Helge V. Larsen

• M.Sc., Ph.D.
• Professor Emeritus at Technical University of Denmark

To assess future challenges for the energy system, the transmission - and distribution grids, long-term projections of the spatial distribution of electricity consumption with an hourly resolution is important. Based on 2015 data from hourly meters in Denmark, we develop a model that converts national projections of the annual electricity consumpti...

One policy aiming to increase system flexibility is to expose customers to hourly market prices giving them incentives to increase demand flexibility. This chapter presents hourly consumption profiles for categories of customers and analyzes how hourly time‐of‐use pricing affects the different categories of customers. Analyzing seasonal variations,...

Assessing grid developments the spatial distribution of the electricity consumption is important. In Denmark the electricity grid consists of transmission - and local distribution grids with different voltages that are connected via transformer stations each covering a local area with between 10.000 and 100.000 customers. Data for the hourly electr...

Studies of the aggregated hourly electricity load in geographical areas typically show a systematic variation over the day, the week, and seasons. With hourly metering of individual customers, data for individual consumption profiles have become available. Looking into these data we show that consumption profiles for specific categories of customer...

Data for aggregated hourly electricity demand shows systematic variations over the day, week, and seasons, and forecasting of aggregated hourly electricity load has been the subject of many studies. With hourly metering of individual customers, data for individual consumption profiles is available. Using this data and analysing the case of Denmark,...

In the EU and in Denmark, the aim is to reduce dependence on fossil fuels and to use energy more efficiently. District heating and combined heat and power have significant potential with regard to achieving this aim. New technologies may make individual solutions such as electric heating, heat pumps and micro-CHP more attractive than previously. Th...

Since 1994, Danish waste treatment plants have been obliged to report to the Danish EPA the annual amounts of waste treated. Applying these data, we analyse the development, link amounts of waste to economic and demographic variables, and present a model for the generation and treatment of waste in Denmark. Using the model and official projections...

Denmark, east and west of the Great Belt are bidding areas with separate hourly area prices for the Nord Pool power exchange, covering four Nordic countries and parts of Germany. The share of wind power has now increased to 25% on an annual basis in western Denmark. This has a significant impact not only on the electricity wholesale prices, but als...

The aim of the project is to analyse the potential synergistic interplay that may arise between the power sector and the transport sector, if parts of the road transport energy needs are based on electricity via the utilisation of plug-in hybrid electric vehicles and pure electric vehicles.

In thermal based electricity systems, increasing the share of intermittent production (mainly wind power) implies an increase in the volatility of marginal production costs. In liberalised electricity markets these variations are revealed in the market price and economists argue for exposing customers to the varying prices sending the right price s...

The report is available at http://www.ewea.org/publications/reports/integrating-wind/

When the European Union adopted the Directive on End-of-Life Vehicles (ELVs) in 2000, it was estimated that 8 to 9 million tonnes of waste from used cars was generated every year. However, it is likely that this amount will increase to somewhere between 14 and 17 million tonnes in 2015. The directive aims at limiting the use of hazardous substances...

Denne rapport udgør et delbidrag af rapporteringen fra projektet ” Effektiv fjernvarme i fremtidens energisystem”, som under Energistyrelsens Energiforskningsprogram (EFP) udføres af et konsortium af EA-energianalyse, Systemanalyseafdelingen på Risø DTU, RAM-løse edb samt Fjernvarmens visionsudvalg nedsat under Dansk Fjernvarmeforening. Formålet me...

The use of materials and the generation of waste are linked to economic activities and in many projections these are assumed to be a constant ratio of the economic activities. This may be the case considering detailed economic activities and unchanged technology. However, the assumption of constant coefficients is questionable when linking material...

This paper describes a model for the projection of the number of End-of-Life Vehicles (ELVs) and presents a baseline projection. Historical data on population, the number of cars per capita (car density), GDP per capita, and the vintage distribution of cars are combined to model ELVs. The lifetime of vintages of cars is described by a Weibull distr...

Work on aggregation of district heating networks has been in progress during the last decade. Two methods have independently been developed in Denmark and Germany. In this article, a comparison of the two methods is first presented. Next, the district heating system Ishoej near Copenhagen is used as a test case.For the 23 substations in Ishoej, hea...

Scenarios for a transition to a hydrogen society are constructed for Denmark. The physical basis for the scenarios is the exploitation of renewable energy resources already in progress in Denmark. Hydrogen is proposed as a convenient energy carrier due to its versatility in use, transmission and as an energy storage medium. Two main scenarios are c...

The dynamic properties of district heating (DH) networks include water flow and propagation of heat from production plants to consumers. Mathematical models of such networks can be applied, either for general understanding of DH systems, or in combination with production planning and optimization.One type of mathematical model involves a full physi...

Contract 524110/0010 This report does not necessarily fully reflect the views of each of the individual participant countries of the Implementing Agreement on District Heating and Cooling, including the integration of CHP.

During the last two decades of operational experience with wind turbines in Denmark, a number of investigations on wind energy economics have been carried out on behalf of the Danish Energy Agency. The aim of this study has been to analyse the developmentof investments cost, O&M-cost, insurance costs etc. including the economic and technical lifeti...

Simulating the flow and transient temperatures in a district heating (DH) network can be performed in various ways and to various degrees of accuracy. However, the time needed for the computations may be excessive and it is therefore desirable to reduce this time in some way. In this paper we present a method in which an original model of a DH netw...

Expansion planning of combined heat and power systems requires simulation tools for estimating key indicators for decision making. For power systems, so-called probability production simulation techniques have been used extensively. These techniques have been extended to include combined heat and power (CHP) systems with a single heat area and back...

This thesis is submitted as part of the requirements for the technical licentiate degree (Ph.D.) at the Technical University of Denmark. The study has been carried out at Risoe National Laboratory in close cooperation with professor J. Rich. Hansen at the Electric Power Engineering Department of the Technical University. The principal aim of the re...