Abstract
Problem statement: Static Var Compensators (SVC) devices are used to improve voltage and reactive power conditions in AC systems. An additional task of SVC is to increase transmission capacity as result of power oscillation damping. The effectiveness of this controller depends on its optimal location and proper signal selection in the power system network. A residue factor had been proposed to find the optimal location of the SVC controllers to damp out the inter-area mode of oscillations. Approach: The proposed residue factor was based on the relative participation of the parameters of SVC controller to the critical mode. A simple approach of computing the residue factor had been proposed, which combined the linearized differential algebraic equation model of the power system and the SVC output equations. Input-output controllability analyses were used to assess the most appropriate input signals (stabilizing signal) for SVC device. Results: The placements of SVC controller had been obtained for the base case as well as for the critical contingency cases. Conclusion: The effectiveness of the proposed method was demonstrated on 25 bus of south Malaysian power system.
Highlights
Damping of electromechanical oscillations between interconnected synchronous generators is necessary for a secure system operation
Power System Stabilizers (PSSs) are effective for controlling system oscillations but they are usually designed for damping local electromechanical oscillations while the behaviour of low frequency inter-area oscillations is generally determined by global parameters of larger parts of the power system
Placement: The Residue Factors for weakly damped inter-area mode, computed for Static Var Compensators (SVC) are given in SVC device on base case but for validating the placement, the critical contingency ranking is obtained and listed in Table 2 according eigenvalue concepts explained previously
Summary
Damping of electromechanical oscillations between interconnected synchronous generators is necessary for a secure system operation. Power System Stabilizers (PSSs) are effective for controlling system oscillations but they are usually designed for damping local electromechanical oscillations while the behaviour of low frequency inter-area oscillations is generally determined by global parameters of larger parts of the power system. Flexible AC Transmission Systems are being increasingly used to better utilize the capacity of existing transmission systems. Flexible AC Transmission System (FACTS) is a technology based solution to help the utility industry deal with changes in the power delivery business. A major thrust of FACTS technology is the development of power electric based systems that provide dynamic control of the power transfer parameters transmission voltage, line impedance and phase angle[1]
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