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In this paper, a distributed secondary control scheme is proposed to restore the frequency and voltage of droop-controlled inverter-based microgrid to their nominal values, and achieve the accurate active power sharing. The main advantage of the proposed distributed control scheme is that the secondary control objectives are achieved within a fixed-time independent of the initial conditions, which...
To make the Quasi-Z-source inverter applied in photovoltaic systems better, a flexible grid-connection method based on direct power control is proposed. The proposed method adopted grid power to control APF directly, thus the detection of harmonics and reactive current of loads is omitted. Moreover, space vector modulation (SVM) is adopted to keep switching frequency constant and improve dynamic performance...
A lot of research has been made on space vector modulation (SVM) strategy of matrix converter, but research on over modulation strategy of MC is almost blank. This paper analyzed conventional control theory of two-stage matrix converter, derived voltage transmission characteristic, then presented an over modulation method, which covered the entire over modulation range. The method was divided into...
A novel over modulation strategy for matrix converter (MC) is put forward on the basis of conventional AC/DC/AC MC control theory. First, fictitious AC/DC rectifier is over modulated to get the greatest dummy DC voltage, then a novel over modulation strategy was invented for the inverter side, which effectively enhanced voltage transfer ratio to 1.05 with good linearity. At last, the method was extensively...
A lot of research has been made on space vector modulation (SVM) strategy of matrix converter (MC), but research on over modulation strategy of MC is almost blank. This paper analyzed conventional control theory of dual-bridge MC, derived voltage transmission characteristic, then presented an over modulation method. At first, the rectifier is over modulated to get the greatest DC voltage, then the...
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