A Nonlinear Model and Steady State Analysis of A Unified Power Flow Controller

As the latest generation of flexible AC transmission system (FACTS) devices, the unified power flow controller (UPFC) has comprehensive control capability and has played an important role in modern power systems. Research on UPFC steady-state power flow regulation capability is valuable for the design and operation of UPFC projects. To analyze the UPFC regulation capability, in this paper, the interaction between the UPFC and the external system is studied and the key factors of UPFC regulation capability are analyzed. It is demonstrated that the changes in the voltage magnitude and phase angle difference of UPFC-embedded line terminals will hinder the UPFC from regulating the power flow and decrease the UPFC regulation capability. Therefore, the UPFC power flow regulation capability is not only related to the parameters of the UPFC and its installation line, but also related to grid parameters. To analyze the UPFC active power flow regulation capability in practical power grids, the relationship between the UPFC regulation capability and grid parameters is deduced, and an estimation method is proposed to calculate the regulation range. Then, the estimation method is applied in the Chuxiong Power Grid and compared with power flow calculations. The results verify the UPFC power flow regulation characteristics given by the analysis and the effectiveness of the estimation method. Besides, it is shown that the estimation method can lower the requirements for the power flow calculation program, and reduce computation load.

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Power-Flow Model and Steady-State Analysis of the Hybrid Flow Controller

IEEE Transactions on Power Delivery ◽

10.1109/tpwrs.2008.923815 ◽

2008 ◽

Vol 23 (4) ◽

pp. 2330-2338 ◽

Cited By ~ 16

Author(s):

S.A.N. Niaki ◽

R. Iravani ◽

M. Noroozian

Keyword(s):

Steady State ◽

Power Flow ◽

Flow Model ◽

Steady State Analysis ◽

Flow Controller ◽

State Analysis

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Application of Unified Power Flow Controller to Improve Steady State Voltage Limit

IAES International Journal of Robotics and Automation (IJRA) ◽

10.11591/ijra.v6i4.pp277-285 ◽

2017 ◽

Vol 6 (4) ◽

pp. 277

Author(s):

Samina. E. Mubeen ◽

Baseem Khan ◽

R. K. Nema

Keyword(s):

Steady State ◽

Power System ◽

Power Flow ◽

Load Flow ◽

Electric Power System ◽

Voltage Source ◽

Unified Power Flow Controller ◽

Analytical Methodology ◽

Flow Controller ◽

Power Flow Controller

<span>This paper utilizes the voltage source model of Unified Power Flow Controller (UPFC) and examines its abilities in mitigating the steady state stability margins of electric power system. It analyzes its behavior for different controls strategies and proposes the most efficient mode of controlling the controller for voltage stability enhancement. A systematic analytical methodology based on the concept of modal analysis of the modified load flow equations is employed to identify the area in a power system which is most prone voltage instability. Also to identify the most effective point of placement for the UPFC, a computer program has been developed using MATLAB. The results of analysis on 14 bus system is presented here as a case study.</span>

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