Abstract
This paper presents a new method for Coordination of UPFC controllers. UPFC is one of the most important FACTS devices which have many applications include damping low-frequency oscillations, transient stability enhancement, active power and reactive power integrated control. Designing the appreciate controller for these devices has a major role in enhancing the stability and damping the oscillations. Using the Power System Stabilizer (PSS) is one of the most important methods for damping low-frequency oscillation which is economically efficient. In recent years, with the development of power electronics, the use of FACTS devices is one of the main strategies for damping low-frequency oscillations. Designing appropriate controllers for these devices has a major role in enhancing the stability and oscillation damping. In this study a new method based on output feedback is proposed for Designing UPFC controller. In this method input of the system expressed in terms of available outputs, so with the right choice of the output feedback gain of the target the system, it become stable. The output feedback gain are designed and compared for various UPFC and PSS controllers.
Highlights
The rapid increase in load demand from consumers and the development of power grids, lead to expand network and connections between the regions, which leads to low frequency oscillations in power system
It should be noted that the four control parameter in the Unified Power Flow Controller (UPFC), can be used as regulator to reduce the power system transient oscillations
UPFC is one of the Flexible AC Transmission Systems (FACTS) device which is capable of controlling power and voltage simultaneously and can improve network stability
Summary
The rapid increase in load demand from consumers and the development of power grids, lead to expand network and connections between the regions, which leads to low frequency oscillations in power system. FACTS devices in addition to enhancing the damping of the power system oscillations, is able to control the power and the voltage of the system. UPFC can be applied to enhance transient stability, voltage control and damping system oscillation in addition to controlling the power flow of the transmission line. UPFC is able to simultaneously or selectively control of all parameters affecting the value of the power in transmission line (voltage, impedance and phase angle). It can be independently control the value of both active and reactive power in transmission line. A novel method for the design of output feedback controller for UPFC is developed in order to enhance the damping of power systems low frequency oscillations. The nonlinear and the linear model of the system is presented and to demonstrate the efficiency of the proposed stabilizers, the results of this controller takes into account a wide range of operating conditions and system configurations and compared with a classic PSS controller
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