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Multistage systems are highly prone to issues of instability due to the interaction between converters. In this paper, the operation principles of a novel triple-phase-shift based dual active bridge converter are elaborated. Additionally, the impedance model of the cascaded system based on small signal analysis is proposed and applied for analyzing the stability of the cascaded system. The theoretical...
By modeling the typical electromechanical transient of grid-tied PWM inverters, this paper firstly proves that PWM inverters and Rotational Synchronous Generators (RSGs) are similar in physical mechanism and equivalent in mathematical model, and the concept of Static Synchronous Generator (SSG) is thereby developed. Furthermore, the rationality and feasibility of migrating the concepts, tools and...
This paper introduces a strategy to control a three phase voltage source inverter used in distributed generation in microgrids scenario. In this context, the inverter should operate in grid connected and islanded modes. Moreover, the transitions between these two states should be made in a seamless fashion. The proposed strategy is based on a two control loops scheme. Each loop provides a component...
Grid connected inverter can attenuate high frequency harmonics effectively through an LCL filter which has potential benefits for the inverter to get higher harmonic performance with lower switching frequency and less inductance in contrast with L filter. However, LCL filter is a third order system without damping and easy to resonate. In order to eliminate resonance and improve the system stability,...
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