New Space Vector Modulation Technique for Single-Phase Multilevel Converters

Abstract

Abstract-Single-Phase multilevel converters are suitable for medium power applications as photovoltaic systems and switched reluctance machines. An overview of possible modulation methods including carrier-based Pulse Width Modulation and Space Vector Modulation techniques for multilevel single-phase converters is presented. A new space vector modulation for this type of converters is proposed. This space vector modulation method is very simple presenting low computational cost. Different solutions for the space vector modulation are presented achieving similar output results but imposing restrictions on the power converter topology. Optimization algorithms balancing the DC-Link voltage or minimizing the commutation losses are presented. Experimental results using a 150 kVA five-level diodeclamped converter are shown to validate the proposed modulation and optimization methods.

Multilevel Multiphase Space Vector PWM Algorithm

“…and if (19) and (20) are compared, the following relationship between the fractional part of the reference and the displaced switching vectors is obtained:…”

“…The method introduced in [17], for threephase inverters with neutral, was later extended to four-wire topologies in [18]. Recently, in [19], a new SVPWM method for single-phase converters has been presented. With regard to multilevel multiphase SVPWM, an algorithm for a neutral clamped five-phase inverter was proposed in [20].…”

Germany's new code for generation plants connected to medium-voltage networks and its repercussion on inverter control

“…As explained by Leon in [4], Space Vector Modulation (SVM) where the reference vector, generated by an external control strategy, is represented in a vectorial diagram and is composed as a linear combination of the possible state vectors of the power converter. Nearest Three Vectors (NTV) technique is normally used in three-phase systems determining the three nearest vectors to the reference one [5] [6].…”

Performance evaluation of SiC MOSFET in 5-level single phase converter

“…Capacitor voltage balancing control ensures the voltage at the midpoint of C1 and C2 is stable and uses adapted form of space vector modulation typically employed in single phase drive systems [2].…”