Development of Shunt‐Type Three‐Phase Active Power Filter with Novel Adaptive Control for Wind Generators

Abstract

This paper proposes a new adaptive filter for wind generators that combines instantaneous reactive power compensation technology and current prediction controller, and therefore this system is characterized by low harmonic distortion, high power factor, and small DC-link voltage variations during load disturbances. The performance of the system was first simulated using MATLAB/Simulink, and the possibility of an adaptive digital low-pass filter eliminating current harmonics was confirmed in steady and transient states. Subsequently, a digital signal processor was used to implement an active power filter. The experimental results indicate, that for the rated operation of 2 kVA, the system has a total harmonic distortion of current less than 5.0% and a power factor of 1.0 on the utility side. Thus, the transient performance of the adaptive filter is superior to the traditional digital low-pass filter and is more economical because of its short computation time compared with other types of adaptive filters.

Adaptive Nonlinear Control of Reduced‐Part three‐Phase Shunt Active Power Filters

“…Compared to previous controllers, the new adaptive nonlinear controller enjoys several appealing features. As mentioned above, the new controller is able to meet its control objectives despite the uncertainty that prevails on some parameters (grid impedances, load), while in most previous works all systems parameters are supposed to be perfectly known [6,8,9,11,12,15]. Moreover, the impedances are not presently assumed to be identical, unlike in the previous works. It is formally proved, using a rigorous theoretical analysis, that the control objectives (i.e., PFC and DC voltage regulation) are actually achieved.…”

“…• As mentioned above, the new controller is able to meet its control objectives despite the uncertainty that prevails on some parameters (grid impedances, load), while in most previous works all systems parameters are supposed to be perfectly known [6,8,9,11,12,15]. Moreover, the impedances are not presently assumed to be identical, unlike in the previous works.…”

“…Moreover, the impedances are not presently assumed to be identical, unlike in the previous works. It is formally proved, using a rigorous theoretical analysis, that the control objectives (i.e., PFC and DC voltage regulation) are actually achieved. Such a formal analysis was missing in the previous works [6,9–11,13,15]. The implementation of the new controller is simpler because it does not necessitate sensors for the measurement of the grid voltages. As a matter of fact, the reduction of the number of sensors entails an increase of the controller reliability.…”

“…• It is formally proved, using a rigorous theoretical analysis, that the control objectives (i.e., PFC and DC voltage regulation) are actually achieved. Such a formal analysis was missing in the previous works [6,[9][10][11]13,15]. • The implementation of the new controller is simpler because it does not necessitate sensors for the measurement of the grid voltages.…”

Least Mean Squares and Recursive Least Squares Algorithms for Total Harmonic Distortion Reduction Using Shunt Active Power Filter Control

“…Nowadays, two types of power filters are commonly used: passive [5] and active [6]. A passive power filter (PPF) consists of inductors and capacitors, and its circuit design is simple, but it has the following disadvantages [7]:…”