Comparison of three control theories for single-phase Active Power Filters

Abstract

Active Power Filters have been developed in last years, mostly for three-phase systems applications. The use of Shunt Active Power Filters on single-phase facilities brings many benefits for the electrical grid, since these installations have non linear loads and power factor problems, and in their total, they are responsible by a significant portion of the total electric energy consumption. Harmonics and reactive power consumed by single-phase installations cause additional power losses on the electrical grid. So, mitigate harmonics at the origin helps reducing these extra losses and other problems caused by the harmonics. The drawback of this solution is the necessity of a large number of Active Power Filters distributed by the generality of the single-phase facilities. So, it becomes necessary a simple and low cost Shunt Active Power Filter to install on single-phase installations. This paper presents three simple control theories to use on single-phase Shunt Active Power Filters. Simulation and experimental results comparing the three different control theories are presented and analyzed. I.

The Switched Control of Single Phase Active Power Filter

“…Note that a harmonic attenuation all over the frequency spectrum is mostly achieved by the switched control, leading to a better compensation of the distorted current caused by the nonlinear load current. The control of APF is comprised by the linear voltage control reported in [5], the effectiveness and rationality of the approach proposed is confirmed by the simulation and comparison. Further research is needed to eliminate the overshoot caused by the quadratic convergence characteristics of the proposed control approach…”

“…In order to compare the performance of the control approach, the linear voltage control proposed in [5] is simulated with the same conditions and the parameters of the simulation system. The steady-state source current of the control reported in [5] and its total harmonic distortion are depicted in Fig. 7 (a) and (b).…”

“…Note that parts of the unwanted load current harmonics have been compensated and the total harmonic distortion has just reduced to 18.40%. The reason why the compensation effect of the approach in [5] is worse is that [5] ignores the nonlinear switching characteristics of APF and carries out the circumstances mentioned above.…”

Harmonics Mitigation Techniques in Renewable Energy Systems using Shunt Active Power Filter

“…In this paper given attention on shunt active filter for power acquisition which offers reactive power compensation, harmonic compensation, flicker/imbalance compensation and voltage regulation. This paper deals with different power quality issues and from that harmonics is one of the important issues that affect on equipment connected in our system [2]. Due to leap downside of passive filter, active filter used for harmonic reduction.…”

Optimal design of a single-phase APF based on PQ theory

“…However, it requires an accurate and balanced sinusoidal source voltage. Therefore, for unbalanced and distorted source voltage condition a Unit Vector Template (UVT) addition is needed [16] or PLL with PQ theory.…”