Review on Multi Level Inverter Topologies and Control Strategies for Solar Power Conversion

Abstract

Nowadays solar power has become an alternate method of power generation for standalone systems for both urban and rural electrification. The Power Electronics converters used for the power conversion should provide quality AC output to have near sinusoidal voltage. The inverter topology and the PWM technique of the inverter play a vital role in providing quality output. This paper reviews recent contribution to establish the current status and development of the technology to provide reader with an insightful review of multilevel inverters and its control strategy. A brief overview of Multi Level Inverters (MLI) topology and advantages of Cascaded H-Bridge Multi Level Inverter (CHBMLI) for solar power conversion is presented and the various control strategies for CHBMLI are discussed with view point of quality output. Among the different PWM techniques discussed, the Elliptical Multi Carrier PWM (EMC PWM) control strategy is the new modulation technique which successfully improves the DC bus utilization without over-modulation and without adding third harmonic to fundamental frequency. Also, the technique is successful in reducing the %THD at the output voltage. The control strategy is simple even with increased level of output voltage, which is not possible in SVPWM technique. Hence, the EMC PWM technique is having better performance when compared to Multi Carrier PWM (MCPWM) technique, Space Vector PWM (SVPWM) technique and Third Harmonic Injection PWM (THIPWM) technique.

Harmonics Elimination in 7-Level Multilevel Inverter Using Animal Migration Optimization Algorithm with Different Objective Functions

“…Fundamental switching frequency techniques can be broken down into a few categories: space vector control, SHEPWM, and optimal switching method. Techniques such as sinusoidal pulsewidth modulation and space vector modulation fall within the category of high switching frequency methods [5], [7], [33]. The fundamental switching frequency approaches allow for the creation of energy conversion systems that are both low-cost and highly efficient.…”

“…Meanwhile, low frequency switching includes Optimal Switching Angle (OSA), Selective Harmonic Elimination (SHE) PWM, Space Vector Control (SVC), and Nearest Level Control (NLC) [5]- [7]. SHEPWM, a low frequency technique, has recently gained popularity [8]- [10].…”

Literature Review Metode Reduksi Harmonisa Berbasis Kecerdasan Buatan pada Multilevel Inverter

“…Berdasarkan [4]- [6], MLI memiliki tiga topologi dasar yang banyak digunakan saat ini, yaitu Neutral Point Clamped Multilevel Inverter (NPC-MLI), Cascaded H-Bridge Multilevel Inverter (CHB-MLI), , dan Flying Capacitor Multilevel Inverter (FC-MLI). Keuntungan dari MLI adalah [7]- [9]: tegangan rendah pada komponen saklar daya, pengurangan Total Harmonic Distortion (THD) pada tegangan keluaran, Interferensi Elektromagnetik (EMI) rendah, beroperasi pada frekuensi penyaklaran yang lebih tinggi dan frekuensi fundamental, serta pengurangan ukuran filter . Meskipun lebih baik dari inverter konvensional, MLI yang beroperasi pada frekuensi rendah masih mengandung harmonisa orde rendah pada tegangan dan arus keluaran yang berdampak negatif pada sistem kelistrikan.…”

“…FC-MLI mirip dengan NPC-MLI. Satu-satunya perbedaan adalah bahwa dibandingkan menggunakan dioda, clamping dilakukan dengan menggunakan kapasitor [7], [18]. Kapasitor di sisi DC terhubung mirip dengan struktur tangga, di mana tegangan berbeda di setiap kapasitor dan kapasitor berikutnya.…”

Pengiriman Daya dari Inverter Lima Tingkat ke Grid Satu Fasa Menggunakan Arduino Due

“…Inverter sumber tegangan bertingkat secara luas terdiri dari tiga kelo mpok utama yaitu inverter bertingkat-dioda atau konverter multi-jep it [10], inverter bertingkat-kapasitor atau inverter mult i-sel [11], dan cascade inverter atau H-bridge bertingkat [12]. Setiap kelo mpok memiliki kontrol yang berbeda [13]. Kontrol yang d igunakan dapat berupa unipolar atau bipolar [14].…”