Realizable Reference Antiwindup Implementation for Parallel Controller Structures

Cristina Gonzalez Moral,Fernando Briz,Daniel Fernandez,Juan Manuel Guerrero,Carlos Rivas Pereda,David Reigosa

doi:10.1109/jestpe.2020.3021035

Cristina Gonzalez Moral, Fernando Briz + Show 4 more

Open Access

https://doi.org/10.1109/jestpe.2020.3021035

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Abstract

Parallel controller structures are often used for the control of harmonic components in those power converters, including harmonic-compensation functions. The controlled signal can be distorted during the voltage saturation of the power converter output. This article proposes an implementation of the realizable reference antiwindup technique suitable for parallel controllers in multiple reference frames. The proposed implementation is simple and does not require a particular type of controllers nor special controller arrangements. The proposed implementation can be used for any kind of linear controller structure regardless of the variables being controlled. In the context of harmonic current controllers, the antiwindup implementation allows separating the harmonic controller outputs for canceling or decreasing them during steady-state saturation to improve the waveform quality. Different saturation options are analyzed for the inner loop current controller of grid-forming converter applications.

Highlights

Distributed power generation systems (DPGSs) have increased their presence in the grid, especially those based on renewable energies, like solar or wind energy [1]
Since the interface of DPGSs is generally based on power converters, this opens opportunities for harmonic compensation [6]
This paper develops and demonstrates a simple way of implementing the realizable reference anti-windup technique for parallel controllers in multiple reference frames

Summary

Introduction

Distributed power generation systems (DPGSs) have increased their presence in the grid, especially those based on renewable energies, like solar or wind energy [1]. Microgrids capable to operate independently of the grid are increasing in size and quantity [2]. In both cases, there is a high percentage of non-linear loads [3] injecting a significant amount of current harmonic content that eventually can distort the grid voltage. Since the interface of DPGSs is generally based on power converters, this opens opportunities for harmonic compensation [6]. Harmonic compensation increases the voltage and current controller complexity requiring parallel structures [1].

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Conclusion