Multivariable load current sensorless controller for universal active power filter

Abstract

The universal active power filter is one of most efficient solutions to problems related to energy quality. The topology integrates series and parallel active filter, and theoretically has the compensation capacity of both. The efficiency of compensation, however, is dependent on the control strategy implemented. Moreover, the controller determines the necessary number of sensors and measurement techniques, consequently, it determines associated costs. This study uses a multivariable approach for synthesis and development of a decoupled control. The proposed strategy uses only measuring of the input currents, thereby reducing the number of current sensors. The strategy is validated in simulation and experimentally in a 1.1 kVA laboratory prototype.

Shaping control strategies for active power filters

“…Traditionally, the AC loop in shunt active filters performs current tracking and in series active filters performs voltage tracking. However, these can be interchanged using the proper impedance in the circuit [3].…”

High‐performance unified power quality conditioner using non‐linear sliding mode and new switching dynamics control strategy

“…Nowadays, power quality (PQ) issue is one of the major problems due to growing usage of non-linear power electronics loads and equipment in residences as well as in industries [1] has led to create harmonics in voltage and current. In addition, various network faults and switching of capacitor banks also create PQ issues, such as voltage sag/swell, voltage unbalance and voltage interruptions.…”

“…1b. The conventional dynamic equations of plant model in a d-q frame are presented in (1) and (2). The plant system representation model is depicted in Fig.…”

Voltage Sensorless Control of Single-phase Active Power Filter Based on the Second-order Generalized Integrator Algorithm

“…However, very little attention has been paid toward the issues of voltage sensorless single-phase APFs. To reduce the cost of the systems, some works have been reported to reduce the number of sensors for both single-and three-phase APFs [1][2][3][4][5]. In [3], a shunt hybrid APF was designed using only one current sensor on the load side.…”

“…Most of the designers have also used two current sensors on the three-phase lines; the third phase is estimated or calculated according to the real measured phases. In [5], a strategy was proposed that only measured load currents.…”