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Coordinated Control of VSC Based Multi-Terminal DC (VSC-MTDC) Power Grid

Huang, Shimeng (2015) Coordinated Control of VSC Based Multi-Terminal DC (VSC-MTDC) Power Grid. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Voltage source converter based multi-terminal DC (VSC-MTDC) system has raised great interest in academia and power industry. The maturing VSC technology has made such
system possible for future medium and high voltage applications. Inspired by the success of DC based power distribution on electric ships, a number of VSC-MTDC systems have been proposed in literature for power grid innovation. However, there are still major technology
obstacles to overcome before a VSC-MTDC grid come to utilization. Compared to the maturing technology on device level, research is still needed on the system and operation level. High dynamics and controllability of the VSC brings both opportunity and risks. Controllers must be carefully designed on grid level to fulfill multiple control objectives and coordinate local converter actions.

This work provides a comprehensive solution for MTDC system from modeling to control design. The procedure and tool sets are designed to be applied to various system setups and control schemes, so that it can be applied to multiple MTDC applications. First, thorough study on the VSC-MTDC system is conducted through analytical modeling and simulation. A systematic modeling method for general VSC-MTDC system is proposed. It contains a two-stage procedure that is generalizable to arbitrary system setup and configuration. A small signal state space representation which includes local and network dynamics can be obtained. A novel reconfigurable controller concept is then proposed to address multiple control strategies and communication constraints in system level. Design of such controller is formulated into a standard LMI optimization problem so it can be efficiently solved even for large scale system. Using the proposed control design method, different control schemes can be easily explored through unified methodology and procedure. We demonstrated that existing control schemes for MTDC power balancing can be covered by this control structure.

The proposed modeling and control design method is applied to four-terminal HVDC systems of multiple grid applications. Different control topologies and operation modes are evaluated and compared. Practical aspects such as LMI parameter tuning guideline and specifications for different applications are discussed.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Huang, Shimengshh61@pitt.eduSHH61
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairMao, Zhi-Hongzhm4@pitt.eduZHM4
Committee CoChairReed, Gregorygfr3@pitt.eduGFR3
Committee MemberSun, Mingui
Committee MemberStanchina, William
Committee MemberMcDermott, Thomastem42@pitt.eduTEM42
Committee MemberLi, Ching-Chung
Date: 11 September 2015
Date Type: Publication
Defense Date: 8 July 2015
Approval Date: 11 September 2015
Submission Date: 27 July 2015
Access Restriction: 2 year -- Restrict access to University of Pittsburgh for a period of 2 years.
Number of Pages: 105
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Electrical Engineering
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: multi-terminal DC, voltage source converter, power systems, control, linear matrix inequality, state feedback control
Date Deposited: 11 Sep 2015 17:17
Last Modified: 11 Sep 2017 05:15


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