Two-way dual-buck inverter with online fault diagnosis function and working method of inverter

Abstract

The invention discloses a two-way dual-buck inverter with an online fault diagnosis function and a working method of the inverter. A system comprises the inverter, a sampling circuit, an isolation drive circuit and a controller, wherein the controller reads target input and output values on the basis of a two-way working mode, determines operation parameters for target prediction on the basis of MPC, determines predicted cost values for targets respectively, selects the optimal target value among possible target values according to the cost values and sets the target value; the controller adjusts output according to the set target value to control a power switch tube of the inverter. The controller performs fault judgment, including threshold judgment and residual judgment, according to data analysis, feature extraction and feature fusion to complete fault alarming and positioning. The system is quick in response, real-time and high in reliability, little input is required during diagnosis, no additional detection circuit is needed, faults of an inverter system can be quickly diagnosed and positioned, the operation environment of a direct current micro-grid can be effectively improved, and safe and reliable operation of the system can be ensured.

Description

technical field [0001] The invention relates to the technical field of bidirectional power electronic converters, in particular to a bidirectional double-buck inverter with online fault diagnosis and a working method thereof. Background technique [0002] Problems such as environmental degradation and energy shortage have prompted the power industry to actively seek breakthroughs in energy construction. In recent years, my country has continuously reduced carbon emissions in the power industry and vigorously promoted the development of renewable energy and new energy. In order to adapt to the national new energy development strategy and fully develop and utilize distributed power sources, various distributed power The microgrid is connected to the grid and operated in parallel, which can efficiently utilize distributed power. [0003] As a new type of high-efficiency new energy architecture, the microgrid gathers distributed power sources, related loads, power electronic con...

AI Technical Summary

Problems solved by technology

As the key equipment in the energy system, the inverter is often a relatively weak link, and the loss caused by device failure is huge.

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