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Transient stability enhancement with UPFC
IET-UK International Conference on Information and Communication Technology in Electrical Sciences (ICTES 2007), 2007In this paper, the most versatile FACTS device UPFC is modelled and implemented in the SMIB (single machine infinite bus) system and standard 9 - bus system (Anderson and Fouad, 1977). The performances of these systems are simulated by using MATLAB. It has been found that the critical clearing time of the system has increased after including the UPFC ...
N.M.J. Swaroopan, P. Somasundaram
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Passivity-based control of UPFCs
2009 International Conference on Power Electronics and Drive Systems (PEDS), 2009We explore the passivity-based control (PBC) for robust UPFC controller design. Under this framework, the dynamical model of UPFC will be represented by a Euler-Lagrangian (EL) system with a set of EL parameters. The energy-dissipative properties of system model are fully retained.
Chia-Chi Chu, Hung-Chi Tsai
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APSCOM 2000 - 5th International Conference on Advances in Power System Control, Operation and Management, 2000
An alternative control strategy of a UPFC, based on hysteresis control of the switches is presented. It is shown that a UPFC under hysteresis control will have nearly sinusoidal injected output current and voltage for reactive power and real power compensation while keeping the UPFC in its simplest configuration.
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An alternative control strategy of a UPFC, based on hysteresis control of the switches is presented. It is shown that a UPFC under hysteresis control will have nearly sinusoidal injected output current and voltage for reactive power and real power compensation while keeping the UPFC in its simplest configuration.
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Line congestion relief using UPFC
2013 International Conference on Power, Energy and Control (ICPEC), 2013Congestion is a growing problem in the modern power system, as systems are interconnected and are always operating near stability limit which results in rapid voltage drop due to heavy load demand. Unified Power Flow Controller (UPFC) is one of the latest generation Flexible AC Transmission System (FACTS) devices, which is able to control ...
S. Rai +4 more
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Multi-teriminal UPFC for power system deregulation
2000 IEEE Power Engineering Society Winter Meeting. Conference Proceedings (Cat. No.00CH37077), 2002One original purpose of FACTS controllers is to increase the transmission capacity of existing lines thus deferring the necessity of building new lines. FACTS, such as the unified power flow controller (UPFC), have also been regarded as controllers for routing power in the market-driven, deregulated power systems.
B. Mwinywiwa +6 more
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2007 IEEE Power Engineering Society General Meeting, 2007
Summary form only given. This paper presents a screening technique for greatly reducing the computation involved in determining the optimal location of a unified power flow controller (UPFC) in a power system. The first-order sensitivities of the generation cost with respect to UPFC control parameters are derived.
Seungwon An +2 more
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Summary form only given. This paper presents a screening technique for greatly reducing the computation involved in determining the optimal location of a unified power flow controller (UPFC) in a power system. The first-order sensitivities of the generation cost with respect to UPFC control parameters are derived.
Seungwon An +2 more
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UPFC operations under stressed system conditions
IEEE Power Engineering Society Summer Meeting,, 2003Power systems often work in stressed conditions nowadays. A unified power flow controller (UPFC) with its capability to regulate significant amounts of real and reactive power flow simultaneously and independently can, at its full capacity, exert effects on the system that are strong enough to be counted as transient events.
Wu, Xiaohe, Qu, Zhihua
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Stability-constrained operation for UPFC devices
2001 IEEE/PES Transmission and Distribution Conference and Exposition. Developing New Perspectives (Cat. No.01CH37294), 2002Improper operations of UPFC can make power system lose its synchronism. This paper explores the principle of this stability problem, and a simple system with single UPFC is set up to demonstrate the existence of such stability problems. An algorithm is proposed to determine whether a UPFC operation is stability constrained or not.
Wu, Xiaohe, Qu, Zhihua, Mohapatra, R. N.
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Multi-level controller design for UPFC
Proceedings. International Conference on Power System Technology, 2003This paper presents a two-level controller design for UPFC, i.e., internal level controller and external level controller. A switch is designed in the external level to determine the functional operation of UPFC. The external level controller is a conventional PI controller to provide the references signals for the internal level.
null Hua Xie +4 more
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Research of MMC-UPFC Control Strategy
2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia), 2019The unified power flow controller (UPFC) as the intelligent power grid energy controller is a more comprehensive flexible ac device that can improve power grid operation, transmission levels and power quality. The differences in UPFC topology and its control strategies have an important impact on its output characteristics.
Jianpo Zhang +3 more
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