Composite robust control method of high-frequency SiC photovoltaic grid-connected inverter under weak power grid

Abstract

The invention relates to a composite robust control method of a high-frequency SiC photovoltaic grid-connected inverter under a weak power grid. A reference value of a current loop is obtained throughcalculation by designing parameters of an LCL filter; the power density of the high-frequency SiC photovoltaic grid-connected inverter is improved, grid-connected current is fed back, an active damping feedback function H<ad>(s) is designed, and an open-loop transfer function G<open>(s) of the high-frequency SiC photovoltaic grid-connected inverter is determined; and a power grid voltage feed-forward function is improved, a first-order low-pass filter is configured, a new power grid voltage transfer function G<v>(s) is obtained, an odd number of repeated quasi-PR current controllers are usedfor restraining harmonic waves of all orders, modulation waves u<[alpha][beta]><*> are obtained, and an SVPWM module obtains switch driving signals to be used for driving a SiC switch tube. Accordingto the method, no extra sensor is needed, and the second-order differential link and the proportional link are adopted to jointly achieve power grid voltage feedforward so as to eliminate the influence of weak power grid impedance on the stability of the high-frequency inverter.

Description

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Login to view more

AI Technical Summary

Benefits of technology

This patented technology describes an improved way for reducing electrical noise interference between different electronic devices connected together through wires or cables. It achieves this by introducing Active Dampening (AD) methods that can effectively reduce unwanted signals from nearby sources without adding extra equipment like filters. By considering these issues, it provides technical benefits such as increased efficiency at higher frequencies while minimizing impacts upon other components' performance.

Problems solved by technology

This patented technical solution describes how to improve the efficiency and reliancy of solar cells' ability to operate under varying conditions due to changes caused from external factors like weather patterns over time. By measuring the electrical properties of the cell itself during its manufacture process, we aim to ensure consistently good results for different types of applications where these variations affect the overall functioning of the battery.

Images