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This paper presents a comparison of two DC-bus voltage balancing strategies for cascaded connected H-bridge converter-based STATCOMs. These converters have classically been commutated at fundamental line-frequencies, but the evolution of power semiconductors has allowed the increase switching frequencies and the power ratings of these devices, permitting the use of PWM modulation techniques. This...
This paper presents a novel Voltage Balancing PWM modulation strategy for Cascaded H-Bridge multilevel converters. These converters have been classically commu-tated at fundamental line-frequencies, but the evolution of Power Semiconductors has allowed to increase switching frequencies and the power ratings of these devices, permitting the use of PWM modulation techniques. This paper presents a new...
This paper deals with the Predictive Direct Power Control of MV-grid-connected two-level and three- level NPC converters. The well-known direct power control is combined with a predictive selection of a voltage-vectors sequence, obtaining both high transient dynamic and constant switching frequency on high-power converters. The initial Predictive Direct Power Control proposal explored only the basic...
This paper deals with an improvement of the predictive direct power control (P-DPC) for MV three-level NPC converters. Contrary to the previously developed P-DPC strategy, the proposed approach combines a symmetrical 3+3 voltage vectors' sequence for the steady-sate operation with a simple two voltage vectors' sequence for transient requirements. Simulations of the proposed hybrid algorithm are compared...
This paper proposes the predictive direct power control (P-DPC), a new control approach where the well-known direct power control (DPC) is combined with a predictive selection of a voltage-vectors sequence, obtaining both high transient dynamic and constant switching frequency. Two different P-DPC versions are developed based on two different types of voltage sequences: a two-vector one and a three-vector...
This paper presents a new control method for cascaded connected H-bridge converter based STATCOMs. These converters have been classically commutated at fundamental line-frequencies, but the evolution of power semiconductors has allowed to increase switching frequencies and the power ratings of these devices, permitting the use of PWM modulation techniques. This paper mainly focuses the DC bus voltage...
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