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In order to utilize the existing transmission line to its full capacity Flexible AC Transmission system (FACTS) are used. The power flow control is effective if all the elements of the transmission line must be varied simultaneously or individually. To achieve this, the key appropriate FACTS device is Unified Power Flow controller (UPFC). The use of conventional controllers delays the decision making...
Low Frequency Oscillations (LFO) occur in power systems because of lack of the damping torque in order to dominance to power system disturbances as an example of change in mechanical input power. In the recent past Power System Stabilizer (PSS) was used to damp LFO. FACTs devices, such as Unified Power Flow Controller (UPFC), can control power flow, reduce sub-synchronous resonance and increase transient...
This paper presents a Bibliography of Flexible AC Transmission System (FACTS) for 2008. It provides a listing of various journal and conference papers in this area.
Sometimes power utilities in contingency conditions should work far away from their pre-designed conditions. Various control strategies have been reported recently to control UPFC in different operating conditions. PI regulators used for controlling UPFC suffer from the inadequacies of providing suitable control and transient stability enhancement over a wide range of system operating conditions....
In this paper, robust stabilizing controllers for the synchronous generator speed, series power flows, voltage magnitude and DC link voltage are designed for a power system with FACTS device (UPFC). To design these controllers, a combined super-twisting sliding mode (SM) and block control (BC) technique is implemented. The block control approach is used to design linear and nonlinear sliding manifolds...
A robust control strategy is proposed to control UPFC in different operating conditions. PI regulators used for UPFC suffer from the inadequacies of providing suitable control for transient stability enhancement over a wide range of system operating conditions. In this paper an optimization method based on particle-swarm optimization (PSO) algorithm is presented to optimize the parameters of the PI...
The unified power flow controller (UPFC) is nowadays one of the most useful Flexible AC Transmission Systems (FACTS), allowing the simultaneous control of the bus voltage and line active and reactive power. This paper presents the model, cross-coupling free current mode control approach, simulations and experimental results in static and dynamic conditions of a current mode controller for the UPFC...
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