Abstract
In this paper, we analyze the constraints of harmonics control in power electronic systems. Based on an equivalent circuit of a typical power converter application and its parameters, we have derived an analytical expression for calculating the maximal amplitude of controlled harmonic current. This expression has been successfully verified on an experimental setup, designed around a single-phase grid-connected bidirectional inverter. The pulse width modulated (PWM) driven inverter has been controlled by multiple resonant controllers, each of them providing individual control of a selected harmonic current. By using the derived expression and taking into account the parameters of converter application, power electronics designers could quickly determine the limitations of harmonics control.
Highlights
Control algorithms in power electronics devices often include harmonics control
Typical applications requiring a mitigation of harmonics are grid-connected in single-phase [4] and three-phase pulse width modulated (PWM) inverters [5,6], photovoltaic systems [7], uninterruptable power supplies [8,9], active power filters [10,11,12], and microgrids [13]
This paper focuses on limitations of current harmonics control in a Electronics 2019, 8, 739; doi:10.3390/electronics8070739
Summary
Many power converter applications require its implementation due to harmonics emission regulations [1,2], while others use it to improve efficiency [3]. Satisfactory results can be achieved only by advanced types of controllers that are usually implemented into the current control loop, e.g., resonant, multiple resonant, or repetitive controllers. The methods, which should theoretically completely eliminate certain harmonics (e.g., proportional-resonant PR with multiple resonant controllers MRC in [18], H∞ repetitive control in [13], etc.), fail to do so without further comments by the authors. The effects of output filters on the system performance have only been studied for passive devices [24]
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