Harmonics Reduction and Reactive Power Injection in Wind Generation Systems

Francisco Emilio Rodarte Gutiérrez,Luis Gerardo González Morales,Rubén Ortega González,Jaime José Rodríguez Rivas,Oscar Carranza Castillo,Edgar Peralta Sánchez

doi:10.3390/electronics10161964

Francisco Emilio Rodarte Gutiérrez, Luis Gerardo González Morales + Show 4 more

Open Access

https://doi.org/10.3390/electronics10161964

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Abstract

In this work, methods are implemented to improve two aspects of energy quality in a wind generation system. First, the harmonic reduction is achieved by applying a linear control technique in the Grid Side Converter; and second, the power factor of the wind generation system using a Doubly Fed Induction Generator (DFIG) is adjusted by injecting reactive power. The reduction of the harmonic content is performed with a digital resonant controller, which tracks the periodic signals corresponding to the current harmonics of the Grid Side Converter (GSC), which is part of a “back to back” converter in a wind generation system. This technique allows implementing a current controller of the GSC with a high level of rejection of current harmonics, of frequencies with orders (1 + 6k) and (1 − 6k) (where k is an integer), when executed in the synchronous reference frame (dq). The purpose of this work is to inject currents to the grid with very low harmonic distortion and provide a method for tuning the resonant controller for a simple L filter; also, the GSC is used to generate reactive power. These two improvements achieve a unity power factor, and this is necessary to comply with the new codes where a leading power factor helps regulate the grid voltage.

Highlights

For many nations, maintaining an energy mix with a wide diversity of sources is a necessary key to achieve energy independence, which allows nations to avoid import energetics
Import energetics create risky situations when the global energy supply chain fails, which will be relevant as the demand increases again as activities resume under the “new normality” resulting from the COVID–19 global pandemic [1]
Some of the most significant applications are in Permanent Magnet Synchronous Generators (PMSGs), whose scheme uses an electronic converter to perform the power and speed control, as well as to interconnect to the grid, operating at variable power and speed instead of working whose scheme uses an electronic converter to perform the power and speed control, as well as to interconnect to the grid, operating at variable power and speed instead of working synchronized to the grid [3]

Summary

Introduction

For many nations, maintaining an energy mix with a wide diversity of sources is a necessary key to achieve energy independence, which allows nations to avoid import energetics (such as fuel and electric power transmission from neighboring countries). Some of the most significant applications are in Permanent Magnet Synchronous Generators (PMSGs), whose scheme uses an electronic converter to perform the power and speed control, as well as to interconnect to the grid, operating at variable power and speed instead of working whose scheme uses an electronic converter to perform the power and speed control, as well as to interconnect to the grid, operating at variable power and speed instead of working synchronized to the grid [3]. Another example is the Doubly Fed Induction Generator (DFIG) that is studied in this work, where the stator is directly connected to the grid, and the control is done with a “back to back” converter connected to the rotor and the ogfr1i6d

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