A Comprehensive Review of Grid-Connected PV Systems Based on Impedance Source Inverter

Abstract

The increase in linking photovoltaic (PV) power plants to utility grids are due to the world expansion in PV systems and its advantages of low running cost, renewable, etc. Although PV is now considered one of the main power sources in many countries, it has low efficiency. Therefore, the big issue to improve the efficiency is to enhance the interface inverters' efficiency. Different inverter topologies have been proposed to relate to the PV panels; each has advantages and disadvantages. These topologies can be classified into two-stage and single-stage (impedance network) inverters. Impedance network inverters overcome the problems of traditional inverters and seek to realize the advantages of a two-stage system and reduce the number of power conversions. However, to the authors' best knowledge, there is no comprehensive review of the applications of the impedance source inverter for the PV system, including the control techniques. Therefore, this paper reviewed the existing topologies by paying attention to four key research issues: 1) various impedance network inverters and discusses the main structures from the point of view of the PV application, 2) control techniques suitable for impedance source inverters, comparing them in terms of complexity and theoretical performance, 3) investigation into the most important control methods used to connect the inverter output current with the network voltage, and 4) Challenges and future direction. Finally, this paper is provided as a brief reference to help researchers choose the appropriate impedance source inverter topologies for their applications and the preferred control and modulation methods for this type.

A novel control technique for various modes of grid-connected PV system to improve power quality.

“…Therefore, an effective controller, tuned with the PWM technique is required to maintain all the control parameters in the PV system without using external circuitry for controlling power quality indexes, however, the system could be controlled only with complete information about the system [10,16]. The PV module's manufacturer provides the datasheet with some specifications however, it is not complete data to understand the dynamic behavior of the system [17]. Therefore, some ways are needed to explore so that complete information about the PV system could be obtained.…”

Quasi‐Z based adaptive sliding mode control for three‐phase photovoltaic grid‐connected system

“…The performance and stability of three‐phase photovoltaic grid‐connected systems, based on the quasi‐Z‐source inverter, are influenced by multiple factors including the quality of power electronic equipment, the rationality of system design, and the reliability of inverter control strategies. In particular, the performance of the grid‐connected inverter control strategy directly affects the system's overall performance [4]. Hence, it plays a pivotal role in determining the stability and safety of the grid‐connected system while impacting various performance indices.…”

Symmetric Wide-Input-Voltage Range Boost Z-Source DC–DC Converter With Reduced Current of Source and Active Components

“…In this regard, various structures of impedance source converters have been proposed by authors. The structures can be classified in three distinct categories, as proposed in [1]: using magnetically coupled inductors/transformers [2][3][4][5], improving and expanding the impedance network [6][7][8][9][10][11][12][13][14][15][16][17][18], and using extra active switches in the impedance network [19]. All these structures aim to achieve some of the following benefits: higher voltage gain, less inrush current, less stress on devices, higher efficiency and higher power density.…”