Elis Nycander

Elis Nycander

Doctor of Engineering

About

20
Publications
1,690
Reads
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71
Citations
Citations since 2017
20 Research Items
71 Citations
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20172018201920202021202220230102030
20172018201920202021202220230102030

Publications

Publications (20)
Conference Paper
Full-text available
In aggregated power system models, hydro power is used to even out the price fluctuations as much as possible. For power systems with a significant share of hydro power, this results in price profiles which are almost flat. Contrary to this behaviour, the prices in the Nordic countries show considerable daily fluctuations. As a result, a centralize...
Article
Full-text available
We propose a power-based unit commitment formulation with capacity and intra-hour ramp reserves for dealing with intra-hour wind power variability and uncertainty. Although the formulation has an hourly resolution, the intra-hour ramp requirements capture wind power ramp excursions with a time duration below one hour, and thus allows the formulatio...
Preprint
Full-text available
In aggregated power system models, hydro power is used to even out the price fluctuations as much as possible. For power systems with a significant share of hydro power, this results in price profiles which are almost flat. Contrary to this behaviour, the prices in the Nordic countries show considerable daily fluctuations. As a result, a centralize...
Preprint
Full-text available
This paper presents power-based unit commitment (UC) formulations with N-1 security constraints. Two different formulations are proposed, one with constant reserves within the hour and one with time-varying reserves. The formulations are compared to a conventional energy-based UC formulation using different examples. We show that the energy-based f...
Article
This paper presents ODIN, an open dispatch model for the Nordic power system. We begin by performing a survey of existing models, and conclude that no model which simulates the different price areas in the Nordic power system and is truly open exists. Existing models either lack data to do an out-of-the-box simulation which accurately represents th...
Article
The planning of future power systems with high shares of renewable generation requires modelling large and complex systems over long time periods, resulting in models which are computationally heavy to solve. For this reason methods that can be used to decrease the size of power system dispatch models are needed. A common method in large scale plan...
Preprint
Full-text available
This paper presents an openly available dispatch model for the Nordic power system. We begin by performing a survey of existing models, and conclude that no model which simulates the different price areas in the Nordic power system and is truly open exists. Existing models either lack data to do an out-of-the-box simulation which accurately represe...
Article
This paper presents a security constrained unit commitment (SCUC) with continuous intra-hour time-varying reserves. The hourly formulation extends the power-based UC formulation and has reserves which vary continuously within the hour, as opposed to the traditional hourly energy-based SCUC that uses constant reserves within the hour. We show that t...
Preprint
Full-text available
We propose a power-based unit commitment (UC) formulation with capacity and intra-hour ramp reserves for dealing with intra-hour wind power variability and uncertainty. Although the formulation has an hourly resolution, the intra-hour ramp requirements capture wind power ramp excursions with a time duration below one hour, and thus allows the formu...
Conference Paper
Efficient integration of variable renewable energy (VRE) such as wind power into power systems requires methods for power system operation planning that account for VRE uncertainty and variability. This has motivated extensive research into unit commitment (UC) and optimal power flow (OPF) formulations with VRE uncertainty. However, these formulati...
Article
To lower CO2 emissions, policy makers want to integrate as much variable renewable energy (VRE) as possible into power systems. This has been translated into targets for VRE as a share of total electricity generation and policies that aim to maximize the use of electricity available from VRE sources. However, in this paper we demonstrate that it is...
Preprint
pre>Efficient integration of variable renewable energy (VRE) such as wind power into power systems requires methods for power system operation planning that account for VRE uncertainty and variability. This has motivated extensive research into unit commitment (UC) and optimal power flow (OPF) formulations with VRE uncertainty. However, these formu...
Preprint
Full-text available
To lower CO2 emissions, policy makers want to integrate as much variable renewable energy (VRE) as possible into power systems. This has been translated into targets for VRE as a share of total electricity generation and policies that aim to maximize the use of electricity available from VRE sources. However, in this paper we demonstrate that it is...
Preprint
Full-text available
This paper presents a security constrained unit commitment (SCUC) with continuous intra-hour time-varying reserves. The hourly formulation extends the power-based UC formulation and has reserves which vary continuously within the hour, as opposed to the traditional hourly energy-based SCUC that uses constant reserves within the hour. We show that t...
Article
Full-text available
Although regular curtailment of wind power has not been necessary in the Nordic power system so far, rapidly increasing wind power capacity means that it may be needed in the future. To estimate the amount of curtailment in the future Nordic power system we develop an hourly dispatch model based on open data. The model is validated against historic...
Article
Full-text available
As the amount of wind power in power systems has increased, it has become necessary to curtail wind power in some high-penetration situations. In order to assess the need for curtailment arising from voltage stability considerations the authors develop a security constrained optimal power flow (SCOPF) for minimising the expected curtailment. The au...
Conference Paper
This paper proposes a hybrid model for electricity load forecasting. Symbolic regression is initially used to automatically create a regression model of the load. Then the explanatory variables and their transformations that have been selected in the model are used as input in an artificial neural network that is trained to predict the electricity...

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