Delta Power Control Strategy for Multi-String Grid-Connected PV Inverters

Ariya Sangwongwanich, Yongheng Yang, Frede Blaabjerg, Dezso Sera

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

15 Citations (Scopus)
404 Downloads (Pure)


With a still increasing penetration level of grid-connected PV systems, more advanced active power control functionalities have been introduced in certain grid regulations. A delta power constraint, where a portion of the active power from the PV panels is reserved during operation, is required for grid support (e.g., during frequency deviation). In this paper, a cost-effective solution to realize delta power control for grid-connected PV systems is presented, where the residential/commercial multi-string PV inverter configuration is adopted. This control strategy is a combination of Maximum Power Point Tracking (MPPT) and Constant Power Generation (CPG) modes. In this control scheme, one PV string operating in the MPPT mode estimates the available power, while the other PV strings regulate the total PV power by the CPG control strategy in such a way that the delta power constraint for the entire PV system is achieved. Simulations and experiments have been performed on a 3-kW single-phase grid-connected PV system. The results have confirmed the effectiveness of the delta power control strategy, where the power reserve according to the delta power constraint is achieved under several operating conditions.
Original languageEnglish
Title of host publicationProceedings of the 8th Annual IEEE Energy Conversion Congress and Exposition (ECCE) 2016
Number of pages7
PublisherIEEE Press
Publication dateSep 2016
ISBN (Electronic)978-1-5090-0737-0
Publication statusPublished - Sep 2016
Event 8th Annual IEEE Energy Conversion Congress & Exposition: ECCE 2016 - Milwaukee, WI, United States
Duration: 18 Sep 201622 Sep 2016


Conference 8th Annual IEEE Energy Conversion Congress & Exposition
Country/TerritoryUnited States
CityMilwaukee, WI
SponsorIEEE, IEEE Industry Applications Society (IAS), IEEE Power Electronics and Industry Applications Societies (PELS)
Internet address


  • Active power control
  • Reserved power control
  • Maximum power point tracking
  • Constant power generation control
  • PV systems
  • Grid-connected power converters


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