Adaptive fuzzy hysteresis band current control for reducing switching losses of hybrid active power filter

Abstract

Although hysteresis band current control is an easy to implement and robust control method for industrial power electronics converters, it has also some disadvantages like variable and high switching frequency causing high switching losses. In this study, a novel adaptive fuzzy hysteresis band current control system is proposed by making use of fuzzy expressions of both hybrid active power filter (HAPF) current and integral of its harmonic components to reduce the switching losses of threephase three-wire two-level HAPF. To reach this aim, a relation between switching frequency and integral of filter current harmonic components is formulised and used for defining a fuzzy hysteresis band. Moreover, the magnitude of the instantaneous current switched is also correlated to the switching losses; in this way, its fuzzy expression is also used for defining hysteresis band. Those fuzzy expressions are then utilised to constitute a dynamically changing hysteresis bandwidth. The proposed control system is finally optimised using EMTDC/PSCAD simulation environment and implemented in the field. The implemented HAPF system has been shown to successfully suppress all the interharmonic and harmonic current components produced by a steel melting facility occupying three induction melting furnaces and it has provided around 9% reduction in overall losses.

Effective Power Quality Improvement in PV Grid by using Adaptive Hysteresis Dynamic Active Power Filter Under Different Source Voltage Control Strategies

“…There are several types of PWM current control strategies among them adaptive hysteresis PWM current control strategy is more efficient in fast response and good current limiting capability for DSAPF [19]. Figure 6 shows the two level current controlled method of adaptive hysteresis current control.…”

Sliding mode control for performance improvement of shunt active power filter

“…However, OCC controller is not stable for certain types of loads. In [20,21] the conventional single band hysteresis current-control (SBHCC) scheme is used showing good accuracy and quick response, but the high switching frequency results in high switching losses. To overcome the problem of high switching frequency an adaptive hysteresis current-control [22] and double band hysteresis current control [23] are proposed.…”

Power quality enhancement by hybrid DSTATCOM with improved performance in distribution system

“…Moreover, the losses due to switches in the TC LC or SVC reduces the efficiency of the system. An adaptive fuzzy hysteresis band current control for switching losses reduction in hybrid active power filter is discussed 9 . A hybrid DSTATCOM with reduced dc‐link voltage is proposed for reactive power compensation and harmonic mitigation 10 .…”

“…An adaptive fuzzy hysteresis band current control for switching losses reduction in hybrid active power filter is discussed. 9 A hybrid DSTATCOM with reduced dc-link voltage is proposed for reactive power compensation and harmonic mitigation. 10 In this topology, the required volt-ampere rating of VSI is low when compared with VSI rating in L-DSTATCOM.…”