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University of Manchester

1. Mat Zali, Samila Binti. Equivalent dynamic model of distribution network with distributed generation.

Degree: PhD, 2012, University of Manchester

Today’s power systems are based on a centralised system and distribution networks that are considered as passive terminations of transmission networks. The high penetration of Distributed Generation (DG) at the distribution network level has created many challenges for this structure. New tools and simulation approaches are required to address the subject and to quantify the dynamic characteristics of the system. A distribution network or part of it with DG, Active Distribution Network Cell (ADNC), can no longer be considered as passive. An equivalent dynamic model of ADNC is therefore extremely important, as it enables power system operators to quickly estimate the impact of disturbances on the power system’s dynamic behaviour. A dynamic equivalent model works by reducing both the complexity of the distribution network and the computation time required to run a full dynamic simulation. It offers a simple and low-order representation of the system without compromising distribution network dynamic characteristics and behaviour as seen by the external grid. This research aims to develop a dynamic equivalent model for ADNC. It focuses on the development of an equivalent model by exploiting system identification theory, i.e. the grey-box approach. The first part of the thesis gives a comprehensive overview and background of the dynamic equivalent techniques for power systems. The research was inspired by previous work on system identification theory. It further demonstrates the theoretical concept of system identification, system load modelling and the modelling of major types of DG. An equivalent model is developed, guided by the assumed structure of the system. The problem of equivalent model development is then formulated under a system identification framework, and the parameter estimation methodology is proposed. The validation results of the effectiveness and accuracy of the developed model are presented. This includes the estimation of the parameter model using a clustering algorithm to improve the computational performance and the analysis of transformer impedance effects on the ADNC responses. The evaluation of probability density function, eigenvalue analysis and parameter sensitivity analysis for the model parameters are also presented. Typical model parameters for different network topologies and configurations are identified. Finally, the developed equivalent model is used for a large power system application. The accuracy and robustness of the developed equivalent model are demonstrated under small and large disturbance studies for various types of fault and different fault locations.

Subjects/Keywords: 621.3121; dynamic equivalent; distributed generation; grey-box model; active distribution network cel; nonlinear least square optimisation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Mat Zali, S. B. (2012). Equivalent dynamic model of distribution network with distributed generation. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/equivalent-dynamic-model-of-distribution-network-with-distributed-generation(f4dc9bba-ed4a-4c74-a727-735f3addb6b2).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.554158

Chicago Manual of Style (16th Edition):

Mat Zali, Samila Binti. “Equivalent dynamic model of distribution network with distributed generation.” 2012. Doctoral Dissertation, University of Manchester. Accessed September 25, 2020. https://www.research.manchester.ac.uk/portal/en/theses/equivalent-dynamic-model-of-distribution-network-with-distributed-generation(f4dc9bba-ed4a-4c74-a727-735f3addb6b2).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.554158.

MLA Handbook (7th Edition):

Mat Zali, Samila Binti. “Equivalent dynamic model of distribution network with distributed generation.” 2012. Web. 25 Sep 2020.

Vancouver:

Mat Zali SB. Equivalent dynamic model of distribution network with distributed generation. [Internet] [Doctoral dissertation]. University of Manchester; 2012. [cited 2020 Sep 25]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/equivalent-dynamic-model-of-distribution-network-with-distributed-generation(f4dc9bba-ed4a-4c74-a727-735f3addb6b2).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.554158.

Council of Science Editors:

Mat Zali SB. Equivalent dynamic model of distribution network with distributed generation. [Doctoral Dissertation]. University of Manchester; 2012. Available from: https://www.research.manchester.ac.uk/portal/en/theses/equivalent-dynamic-model-of-distribution-network-with-distributed-generation(f4dc9bba-ed4a-4c74-a727-735f3addb6b2).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.554158

2. Mat Zali, Samila Binti. EQUIVALENT DYNAMIC MODEL OF DISTRIBUTION NETWORK WITH DISTRIBUTED GENERATION.

Degree: 2012, University of Manchester

Today’s power systems are based on a centralised system and distribution networks that are considered as passive terminations of transmission networks. The high penetration of Distributed Generation (DG) at the distribution network level has created many challenges for this structure. New tools and simulation approaches are required to address the subject and to quantify the dynamic characteristics of the system. A distribution network or part of it with DG, Active Distribution Network Cell (ADNC), can no longer be considered as passive. An equivalent dynamic model of ADNC is therefore extremely important, as it enables power system operators to quickly estimate the impact of disturbances on the power system’s dynamic behaviour. A dynamic equivalent model works by reducing both the complexity of the distribution network and the computation time required to run a full dynamic simulation. It offers a simple and low-order representation of the system without compromising distribution network dynamic characteristics and behaviour as seen by the external grid. This research aims to develop a dynamic equivalent model for ADNC. It focuses on the development of an equivalent model by exploiting system identification theory, i.e. the grey-box approach. The first part of the thesis gives a comprehensive overview and background of the dynamic equivalent techniques for power systems. The research was inspired by previous work on system identification theory. It further demonstrates the theoretical concept of system identification, system load modelling and the modelling of major types of DG. An equivalent model is developed, guided by the assumed structure of the system. The problem of equivalent model development is then formulated under a system identification framework, and the parameter estimation methodology is proposed. The validation results of the effectiveness and accuracy of the developed model are presented. This includes the estimation of the parameter model using a clustering algorithm to improve the computational performance and the analysis of transformer impedance effects on the ADNC responses. The evaluation of probability density function, eigenvalue analysis and parameter sensitivity analysis for the model parameters are also presented. Typical model parameters for different network topologies and configurations are identified. Finally, the developed equivalent model is used for a large power system application. The accuracy and robustness of the developed equivalent model are demonstrated under small and large disturbance studies for various types of fault and different fault locations.

None

None

Advisors/Committee Members: Milanovic, Jovica.

Subjects/Keywords: dynamic equivalent; distributed generation; grey-box model; active distribution network cel; nonlinear least square optimisation

…line) and grey-box model for the case T5 F1(dashed line)… …grey-box model for the case P F5 (dashed line)… …186 Figure 6-5: Developed grey-box model in Simulink format… …equivalent model by exploiting system identification theory, i.e. the grey-box approach. The first… …black box and grey box modelling. In [64], a black box modelling approach based on… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Mat Zali, S. B. (2012). EQUIVALENT DYNAMIC MODEL OF DISTRIBUTION NETWORK WITH DISTRIBUTED GENERATION. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:161833

Chicago Manual of Style (16th Edition):

Mat Zali, Samila Binti. “EQUIVALENT DYNAMIC MODEL OF DISTRIBUTION NETWORK WITH DISTRIBUTED GENERATION.” 2012. Doctoral Dissertation, University of Manchester. Accessed September 25, 2020. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:161833.

MLA Handbook (7th Edition):

Mat Zali, Samila Binti. “EQUIVALENT DYNAMIC MODEL OF DISTRIBUTION NETWORK WITH DISTRIBUTED GENERATION.” 2012. Web. 25 Sep 2020.

Vancouver:

Mat Zali SB. EQUIVALENT DYNAMIC MODEL OF DISTRIBUTION NETWORK WITH DISTRIBUTED GENERATION. [Internet] [Doctoral dissertation]. University of Manchester; 2012. [cited 2020 Sep 25]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:161833.

Council of Science Editors:

Mat Zali SB. EQUIVALENT DYNAMIC MODEL OF DISTRIBUTION NETWORK WITH DISTRIBUTED GENERATION. [Doctoral Dissertation]. University of Manchester; 2012. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:161833


Linköping University

3. Boberg, Frida. Simulation of dynamic and static behavior of an electrically powered lift gate.

Degree: Electrical Engineering, 2008, Linköping University

Continental Automotive Systems is a German company that develops control systems for different applications in cars. A control system for electrically powered lift gates that are opened or closed on the driver’s command is one of the products developed. The drive system itself is composed of a spindle that is driven by a DC-motor over a gear and a spring. When developing the control system it is convenient to use a simulation model instead of having to implement it on the system every time. The simulation analytically describes how the system is behaving. In this thesis a simulation model of a drive system and a lift gate is developed and evaluated. The model parameters are estimated using System Identification Toolbox in Matlab.

Continental Automotive Systems är ett tyskt företag som utvecklar styrsystem för olika tillämpningar i bilar. Bland annat utvecklas ett styrsystem till eldrivna bakluckor som öppnas och stängs av föraren per knapptryck. Själva drivanordningen består av en skruv som drivs av en likströmsmotor över en utväxling och en fjäder. Då man vill utveckla styrsystemet utan att behöva implementera det på systemet varje gång är en simuleringsmodell av drivanordningen och luckan ett bra hjälpmedel. Denna simuleringsmodell kan då analytiskt beräkna hur systemet uppför sig. I detta examensarbete har en simuleringsmodell av en drivanordning med tillhörande lucka utvecklats och utvärderats. Modellparametrarna estimerades med hjälp av System Identification Toolbox i Matlab.

Subjects/Keywords: simulation; modeling; DC-motor; nonlinear gray box; parameter estimation; Matlab; Simulink; System Identification Toolbox; Automatic control; Reglerteknik

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Boberg, F. (2008). Simulation of dynamic and static behavior of an electrically powered lift gate. (Thesis). Linköping University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11627

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Boberg, Frida. “Simulation of dynamic and static behavior of an electrically powered lift gate.” 2008. Thesis, Linköping University. Accessed September 25, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11627.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Boberg, Frida. “Simulation of dynamic and static behavior of an electrically powered lift gate.” 2008. Web. 25 Sep 2020.

Vancouver:

Boberg F. Simulation of dynamic and static behavior of an electrically powered lift gate. [Internet] [Thesis]. Linköping University; 2008. [cited 2020 Sep 25]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11627.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Boberg F. Simulation of dynamic and static behavior of an electrically powered lift gate. [Thesis]. Linköping University; 2008. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11627

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.