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Uninterruptible power supply (UPS) is the promising candidate to ensure high quality of delivering power from renewable energy resources to the AC loads especially sensitive and critical ones. In this study, optimised harmonic elimination modulation technique is extended to four-leg neutral-point-clamped (NPC) with neutral point voltage balancing and it has been experimentally validated. It is demonstrated...
In this paper the selective harmonic elimination pulse width modulation (SHE-PWM) technique is proposed to control the three-level four-leg neutral point clamped (NPC) inverter in order to have both advantages of low switching frequency of SHE and neutral point of fourth leg in four wire systems. In this proposed method, the obtained switching angles of inverter phase legs are used to eliminate the...
In this paper, a selective harmonic mitigation (SHM) strategy based on the pulse width and amplitude modulation (PWAM) concept has been proposed for three-phase four-leg shunt active power filters (APF). The pulse amplitude modulation (PAM), which is mainly used in communication systems, is applied simultaneously with the PWM to the three-phase four-leg inverter. This leads to an increase in the system...
In this paper, a closed-loop control scheme with the SHM-PWAM strategy for three-phase four leg inverters has been proposed. The complexity of proposed control strategy is low for implementation. Recently developed PWAM strategy, is applied to the three-phase four-leg inverter. This leads to an increase in the system degrees of freedom in mitigating more harmonics compared to the conventional PWM-based...
Compared to the conventional selective harmonic elimination-pulse width modulation (SHE-PWM), the selective harmonic elimination-pulse width and amplitude modulation (SHE-PWAM) control strategy results in significant improvements in the performance of CHB inverters. This fact is due to considering the optimization of the CHB dc sources' values along with the optimized switching angles. This paper...
In this paper, a selective harmonic mitigation pulse width and amplitude modulation (SHM-PWAM) control strategy, for three-phase four-leg inverters has been proposed. In this way, the pulse amplitude modulation (PAM), which is mainly used in communication systems, is applied simultaneously with the pulse width modulation (PWM), to the three-phase four-leg inverter. Considering PAM increases the system...
In this paper, a modulation strategy based on the circuit-level decoupling concept is proposed and investigated for the three-level four-leg neutral-point-clamped (NPC) inverter, with the aim of delivering power to all sorts of loads, linear/nonlinear and balanced/unbalanced. By applying the proposed modulation strategy, the four-leg NPC inverter can be decoupled into three three-level Buck converters...
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