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Publications (10 of 334) Show all publications
Söder, L., Lund, P. D., Koduvere, H., Bolkesjø, T. F., Rossebø, G. H., Rosenlund-Soysal, E., . . . Blumberga, D. (2018). A review of demand side flexibility potential in Northern Europe. Renewable & sustainable energy reviews, 91, 654-664
Open this publication in new window or tab >>A review of demand side flexibility potential in Northern Europe
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2018 (English)In: Renewable & sustainable energy reviews, ISSN 1364-0321, E-ISSN 1879-0690, Vol. 91, p. 654-664Article, review/survey (Refereed) Published
Abstract [en]

The number of regional and national power systems with a high share of wind and solar power in the world is quickly increasing. The background for this development is improved technology, decreasing costs, and increased concern regarding environmental problems of competing technologies such as fossil fuels. For the future there are large possibilities for increasing the renewable electricity share. However, variable renewable power production has to be balanced. Demand side flexibility offers an interesting approach to the balancing issues. The aim of this paper is to compare flexibility potentials and how they were estimated in seven Northern European countries in order to compare general challenges and results as well as the connection between used method and results. The total flexibility is estimated to 12–23 GW in a system with a total peak load of 77 GW.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Balancing, Demand side management, Flexibility, Solar power, Wind power
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-227514 (URN)10.1016/j.rser.2018.03.104 (DOI)2-s2.0-85045627732 (Scopus ID)
Note

QC 20180516

Available from: 2018-05-16 Created: 2018-05-16 Last updated: 2018-05-16Bibliographically approved
Ren, G., Wan, J., Liu, J., Yu, D. & Söder, L. (2018). Analysis of wind power intermittency based on historical wind power data. Energy, 150, 482-492
Open this publication in new window or tab >>Analysis of wind power intermittency based on historical wind power data
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2018 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 150, p. 482-492Article in journal (Refereed) Published
Abstract [en]

As wind power provides an increasingly larger share of electricity supply, the challenges caused by wind power intermittency have become more and more prominent. A better understanding of wind power intermittency would contribute to mitigate it effectively. In the present study, the definition of wind power intermittency is given firstly. Based on the definition, wind power intermittency is quantified by duty ratio of wind power ramp (DRWPR). This index provides system operators quantitative insights into wind power intermittency. Furthermore, some characteristics of wind power intermittency can be extracted by the index, such as the differences between wind speed intermittency and wind power intermittency, the differences of wind power intermittency between different scales and so on. The wind power intermittency of a Chinese wind farm is studied in detail based on the proposed index and historical data.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Characteristics, Duty ratio, Forecasting, Intermittency, Ramp event, wind power
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-227592 (URN)10.1016/j.energy.2018.02.142 (DOI)000431748400038 ()2-s2.0-85042848108 (Scopus ID)
Note

QC 20180518

Available from: 2018-05-18 Created: 2018-05-18 Last updated: 2018-05-31Bibliographically approved
Huang, Y. & Söder, L. (2017). Assessing the impact of incentive regulation on distribution network investment considering distributed generation integration. International Journal of Electrical Power & Energy Systems, 89, 126-135
Open this publication in new window or tab >>Assessing the impact of incentive regulation on distribution network investment considering distributed generation integration
2017 (English)In: International Journal of Electrical Power & Energy Systems, ISSN 0142-0615, E-ISSN 1879-3517, Vol. 89, p. 126-135Article in journal (Refereed) Published
Abstract [en]

In a deregulated power system, incentive regulations for network owners are designed to direct the network investment. An innovative method that assesses the incentive regulation in distribution networks is proposed in this paper. The method quantifies the interplay between incentive regulation, network investment, and network performances. It allows regulators and the distribution system operators (DSOs) evaluating the economic effects of investments within the incentive regulation framework. Considered network investments include the investment in network infrastructure and performance improving. The assessment is based on a network investment optimization model considering multi-period optimal power flow and regulatory constraints. The main contributions of this paper include the modeling of the incentive regulations and the quantification of the impacts of incentive regulation on network infrastructure investment and performance improving investment. 

Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
Network investment, Distributed generation, Incentive regulation, Revenue cap regulation, Performance incentive regulation
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-201705 (URN)10.1016/j.ijepes.2017.01.018 (DOI)2-s2.0-85012078042 (Scopus ID)
Funder
StandUp
Note

QC 20170221

Available from: 2017-02-14 Created: 2017-02-14 Last updated: 2017-11-29Bibliographically approved
Nilsson, M., Söder, L. & Ericsson, G. (2017). Balancing Strategies Evaluation Framework Using Available Multi-Area Data. IEEE Transactions on Power Systems
Open this publication in new window or tab >>Balancing Strategies Evaluation Framework Using Available Multi-Area Data
2017 (English)In: IEEE Transactions on Power Systems, ISSN 0885-8950, E-ISSN 1558-0679Article in journal (Refereed) Published
Abstract [en]

The penetration of variable RES, the deregulation of electricity markets, and the expansion of HVDC- transmission capacities all increase the variability, uncertainty, and imbalances for System Operators (SOs) to handle. Meanwhile, frequency quality has deteriorated and occurrence of balancing problems has increased. Therefore, there is an increased need for SOs to improve their balancing strategies. In this paper we present a new balancing evaluation framework. The main idea of the framework is to be applicable for real and large power systems and provide support for SOs when comparing already used balancing strategies with new ones using historical available data. This is important as only comparatively low-resolution data measurements, such as hourly-mean-values for production, consumption, and HVDC-transmission are stored in many power systems. The framework consists of model building, system parameter identification, testing different strategies and targets supporting the corporate missions of the SOs. In a case study, the framework is tested for a real power system where the model set-up mimics measured frequency accurately. The case study illustrates how the framework can be used to evaluate the impact of different balancing strategies on a series of selected targets which support the cooperate missions of ENTSO-E.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2017
Keywords
Balancing strategies, imbalance, multi-area, power system control, power system modeling, sustainable development, renewable energy sources, variability, uncertainty
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-221217 (URN)10.1109/TPWRS.2017.2736604 (DOI)000425530300012 ()2-s2.0-85028959814 (Scopus ID)
Note

QC 20180116

Available from: 2018-01-16 Created: 2018-01-16 Last updated: 2018-03-14Bibliographically approved
Stankovic, S. & Söder, L. (2017). Cable Impact on Integration of Wind and Solar Power. In: : . Paper presented at ELKRAFT Conference. Goteborg, Sweden
Open this publication in new window or tab >>Cable Impact on Integration of Wind and Solar Power
2017 (English)Conference paper, Poster (with or without abstract) (Refereed)
Place, publisher, year, edition, pages
Goteborg, Sweden: , 2017
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-219934 (URN)
Conference
ELKRAFT Conference
Note

QC 20171214

Available from: 2017-12-14 Created: 2017-12-14 Last updated: 2017-12-14Bibliographically approved
Söder, L., Pellinger, C., Lopez-Botet Zulueta, M., Milligan, M., Kiviluoma, J., Flynn, D., . . . O’Neill, B. (2017). Comparison of Integration Studies of 30-40 percent Energy Share from Variable Renewable Sources. In: 16th International Workshop on Large-Scale Integration of Wind Power into Power Systems as well as on Transmission Networks for Offshore Wind Power Plants, Berlin, 2017, article id WIW17-049: . Paper presented at 16th International Workshop on Large-Scale Integration of Wind Power into Power Systems as well as on Transmission Networks for Offshore Wind Power Plants, Berlin 25-27 October.
Open this publication in new window or tab >>Comparison of Integration Studies of 30-40 percent Energy Share from Variable Renewable Sources
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2017 (English)In: 16th International Workshop on Large-Scale Integration of Wind Power into Power Systems as well as on Transmission Networks for Offshore Wind Power Plants, Berlin, 2017, article id WIW17-049, 2017Conference paper, Published paper (Other academic)
Abstract [en]

The amount of wind and solar power in the world is quickly increasing. The background for this development is improved technology, decreased costs for the units, and increased concern regarding environmental problems of competing technologies such as fossil fuels. For the future there are large possibilities for increasing shares. However there have been questions raised concerning the challenges of integrating larger shares of variable renewable power such as wind and solar power. Because of this many studies have been performed concerning larger amounts of variable generation for different regions in the world. The aim of this paper is to compare seven of these ones in order to identify general challenges and results as well as the connection between used method and results. 

Keywords
Wind power, solar power, integration, power system, power transmission, frequency control, balancing of wind power.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-225381 (URN)
Conference
16th International Workshop on Large-Scale Integration of Wind Power into Power Systems as well as on Transmission Networks for Offshore Wind Power Plants, Berlin 25-27 October
Note

QC 20180411

Available from: 2018-04-03 Created: 2018-04-03 Last updated: 2018-04-11Bibliographically approved
Nilsson, M., Söder, L., Eriksson, R., Ghandari, M. & Ericsson, G. (2017). Designing new proactive control-room strategies to decrease the need for automatic reserves. In: 2017 IEEE PES Innovative Smart Grid Technologies Conference Europe, ISGT-Europe 2017 - Proceedings: . Paper presented at 2017 IEEE PES Innovative Smart Grid Technologies Conference Europe, ISGT-Europe 2017, Torino, Italy, 26 September 2017 through 29 September 2017.
Open this publication in new window or tab >>Designing new proactive control-room strategies to decrease the need for automatic reserves
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2017 (English)In: 2017 IEEE PES Innovative Smart Grid Technologies Conference Europe, ISGT-Europe 2017 - Proceedings, 2017Conference paper, Published paper (Refereed)
Abstract [en]

Maintaining automatic reserve capacities is essential for a sustainable and reliable power system. Today, many power systems experience more frequent frequency deviations coming from increased power variations. This implies an increased utilization of automatic reserves. To decrease frequency deviations, one can increase the automatic reserve capacities. However, the solution tends to be costly and ineffective. Therefore, it is urgent to develop better solutions to cease this trend. Here we have designed new proactive control-room strategies to decrease the need for automatic reserves. We design strategies for a process called Re-Scheduling of Generation and for the Tertiary Frequency Control process. The new control-room strategies are tested using an intra-hour model comparing already used strategies against new ones. It is shown that the historical used strategies are well executed. Nevertheless, results show that the proactive TFC-strategy using a forecasted frequency as control parameter would improve system security significantly.

Keywords
Control-Room Strategies, ENTSO-E, Intra-hour Simulation, Tertiary Frequency Control.
National Category
Control Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-221218 (URN)10.1109/ISGTEurope.2017.8260179 (DOI)000428016500088 ()2-s2.0-85046284932 (Scopus ID)978-1-5386-1953-7 (ISBN)
Conference
2017 IEEE PES Innovative Smart Grid Technologies Conference Europe, ISGT-Europe 2017, Torino, Italy, 26 September 2017 through 29 September 2017
Note

QC 20180116

Available from: 2018-01-16 Created: 2018-01-16 Last updated: 2018-06-01Bibliographically approved
Herre, L. & Söder, L. (2017). Enhancing market access of demand response through generation forecast updates. In: 2017 IEEE Manchester PowerTech, Powertech 2017: . Paper presented at 2017 IEEE Manchester PowerTech, Powertech 2017, Manchester, United Kingdom, 18 June 2017 through 22 June 2017. IEEE, Article ID 7981023.
Open this publication in new window or tab >>Enhancing market access of demand response through generation forecast updates
2017 (English)In: 2017 IEEE Manchester PowerTech, Powertech 2017, IEEE, 2017, article id 7981023Conference paper, Published paper (Refereed)
Abstract [en]

Advances in communication infrastructure and elec-tric appliances have enabled demand side participation in powersystem operation. However, the full potential of demand flexibilityis yet to be exploited. Existing demand response programs requireflexibility in a set time frame from the electricity consumers inreaction to economic incentives. For a more detailed qualitativeanalysis of consumer flexibility, not only price but also noticetime are imperative parameters. The former has been studied innumerous references whereas the impact of the latter has not yetbeen examined in depth. This paper presents a market modelof demand response that enhances an efficient use of flexibleconsumers by hourly updates. The consequences of flexibleelectricity consumers are studied in a Real Time Pricing modelwith continuous forecast updates, where elasticity is subject tonotice time. A case study is presented using data from Sweden.We conclude that current demand response programs are notoptimally designed to integrate consumer flexibility that changeswith the notice time. 

Place, publisher, year, edition, pages
IEEE, 2017
Keywords
demand side management, power system simulation, power system economics, smart grids, wind energy integration
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-209944 (URN)10.1109/PTC.2017.7981023 (DOI)000411142500234 ()2-s2.0-85034782630 (Scopus ID)978-1-5090-4237-1 (ISBN)
Conference
2017 IEEE Manchester PowerTech, Powertech 2017, Manchester, United Kingdom, 18 June 2017 through 22 June 2017
Note

QC 20170704

Available from: 2017-06-26 Created: 2017-06-26 Last updated: 2018-02-15Bibliographically approved
Risberg, D. & Söder, L. (2017). Hydro Power Equivalents of Complex River Systems. In: 2017 IEEE Manchester PowerTech, Powertech 2017: . Paper presented at 2017 IEEE Manchester PowerTech, Powertech 2017, Manchester, United Kingdom, 18 June 2017 through 22 June 2017. Institute of Electrical and Electronics Engineers (IEEE), Article ID 7981057.
Open this publication in new window or tab >>Hydro Power Equivalents of Complex River Systems
2017 (English)In: 2017 IEEE Manchester PowerTech, Powertech 2017, Institute of Electrical and Electronics Engineers (IEEE), 2017, article id 7981057Conference paper, Published paper (Refereed)
Abstract [en]

When a hydro power producer wants to plan the production for the next day in an optimal way a precise and detailed model is needed. But when using this model to plan for a longer period of time the computational complexity increases. To overcome this problem there is a need to do a model reduction of the original system into a smaller equivalent system with almost the same properties. This paper compares the performance and computation time of different setups in the equivalent representation of the original hydro power system. This includes different setups in both topology and the piecewise linear production equivalents. It is tested independently on two rivers with 21 and 28 stations respectively and also for the case if both of these rivers were to represented by one equivalent system. The performance is evaluated with respect to error in production and computation time. It is shown that with model reduction the relative error lies between 11.5 and 5.1 percent of installed capacity and the computation time is then reduced by 99.3 and 92.5 percent respectively.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2017
Keywords
hydro power, hydro power scheduling, optimization, model reduction, hydro power equivalents
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-215853 (URN)000411142500266 ()2-s2.0-85034783929 (Scopus ID)978-1-5090-4237-1 (ISBN)
Conference
2017 IEEE Manchester PowerTech, Powertech 2017, Manchester, United Kingdom, 18 June 2017 through 22 June 2017
Note

QC 20171016

Available from: 2017-10-16 Created: 2017-10-16 Last updated: 2018-02-14Bibliographically approved
Stankovic, S. & Söder, L. (2017). Identification of Reactive Power Provision Boundaries of a Distribution Grid with DFIGs to a Transmission Grid. In: 2017 IEEE PES Innovative Smart Grid Technologies Conference Europe, ISGT-Europe 2017 - Proceedings: . Paper presented at 2017 IEEE PES Innovative Smart Grid Technologies Conference Europe, ISGT-Europe 2017, Torino, Italy, 26 September 2017 through 29 September 2017. Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>Identification of Reactive Power Provision Boundaries of a Distribution Grid with DFIGs to a Transmission Grid
2017 (English)In: 2017 IEEE PES Innovative Smart Grid Technologies Conference Europe, ISGT-Europe 2017 - Proceedings, Institute of Electrical and Electronics Engineers (IEEE), 2017Conference paper, Published paper (Refereed)
Abstract [en]

Development of the distribution grids brings alsonew challenges. With efficient exploitation of all the availableresources in the grid, many related problems can be solved. Theproblem addressed in this paper is becoming more and morecommon in the practice. There is a need to control reactivepower exchange between the grids of different voltage levels. Thisneed becomes more pronounced with increasing penetration ofdistributed generation and cables in the system. But, the causeof the problem can be also a part of its solution. This papershows that it is possible to control the reactive power exchangeto a noticeable extent using the distributed generation locatedin the grid and the on-load tap changers. The results have beenobtained from the analysis of a representative model of Swedishdistribution network with installed DFIG wind turbines. Whilenot going deeper into the control strategies, the reactive powerboundaries of the system are identified. Critical elements arefound for different case scenarios. Solutions on adjustment ofreactive power capabilities of the grid are proposed.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2017
Series
IEEE PES Innovative Smart Grid Technologies Conference Europe, ISSN 2165-4816
Keywords
DFIG, reactive power provision, radial distribution grid, voltage control, wind power
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-219933 (URN)10.1109/ISGTEurope.2017.8260119 (DOI)000428016500028 ()2-s2.0-85046290526 (Scopus ID)978-1-5386-1953-7 (ISBN)
Conference
2017 IEEE PES Innovative Smart Grid Technologies Conference Europe, ISGT-Europe 2017, Torino, Italy, 26 September 2017 through 29 September 2017
Note

QC 20171214

Available from: 2017-12-14 Created: 2017-12-14 Last updated: 2018-06-01Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-8189-2420

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