Role of Unified Power Flow Control in Voltage Power Transfer : A Critical Study
Keywords:
Power Flow, Power TransferAbstract
The unified power flow controller (UNIFIED POWER FLOW CONTROL) is being used as a compensating and power control device in the power systems due to its easy build, high robustness and efficiency. Simulation results reveal that as far as voltage sag and swell are concerned both the two-level and five level inverter based UNIFIED POWER FLOW CONTROL exhibit the similar performance.As the five level inverter based UNIFIED POWER FLOW CONTROL generates nearly sinusoidal load voltage, its THD is observed to be 3.15%. It is 15.65% in the case of its two level counterparts. It may be noted that for power of good quality the THD must be less than or equal to 5% as per standards. Hence, with respect to power quality, the five level UNIFIED POWER FLOW CONTROL scheme has an edge over two level UNIFIED POWER FLOW CONTROL scheme.
References
Ahed Kazemi and Ali Azhdast, “Implementation of a Control Strategy for Dynamic Voltage Restorer (DVR) and Dynamic Voltage Compensator (DVC)”, IEEE Power System Conference, pp. 1-6, 2009.
Ahmed A. Helal and Mohamed H. Saied, “Dynamic Voltage Restorer Adopting 150% Conduction Angle VSI”, IEEE Electrical Power and Energy Conference, pp. 1-6, 2008.
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Aiello, MF, Hammond, PW & Rastogi, M 2001, Modular Multi-level Adjustable Supply with Series Connected Active Inputs US Patent 6236580.
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