Evaluation of three-phase neutral-point-clamped PFC rectifier implemented with isolated DC-DC converters for EV fast charger

Yıl 2024, Cilt: 30 Sayı: 4, 463 - 469, 30.08.2024

Merve Mollahasanoğlu , Hakkı Mollahasanoğlu , Halil Okumuş

Öz

In this study, a three-phase AC/DC neutral point clamped (NPC) power factor corrected (PFC) multilevel converter for off-board chargers of Electric Vehicles (EVs) is evaluated. The rectifier analysis has been tested by extensive simulations in combination with isolated DC-DC converters. This rectifier provides unity input power factor and efficiency above 96% for DC fast chargers rated at power levels up to 100 kW. The voltage ripple is below 0.5% for 800 Volt DC voltage. The current ripple is below 0.1% for 125 Ampere DC current. When the EV fast charger is evaluated with both isolated DC-DC converters, the NPC rectifier has less than 1% THD. This multilevel converter is highly efficient in terms of capacitor voltage balancing. The system has a simple control structure and does not require an extra PFC circuit. The converter operation and design calculations are presented with simulation studies. The simulation results of the system evaluated for isolated DC-DC converters demonstrate the validity and flexibility of the proposed charging system.

Anahtar Kelimeler

Battery charger, Electric vehicles (EVs), Multilevel converter, Neutral point clamped (NPC) converter, Power factor correction (PFC) converter, Power quality

EA hızlı şarj cihazi için izoleli DC-DC dönüştürücülerle uygulanan üç fazlı nötr noktadan sıkıştırılmış PFC doğrultucunun değerlendirilmesi

Öz

Bu çalışmada, Elektrikli Araçların (EA'lar) harici şarj cihazları için üç fazlı bir AC/DC nötr nokta kenetlemeli (NPC) güç faktörü düzeltilmiş (PFC) çok düzeyli dönüştürücü değerlendirilmektedir. Doğrultucu analizi, izole edilmiş DC-DC dönüştürücüler ile kapsamlı simülasyonlarla test edilmiştir. Bu doğrultucu, 100 kW'a kadar güç seviyelerinde derecelendirilen DC hızlı şarj cihazları için birlik giriş güç faktörü ve %96'nın üzerinde verimlilik sağlar. 800 Volt DC gerilimi için gerilim dalgalanması %0.5'in altındadır. 125 Amper DC akım için akım dalgalanması %0.1'in altındadır. EV hızlı şarj cihazı, her iki izole DC-DC dönüştürücü ile değerlendirildiğinde, NPC doğrultucunun harmoniği %1'den azdır. Bu çok seviyeli dönüştürücü, kapasite voltaj dengelemesi açısından oldukça verimlidir. Sistem basit bir kontrol yapısına sahiptir ve ekstra bir PFC devresi gerektirmez. Dönüştürücü çalışma ve tasarım hesapları benzetim çalışmaları ile sunulmuştur. İzoleli DC-DC dönüştürücüler için değerlendirilen sistemin benzetim sonuçları, önerilen şarj sisteminin geçerliliğini ve esnekliğini göstermektedir.

Anahtar Kelimeler

Batarya şarj cihazi, Elektrikli araçlar, Çok seviyeli dönüştürücü, Nötr nokta kenetlemeli (NPC) dönüştürücü, Güç faktörü düzelten (PFC) dönüştürücü, Güç kalitesi

Kaynakça

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