can mainly be affected by network development and the most effective technique is underground cabling. Large-scale changes of the net...
Article
Full-text available
The long-term development of the distribution networks and investment strategies is topical all over the world. Network owners and operators are facing the challenge of aging infrastructure and a need for massive reinvestments. Expectations for better reliability regardless of the state of operating (normal situation or a major event) have increase...
Book
Full-text available
Available at: http://www.merinova.fi/tiedostopankki/Visionary_network_final3a_85.pdf
Article
Electric utilities are enforced to control trustworthily total lifetime costs caused by their network components without jeopardizing the reliability and security of the network. New distribution planning methods and procedures are needed in order to meet the expectations and performance targets of regulators, company owners, and customers in the r...
Conference Paper
Full-text available
Expectations both on electricity distribution techniques and the distribution business are growing. The EU low voltage directive (LVD 72/23/EEC) [1] enables the use of 1 kV low voltage level as a third distribution voltage level between the traditional 20 kV and the 0.4 kV networks. This has proved to be a cost-efficient solution to enhance the rel...
Conference Paper
Full-text available
Modern society is dependent on electricity distribution. The expectations for more reliable and continuous electricity are growing all the time. Short and long outages in electricity distribution have shown the vulnerability of modern society. The customers' quality consciousness and the role of energy market authority have grown during the last ye...
Conference Paper
In this paper, electricity distribution investment strategies are analyzed in a new business environment. The worldwide problems related to aging networks, climatic challenges, public regulation and loss of expertise in distribution companies have to be solved to ensure profitability of the business in the future. On the other hand, there already a...
Conference Paper
The possibility of using the 20/1/0.4 kV system in underground cable networks was approached during the economical efficiency analysis of the 1 kV low voltage system. These studies indicated that an alternative worth considering is the use of 1 kV low voltage underground cables instead of medium voltage underground cables in some applications. A pa...
Article
Objective of this research was to create the long term vision of a distribution network technology to be used for the near future rebuild and necessary R&D efforts. Present status of the grid was briefly handled and created scenarios for the operational environment changes and available technology International view was used for getting familiar wi...
Conference Paper
Electricity distribution companies throughout Europe are facing same basic problems. The demand of better power quality is increasing and in the same time distribution networks are ageing and should be replaced. Due to the regulated nature of electricity distribution business there is also a demand from electricity market authorities for good quali...
Conference Paper
Electric utilities are enforced to control trustworthily total lifetime costs caused by their network components without jeopardizing the reliability and security of the network. New distribution planning methods and procedures are needed in order to meet the expectations and performance targets of regulators, company owners and customers in the re...
Conference Paper
In this paper economic analysis of investment decisions and outage costs is given. The methods to determine outage costs in distribution company's viewpoint are presented. The effects of regulation are taken into account in cost valuating process. The paper also present methods to compose interruption costs using actual interruption data and custom...
Conference Paper
Full-text available
In this paper methods to take power quality factors (e.g. number and duration of planned and unplanned interruptions, number of auto-reclosing operations) account into efficiency benchmarking as outage costs is presented. The effects of outage costs in efficiency benchmarking are evaluated by means of sensitivity analyses. Effects of power quality...
Conference Paper
The need to improve the quality and economy of the electricity distribution process has increased year by year. An interesting new innovation in the distribution network development has been the use of 1000 V (1 kV) low voltage lines together with 20 kV and 0.4 kV systems. The 1000 V low voltage distribution system gives an opportunity to answer to...
Conference Paper
Full-text available
This paper describes the electricity distribution business regulation in the Nordic countries — Norway, Sweden and Finland and the measures taken to comply with the new electricity market directive (2003/54/EC). The different characteristics of the regulation are outlined and compared — especially focusing on the efficiency requirements, power qual...
Conference Paper
Full-text available
Norway, Finland and Sweden have been in the leading edge in the deregulation of the power market. In Norway the deregulation process started in 1991, in Finland in 1995 and in Sweden in 1996, respectively. Electricity distribution has remained as natural monopoly in deregulated power market, which means supervision of distribution companies by the...