A novel power quality enhancement scheme for three‐phase differential boost inverter–based grid‐connected photovoltaic system with repetitive and feedback linearizing control

Abstract

Summary In grid‐connected (GC) photovoltaic (PV) system with a three‐phase voltage source inverter (VSI), one major requirement is that the DC‐side voltage should be greater than the inverter AC‐side voltage. In many PV installations, this is difficult to attain without an additional DC‐DC converter. For such scenarios, a three‐phase differential boost inverter, where input DC voltage can be less than AC‐side voltage, is a promising configuration. For GC PV systems integrated with such power electronic switching converters, the power quality control also plays a significant importance. In this paper, a novel power quality control technique for such a GC PV system based on three‐phase differential boost inverter has been proposed and evaluated. The proposed control system consists of three subsystem level control loops: (1) a novel control unit for reference voltage generation required for power quality improvement, (2) a double‐loop control strategy with plug‐in–type repetitive Proportional‐Integral (PI) control for outer loop and feedback linearizing control for inner loop meant for tracking of boost inverter output reference voltages, and (3) another bidirectional DC‐DC converter controller for battery operation. The performance of the proposed control algorithms has been tested under various scenarios, ie, power management, transition between GC to stand‐alone (SA) modes and vice versa, and grid current compensation under unbalanced load, nonlinear load, and unbalanced and distorted grid voltage conditions. Extensive simulation and experimental results are reported for validating the proposed control technique.

Single-Stage Three-Phase Grid-Tied Isolated SEPIC-Based Differential Inverter With Improved Control and Selective Harmonic Compensation

“…These low-order harmonics of differential inverter were studied in many papers and covered many buck-boost DC-DC converters such as Cuk, SEPIC, and flyback converter [42][43][44][45][46][47][48][49][50][51][52][53][54]. For all, these harmonics resulted from two sources and given as:  Second-order Negative Sequence Harmonic Component (NSHC).…”

“…The same approach is implemented for gridconnected differential inverter topologies based on five different DC-DC buck-boost converters, as presented in [42]. Unlike the continuous modulation scheme (CMS) proposed in [41][42][51][52][53][54], single-phase and three-phase Cuk-based differential inverters using Discontinuous Modulation Scheme (DMS) were presented in [44][45] and [46][47], respectively. This modulation has decreased the circulating currents between different Cuks in both topologies, and thereby, circulating power loss in addition to NSHC.…”

Improved power quality converter for three‐phase grid‐interfaced PV array fed reduced current sensor‐based induction motor drive for water pumping

“…However, the maintenance cost of a battery is high with low durability. Therefore, researchers have to find alternative ways in the form of utility grid . The power factor‐corrected (PFC) converters are basically used for the power transfer.…”

Processor in the loop test for algorithms designed to control power electronics converters used in grid‐connected photovoltaic system

“…[15][16][17][18][19][20][21][22][23] Considerable efforts are effectively made to control these systems. Therefore, many solutions are proposed in order to improve their energy efficiency.…”

“…Therefore, many solutions are proposed in order to improve their energy efficiency. [15][16][17][18][19][20][21][22][23] Considerable efforts are effectively made to control these systems. The most common control strategies applied to the grid-tie inverter are based on either voltage-oriented control (VOC) 23 or decoupled current control.…”