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With the rapid development of photovoltaic (PV) power generation, technology of the grid-connected photovoltaic system becomes an important part of the photovoltaic power generation. Based on this background, grid connection techniques of T-Type three-level grid-connected inverter with an LCL filter is studied in this paper. The subject combines SPWM modulation strategy and dual current loop control...
The power losses of switch device are disadvantages that restrict the performance of a converter. Sub-harmonics PWM (SHPWM) is applied in modulation of three-level neural-point-clamped (3L-NPC) converter most widely. This paper analyzes and compares the conduction losses and switching losses for 3L-NPC converter for different SHPWM strategies (PDSPWM, PDTHIPWM, PDSVPWM and PDSLRPWM). The principle...
This paper presented a detailed authentic simulation model of a permanent magnet synchronous motor control system based on the SimPowerSystems toolbox in Simulink library. We then focus on the periodic adaptive learning compensation (PALC) for cogging effect on PMSM position and velocity servo tasks. The cogging force is considered as a position-dependent disturbance that is periodic and not necessarily...
This paper introduces an optimization method of the selective harmonic elimination (SHE) technology using chaotic ant colony algorithm applied to neutral-point-clamped (NPC) three-level inverter. The method needs not to preset the initial values when solving the SHEPWM nonlinear and transcendental equations with ant colony algorithm. A scaleable chaotic search algorithm is embedded into a modified...
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