Control of distributed photovoltaic inverters for frequency support and system recovery

Hossein Dehghanitafti, Georgios Konstantinou, John Edward Fletcher, Leonardo Callegaro, Glen Ghias Farivar, Josep Pou

Research output: Contribution to journalArticlepeer-review

Abstract

Replacing conventional synchronous generator-based power plants with inverter-based renewable energy resources results in a reduction of the inertia in power systems. To sustain the security and reliability of these low-inertia power systems, frequency support is increasingly required in new standards for grid-connected renewable energy resources, especially distributed photovoltaic (DPV) systems. This paper proposes a frequency droop-based control in DPV inverters to improve frequency response in power grids with high penetration of renewable energy resources. A predefined power reserve is kept in the DPV inverter, using flexible power point tracking. The proposed algorithm uses this available power reserve to support the grid frequency. Furthermore, a recovery process is proposed to continue injecting the maximum power after the disturbance, until frequency steady-state conditions are met. The positive inertia using the proposed recovery mode leads to recovery of the frequency in a shorter period. A composite load model of a distribution feeder, including DPV, is developed to assess the effectiveness of the proposed frequency support algorithm in power systems with high penetration of DPV inverters. The dynamic performance of the proposed frequency support algorithm with over-frequency and under-frequency events is also evaluated experimentally.

Original languageEnglish
JournalIEEE Transactions on Power Electronics
DOIs
Publication statusE-pub ahead of print - 26 Oct 2021

Keywords

  • Active power control
  • Australia
  • distributed photovoltaic systems
  • flexible power point tracking
  • Frequency control
  • Frequency response
  • frequency support
  • Heuristic algorithms
  • inertia provision
  • Inverters
  • low inertia power system
  • Power systems
  • Renewable energy sources
  • power electronics

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