Abstract
Active ripple decoupling technique of single-phase inverter is a popular topic to minimize the dc-link capacitance. However, the existing control methods are based on tracking sinusoidal or predetermined voltage waveform of compensation capacitor, where they assume the inverter outputs are pure sinusoidal voltage and current. Therefore, the performance of existing methods degrades when the inverter output voltage and current are not purely sinusoidal. Furthermore, the limited dynamic performance threatens the safety of dc-link capacitor when the load changes, because the inrush ripple power is injected into dc link with small capacitance and the dc-link voltage will suddenly rise up when the ripple power is not buffered during transients. In this paper, a direct instantaneous power predictive control is proposed to buffer ripple power of single-phase inverter, which combines instantaneous ripple power control with model predictive control to overcome the issues above. The proposed method tracks instantaneous ripple power rather than voltage or current waveform. In this way, it can fully buffer all ripple powers in the system even for distorted output voltage and current of the inverter; the voltage waveform of the capacitor has the different shape in different operation cases, which enables the full utilization of storage capacitor. Model predictive control makes the proposed method have fast dynamic and perfectly compensate ripple power during transients and steady states. The buck-type active ripple decoupling circuit is chosen by comparing with another typical topology to implement the proposed method. Simulation and experimental results on a 3-kW prototype verify the theoretical analysis and the proposed control method.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.