Abstract
Problem statement: In power systems, there exists a continuous challenge to improve dynamic performance of power system. Approach: Static Synchronous Compensator (STATCOM) is a power electronic based device that has the capability of controlling the power flow through a line. This study applies the Static Synchronous Compensator (STATCOM) to control the power flow during dynamic period. To verify the effect of the STATCOM on dynamic performance, the mathematical model and control strategy of a STATCOM was needed to be presented. The converters of STATCOM were represented by variable voltage source with associate transformer leakage reactance and the voltage source and the reactance were transformed into current injection. The current injection model of STATCOM was modeled into power flow equation and thus it was used to determine control strategy. This study applies the fuzzy logic control to determine the control strategy of STATCOM. The swing curves of the three phase faulted power system without and with a STATCOM was tested and compared in various cases. Results: The swing curve of the system with STATCOM based fuzzy logic control had the less amplitude during the dynamic period. Conclusion: STATCOM can improve the dynamic performance of the system after disturbance.
Highlights
(or current) of the STATCOM can be adjusted by controlling the magnitude and phase angle of the output
This study presents the fuzzy logic control law of problem due to blackout in Northeast United States, STATCOM
E′X2 cos(δ θm ) + X1Vb X1 + X2 cos θm. It can be seen from Eq 4, 8 and 11 that the parameter of STATCOM doesn’t affect on line voltage angle but it affects on line voltage magnitude
Summary
(or current) of the STATCOM can be adjusted by controlling the magnitude and phase angle of the output. After some mathematical manipulations of Eq 910, the voltage magnitude at bus m of the system with a STACOM is given by Eq 11: E′X2 cos(δ θm ) + X1Vb X1 + X2 cos θm. It can be seen from Eq 4, 8 and 11 that the parameter of STATCOM doesn’t affect on line voltage angle but it affects on line voltage magnitude. Fuzzy logic control: The dynamic equation of power system as shown in Fig. 2a can be expressed by following Eq 12 and 13: δɺ = ω (12).
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