KEPCO Journal on Electric Power and Energy

Korea Electric Power Corporation (한국전력공사)
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Calculation of Losses in VSC-HVDC based on MMC Topology

  • Kim, Chan-ki (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Lee, Seong-doo (KEPCO Research Institute, Korea Electric Power Corporation)
  • Received : 2018.07.19
  • Accepted : 2018.11.19
  • Published : 2018.12.30
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Abstract

VSC technology is now well established in HVDC and is, in many respects, complementary to the older Line Commutated Converter (LCC) technology. Despite the various advantages of VSC technology, VSC HVDC stations have higher power losses than LCC stations. Although the relative advantages and disadvantages are well known within the industry, there have been very few attempts to quantify these factors on an objective basis. This paper describes methods to determine the operating losses of every component in the valve of VSC-HVDC system. The losses of the valve, including both conduction losses and switching losses, are treated in detail.

Keywords

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Fig. 1. Half Bridge Submodule.

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Fig. 1. Half Bridge Submodule.

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Fig. 2. MMC (Modular Multi‐level Converter) Structure.

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Fig. 2. MMC (Modular Multi‐level Converter) Structure.

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Fig. 3. Typical IGBT and Diode on-state characteristics. (a) Real, (b) piecewise-linear approximation.

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Fig. 3. Typical IGBT and Diode on-state characteristics. (a) Real, (b) piecewise-linear approximation.

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Fig. 4. Conduction condition of IGBT and FWD.

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Fig. 4. Conduction condition of IGBT and FWD.

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Fig. 5. Submodule Conduction Operation. (a) Rectifier Mode, (b) Inverter Mode.(6)

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Fig. 5. Submodule Conduction Operation. (a) Rectifier Mode, (b) Inverter Mode.(6)

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Fig. 6. IGBT and Diode Conduction Period.

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Fig. 6. IGBT and Diode Conduction Period.

Table 1. Parameters used in Losses Calculation of VSC HVDC Station

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Table 1. Parameters used in Losses Calculation of VSC HVDC Station

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Table 2. Loss Calculation Result of VSC HVDC Station

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Table 2. Loss Calculation Result of VSC HVDC Station

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References

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