Programmable Electronic AC Load Based on a Hybrid Multi-Level Voltage Source Inverter

Zhi Geng, Dazhong Gu, Tianqi Hong, Dariusz Czarkowski

Research output: Contribution to journalArticle


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)
JournalIEEE Transactions on Industry Applications
StateAccepted/In press - Mar 20 2018



  • active load
  • Emulation
  • Harmonic analysis
  • Inductance
  • load emulator
  • multilevel converter
  • Power system harmonics
  • programmable electronic load
  • resonant controller
  • Switching frequency
  • three-phase symmetrical components
  • Topology
  • Voltage control
  • voltage source inverter

ASJC Scopus subject areas

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

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