Abstract
Unified Power Flow Controller (UPFC) device is applied to control power flow in transmission lines. Supplementary damping controller can be installed on any control channel of the UPFC inputs to implement the task of Power Oscillation Damping (POD) controller. In this paper, we have presented the simultaneous coordinated design of the multiple damping controllers between Power System Stabilizer (PSS) and UPFC-based POD or between different multiple UPFC-based POD controllers without PSS in a single-machine infinite-bus power system in order to identify the design that provided the most effective damping performance. The parameters of the damping controllers are optimized utilizing a Chaotic Particle Swarm Optimization (CPSO) algorithm based on eigenvalue objective function. The simulation results show that the coordinated design of the multiple damping controllers has high ability in damping oscillations compared to the individual damping controllers. Furthermore, the coordinated design of UPFC-based POD controllers demonstrates the superiority over the coordinated design of PSS and UPFC-based POD controllers for enhancing greatly the stability of the power system.
Highlights
When large power systems are interconnected through weak tie lines, Low Frequency Oscillations (LFO) in the range of 0.1–3 Hz are observed
We have presented the simultaneous coordinated design of the multiple damping controllers between Power System Stabilizer (PSS) and Unified Power Flow Controller (UPFC)-based Power Oscillation Damping (POD) or between different multiple UPFC-based POD controllers without PSS in a singlemachine infinite-bus power system in order to identify the design that provided the most effective damping performance
The installation of a Power System Stabilizer (PSS) appears as a simple and inexpensive technique for many years to produce an amount of damping torque through the injection of a supplementary stabilizing signal at a voltage reference input of an Automatic Voltage Regulator (AVR), which has increased the stability of the power system
Summary
When large power systems are interconnected through weak tie lines, Low Frequency Oscillations (LFO) in the range of 0.1–3 Hz are observed. Its primary function is to control and optimize the real and reactive power flow in a given line, voltage, and current at the UPFC bus [7, 8] This is achieved by regulating the controllable parameters of the transmission system such as line impedance, phase angle, and voltage magnitude. Beside these primary functions, it can provide appropriate damping effect to the tie interconnected modern power systems oscillation through its supplementary controller and increase system stability [9]. The coordinated designs (mB & δE), (mE & δE), (δE & δB), and (PSS & δE) are able to damp the LFO effectively and can accomplish this task faster and with lower overshoot in comparison to their individual control responses or the best individual controls δE and mB
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