Abstract
This paper proposes a new modeling method for power converter based on single arm model. The objective of this paper is twofold: (1) One is to present the single arm model with good portability. The single arm model can be used to build the models of power converters which have several arms with the same structure; (2) the other is that the converter model built by the single arm model can represent the power converter when open-circuit faults happened in power devices and clamping diodes. First of all, the inputs and outputs of single arm are redefined. Then, the open-circuit faults occurring in different power devices and clamping diodes are analyzed. Furthermore the single arm model is built. Finally, the model of power converter is established based on the single arm model, which can express the power converter with open-circuit fault. The effectiveness and accuracy of the proposed model have been verified by simulation and experiment results.
Highlights
Power converters are found in a vast number of applications, such as renewable energy conversion systems, power grids and high-speed trains [1,2,3]
Power converters often require uninterrupted operation. Such harsh work conditions may cause a series of problems, like parameter drift and component damage, which would eventually lead to deterioration of power devices performance
It is reported that about 38% of the faults in power converters are caused by the power devices faults [5]
Summary
Power converters are found in a vast number of applications, such as renewable energy conversion systems, power grids and high-speed trains [1,2,3]. If open-circuit faults in clamping diodes are considered, there will be thirteen kinds of operation modes for a single arm, such that the switching function-based method is inapplicable for the open-circuit fault modeling. In the latter one, the converter is equivalent to a controlled source which can be divided into state-space averaging method and dq-domain method [18,19,20]. The other is the uniformity, the model established by the proposed method can represent the converter in normal conditions and abnormal conditions that open-circuit faults occur in any power devices and clamping diodes.
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