This paper presents an improved dead-beat predictive direct power control strategy and new voltage vector sequences for reversible three-phase grid-connected voltage-source converters. It analyzes the rate of change of active and reactive power for each voltage vector in different sectors. The study found issues with the predicted duration times of conventional active vectors being less than zero. To address this, two alternative vector sequences are proposed, analyzed, and experimentally validated on a 1.5 kW reversible grid-connected voltage-source converter system.
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1. IMPROVED VOLTAGE-VECTOR SEQUENCES ON DEAD-BEAT
PREDICTIVE DIRECT POWER CONTROL OF REVERSIBLE THREEPHASE GRID-CONNECTED VOLTAGE-SOURCE CONVERTERS
ABSTRACT:
This paper presents a dead-beat predictive direct power control (DPC) strategy and its improved
voltage-vector sequences for reversible three-phase grid-connected voltage-source converters (VSCs). The
instantaneous variation rates of active and reactive powers, by applying each converter voltage vector in 12
different sectors, are deduced and analyzed. Based on the power variation rates, it is found that the values of
the predicted duration times for the two conventional active converter voltage vectors are less than zero
when the grid-connected VSC operates as either a rectifier or an inverter. In order to solve this issue, two
new alternative vector sequences are proposed and compared. Experimental results on a 1.5 kW reversible
grid-connected VSC system are presented to validate the feasibility of the proposed voltage-vector
sequences on the dead-beat predictive DPC strategy.
