A Harmonic Compensation Strategy in a Grid-Connected Photovoltaic System Using Zero-Sequence Control

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.

Influence of Parasitic Parameters on DC–DC Converters and Their Method of Suppression in High Frequency Link 35 kV PV Systems

“…On the basis Equations (6) and 7, the resonant current i r , magnetic current i m and secondary side current of transformer i s can be calculated. Since the drain-source voltage V ds and conduction resistance R ds(on) of the device are known, the conduction loss and switching loss of the devices can therefore be calculated.…”

“…Since PV power generation systems can alleviate the energy crisis and reduce environmental pollution, they have found broad application worldwide [1][2][3][4]. Traditional large-scale PV medium-voltage (MVAC) grid-connected systems mostly adopt centralized large-capacity inverters and line frequency transformers because of their simple structure and low installation cost [5][6][7]. The traditional structure of PV systems has achieved high efficiency and low cost.…”

A hybrid voltage‐current compensator using a synchronous reference frame technique for grid‐connected microgrid under nonlinear load conditions

“…Similarly, APFs have shown to be effective in reducing harmonics produced by non‐linear loads 8 . However, the existing SRF techniques for harmonic compensation based on PFs, APFs and hybrid approaches are costly and complex reasoning additional equipment 9 . Existing techniques for compensating unwanted harmonics using PI controllers mitigate either voltage harmonics assuming current to be sinusoidal 10‐13 or mitigate current harmonics assuming voltage to be sinusoidal 14,15 .…”

“…8 However, the existing SRF techniques for harmonic compensation based on PFs, APFs and hybrid approaches are costly and complex reasoning additional equipment. 9 Existing techniques for compensating unwanted harmonics using PI controllers mitigate either voltage harmonics assuming current to be sinusoidal [10][11][12][13] or mitigate current harmonics assuming voltage to be sinusoidal. 14,15 However, given the fact that voltage and current are correlated entities, these assumptions are not realistic and result in sub optimal controllers.…”

Investigating sine-band hysteresis control of photovoltaic-grid connected inverter

“…Hysteresis current control [9][10][11][12] has been proposed to satisfy these requirements. Other works proposed current control strategy [13,14] to provide balanced output current and reduce the Total Harmonic Distortion (THD), achieving unity power factor (UPF) [15], compensate for the harmonic current content of the grid current and microgrid without the use of any compensation devices [16], injection of balanced clean currents to the grid [17]. In this paper, efficiency of the system is considered as a major factor and the proposed system is build around practical  ISSN: 2088-8694 Int J Pow Elec & Dri Syst, Vol.…”