Programmable Electronic AC Load Based on a Hybrid Multilevel Voltage Source Inverter

Zhi Geng, Dazhong Gu, Tianqi Hong, Dariusz Czarkowski

Research output: Contribution to journalArticlepeer-review


A programmable electronic load (PEL) solution is usually needed for comprehensive testing of power supplies. In this paper, a novel PEL based on a hybrid five-level voltage source inverter (VSI) is introduced to emulate a variety of static load behaviors, such as R, L, C loads, high-frequency harmonic loads, and unbalanced loads. Dynamic load behavior, for example, modulation loads, can also be achieved in this paper. A dedicated control structure is proposed for the emulation of different load behaviors and the detailed compensator design is presented to evaluate the system dynamic performance. The proposed PEL system has isolated active dc links to support multilevel converter topology, and it can either dump the energy to a passive load or recycle the energy back to the utility grid through another VSI. Simulation and experimental results are provided to validate the effectiveness of proposed control methods in terms of successfully achieving a variety of load profile functions.

Original languageEnglish (US)
Article number8320809
Pages (from-to)5512-5522
Number of pages11
JournalIEEE Transactions on Industry Applications
Issue number5
StatePublished - Sep 1 2018


  • Active load
  • load emulator
  • multilevel converter
  • programmable electronic load (PEL)
  • resonant controller
  • three-phase symmetrical components
  • voltage source inverter (VSI)

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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