A control scheme employing an adaptive hysteresis current controller and an uncomplicated reference current generator for a single-phase shunt active power filter

In recent years, active power filters (APFs) have become popular because of their excellent current harmonics and reactive power mitigation ability. The performance of the APF is directly related to the selected control strategy, which is mainly divided into 2, the reference current generation and current control. Most of the reference current generation methods are very complicated and require precise mathematical expressions. Moreover, being the most preferred current control method, conventional hysteresis controllers have a fixed bandwidth, which causes different total demand distortion values under different load conditions. In this study, a novel control scheme for a single-phase shunt APF is proposed. The proposed scheme uses an uncomplicated modification of the sine multiplication method for extraction of the reference filter current. Moreover, it employs an adaptive hysteresis current controller that changes its bandwidth according to the active power demand of the load. Thus, the requirements of the current harmonics limits specified in IEEE Std. 519-1992 are always fulfilled under different load conditions. A single-phase shunt APF controlled by the proposed scheme is modeled and simulated under nonlinear load conditions using MATLAB/Simulink. The simulation results indicate that the APF effectively compensate the current harmonics and reactive power at the point of common coupling of the AC mains.

Anahtar Kelimeler:

Active power filter, hysteresis current controller, sine multiplication method, fuzzy logic, reference current generator

A control scheme employing an adaptive hysteresis current controller and an uncomplicated reference current generator for a single-phase shunt active power filter

Keywords:

Active power filter, hysteresis current controller, sine multiplication method, fuzzy logic, reference current generator,

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Filter Current [ifl] Filter Current 2 1 2 Conn2 g a k RL Figure 12. Simulink model of the proposed adaptive HCC. Figure 13. Nonlinear AC regulator load. Figure 14 shows the active and reactive powers drawn by the load, which increase from 912 W (1136
VAr) to 1824 W (2272 VAr) and decrease from these values to 456 W (568 VAr). Figure 15 shows the variation of the load current and source voltage, and Figure 16 shows the TDD of the load current during and after these load changes.
In contrast, with the traditional HCC, different TDD values are obtained under the same load conditions, while some of them are unnecessarily below the allowed limits and some of them are above. Moreover, after each load change, the DC bus voltage, which is an important parameter of the APF, settles at a predefined reference References