Voltage-Modulated Direct Power Control for a Weak Grid-Connected Voltage Source Inverters

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Abstract

In this paper, we design a voltage-modulated direct power control (VM-DPC) for a three-phase voltage source inverter (VSI) connected to a weak grid, where the phase-locked loop (PLL) system may make the system unstable if the conventional vector current control (VCC) method is applied. Compared with the conventional VCC method, the main advantage of the proposed VM-DPC method is that the PLL system is eliminated. Moreover, in order to inject the rated real power to the weak grid, the VSI system should generate some certain amount of reactive power as well. An eigenvalues-based analysis shows that the system with the proposed method tracks its desired dynamics in the certain operating range. Both simulation and experimental results match the theoretical expectations closely.

Original languageEnglish
Article number8637819
JournalI E E E Transactions on Power Electronics
Volume34
Issue number11
Pages (from-to)11383-11395
Number of pages13
ISSN0885-8993
DOIs
Publication statusPublished - Nov 2019

Keywords

  • Voltage source inverter
  • Voltage modulated direct power control
  • Vector current controller
  • Weak grid
  • Stable system
  • weak grid
  • voltage-modulated direct power control (VM-DPC)
  • voltage source inverter (VSI)
  • vector current controller

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