Sensorless predictive control of three-phase parallel active filter

High power, zero ripples active filtering system with power modules operating in parallel

“…The frequency response of LCL filter with small equivalent resistances of 1 L and 2 L is depicted in Fig. 1.…”

“…1. The LCL filter should be designed to provide appropriate resonance frequency below PWM switching frequency, required attenuation of current ripples, acceptable level of ripples in the inner inductor 1 L , and low idle reactive power which loads VSI. The detailed LCL filter design is out of the scope of the paper and the exemplary design procedure is given in [4].…”

“…In the proposed control system a novel, model based predictive current controller for LCL-based APF is implemented, which is a substantially developed algorithm of the controller for L-based APF presented in [1]. The controller provides full utilization of APF operating region and performs a full control signals prediction, thus it ensures maximum dynamics of current control which can be achieved for particular circuits parameters of APF, that is: grid voltage e, DC voltage u DC , inductances L 1 , L 2 and capacitance C.…”

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.…”

“…In [3], a shunt hybrid APF was designed using only one current sensor on the load side. In [4], an estimator was proposed for the grid voltage for the voltage sensorless operation of three-phase APFs. 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.…”