Diagnosis method for active power filter switching device open-circuit fault based on model reference analysis
A power filter, open-circuit fault technology, applied in the field of open-circuit fault diagnosis of three-phase three-wire active power filter switching devices, can solve the problems of long detection time, large amount of calculation, complex algorithm calculation, etc. , the algorithm is simple, the diagnosis accuracy rate is high
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[0083] In this embodiment, A-phase T of APF 1 Take an open circuit fault as an example, before 0.1s, the APF operates normally; after 0.1s, T 1 An open circuit fault has occurred. When the APF is running normally, its main circuit topology is as follows: figure 1 Shown; Phase A of APF T 1 When an open circuit fault occurs, the topology of the main circuit of the APF is as follows: figure 2 Shown; Experimental parameters are shown in Table 1.
[0084] Table 1. Experimental parameters
[0085]
[0086] The first step is to establish the relationship formula between the terminal voltage and the compensation current in the main circuit of the APF, and then transform it into the actual operation model under the d-q synchronous rotating coordinate system; then use the model parameters and the same input signal as the normal operation to construct reference model;
[0087] Step 1: According to such as figure 1 The APF topology shown in the figure establishes the mathematic...
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