Topology consideration

Topology consideration

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In addition to the two-level phase-leg based voltage source converter that has been the focus in prior chapters, there are many other widely used converter types in practical applications, such as current source converters and multilevel voltage source converters. For the fast WBG devices, their switching behavior becomes more susceptible to parasitics and noise of the application circuit. Therefore, the dynamic characterization results based on the conventional two-level phase-leg DPT, even considering the influence of three-phase system as discussed in Chapter 10, usually cannot match well with the actual switching performance in other non-two-level-phase-leg based topologies. This chapter aims at investigating the impacting factors on the switching performance originated from practical topologies that are not based on the simple two-level phase-leg configuration. The main focus here is the hard switching-based topology where the dynamic characteristics of devices would significantly affect the power converter performance. Two typical representatives, including current source converter and three-level active neutral-point clamped (ANPC) converter, are selected to understand the difference of switching commutation loop and the influence on the switching performance between these non-two-level-phase-leg based converters and the conventional two-level phase-leg based DPT. First, based on the typical modulation scheme, the switching commutation of each topology is analyzed. Accordingly, the switching loops are derived and compared with those in the conventional DPT. Considering more complicated topologies versus the conventional DPT circuit, the critical non-operating devices that are beyond the main switching commutation loop but will affect the switching performance of the operating switch are identified; and then their influence on the dynamic characterization is described. Finally, based on these case studies, a general discussion is given to summarize the impact of other non-two-level-phase-leg based topologies on the dynamic characterization.

Chapter Contents:

  • 11.1 Current source converter
  • 11.1.1 Switching commutation analysis
  • 11.1.2 Comparison of switching commutation loop with conventional DPT
  • 11.1.3 Consideration of other non-active devices
  • 11.2 Three-level ANPC converter
  • 11.2.1 Switching commutation analysis
  • 11.2.2 Comparison of switching loop with conventional DPT
  • 11.2.3 Consideration of other non-active devices
  • 11.3 Discussion and summary
  • References

Inspec keywords: semiconductor device testing; switching convertors; power semiconductor devices; wide band gap semiconductors; semiconductor device measurement

Other keywords: switching behavior; power converter performance; WBG devices; three-level active neutral-point clamped converter; modulation scheme; current source converter; dynamic characterization; double pulse test; power semiconductors; switching commutation loop; wide band gap devices; nontwo-level-phase-leg based topologies

Subjects: Power semiconductor devices; Power convertors and power supplies to apparatus; Power electronics, supply and supervisory circuits

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