Abstract
Control strategies for extracting the three-phase reference currents for shunt active power filters are compared, evaluating their performance under different source conditions with PI and Fuzzy Controllers in MATLAB/Simulink environment When the supply voltages are balanced and sinusoidal, the two control strategies are converge to the same compensation characteristics; However, the supply voltages are distorted and/or un-balanced sinusoidal, these control strategies result in different degrees of compensation in harmonics. The compensation capabilities are not equivalent, with p - q control strategy unable to yield an adequate solution when source voltages are not ideal. Extensive simulations are carried out with PI controller and also with Fuzzy controller for both p-q and Id-Iq control strategies under different main voltages. Extensive Simulations are carried out with PI as well as fuzzy controller for both p-q and Id - Iq control strategies by considering different voltage conditions and adequate results were presented. On owing Id - Iq method with fuzzy logic controller gives away an out-standing performance under any voltage conditions (balanced, un-balanced, balanced and non-sinusoidal).
Highlights
The power-electronic-based loads such as adjustable speed drives, rectifier equipment used in telecommunication networks, power supplies, domestic appliances, etc offer highly nonlinear characteristics
Control strategies for extracting the three-phase reference currents for shunt active power filters are compared, evaluating their performance under different source conditions with PI and Fuzzy Controllers in MATLAB/Simulink environment When the supply voltages are balanced and sinusoidal, the two control strategies are converge to the same compensation characteristics; the supply voltages are distorted and/or un-balanced sinusoidal, these control strategies result in different degrees of compensation in harmonics
These nonlinear loads draw non-sinusoidal [1] currents from ac mains and cause reactive power burden and excessive neutral current. They are responsible for lower efficiency and interference of distribution system with the nearby communication networks
Summary
The power-electronic-based loads such as adjustable speed drives, rectifier equipment used in telecommunication networks, power supplies, domestic appliances, etc offer highly nonlinear characteristics These nonlinear loads draw non-sinusoidal [1] currents from ac mains and cause reactive power burden and excessive neutral current. They are responsible for lower efficiency and interference of distribution system with the nearby communication networks. The Mamdani type of fuzzy controller [6] used for the control of APF gives better results compared with the PI controller, but it has the drawback of a larger number of fuzzy sets and 49 rules This increases the complexity of the controller; this demands large computational time. On observing id-iq method with fuzzy logic controller gives away an out-standing performance under any voltage conditions
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