Voltage Regulation of Boost Converter Operating under Constant Power Load using Model Predictive Control

Öz

In this study, the design of a Model Predictive Controller (MPC) is presented to regulate bus voltage and enhance the stability of a DC/DC boost converter in a DC microgrid operating under Constant Power Load (CPL). The primary objective of this study is to develop a nonlinear control technique capable of effectively stabilizing power converters in the presence of CPL, which has the potential to cause significant instability issues. When designing the proposed control approach, it is crucial to consider the nonlinear nature and negative impedance characteristics of CPL. The MPC controller aims to mitigate the instability problems caused by CPL directly connected to a DC/DC boost converter. The proposed controller design ensures that the output voltage follows the predefined reference value, regardless of whether the system operates in continuous or discontinuous current mode. To demonstrate the effectiveness of the designed controller, comparative simulation studies have been conducted. In these simulations, performed using MATLAB/Simulink, the obtained results confirm that the DC bus voltage remains stable at the desired reference value. Furthermore, comparative simulation results were obtained and evaluated to compare the performance of MPC with a conventional PI controller. The simulation results indicate that MPC achieves significantly better tracking of the reference DC bus voltage compared to the conventional PI controller.

Anahtar Kelimeler

• Model predictive controller
• Constant power load
• PI controller
• DC/DC boost converter

Model Tahmini Kontrol Kullanılarak Sabit Güç Yükü Altında Çalışan Yükseltici Konvertörün Gerilim Düzenlemesi

Öz

Bu çalışmada, Sabit Güç Yükü (CPL) altında çalışan bir DC mikro şebekesinde bara voltajını düzenlemek ve DC/DC yükseltici dönüştürücünün kararlılığını artırmak için bir Model Tahmini Denetleyici (MPC) tasarımı sunulmuştur. Bu çalışmanın birincil amacı, önemli istikrarsızlık sorunlarına neden olma potansiyeline sahip CPL varlığında güç dönüştürücülerini etkili bir şekilde stabilize edebilen doğrusal olmayan bir kontrol tekniği geliştirmektir. Önerilen kontrol yaklaşımını tasarlarken, CPL'nin doğrusal olmayan doğasını ve negatif empedans özelliklerini dikkate almak çok önemlidir. MPC denetleyicisi, doğrudan bir DC/DC yükseltici dönüştürücüye bağlanan CPL'nin neden olduğu istikrarsızlık sorunlarını azaltmayı amaçlamaktadır. Önerilen denetleyici tasarımı, sistemin sürekli veya süreksiz akım modunda çalışmasına bakılmaksızın çıkış voltajının önceden tanımlanmış referans değerini takip etmesini sağlar. Tasarlanan denetleyicinin etkinliğini göstermek için karşılaştırmalı simülasyon çalışmaları yürütülmüştür. MATLAB/Simulink kullanılarak gerçekleştirilen bu simülasyonlarda, elde edilen sonuçlar DC bara voltajının istenen referans değerinde kararlı kaldığını doğrulamaktadır. Ayrıca, karşılaştırmalı simülasyon sonuçları elde edildi ve MPC'nin performansını geleneksel bir PI kontrolörüyle karşılaştırmak için değerlendirildi. Simülasyon sonuçları, MPC'nin geleneksel PI kontrolörüne kıyasla referans DC bara geriliminin önemli ölçüde daha iyi izlenmesini sağladığını göstermektedir.

Anahtar Kelimeler

• Model öngörücü denetleyici
• Sabit güç yükü
• PI denetleyici
• DC/DC yükseltici dönüştürücü

Kaynakça

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