Abstract
Mitigation of harmonics for a grid-connected inverter is an important element to stabilize the control and the quality of current injected into the grid. This paper deals with the control method of a three-phase Grid-Connected Inverter (GCI) Photovoltaic (PV) system, which is based on the zero-sequence current adjuster. The proposed method is capable of removing the harmonic current and voltage without using any active and passive filters and without the knowledge of the microgrid topology and also impedances of distribution bands and loading conditions. This concept is adopted for the control of a Distributed Generator (DG) in the form of grid-connected inverter. The proposed control can be applied to the grid connected inverter of the PV. The fast dynamic response, simple design, stability, and fast transient response are the new main features of the proposed design. This paper also analyzes the circuit configuration effects on the grid connected inverter capability. The proposed control is used to demonstrate the improved stability and performance.
Highlights
In recent years, the Distributed Generation (DG) based on Renewable Energy Sources (RESs) have been playing an important role in the world’s energy supply systems [1]
A control method has been presented as an improved current control strategy for three-phase photovoltaic grid-connected inverters under unbalanced and nonlinear load conditions
It is difficult to suppress the harmonic content in the output current of lower than the pre-set value in the Grid-Connected Inverters (GCI)
Summary
The DGs based on Renewable Energy Sources (RESs) have been playing an important role in the world’s energy supply systems [1]. Paper [19] proposed a synchronous reference frame control method for current unbalance compensation in the microgrid. This method is based on the proper control of Distributed Generations (DGs) interface converters. It proposed the direct change of the current reference to compensate for current unbalance. Four possibilities of the network topology changes were considered with the proposed iterative process for ground fault analysis It discusses the ground fault model of a battery energy storage system as a distributed energy resource, which can be used for both islanded and grid-connected modes. Where k pV (k pI ) and krV (krI ) are the proportional and resonant factors of the voltage and current controller, respectively
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