Repetitive-Based Control for Selective Harmonic Compensation in Active Power Filters

Abstract

This paper proposes a repetitive-based controller for active power filters, which compensates selected current harmonics produced by distorting loads. The approach is based on the measurement of line currents and performs the compensation of selected harmonics using a closed-loop repetitive-based control scheme based on a finite-impulse response digital filter. Compared to conventional solutions based on stationary-frame current control, this approach allows full compensation of selected frequencies, even if the active filter has limited bandwidth. Compared to synchronous-frame harmonic regulations on line currents, the complexity of the proposed algorithm is independent of the number of compensated harmonics. Moreover, it is more appropriate for digital signal processor implementation and less sensitive to rounding and quantization errors when finite word length or fixed-point implementation is considered. Experimental results on a 5-kVA prototype confirm the theoretical expectations.

Current Harmonics Compensation in Microgrids Exploiting the Power Electronics Interfaces of Renewable Energy Sources

“…The key idea is that a proper trigger pulse generation will lead the converter to create a waveform that contains the suitable current mirror harmonic content, resulting in harmonic cancellation. Buck-boost's trigger pulses are being initially created by the comparison of the rectified PCC's voltage signal and the 20 KHz reference triangle, taking into consideration the duty cycle D of buck-boost converter, given by Equation (1). An FFT analysis of microgrid distorted current is performed.…”

“…In reference [1], a repetitive-based control scheme for selective harmonic compensation in active power filters is proposed. This controller compensates current harmonics created by distorting loads at selected frequencies.…”

A Fast-Transient Repetitive Control Strategy for Programmable Harmonic Current Source

“…Numerous control schemes have been proposed for PWM inverters, such as PID control, PR control, deadbeat control, and sliding mode control [1]- [4], to achieve this requirement. However, these methods often fail to follow the harmonic current accurately to determine the intrinsic disadvantages of the controller or the parameter uncertainties.…”

A Load Compensator Based on One-Cycle Control with Plug-In Repetitive Control

“…The repetitive controller can regulate all harmonics with one controller because the harmonics of line current are periodic signals, and the delay caused by the digital implementation can be easily compensated. Applying repetitive controllers to LCs under a typical structure with two parts have been attempted many times [26], [27]. However, as discussed before, LC performance is still degraded by the harmonic extractor.…”