A Novel Space Vector Modulation Scheme for a 10-Switch Converter

Abstract

Three-level converters have drawn extensive attention due to their ability to deliver high-quality power. High semiconductor count is the main drawback of three-level converters. As a solution to this, a 10-switch converter is presented, that has advantages over both two- and three-level converters, simultaneously, plus it is applicable to a variety of power ranges. However, the switching pattern of 10-switch converter is not as simple as standard three-level converter due to lack of medium vectors. This paper presents a novel space vector modulation (SVM) for a 10-switch converter to reduce total harmonic distortion (THD) and common mode voltage (CMV) of this converter in comparison to prior carrier-based modulation methods. A simplified, low-cost modulation algorithm for the converter is proposed. The designed switching sequence has aimed at a low output THD and enhancement of DC bus voltage utilization. The performance of the proposed SVM is then compared to upgraded sinusoidal PWM. AC power quality and CMV of a 10-switch converter based on two modulation methods are investigated via simulation models. It was validated via simulation and experimental models that the proposed SVM utilized DC bus voltage more efficiently, generated remarkably less THD compared to other methods, and had a lower peak and rms CMV.

Topology Review of Three-Phase Two-Level Transformerless Photovoltaic Inverters for Common-Mode Voltage Reduction

“…Compared with CSIs, the VSIs will be more dominant in the PV-grid-connected inverter systems because of their advantages of easy control, cost-effectiveness, and being a mature technology [42][43][44][45][46][47][48][49][50][51][52]. However, the traditional three-phase two-level voltage-source H6 inverter cannot provide the boost capability.…”

“…In order to suppress the leakage current, the common mode voltage should be reduced or kept constant. To reduce the CMV for the traditional three-phase two-level H6 VSIs, both the PWM control methods [30][31][32][33][34][35][36][37][38] and system topology reconfiguration [42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57] are introduced. In addition, the solutions for the CMV reduction of the impedance-source inverter topologies were also developed.…”

“…In the improved H8 topology, the CMV during zero states is kept constant at 2V PN /5, while it varies from V PN /3 to 2V PN /3 in the active states. In [48,49], the H10 topologies and corresponding modulation scheme with omitting zero vectors were introduced to keep the constant CMV. Moreover, a constant CMV can be given by adding a zero-voltage-state rectifier module to the H6 inverter [50].…”

Hybrid Four-wire Three-Level Inverter Equipped with Model Predictive Control for UPS Applications

“…where v e (i) is the voltage prediction error, which is defined in (10), ξ lim (i) presents the current constraint, which is shown in (11), and switching effort (SW ) with a weighting factor (ζ w ) can be expressed as given in (12).…”

“…Ref. [11] presented a novel space vector modulation (SVM) for a 10-switch converter in three wire applications to reduce total harmonic distortion (THD) and common mode voltage (CMV). However, 10 switch inverter has not been used for four wire applications, and developing of control scheme and three denominational switching modulator are challenging issues.…”