An adaptive D-STATCOM control scheme utilising impedance estimation

Rose, Christopher James (2016) An adaptive D-STATCOM control scheme utilising impedance estimation. PhD thesis, University of Nottingham.

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Concerns for energy security and the environment are driving significant changes in the way electrical power is generated and distributed. In many parts of the world, electrical power systems are gradually changing from centralised systems with a small number of large generators and substations performing most control operations to distributed systems, with a large number of devices providing control at a local level. Power electronic converters have an increasingly important role to play in modern electrical power systems. One example of power electronics in such systems is the STATCOM, a power electronic device which can be used to provide an efficient and effective means of controlling power system voltages. This thesis presents an investigation into STATCOM voltage control for distribution level power networks.

In this work, a STATCOM voltage control structure is proposed and an impedance estimation algorithm is used to tune the controller gains in order to achieve the desired dynamic performance. This work demonstrates that the use of impedance estimation for controller tuning allows the STATCOM dynamics to remain consistent when installed on different systems or if the system impedance should change. In addition to proposing the voltage control structure, this thesis also proposes improvements to an earlier impedance estimation method, taking into account changes in converter structures and control methods since the method was first proposed.

Item Type: Thesis (University of Nottingham only) (PhD)
Supervisors: Sumner, Mark
Thomas, D.W.P.
Christopher, Edward
Keywords: STATCOM, impedance estimation, voltage control, electrical distribution, power networks, voltage stability
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Faculties/Schools: UK Campuses > Faculty of Engineering
Item ID: 32915
Depositing User: Rose, Christopher
Date Deposited: 21 Jul 2016 12:02
Last Modified: 21 Sep 2016 16:45

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