Grid Photovoltaic Power System Fault Diagnosis Based On Fault Tree

In recent years, solar energy, which is concerned with its free-pollution rich-resource and short construction cycle, is caused by the widespread concern of the countries in the world. The electromagnetic interference becomes very important for using power electronic device in solar photovoltaic grid-connected power system. Fault diagnosis, which is caused by the system, has become the focus of attention of researchers.In this paper, against the electromagnetic compatibility of grid-connected photovoltaic power generation system, study the diagnosis caused by the electromagnetic interference system failure and the method of eliminating the failures.First, analysis the grid-connected photovoltaic power generation system and the type of electromagnetic interference and the causes.Then, introducing the theory of fault tree (Fault tree analysis, FTA). The theory is a new method of fault diagnosis, and using this theory analyzes failures caused by grid-connected photovoltaic power system electromagnetic interference. Another way of saying, this paper presents a new method to solve the fault caused by electromagnetic compatibility, which is the fault tree analysis. First application of this theory to build a grid-connected photovoltaic power generation system fault tree and the various subsystems of corresponding fault tree. And then qualitative analysis of the minimal cut sets for solving grid-connected photovoltaic power generation system fault tree, and all possible faulty combinations need to be considered by the minimal cut sets, which can be determined by the system. The identified failure efficiency ratio can be obtained through quantitative analysis. Based on this identified fault efficiency, the best sort can be established by the fault diagnosis.Next, the paper studied the6KVA grid-connected photovoltaic inverter, anti-interference system to further design, further anti-interference of the system design, including system grounding, shielding, and etc. The paper analyzed the mechanism of harmonic generation in inverter system detailed. In order to reach its high-order harmonic suppression effect, the writer designed an active power filter (Active power filter, APF), which is simulated by Matlab simulation of the design of active power filter. We can be seen good results from the results obtained.