Improved Space Vector Modulation for Neutral-Point Balancing Control in Hybrid-Switch-Based T-Type Neutral-Point-Clamped Inverters With Loss and Common-Mode Voltage Reduction

Abstract

This paper compares different space vector modulation (SVM) strategies for neutral-point voltage balancing (NPVB) control in three-level (3-L) T-type neutral-point-clamped (TNPC) inverters, and proposes an improved SVM trimmed for NPVB control in hybrid-switch-based 3-L TNPC inverter with the features of loss and common-mode voltage (CMV) reduction. The proposed SVM strategy uses a new principle of small vector selection and vector sequence, and thus, it can balance the neutral point (NP) potential and achieve soft-switching of clamping leg simultaneously. The paper includes detailed analysis for circuit commutation mode, loss breakdown, and common-mode voltage patterns under different operation conditions. The circuit simulations and experiments are carried out in the last part of this paper to validate the proposed SVM strategy. Index Terms-Electromagnetic interference (EMI), neutralpoint (NP) voltage balance, Si-SiC hybrid switch, space vector modulation (SVM), T-type neutral-point-clamped (TNPC) inverter, wide bandgap (WBG) devices.

Thirteen-Level UXE-Type Inverter With 12-Band Hysteresis Current Control Employing PSO Based PI Controller

“…Otherwise, repeat from step 2. Now, THD =(THD) min (4) This equation definesthe objective function of the problem for PSO. The below mentioned equation generates the AC load voltage reference:…”

“…Now their applications has included electric vehicles and power conditioning units [1]- [2].In the MLIs, the switches voltage stressreduces to a considerable level, and the output voltage waveform with reduced THD is achieved [3]. Various popular and established multilevel inverters are NPC (neutral point clamped) [4], CHB (cascaded H bridge) [5] and FC (flying capacitor) multilevel inverter. In CHB-MLI, as the number of voltage levels increase, the number of isolated DC sources increases considerably.…”

A Simple Space Vector Modulation Method With DC-Link Voltage Balancing and Reduced Common-Mode Voltage Strategy for a Three-Level T-Type Quasi-Z Source Inverter

“…An SVPWM algorithm, including the impedance source shoot-through state for three-level converters, was developed in [39]. In [40], neutral point voltage control is addressed and in [41], the PWM algorithm considers a common-mode voltage reduction that is directly associated with leakage currents, being an important variable in transformerless inverters.…”

Genetic Algorithm Based PI Control with 12-Band Hysteresis Current Control of an Asymmetrical 13-Level Inverter

“…These converters can generate output voltages of the better harmonic spectrum and reduced THD levels through appropriate switching [3]. The conventional multilevel inverters are the neutral point clamped multilevel inverter (NPC-MLI) [4], cascaded H bridge inverter and flying capacitor multilevel inverter (FC-MLI). With the increase in the output voltage levels count, a number of the flying capacitors in FC-MLI, the number of the clamping diodes in NPC-MLI and the number of isolated DC sources in CHB-MLI increases considerably.…”