Abstract
Hysteresis Current Control (HCC) is widely used due to its simplicity in implementation, fast and accurate response. However, the main issue is its variable switching frequency which leads to extraswitching losses and injecting high-frequency harmonics into the system current. To solve this problem, adaptive hysteresis current control (AHCC) has been introduced which produces hysteresis bandwidth which instantaneously results in smoother and constant switching frequency. In this paper the instantaneous power theory is used to extract the harmonic components of system current. Then fixed-band hysteresis current control is explained. Because of fixed-band variable frequency disadvantages, the adaptive hysteresis current control is explained that leads to fixing the switching frequency and reducing the high-frequency components in source current waveform. Due to these advantages of AHCC, the switching frequency and switching losses will be diminished appropriately. Some simulations are done in MATLAB/Simulink. The Fourier Transform and THD results of source and load currents and the instantaneous switching frequency diagram are discussed to prove the efficiency of this method. The Fourier Transform and THD results of source and load currents are discussed to prove the validity of this method.
Highlights
In recent years, shunt active power filters have being applied by many industries and researchers to remove the current harmonics caused by nonlinear loads [1,2,3]
Adaptive hysteresis current controller methods with the variable hysteresis band have been recommended in the literature [6, 7]
Instantaneous power theory is one of the effective methods which have been explained in this paper
Summary
Shunt active power filters have being applied by many industries and researchers to remove the current harmonics caused by nonlinear loads [1,2,3]. Conventional hysteresis method includes some undesirable results, such as variable switching frequency that causes audio noises, high switching losses and injection of high-frequency current components to the source current that makes it difficult to design suitable filters to remove these high-frequency harmonics. Different frequency components in current waveform will appear due to different switching frequencies that make it difficult to design appropriate filters to eliminate these components and make noises affects measuring devices To overcome this problem, an adaptive hysteresis current control (AHCC) has been introduced. An adaptive hysteresis current control (AHCC) has been introduced Using this method, variable hysteresis bandwidth is calculated instantaneously, which leads to reducing the switching frequency variation, the fixed-band HCC issues will be amended. By comparing the results of simulations, the advantages of AHCC in fixing switching frequency and modifying the above-mentioned problems, especially reducing the highfrequency components in source current waveform and switching losses, have been proved
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