Controller for the Grid-Connected Microinverter Output Current Tracking

Abstract

The modification of the proportional–integral (PI) controller with the variable proportional constant for tracking of the grid-connected photovoltaic microinverter output current has been proposed. The obtained results show that in the case when the proportional constant of the PI controller varies in time according to the appropriate law, the microinverter output current sinus shape distortions decrease as compared to the case when the ordinary PI controller is used. The operation of the microinverter with the proposed controller was investigated for the cases when the electrical grid voltage sinus shape is not distorted and when it is distorted by the higher harmonics.

Proportional Resonant Current Control and Output-Filter Design Optimization for Grid-Tied Inverters Using Grey Wolf Optimizer

“…This type of structure offers greater attenuation of the high frequency components when compared with the filters previously described. The ideal transfer function of LCL filters is given by Equation (11). Figure 6 shows six passive damping topologies that can be classified into three groups: series passive damping (SPD); parallel passive damping (PPD), and complex passive damping (CPD) [27].…”

“…These controllers provide a more precise control and lower current shape distortion. However, they require a detailed model of the system and its implementation is more complex [11]. In addition, when model plant mismatches are presented, this will influence the control accuracy and a significant extra sensors; and are more sensitive to parameter uncertainties [28].…”

Development of smooth asymmetric reactive power compensators

“…The reactive power appears when there is phase displacement between the grid current and voltage and is measured in volt-ampere reactive (VAR) units. One of the now-days main problems of the electrical grid is compensation of the reactive power in the low voltage grid (Ali et al, 2018;Arshad & Lehtonen, 2018;Balcells & Bogónez-Franco, 2013;Beck, Berlovich, & Braunstein, 2016;Beck, Berlovich, Muller, et al, 2016;Bielskis et al, 2020;Bogónez-Franco et al, 2011;Charalambous et al, 2019;Deblecker et al, 2016;Dong et al, 2012;Gayatri et al, 2018;Ilisiu & Dinu, 2019;Li et al, 2011;Merai et al, 2015;Santacana et al, 2010;Stanelyte & Radziukynas, 2020;Trentini et al, 2012;Xu et al, 2010;Yong Xue et al, 2009) Since the low-voltage three-phase lines are often loaded asymmetrically (Charalambous et al, 2019;Pană et al, 2018aPană et al, , 2018bTong XiangQian et al, 2005), the low voltage three phase lines are often loaded asymmetrically, i.e. the reactive power, which has to be compensated, is different in different phases.…”

“…Conventional renewable energy converters are usually designed for maximal active energy production. To be noticed, that amount of available active power ( ) is rarely at its maximum, consequently the amount of reactive power ( ) is sufficient for compensating purposes most part of the time at wind energy system (Bielskis et al, 2020;Macken et al, 2004;Pikutis et al, 2014).…”

Energetiškai efektyvaus fotovoltinio mikroinverterio kūrimas

“…Taip pat pateikti elementų parametrų įtakos mikroinverterio energetiniam efektyvumui analizės rezultatai. Gauti rezultatai paskelbti keturiose publikacijose (Bielskis et al 2020…”