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On the Dynamics and Statics of Power System Operation: Optimal Utilization of FACTS Devicesand Management of Wind Power Uncertainty
KTH, School of Electrical Engineering (EES), Electric Power Systems.
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Nowadays, power systems are dealing with some new challenges raisedby the major changes that have been taken place since 80’s, e.g., deregu-lation in electricity markets, significant increase of electricity demands andmore recently large-scale integration of renewable energy resources such aswind power. Therefore, system operators must make some adjustments toaccommodate these changes into the future of power systems.One of the main challenges is maintaining the system stability since theextra stress caused by the above changes reduces the stability margin, andmay lead to rise of many undesirable phenomena. The other important chal-lenge is to cope with uncertainty and variability of renewable energy sourceswhich make power systems to become more stochastic in nature, and lesscontrollable.Flexible AC Transmission Systems (FACTS) have emerged as a solutionto help power systems with these new challenges. This thesis aims to ap-propriately utilize such devices in order to increase the transmission capacityand flexibility, improve the dynamic behavior of power systems and integratemore renewable energy into the system. To this end, the most appropriatelocations and settings of these controllable devices need to be determined.This thesis mainly looks at (i) rotor angle stability, i.e., small signal andtransient stability (ii) system operation under wind uncertainty. In the firstpart of this thesis, trajectory sensitivity analysis is used to determine themost suitable placement of FACTS devices for improving rotor angle sta-bility, while in the second part, optimal settings of such devices are foundto maximize the level of wind power integration. As a general conclusion,it was demonstrated that FACTS devices, installed in proper locations andtuned appropriately, are effective means to enhance the system stability andto handle wind uncertainty.The last objective of this thesis work is to propose an efficient solutionapproach based on Benders’ decomposition to solve a network-constrained acunit commitment problem in a wind-integrated power system. The numericalresults show validity, accuracy and efficiency of the proposed approach.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. , 68 p.
Series
TRITA-EE, ISSN 1653-5146 ; 2014:048
Keyword [en]
Trajectory sensitivity analysis (TSA), transient stability, small signal stability, flexible AC transmission system (FACTS) devices, critical clearing time (CCT), optimal power flow (OPF), network-constrained ac unit commitment (ac-UC), wind power uncertainty, wind power spillage, stochastic programming, Benders’ decomposition
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-154576ISBN: 978-91-7595-302-1 (print)OAI: oai:DiVA.org:kth-154576DiVA: diva2:757924
Public defence
2014-11-13, H1, Teknikringen 33, KTH, Stockholm, 14:00 (English)
Opponent
Supervisors
Note

The Doctoral Degrees issued upon completion of the programme are issued by Comillas Pontifical University, Delft University of Technology and KTH Royal Institute of Technology. The invested degrees are official in Spain, the Netherlands and Sweden, respectively.QC 20141028

Available from: 2014-10-28 Created: 2014-10-23 Last updated: 2014-10-28Bibliographically approved
List of papers
1. Using trajectory sensitivity analysis to find suitable locations of series compensators for improving rotor angle stability
Open this publication in new window or tab >>Using trajectory sensitivity analysis to find suitable locations of series compensators for improving rotor angle stability
2014 (English)In: Electric power systems research, ISSN 0378-7796, E-ISSN 1873-2046, Vol. 111, 1-8 p.Article in journal (Refereed) Published
Abstract [en]

This paper proposes an approach based on trajectory sensitivity analysis (TSA) to find most suitable placement of series compensators in the power system. The main objective is to maximize the benefit of these devices in order to enhance the rotor angle stability. This approach is formulated as a two-stage problem, whose first-stage describes prior to fault occurrence and whose second-stage represents the power system behavior involving a set of severe faults. The first-stage focuses on small signal stability, while the second-stage deals with transient stability of power system. In this vein, the trajectory sensitivities of the rotor angles of generators with respect to the reactances of transmission lines are calculated. Two equivalent rotor angles are introduced to find stability indices corresponding to the first- and the second-stage of the proposed approach. Numerical results from IEEE 10-machine 39-bus test system demonstrate the usefulness of the proposed method.

Keyword
Trajectory sensitivity analysis (TSA), Transient stability, Small signal stability, Flexible AC transmission system (FACTS) devices, Critical clearing time (CCT)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-141262 (URN)10.1016/j.epsr.2014.01.022 (DOI)000335873800001 ()2-s2.0-84894588509 (Scopus ID)
Note

QC 20140612

Available from: 2014-02-12 Created: 2014-02-12 Last updated: 2017-12-06Bibliographically approved
2. Minimizing Wind Power Spillage Using an OPF With FACTS Devices
Open this publication in new window or tab >>Minimizing Wind Power Spillage Using an OPF With FACTS Devices
2014 (English)In: IEEE Transactions on Power Systems, ISSN 0885-8950, E-ISSN 1558-0679, Vol. 29, no 5, 2150-2159 p.Article in journal (Refereed) Published
Abstract [en]

This paper proposes an optimal power flow (OPF) model with flexible AC transmission system (FACTS) devices to minimize wind power spillage. The uncertain wind power production is modeled through a set of scenarios. Once the balancing market is cleared, and the final values of active power productions and consumptions are assigned, the proposed model is used by the system operator to determine optimal reactive power outputs of generating units, voltage magnitude and angles of buses, deployed reserves, and optimal setting of FACTS devices. This system operator tool is formulated as a two-stage stochastic programming model, whose first-stage describes decisions prior to uncertainty realization, and whose second-stage represents the operating conditions involving wind scenarios. Numerical results from a case study based on the IEEE RTS demonstrate the usefulness of the proposed tool.

Place, publisher, year, edition, pages
IEEE Press, 2014
Keyword
FACTS devices, optimal power flow (OPF), stochastic programming, thyristor controlled series capacitor (TCSC), wind power spillage
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering; Energy Technology
Identifiers
urn:nbn:se:kth:diva-141261 (URN)10.1109/TPWRS.2014.2299533 (DOI)000341190700016 ()2-s2.0-84906489255 (Scopus ID)
Note

QC 20140925

Available from: 2014-02-12 Created: 2014-02-12 Last updated: 2017-12-06Bibliographically approved
3. Network-constrained AC Unit Commitment under Uncertainty: A Benders’ Decomposition Approach
Open this publication in new window or tab >>Network-constrained AC Unit Commitment under Uncertainty: A Benders’ Decomposition Approach
(English)Manuscript (preprint) (Other academic)
Abstract [en]

This paper proposes an efficient solution approachbased on Benders’ decomposition to solve a network-constrainedac unit commitment problem under uncertainty. The wind powerproduction is the only source of uncertainty considered in thispaper, which is modeled through a suitable set of scenarios.The proposed model is formulated as a two-stage stochasticprogramming problem, whose first-stage refers to the day-aheadmarket, and whose second-stage represents real-time operation.The proposed Benders’ approach allows decomposing the originalproblem, which is mixed-integer non-linear and generallyintractable, into a mixed-integer linear master problem and aset of non-linear, but continuous subproblems, one per scenario.In addition, to temporally decompose the proposed ac unitcommitment problem, a heuristic technique is used to relaxthe inter-temporal ramping constraints of the generating units.Numerical results from a case study based on the IEEE one-areareliability test system (RTS) demonstrate the usefulness of theproposed approach.

Keyword
Network-constrained ac unit commitment, Wind power uncertainty, Stochastic programming, Benders’ decomposition
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-154575 (URN)
Note

QS 2014

Available from: 2014-10-23 Created: 2014-10-23 Last updated: 2014-10-29Bibliographically approved
4. Multi-parameter trajectory sensitivity approach to analyze the impacts of wind powerpenetration on power system transient stability
Open this publication in new window or tab >>Multi-parameter trajectory sensitivity approach to analyze the impacts of wind powerpenetration on power system transient stability
2014 (English)In: CIGRE, AORC Technical meeting 2014, 2014, 7- p.Conference paper, Published paper (Refereed)
Abstract [en]

In the most real-world power systems, the share of wind power penetration in total installed generationcapacity is rapidly increasing. This large-scale integration of wind power into an electric power systemposes challenges to the power system operators and planners. One of the main challenges is tomaintain sufficient margins for transient stability. High penetration of wind power causes reduction ofthe total kinetic energy stored in through rotating masses since wind generators are decoupled from thegrid by power electronic converters, and therefore, cannot contribute to the inertia of the grid. Theresulting reduction of grid inertia may cause higher risk of transient instability. In this paper, trajectorysensitivity analysis (TSA) technique is used to determine the impacts of decreasing inertia of differentgenerating units on the transient stability of power system. Numerical results from IEEE 10-machine39-bus test system demonstrate the usefulness of the proposed approach.

Keyword
Trajectory Sensitivity Analysis (TSA), Transient Stability, Inertia, Wind Power Generation, Critical Clearing Time (CCT)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-154574 (URN)
Conference
CIGRE, AORC Technical meeting 2014
Note

QC 20141029

Available from: 2014-10-23 Created: 2014-10-23 Last updated: 2014-10-29Bibliographically approved
5. Suitable placements of multiple FACTS devices to improve the transient stability using trajectory sensitivity analysis
Open this publication in new window or tab >>Suitable placements of multiple FACTS devices to improve the transient stability using trajectory sensitivity analysis
2013 (English)In: North American Power Symposium (NAPS), 2013, IEEE conference proceedings, 2013, 1-6 p.Conference paper, Published paper (Refereed)
Abstract [en]

Trajectory sensitivity analysis (TSA) is used as a tool for suitable placement of multiple series compensators in the power system. The goal is to maximize the benefit of these devices in order to enhance the transient stability of the system. For this purpose, the trajectory sensitivities of the rotor angles of the most critical generators with respect to the reactances of transmission lines are calculated in the presence of the most severe faults. Based on the obtained trajectory sensitivities, a method is proposed to determine how effective the series compensation of each transmission line is for improving the transient stability. This method is applied to the Nordic-32 test system to find the priorities of the transmission lines for installation of several series compensators. Simulation with industrial software shows the validity and efficiency of the proposed method.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2013
Series
North American Power Symposium, ISSN 2163-4939
Keyword
Critical generators, Facts devices, Industrial software, Series compensation, Series compensator, Test systems, Trajectory sensitivity, Trajectory sensitivity analysis
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-139540 (URN)10.1109/NAPS.2013.6666828 (DOI)000332902200005 ()2-s2.0-84893322114 (Scopus ID)978-147991255-1 (ISBN)
Conference
45th North American Power Symposium, NAPS 2013; Manhattan, KS; United States; 22 September 2013 through 24 September 2013
Note

QC 20140123

Available from: 2014-01-14 Created: 2014-01-14 Last updated: 2014-10-28Bibliographically approved
6. Transient stability assessment of power systems in the presence of shunt compensators using trajectory sensitivity analysis
Open this publication in new window or tab >>Transient stability assessment of power systems in the presence of shunt compensators using trajectory sensitivity analysis
2013 (English)In: 2013 IEEE Power and Energy Society General Meeting (PES), IEEE , 2013, 6672163- p.Conference paper, Published paper (Refereed)
Abstract [en]

Trajectory sensitivity analysis (TSA) is used as analysis tool for suitable placement of shunt compensators in the power system. The goal is to maximize the benefit of these devices in order to enhance the transient stability of the system. For this purpose, the trajectory sensitivities of the rotor angles of generators with respect to the reactive power injected into different nodes of the system are calculated in the presence of most probable severe faults. Based on the obtained trajectory sensitivities, a method is proposed to determine how effective the shunt compensation in each node is for improving the transient stability. This method is applied to the IEEE 3-machine 9-bus to find the priorities of system's nodes for installation of shunt compensators. Simulation with industrial software shows the validity and efficiency of the proposed method.

Place, publisher, year, edition, pages
IEEE, 2013
Series
IEEE Power and Energy Society General Meeting, ISSN 1944-9925
Keyword
Critical Clearing Time (CCT), Static Synchronous Compensator (STATCOM), Trajectory Sensitivity Analysis (TSA), Transient Stability
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-139541 (URN)10.1109/PESMG.2013.6672163 (DOI)000331874300085 ()2-s2.0-84893192628 (Scopus ID)978-147991303-9 (ISBN)
Conference
2013 IEEE Power and Energy Society General Meeting, PES 2013; Vancouver, BC; Canada; 21 July 2013 through 25 July 2013
Note

QC 20140319

Available from: 2014-01-14 Created: 2014-01-14 Last updated: 2014-10-28Bibliographically approved
7. Appropriate placement of series compensators to improve transient stability of power system
Open this publication in new window or tab >>Appropriate placement of series compensators to improve transient stability of power system
2012 (English)In: Innovative Smart Grid Technologies-Asia (ISGT Asia), 2012 IEEE, IEEE conference proceedings, 2012, 1-6 p.Conference paper, Published paper (Refereed)
Abstract [en]

Trajectory sensitivity analysis is used to find the best places for installation of thyristor controlled series capacitors (TCSC) to improve transient stability of the power system. Based on the rotor angles of generators, an equivalent angle (δeq) is defined by determining accelerating and decelerating machines, and then using trajectory sensitivities of this angle with respect to the impedances of the transmission lines in the post-fault system, appropriate locations for placing TCSC will be found. Severity of the faults is also considered in this calculation. This method is applied to the IEEE 3-machine 9-bus test system to find the priorities of the transmission lines for installation of TCSC. Simulation with industrial software verifies the obtained results.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2012
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-109739 (URN)10.1109/ISGT-Asia.2012.6303243 (DOI)2-s2.0-84868568555 (Scopus ID)978-1-4673-1221-9 (ISBN)
Conference
Innovative Smart Grid Technologies-Asia (ISGT Asia),21-24 May 2012, Tianjin
Funder
EU, European Research Council
Note

QC 20130109

Available from: 2013-01-09 Created: 2013-01-08 Last updated: 2014-10-28Bibliographically approved

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