Impact of Renewable Energy Generation on Voltage Flicker with Dynamic Load Connected to Distribution Network

摘要

Voltage flicker is one of the power quality issues in a distribution network, which can occur due to voltage fluctuations as a consequence of the changes in the electrical load currents flowing through the system impedance. The effect of large loads produces voltage modulation on the line, creating noticeable changes in light intensity. Similar scenario occurs when large industrial load is switched on in a weak distribution network or where the location of such large load is far from the substation, all the customers/households around such area will experience the impact due to a rapid change in voltage, light levels tend to vary, light can dim or light up simultaneously, become noticeable and annoying. The resultant effect is known as flicker. One of the primaries aims of Renewable Energy Generation (REG) is to be installed close to the consumers or load centres. When REG is integrated into the grid near a dynamic load, its impact on voltage flicker need to be evaluated. This paper investigates the impact of Renewable Energy of Wind(using the doubly fed induction generator as a wind energy converter) on voltage flicker when large dynamic loads are connected to a local electrical distribution network. The standard Institute of Electrical and Electronics Engineers (IEEE) 13 bus network is used as test system and modelled in MATLAB/SIMULINK. The outcome showed that REG does not conduce to the voltage flicker emanated from dynamic load, otherwise, it reduces the glint. The recommendation includes: a compensator device should be installed close to the flicker affected area or near the large loads in a weak distributed network to attenuate voltage flicker and improve power quality.