Abstract
The Vietnamese power system has experienced instabilities due to the effect of increase in peak load demand or contingency grid faults; hence, using flexible alternating-current transmission systems (FACTS) devices is a best choice for improving the stability margins. Among the FACTS devices, the thyristor-controlled series capacitor (TCSC) is a series connected FACTS device widely used in power systems. However, in practice, its influence and ability depend on setting. For solving the problem, this paper proposes a relevant method for optimal setting of a single TCSC for the purpose of damping the power system oscillations. This proposed method is developed from the combination between the energy method and Hankel-norm approximation approach based on the controllability Gramian matrix considering the Lyapunov equation to search for a number of feasible locations on the small-signal stability analysis. The transient stability analysis is used to compare and determine appropriate settings through various simulation cases. The effectiveness of the proposed method is confirmed by the simulation results based on the power system simulation engineering (PSS/E) and MATLAB programs. The obtained results show that the proposed method can apply to immediately solve the difficulties encountering in the Vietnamese power system.
Highlights
This paper proposes a relevant method for optimal setting of a single thyristor-controlled series capacitor (TCSC) for the purpose of damping the power system oscillations
The event is on August 10, 1996, western blackout of Western Systems Coordinating Council (WSCC) interconnection, caused by the negative damping of the 0.25 Hz western interarea mode [6]
The optimal placement depends on the trace indices of the Gramian matrices that have been calculated on the active power perturbation in the line of the network
Summary
In order to overcome these drawbacks, this paper is a continuation of [34] and combines the Hankel-norm approximation method to determine the best location for installing TCSC with objective for damping power system oscillation of the practical power system, to wit Vietnamese power system It indicates that using the Gramian matrix-based method to calculate the complexity and large-scale power systems takes a lot of time since the system state matrix is very large. The optimal location is selected based on the maximum total Gramian energy calculated from the contingency outage cases (disturbance in lines) on the small-signal stability analysis that means the control input must insure the smallest control energy In line with this purpose, the Hankel-norm approximation method is applied to reduce the number of state variables when dealing with large-scale power systems. The algorithm for the transformation matrix can be found in the Appendix
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