Power Electronics Converter Topologies
Multi-level Active Neutral-Point Clamped (ANPC)

Multilevel converters have emerged in recent years as a very important alternative in the area of high-power medium-voltage energy control. The need for an increase in the power level of industrial applications is especially important in high power applications such as high power AC motor drives, active power filters, and renewable energies.

The term multilevel refers to the three-level topologies and above. The increase in the number of levels in the converter leads to harmonic distortion. Yet, as the number of levels increases so does the control complexity.

The most common multilevel topologies include the Neutral Point Clamped (NPC) converter (in its 3-Level version) and the Active Neutral-Point Clamped (ANPC) (in its 3-level and Multi-level versions), the T-Type, the Multicell topologies such as the Flying Capacitor (FC), the Stacked Multi-cell Converter (SMC).

Electrical schema

power converter topologies multi-level active neutral point clamped ANPC

Example of a Multi-level Active Neutral-Point Clamped (ANPC)

Conversion stage

  • DC/DC mono and bi-directional

  • DC/AC mono and bi-directional

Number of levels

  • Typical: 5
  • Max: 7

Intellectual Property

Patent US2007025126

Typical application and trends

  • Medium voltage drive up to 6.9kVAC
  • Medium voltage Solar up to 1500VDC

Advantages

  • Only 1 Flying Capacitor and 5 levels

Drawbacks

  • Extra switchesUnbalanced powerswitch losses (poor distribution)
  • Large commutation loops

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