Three-phase four-wire shunt hybrid active power filter model with model predictive control in imbalance distribution networks

Abstract

<span lang="EN-US">This paper presents a harmonic reduction and load imbalance model in a three-phase four-wire distribution network. This model uses a hybrid active power filter, a passive inductor and capacitor filter, and an active power filter in the form of a three-phase, four-leg connected grid inverter. The switching of the voltage source converter on this filter uses finite control set model predictive control (FCS-MPC). Control of this hybrid active power filter uses model predictive control (MPC) with a cost function, comparing the reference current and prediction current with mathematical modelling of the circuit. The reference current is taken from the load current by extracting dq, and the predicted current is obtained from the iteration of the voltage source converter (VSC) switching pattern. Each combination is compared with the reference current in the cost function to get the smallest error used as a power switching signal. Modelling was validated by using MATLAB Simulink. The simulation results prove a decrease in harmonics at a balanced load from 22.16% to 4.2% and at an unbalanced load, reducing the average harmonics to 4.74%. The simulation also decreases the load current imbalance in the distribution network. Reducing the current in the neutral wire from 62.01%-0.42% and 11.29-0.3 A.</span>

Investigation of bidirectional three-phase four-leg converter with LCL filter

“…This element of the UPS has an important functional purpose and in addition, provides many quality indicators, for example: low voltage total harmonic distortion (THD) when operating in inverter mode, high power factor and low level of DC voltage pulsations in rectifier mode [15]. To date, a number of studies of such bidirectional converters are known for use in various applications, for example, as a shunt active power filter [19] including for operation as part of UPS. One of the most in-depth studies can be called [20], where on the basis of more than 400 sources different versions of structures, algorithms of space-vector pulse-width modulation (SVPWM), control and application of these converters are presented.…”