Abstract

MARULANDA DURANGO, Jesser James; ESCOBAR MEJIA, Andrés  and  ALZATE GOMEZ, Alfonso. A comparative study of five methods of harmonics compensation in active power filters. Tecnura [online]. 2017, vol.21, n.52, pp.15-31. ISSN 0123-921X.  https://doi.org/10.14483/udistrital.jour.tecnura.2017.2.a01.

Abstract Context: One of the functions of an Active Power Filter (APF) is to calculate current set points (i.e. harmonic reduction, power factor correction and current and voltage balancing) that compensate the power source. There are several algorithms in the literature that perform this function, so the objective in this article is to present the results obtained from the implementation of five algorithms proposed in the literature, under conditions of distorted voltages. Method: The methodology consists of the implementation of the following algorithms: Instantaneous reactive power; unit power factor; perfect harmonic compensation; PQR algorithm; and synchronous frame of reference in the MATLAB simulation program. Then, we calculate the total harmonic distortion (THD), the effective value of the line current and its fundamental component, and the power factor (PF) at the three-phase source, using an electrical system composed of linear and non-linear loads with similar characteristics to a real circuit. We will take values before and after the connection to the network of the active power filter, considering each of the algorithms separately and maintaining the same conditions in the system for each of them. Other quantities are also calculated in the power system to make the comparison. Results: The main currents before and after the active power filter connection are displayed, in addition to the harmonic distortion of the currents and the power factor. We also present the waveform of the inverter continuous voltage with each of the algorithms used, in order to evaluate the performance of a voltage controller that requires filter. Conclusions: In operating conditions with distorted voltages in the power supply network, the algorithm with the best performance is the perfect harmonic compensation algorithm, since it uses a low-pass filter to mitigate the effects of the harmonics of the voltages on the calculation of the currents of compensation.

Keywords : Active power filters; Compensation; Harmonics; Power Factor; Power Quality.

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