Optimal unified power flow controller application to enhance total transfer capability

Abstract

For a power transfer path, total transfer capability (TTC) represents maximum power that can be transferred over the transmission system. Unified power flow controller (UPFC) is a device that can be used to increase in TTC. This study presents a new method for optimal UPFC application to minimise power loss while enhancing TTC. Based on UPFC injection model, the solution region of UPFC parameters is first found using the proposed method to maximise TTC. It then searches the solution region to find optimal UPFC control mode and setting to minimise system power loss. The proposed method is applied to the IEEE-Reliability Test System and the UPFC application impact are evaluated. Comparative studies are conducted between the TTC results obtained by the proposed method with those obtained using the existing approaches.Nomenclature P PI , P SI active power of parallel and series inverters Q PI , Q SI reactive power of parallel and series inverters P P , Q P active and reactive power injection at PB P PB , P SB active power at PB and SB buses Q PB , Q SB reactive power at PB and SB buses V d UPFC series injected voltage with magnitude and phase angle V d of and θ d V PB PB bus voltage with magnitude and phase angle of V PB and θ PB V SB SB bus voltage with magnitude and phase angle of V SB and θ SB V PI voltage of parallel inverter with magnitude and phase angle of V PI and θ PI V SI voltage of series inverter with magnitude and phase angle of V SI and θ SI I SI , I PI current of the series and parallel inverter I PB , I SB current of PB and SB X PT , X ST reactance of parallel and series transformers V Max I maximum output voltage of the inverters I Max I maximum output current of the inverters S Max

Enhanced Microgrid Dynamic Performance Using a Modulated Power Filter Based on Enhanced Bacterial Foraging Optimization

“…The next loop will be used to track the load current dynamic deviations for compensating any occasional changing in the load or the operating condition. The last loop will be used to track the current harmonics to minimize the harmonic component [15,16]. The global computed dynamic error is fed to the PI controller.…”

Preventive Security-Constrained Optimal Power Flow Considering UPFC Control Modes

“…Many researchers have studied the optimal application of UPFC in a power system network using optimization techniques to improve voltage stability, enhance total transfer capability, and reduce active power loss and system operating costs [5][6][7][8][9]. In Reference [5], a bat search algorithm was used to achieve the optimal power flow for generation reallocation with UPFC.…”

“…A method to determine the location of UPFC for congestion management was implemented in Reference [6]. Taking UPFC control mode into consideration, a method for optimal UPFC application to minimize power loss while enhancing total transfer capability is proposed in Reference [7]. A Gravitational Search Algorithm (GSA) was applied to solve the optimal power flow problem in the presence of multiple UPFC devices in Reference [8].…”

Security-constrained line loss minimization in distribution systems with high penetration of renewable energy using UPFC

“…On the contrary, optimal power flow (OPF) based calculations are able to make the operation more optimized and flexible with multi-objectives considered and multiparameters optimized. OPF algorithms have been used to seek comprehensive optimizations of line loss, voltage profile and power flow distribution using UPFC [10][11][12][13]. However, a big challenge of implementing OPF algorithms in real-time operation is the computational task, which is time consuming and generally hourly based [14].…”