Per Norrlund

Storage system optimization for enhancing frequency control from hydropower

Laban, Danilo; Norrlund, Per; Lundin, Urban

Part of Journal of Energy Storage, 2025

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Comparison of model performance and field data for hydro-battery hybrid systems providing frequency control

Laban, Danilo; Norrlund, Per; Lundin, Urban

Part of 8th International Hybrid Power Plants & Systems Workshop (HYB 2024), p. 47-52, 2024

• DOI for Comparison of model performance and field data for hydro-battery hybrid systems providing frequency control

Storage System Design for Improved Primary Frequency Control From Hydropower Units

Laban, Danilo; Norrlund, Per; Lundin, Urban

Part of IEEE transactions on energy conversion, p. 1836-1844, 2023

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

Electrical dump-loads increasing spill capacity

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

Part of Hydropower R&D days 2023., 2023

Kaplan turbine model validation for large grid frequency disturbances

Dahlborg, Elin; Norrlund, Per; Saarinen, Linn

Part of IEEE transactions on energy conversion, p. 611-618, 2021

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

Storage system optimization for enhancing frequency control from hydropower

Laban, Danilo; Norrlund, Per; Lundin, Urban

Part of Journal of Energy Storage, 2025

• DOI for 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

Part of IEEE transactions on energy conversion, p. 1836-1844, 2023

• DOI for 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

Part of IEEE transactions on energy conversion, p. 611-618, 2021

• DOI for 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.

Part of Nature Communications, 2018

• DOI for 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.

Part of Renewable energy, p. 1014-1025, 2018

• DOI for 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

Part of International Journal of Electrical Power & Energy Systems, p. 488-495, 2018

• DOI for 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.

Part of Applied Energy, p. 1138-1152, 2018

• DOI for 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

Part of IEEE Transactions on Power Systems, p. 430-439, 2018

• DOI for 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.

Part of IEEE Transactions on Power Systems, p. 1191-1201, 2017

• DOI for 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.

Part of Renewable energy, p. 88-95, 2016

• DOI for 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

Part of International Journal of Electrical Power & Energy Systems, p. 16-24, 2016

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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.

Part of Energies, p. 10260-10275, 2015

• DOI for 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

Part of IEEE transactions on energy conversion, p. 1061-1068, 2015

• DOI for 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

Part of Electric power components and systems, p. 1707-1716, 2015

• DOI for 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

Part of IEEE Transactions on Power Systems, p. 3826-3833, 2013

• DOI for 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

Part of Journal of Computational and Applied Mathematics, p. 518-536, 2008

• DOI for 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

Part of Journal of Scientific Computing, p. 35-60, 2007

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

Can one hear the composition of a drum?

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

Part of Mediterranean Journal of Mathematics, p. 227-249, 2006

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

Preconditioners based on fundamental solutions

Brandén, Henrik; Sundqvist, Per

Part of BIT Numerical Mathematics, p. 481-494, 2005

• DOI for Preconditioners based on fundamental solutions

An algorithm for computing fundamental solutions of difference operators

Brandén, Henrik; Sundqvist, Per

Part of Numerical Algorithms, p. 331-343, 2004

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

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

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

Part of Modeling and Dynamic Behaviour of Hydropower Plants, Institution of Engineering and Technology, 2017

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

Numerical Computations with Fundamental Solutions

Sundqvist, Per

2005

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Preconditioners and fundamental solutions

Sundqvist, Per

2003

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Comparison of model performance and field data for hydro-battery hybrid systems providing frequency control

Laban, Danilo; Norrlund, Per; Lundin, Urban

Part of 8th International Hybrid Power Plants & Systems Workshop (HYB 2024), p. 47-52, 2024

• DOI for Comparison of model performance and field data for hydro-battery hybrid systems providing frequency control

Electrical dump-loads increasing spill capacity

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

Part of Hydropower R&D days 2023., 2023

Improving frequency control from Kaplan turbines to fulfill grid codes

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

Part of HYDRO 2019, Porto, Portugal, 14-16 October, 2019., 2019

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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.

2016

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

Analysis on regulation strategies for extending service life of hydropower turbines

Yang, Weijia; Norrlund, Per; Yang, Jiandong

2016

• DOI for 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.

Part of 2016 IEEE POWER AND ENERGY SOCIETY GENERAL MEETING (PESGM), 2016

• DOI for 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

Examples of Benefits from Efficiency Evaluation Using Comparative Tests

Dahlbäck, Niklas; Norrlund, Per

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

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Accelerating the Computation of 3D Gradient Vector Flow Fields

Vidholm, Erik; Sundqvist, Per; Nyström, Ingela

Part of Proc, p. 677-680, 2006

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

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.

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

Contribution of Empirical Fast Frequency Control Schemes to Nordic Power System Stability

Laban, Danilo; Albuquerque, Vinícius M.; Saarinen, Linn; Ekestam, Henrik et al.

Experimental Comparison of Frequency Derivative Estimation for Synthetic Inertia

Laban, Danilo; Albuquerque, Vinícius M.; Norrlund, Per; Lundin, Urban

Preconditioners Based on Fundamental Solutions

Brandén, Henrik; Sundqvist, Per

2005

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Boundary Summation Equations

Sundqvist, Per

2004

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An Algorithm for Computing Fundamental Solutions of Difference Operators

Brandén, Henrik; Sundqvist, Per

2003

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Discrete Fundamental Solution Preconditioning for Hyperbolic Systems of PDE

Brandén, Henrik; Holmgren, Sverker; Sundqvist, Per

2003

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