Abstract
Problem statement: The critical clearing time provides very important role of the robustness in power system. The Static Synchronous Compensator (STATCOM) has been accepted to be equipped in modern power system. This study presents the method to evaluate the Critical Clearing Time (CCT) of the system equipped with a Static Synchronous Compensator (STATCOM). Approach: The parameter on STATCOM is modeled in energy function. The presented energy function is applied to determine CCT of the system. The verification of the proposed method is tested on sample system. Results: The maximum generator rotor angle of the faulted system without a STATCOM is continuously oscillation and the maximum value is much more than the system with a STATCOM. Conclusion: STATCOM based the proposed nonlinear control can damp power system oscillation.
Highlights
The proposed control energy function and control strategy of a power system with a STATCOM are tested on system of Fig. 1a
This study presents the method to evaluate the Critical Clearing Time (CCT) of the system equipped with a Static Synchronous Compensator (STATCOM)
The parameter of the STATCOM is modeled in the potential energy of a power system
Summary
Using time domain simulation method, it is time consuming process because it requires numerous of. For inductive mode of operation, Iq in (9), (10) and (12) needs to be replaced by -Iq. the dynamic equations of the generator with the STATCOM becomes: The location of a STATCOM should be placed at the location where it provides the maximum output electrical power. The proposed energy function will used for transient stability assessment of a power system with a STATCOM and it is used for deriving the control strategy. If machine angle reaches at the unstable equilibrium point (δ = δu) the potential energy function has the maximum value. For the first swing stability improvement the maximum of Iq should be used and the Iq is controlled by (20) given by: Again from the measured data (PR1, QS1 and Vm) and (23), the machine angle δ can be written as: δ.
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