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This paper discusses the active and reactive power control method for a modular multilevel converter (MMC) based grid-connected PV system. The voltage vector space analysis is performed by using average value models for the feasibility analysis of reactive power compensation (RPC). The proposed double-loop control strategy enables the PV system to handle unidirectional active power flow and bidirectional...
A particle swarm optimization (PSO) algorithm-based staircase modulation strategy for modular multilevel converters (MMC) is proposed. To reduce switching losses and device stress, the staircase modulation method has been adopted in high-voltage and high-power energy conversion applications. In particular, the selection of the appropriate iterative initial values of switching angles is a significant...
In this paper, the operation principle of the Z-source inverter is analyzed in detail. According to the characteristics of allowed short-shrougt zero state in the Z-source inverter, SPWM control method of the Z-source inverter is obtained by inserting fixed short-shrougt zero state into zero state of SPWM. It is simple and easily implemented in practice. However, in inductive load condition the output...
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