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To stabilize the PV-connected grid with high penetration factor, the State formulates strict provisions on connecting the PV power stations into the power grid to ensure the safety of power system. On the basis of high-power PV power station LVRT technology, this paper elaborates the research on solving the inverter protection upon low-voltage operation by means of the control strategy under conditions...
As one kind of multilevel inverters, three-level inverter is widely used in the high-power and high-voltage applications. However, the increasing of the power devices improves the system's fault rate. How to ensure stable operation of the system has become an important research question. Through theoretical analysis and simulation on three-level high-power inverter, the paper analyses the working...
Based on a multi-module-cascaded multilevel inverter structure for the optimization of harmonics, this paper introduces a horizontal phase-shifting sinusoidal pulse width modulation (SPWM) strategy applied to multi-module-cascaded inverter, and at the same time, based on digital signal processor (DSP) and complex programmable logic device (CPLD), this paper also presents a digital algorithm for horizontal...
This study presents a novel means of designing a simple torque controller for Permanent Magnet Synchronous Motor (PMSM): a Lyapunov technique approach. The overall stability of the system is shown using Lyapunov technique. The Lyapunov functions used contain a term penalizing the integral of the tracking error, enhancing the stability. The tracking error is shown to be globally uniformly bounded....
This paper presents a novel fuzzy logic controller (FLC) for indirect vector control induction motor (IM) drive. The fuzzy logic speed controller is used in the speed loop. The 4 kW three-phase squirrel cage IM is fed by a current controlled voltage source inverter (CCVSI). The complete vector control scheme of the IM drive is implemented in real time using TMS320LF2812 digital signal processor. The...
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