A Novel Dynamic Switching Table Based Direct Power Control Strategy for Grid Connected Converters

Hany A. Hamed, Ahmed F. Abdou, Samrat Acharya, Mohamed Shawky El Moursi, E. E. El-Kholy

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Direct power control (DPC) has gained much attention for medium-voltage applications due to its fast power control capability. However, a conventional static switching table based DPC can lead to unsatisfactory response when the converter is connected to an electric grid because it is commonly designed assuming ideal and constant voltages of the grid and the dc link. Therefore, the actual grid voltage and the actual converter dc-link voltage should be considered while designing the switching table. This paper proposes a novel dynamic switching table for the DPC, considering actual grid and dc-link voltages variation. The proposed dynamic switching table incorporates a new definition of power influence crossover angles of each converter space vector. The proposed scheme dynamically adapts the switching table by feeding forward the actual grid and dc-link voltages, and hence the converter's power is precisely controlled. The proposed technique is verified for the three-level neutral point clamped converters connected to a standard IEEE 9-bus test system. Moreover, the real-time simulations are performed in a real-time digital simulator, OPAL-RT. The obtained results verified the effectiveness of the proposed DPC strategy under different grid fault scenarios.

Original languageBritish English
Article number8265095
Pages (from-to)1086-1097
Number of pages12
JournalIEEE Transactions on Energy Conversion
Volume33
Issue number3
DOIs
StatePublished - Sep 2018

Keywords

  • Direct power control
  • dynamic crossover angles
  • multilevel converters
  • network unbalance

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