Abstract
The Flexible Alternating Current Transmission Systems (FACTS) device deals with the control of power flow, alternating current of transmission line and immediately respond towards the stability problems of the system. The present paper show that how the FACTS device STATCOM enhance the dynamic response and voltage flicker in distribution network of the power systems. In MATLAB a simplified distribution system is modeled and the find out the desired objectives. D-STATCOM changes from inductive to capacitive operation, the modulation index of the PWM inverter is increased from 0.56 to 0.9 which corresponds to a proportional increase in inverter voltage. Reversing of reactive power is very fast, about one cycle, as observed on D-STATCOM current. Observed on Scope that voltage fluctuation at bus B3 is now reduced to +/- 0.7 %. The D-STATCOM compensates voltage by injecting a reactive current modulated and varying between 0.6 pu capacitive when voltage is low and 0.6 pu inductive when voltage is high.
Highlights
Dynamic response and voltage flicker is an important issue in the control of electric power systems
The VSI generates a controllable AC voltage source behind the leakage reactance. This voltage is compared with the AC bus voltage system, when the AC bus voltage magnitude is above that of the VSI voltage magnitude, the AC system sees the STATCOM as an inductance connected to its terminals
If the VSI voltage magnitude is above that of the AC bus voltage magnitude, the AC system sees the STATCOM as a capacitance connected to its terminals
Summary
Dynamic response and voltage flicker is an important issue in the control of electric power systems. This paper illustrates the effect of STATCOM in distribution of power system on dynamic response and voltage flicker control by proper modelling of simple distribution power system and voltage source converter based STATCOM using Simulink model in MATLAB. [Brahmaiah et al, Vol.[4] (Iss.4): April, 2017]
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