ESO-based Backstepping Control of DC-DC Buck Converter Under Mismatched load Disturbance

Abstract

The DC–DC power converter play a critical role to provide stable DC output voltage, however which is subject to various uncertainties and disturbance in supplying the sensitive loads. This paper propose a composite backstepping control strategy with extended state observer (ESO) for buck converter. Firstly, a backstepping control function is constructed to derive an inner current loop reference assuming load disturbance is known, which renders global stability of the system. An ESO is designed to estimate the mismatched load current and feedforward it to the backstepping controller to obtain disturbance rejection. Quantitative selection of control and observer gains are provided under highly nonlinear relationship of system dynamics. Rigorous stability of proposed scheme are poved with analysis of robustness. Finally, simulation results illustrate the effectiveness of the proposed control scheme in the presence of load disturbance and uncertainties

Keywords

• Backstepping
• Buck Converter
• Uncertainty
• Observer

DA-DA Alçaltan Dönüştürücülerin Uyumsuz Bozucu Yük Altında GDG Tabanlı Geri Adım Kontrolü

Abstract

DC alçaltan dönüştürücüler dalgalanmayan DC yük gerilimi sağlamada kritik bir rol oynar, bununla birlikte hassas yükler altında çalışırken çeşitli parametrik belirsizliklere ve bozucu etkilere maruz kalmaktadır. Bu çalışmada alçaltan tip dönüştürücüler için genişletilmiş durum gözlemleyicisi (GDG) ile birlikte geri-adım kontrol stratejisini içeren tümleşik bir kontrol yapısı önerilmektedir. İlk olarak, sistemin genel kararlılığını sağlayan ve yük bozulmalarının bilindiği varsayılarak iç akım döngüsü referansı üretmek amacıyla bir geri-adımlama kontrol fonksiyonu oluşturulur.Daha sonra, eşleşmeyen yük akımını tahmin etmek ve bozulmayı azaltmak için geri adımlama denetleyicisi ile işbirliği yapmak üzere bir GDG tasarlanmıştır. Kontrol ve gözlemci kazançlarının seçimi, sistem dinamiklerinin doğrusal olmayan ilişkileri altında sağlanmıştır. Önerilen kontrol yapısının kesin kararlılığı, gürbüzlük analizi ile birlikte sağlanmıştır. Son olarak, önerilen kontrol yöntemi için yükün ve belirsizliklerin neden olduğu bozulmalara karşı karşılaştırmalı performansını gösteren simülasyon sonuçları verilmiştir.

Keywords

• Geri-adım
• Alçaltan dönüştürücü
• Belirsizlik
• Gözlemleyici

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