Power Control Flexibilities for Grid-Connected Multi-Functional Photovoltaic Inverters

Yongheng Yang, Frede Blaabjerg, Huai Wang, Marcelo Simoes

Research output: Contribution to journalJournal articleResearchpeer-review

115 Citations (Scopus)
676 Downloads (Pure)


This study explores the integration issues of next-generation high-penetration photovoltaic (PV) systems, where the grid is becoming more decentralised and vulnerable. In that case, the PV systems are expected to be more controllable with higher efficiency and reliability. Provision of ancillary and intelligent services, such as fault ride-through and reactive power compensation, is the key to attain higher utilisation of solar PV energy. Such functionalities for the future PV inverters can contribute to reduced cost of energy, and thus enable more cost-effective PV installations. To implement the advanced features, a flexible power controller is developed in this study, which can be configured in the PV inverter and flexibly change from one to another mode during operation. Based on the single-phase PQ theory, the control strategy offers the possibilities to generate appropriate references for the inner current control loop. The references depend on system conditions and also specific demands from both system operators and prosumers. Besides, this power control strategy can be implemented in commercial PV inverters as a standardised function, and also the operation modes can be achieved online in predesigned PV inverters. Case studies have verified the effectiveness and flexibilities of the proposal to realise the advanced features.
Original languageEnglish
JournalIET Renewable Power Generation
Issue number4
Pages (from-to)504 – 513
Number of pages12
Publication statusPublished - Apr 2016


  • Electric current control
  • Photovoltaic power systems
  • Invertors
  • Power control


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