Per Norrlund

Storage system optimization for enhancing frequency control from hydropower

Laban, Danilo; Norrlund, Per; Lundin, Urban

Ingår i Journal of Energy Storage, 2025

• DOI för Storage system optimization for enhancing frequency control from hydropower
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Storage System Design for Improved Primary Frequency Control From Hydropower Units

Laban, Danilo; Norrlund, Per; Lundin, Urban

Ingår i IEEE transactions on energy conversion, s. 1836-1844, 2023

• DOI för Storage System Design for Improved Primary Frequency Control From Hydropower Units

Electrical dump-loads increasing spill capacity

Strömme Mattsson, Adam; Norrlund, Per; Lundin, Urban

Ingår i Hydropower R&D days 2023., 2023

Kaplan turbine model validation for large grid frequency disturbances

Dahlborg, Elin; Norrlund, Per; Saarinen, Linn

Ingår i IEEE transactions on energy conversion, s. 611-618, 2021

• DOI för Kaplan turbine model validation for large grid frequency disturbances

Improving frequency control from Kaplan turbines to fulfill grid codes

Dahlborg, Elin; Norrlund, Per; Saarinen, Linn; Lundin, Urban

Ingår i HYDRO 2019, Porto, Portugal, 14-16 October, 2019., 2019

• Ladda ner fulltext (pdf) av Improving frequency control from Kaplan turbines to fulfill grid codes

Storage system optimization for enhancing frequency control from hydropower

Laban, Danilo; Norrlund, Per; Lundin, Urban

Ingår i Journal of Energy Storage, 2025

• DOI för Storage system optimization for enhancing frequency control from hydropower
• Ladda ner fulltext (pdf) av Storage system optimization for enhancing frequency control from hydropower

Storage System Design for Improved Primary Frequency Control From Hydropower Units

Laban, Danilo; Norrlund, Per; Lundin, Urban

Ingår i IEEE transactions on energy conversion, s. 1836-1844, 2023

• DOI för Storage System Design for Improved Primary Frequency Control From Hydropower Units

Kaplan turbine model validation for large grid frequency disturbances

Dahlborg, Elin; Norrlund, Per; Saarinen, Linn

Ingår i IEEE transactions on energy conversion, s. 611-618, 2021

• DOI för Kaplan turbine model validation for large grid frequency disturbances

Burden on hydropower units for short-term balancing of renewable power systems

Yang, Weijia; Sundqvist, Per; Saarinen, Linn; Witt, Adam et al.

Ingår i Nature Communications, 2018

• DOI för Burden on hydropower units for short-term balancing of renewable power systems
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Eigen-analysis of hydraulic-mechanical-electrical coupling mechanism for small signal stability of hydropower plant

Yang, Weijia; Norrlund, Per; Chung, Chi Yung; Yang, Jiandong et al.

Ingår i Renewable energy, s. 1014-1025, 2018

• DOI för Eigen-analysis of hydraulic-mechanical-electrical coupling mechanism for small signal stability of hydropower plant

Linear synthetic inertia for improved frequency quality and reduced hydropower wear and tear

Saarinen, Linn; Norrlund, Per; Yang, Weijia; Lundin, Urban

Ingår i International Journal of Electrical Power & Energy Systems, s. 488-495, 2018

• DOI för Linear synthetic inertia for improved frequency quality and reduced hydropower wear and tear

Hydraulic damping mechanism of low frequency oscillations in power systems: Quantitative analysis using a nonlinear model of hydropower plants

Yang, Weijia; Sundqvist, Per; Lidenholm, Johan; Yang, Jiandong et al.

Ingår i Applied Energy, s. 1138-1152, 2018

• DOI för Hydraulic damping mechanism of low frequency oscillations in power systems: Quantitative analysis using a nonlinear model of hydropower plants

Allocation of Frequency Control Reserves and its Impact on Wear and Tear on a Hydropower Fleet

Saarinen, Linn; Norrlund, Per; Yang, Weijia; Lundin, Urban

Ingår i IEEE Transactions on Power Systems, s. 430-439, 2018

• DOI för Allocation of Frequency Control Reserves and its Impact on Wear and Tear on a Hydropower Fleet

Wear reduction for hydro power turbines considering frequency quality of power systems: a study on controller filters

Yang, Weijia; Norrlund, Per; Saarinen, Linn; Yang, Jiandong et al.

Ingår i IEEE Transactions on Power Systems, s. 1191-1201, 2017

• DOI för Wear reduction for hydro power turbines considering frequency quality of power systems: a study on controller filters

Wear and tear on hydro power turbines: influence from primary frequency control

Yang, Weijia; Norrlund, Per; Saarinen, Linn; Yang, Jiandong et al.

Ingår i Renewable energy, s. 88-95, 2016

• DOI för Wear and tear on hydro power turbines: influence from primary frequency control

Response time for primary frequency control of hydroelectric generating unit

Yang, Weijia; Yang, Jiandong; Guo, Wencheng; Norrlund, Per

Ingår i International Journal of Electrical Power & Energy Systems, s. 16-24, 2016

• DOI för Response time for primary frequency control of hydroelectric generating unit
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A Mathematical Model and Its Application for Hydro Power Units under Different Operating Conditions

Yang, Weijia; Yang, Jiandong; Guo, Wencheng; Zeng, Wei et al.

Ingår i Energies, s. 10260-10275, 2015

• DOI för A Mathematical Model and Its Application for Hydro Power Units under Different Operating Conditions
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Field Measurements and System Identification of Three Frequency Controlling Hydropower Plants

Saarinen, Linn; Norrlund, Per; Lundin, Urban

Ingår i IEEE transactions on energy conversion, s. 1061-1068, 2015

• DOI för Field Measurements and System Identification of Three Frequency Controlling Hydropower Plants

Frequency Stability of Isolated Hydropower Plant with Surge Tank Under Different Turbine Control Modes

Yang, Weijia; Yang, Jiandong; Guo, Wencheng; Norrlund, Per

Ingår i Electric power components and systems, s. 1707-1716, 2015

• DOI för Frequency Stability of Isolated Hydropower Plant with Surge Tank Under Different Turbine Control Modes
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Torsional stability of hydropower units under influence of subsynchronous oscillations

Bladh, Johan; Sundqvist, Per; Lundin, Urban

Ingår i IEEE Transactions on Power Systems, s. 3826-3833, 2013

• DOI för Torsional stability of hydropower units under influence of subsynchronous oscillations

Stability of the notion of approximating class of sequences and applications

Serra-Capizzano, Stefano; Sundqvist, Per

Ingår i Journal of Computational and Applied Mathematics, s. 518-536, 2008

• DOI för Stability of the notion of approximating class of sequences and applications

Discrete fundamental solution preconditioning for hyperbolic systems of PDE

Brandén, Henrik; Holmgren, Sverker; Sundqvist, Per

Ingår i Journal of Scientific Computing, s. 35-60, 2007

• DOI för Discrete fundamental solution preconditioning for hyperbolic systems of PDE

Can one hear the composition of a drum?

Holmgren, Sverker; Serra-Capizzano, Stefano; Sundqvist, Per

Ingår i Mediterranean Journal of Mathematics, s. 227-249, 2006

• DOI för Can one hear the composition of a drum?

Preconditioners based on fundamental solutions

Brandén, Henrik; Sundqvist, Per

Ingår i BIT Numerical Mathematics, s. 481-494, 2005

• DOI för Preconditioners based on fundamental solutions

An algorithm for computing fundamental solutions of difference operators

Brandén, Henrik; Sundqvist, Per

Ingår i Numerical Algorithms, s. 331-343, 2004

• DOI för An algorithm for computing fundamental solutions of difference operators

Enhanced Inertia using amplified power response from synchronous machines compared with frequency derivative-based inertia

Fregelius, Martin; Albuquerque, Vinicius; Lundin, Urban; Norrlund, Per

Full scale hybrid hydroelectric lithium-ion energy storage for supplying frequency containment reserve

Fregelius, Martin; Lundin, Urban; Norrlund, Per

Numerical Computations with Fundamental Solutions

Sundqvist, Per

2005

• Ladda ner fulltext (pdf) av Numerical Computations with Fundamental Solutions

Time-domain modeling and a case study on regulation and operation of hydropower plants

Yang, Weijia; Yang, Jiandong; Guo, Wencheng; Norrlund, Per

Ingår i Modeling and Dynamic Behavior of Hydro Power Plants, Institution of Engineering and Technology, 2017

Electrical dump-loads increasing spill capacity

Strömme Mattsson, Adam; Norrlund, Per; Lundin, Urban

Ingår i Hydropower R&D days 2023., 2023

Improving frequency control from Kaplan turbines to fulfill grid codes

Dahlborg, Elin; Norrlund, Per; Saarinen, Linn; Lundin, Urban

Ingår i HYDRO 2019, Porto, Portugal, 14-16 October, 2019., 2019

• Ladda ner fulltext (pdf) av Improving frequency control from Kaplan turbines to fulfill grid codes

Analysis on regulation strategies for extending service life of hydropower turbines

Yang, Weijia; Norrlund, Per; Yang, Jiandong

2016

• DOI för Analysis on regulation strategies for extending service life of hydropower turbines
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Full-scale test and modelling of the frequency control dynamics of the Nordic power system

Saarinen, Linn; Norrlund, Per; Lundin, Urban; Agneholm, Evert et al.

Ingår i 2016 IEEE POWER AND ENERGY SOCIETY GENERAL MEETING (PESGM), 2016

• DOI för Full-scale test and modelling of the frequency control dynamics of the Nordic power system

Tuning primary frequency controllers using robust control theory in a power system dominated by hydropower

Saarinen, Linn; Norrlund, Per; Lundin, Urban

2016

Full-scale test and modelling of the frequency control dynamics of the Nordic power system

Saarinen, Linn; Norrlund, Per; Lundin, Urban; Agneholm, Evert et al.

2016

• DOI för Full-scale test and modelling of the frequency control dynamics of the Nordic power system

Examples of Benefits from Efficiency Evaluation Using Comparative Tests

Dahlbäck, Niklas; Norrlund, Per

Ingår i 10th International Conference on Hydraulic Efficiency Measurements 2014-09-16 - 19, Itajubá, Brazil, 2014

• Ladda ner fulltext (pdf) av Examples of Benefits from Efficiency Evaluation Using Comparative Tests

Accelerating the Computation of 3D Gradient Vector Flow Fields

Vidholm, Erik; Sundqvist, Per; Nyström, Ingela

Ingår i Proc, s. 677-680, 2006

• DOI för Accelerating the Computation of 3D Gradient Vector Flow Fields

Preconditioners and fundamental solutions

Sundqvist, Per

2003

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Navier-Stokes equations for low Mach number flows solved by boundary summation

Sundqvist, Per; Holmgren, Sverker

2005

Inertia estimation methods for hydropower units

Dahlborg, Elin; Norrlund, Per; Saarinen, Linn; Özcelikkale, Ayca et al.

Preconditioners Based on Fundamental Solutions

Brandén, Henrik; Sundqvist, Per

2005

• Ladda ner fulltext (ps) av Preconditioners Based on Fundamental Solutions

Boundary Summation Equations

Sundqvist, Per

2004

• Ladda ner fulltext (pdf) av Boundary Summation Equations

An Algorithm for Computing Fundamental Solutions of Difference Operators

Brandén, Henrik; Sundqvist, Per

2003

• Ladda ner fulltext (pdf) av An Algorithm for Computing Fundamental Solutions of Difference Operators

Discrete Fundamental Solution Preconditioning for Hyperbolic Systems of PDE

Brandén, Henrik; Holmgren, Sverker; Sundqvist, Per

2003

• Ladda ner fulltext (pdf) av Discrete Fundamental Solution Preconditioning for Hyperbolic Systems of PDE