Abstract
This paper presents a simplified control scheme for three-phase three-level series active power filter to compensate all load voltage perturbations such us harmonic unbalances, sags and swells. The standard configuration of three-phase series active power filter uses the two-level three-phase voltage source inverter with hysteresis controller. This configuration presents some drawbacks and is limited to low power systems. Today three-level (NPC) inverter is one of the most successfully employed topology in various industrial applications. In this paper a new scheme to increase the capability of series Active Power Filter (APF) voltage controller based on three-level inverter using simplified Pulse Width Modulation (PWM), is proposed. The control strategy adopted use instantaneous reactive power theory, easy to implement and gives good performance for all load voltage perturbations. The numerical simulation results carried with MATLAB-Simulink and SimPowerSystem Toolbox show the effectiveness of the proposed control scheme.
Highlights
With proliferation of nonlinear loads, harmonic pollution is being considered as one of the major problems that degrade the power quality [1]
This paper presents a new pwm voltage controller for three-level neutral point clamped (NPC) series active filter for protecting sensible and critical voltage loads under all voltage perturbations
The effectiveness of the proposed series active filter has been demonstrated in maintaining the three-phase load voltages balanced and sinusoidal, the proposed system does not show any significant effect of perturbation type present in the utility voltages on its compensation capability and the load voltage under all voltage perturbations is maintained constant and sinusoidal
Summary
With proliferation of nonlinear loads, harmonic pollution is being considered as one of the major problems that degrade the power quality [1]. Shunt active power filters have been proposed as an interesting and high performance solution to improve the power quality, the shunt active power filter is used for reactive power and load current compensation by injecting equal but opposite harmonics current [2]. Three single phase transformers are used to perform the series connection This structure is limited to low power applications, for medium or high voltage three-level inverter is recommended. This paper presents a new pwm voltage controller for three-level neutral point clamped (NPC) series active filter for protecting sensible and critical voltage loads under all voltage perturbations. The organization of this paper begins with series active filter configuration based on three-level inverter, followed by control strategy adopted to calculate compensation voltages, before coming to the results simulation and discussion, and ended with conclusions
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