Improving the Voltage Stability as Extreme Load Variations using STATCOM

M. Jazaeri and M. Shademan (Iran)


STATCOM, voltage stability, reactive power compensation, decoupled current control, phase locked loop, load variation.


The paper investigates the dynamic performance of the Static Synchronous Compensator (STATCOM) based on a decoupled current control strategy for combined reactive power compensation and voltage stabilization under various load conditions. A 24-pulse (three levels) Gate Turn-Off thyristor voltage source converter model is designed to represent the operation of the STATCOM within a power transmission system. The basic application of the STATCOM is to supply fast voltage support to the power system, therefore maximum response rate of the voltage regulation loop is always expected. This paper presents the novel method simulation for phase locked loop for exact calculating converter firing angle using fast voltage measurement to improve STATCOM function and comprising it with other methods of simulation for phase locked-loop. The complete digital simulation of the STATCOM within the power system is performed in MATLAB/Simulink environment using the Power System Block set (PSB). The proposed novel phase locked-loop schemes for the STATCOM are fully validated by digital simulation.

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