Adaptive Reactive Power Control of PV Power Plants for Improved Power Transfer Capability under Ultra-Weak Grid Conditions

Dongsheng Yang, Xiongfei Wang, Fangcheng Liu, Kai Xin, Yunfeng Liu, Frede Blaabjerg

Research output: Contribution to journalJournal articleResearchpeer-review

2 Citations (Scopus)
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Abstract

This paper analyzes the power transfer limitation of the PV power plant under the ultra-weak grid condition, i.e., when the Short-Circuit Ratio (SCR) is close to 1. It explicitly identifies that a minimum SCR of 2 is required for the PV power plant to deliver the rated active power when operating with the unity power factor. Then, considering the reactive power compensation from PV inverters, the minimum SCR in respect to Power Factor (PF) is derived, and the optimized coordination of the active and reactive power is exploited. It is revealed that the power transfer capability of PV power plant under the ultra-weak grid is significantly improved with the low PF operation. An adaptive reactive power droop control is next proposed to effectively distribute the reactive power demands to the individual inverters, and meanwhile maximize the power transfer capacity of the PV power plant. Simulation results of a 200 MW PV power plant demonstrate that the proposed method can ensure the rated power transfer of PV power plant with the SCR of 1.25, provided that the PV inverters are operated with the minimal PF=0.9.
Original languageEnglish
Article number8119851
JournalI E E E Transactions on Smart Grid
Volume10
Issue number2
Pages (from-to)1269-1279
Number of pages11
ISSN1949-3053
DOIs
Publication statusPublished - Mar 2019

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Reactive power
Power control
Power plants
Short circuit currents

Keywords

  • Droop control
  • Impedance
  • Inverters
  • Photovoltaic power systems
  • Power generation
  • Power system stability
  • Power transmission lines
  • Power transmission.
  • Reactive power
  • Reactive power compensation
  • Voltage control

Cite this

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title = "Adaptive Reactive Power Control of PV Power Plants for Improved Power Transfer Capability under Ultra-Weak Grid Conditions",
abstract = "This paper analyzes the power transfer limitation of the PV power plant under the ultra-weak grid condition, i.e., when the Short-Circuit Ratio (SCR) is close to 1. It explicitly identifies that a minimum SCR of 2 is required for the PV power plant to deliver the rated active power when operating with the unity power factor. Then, considering the reactive power compensation from PV inverters, the minimum SCR in respect to Power Factor (PF) is derived, and the optimized coordination of the active and reactive power is exploited. It is revealed that the power transfer capability of PV power plant under the ultra-weak grid is significantly improved with the low PF operation. An adaptive reactive power droop control is next proposed to effectively distribute the reactive power demands to the individual inverters, and meanwhile maximize the power transfer capacity of the PV power plant. Simulation results of a 200 MW PV power plant demonstrate that the proposed method can ensure the rated power transfer of PV power plant with the SCR of 1.25, provided that the PV inverters are operated with the minimal PF=0.9.",
keywords = "Droop control, Impedance, Inverters, Photovoltaic power systems, Power generation, Power system stability, Power transmission lines, Power transmission., Reactive power, Reactive power compensation, Voltage control",
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Adaptive Reactive Power Control of PV Power Plants for Improved Power Transfer Capability under Ultra-Weak Grid Conditions. / Yang, Dongsheng; Wang, Xiongfei; Liu, Fangcheng; Xin, Kai; Liu, Yunfeng; Blaabjerg, Frede.

In: I E E E Transactions on Smart Grid, Vol. 10, No. 2, 8119851, 03.2019, p. 1269-1279.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

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AU - Yang, Dongsheng

AU - Wang, Xiongfei

AU - Liu, Fangcheng

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AU - Liu, Yunfeng

AU - Blaabjerg, Frede

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AB - This paper analyzes the power transfer limitation of the PV power plant under the ultra-weak grid condition, i.e., when the Short-Circuit Ratio (SCR) is close to 1. It explicitly identifies that a minimum SCR of 2 is required for the PV power plant to deliver the rated active power when operating with the unity power factor. Then, considering the reactive power compensation from PV inverters, the minimum SCR in respect to Power Factor (PF) is derived, and the optimized coordination of the active and reactive power is exploited. It is revealed that the power transfer capability of PV power plant under the ultra-weak grid is significantly improved with the low PF operation. An adaptive reactive power droop control is next proposed to effectively distribute the reactive power demands to the individual inverters, and meanwhile maximize the power transfer capacity of the PV power plant. Simulation results of a 200 MW PV power plant demonstrate that the proposed method can ensure the rated power transfer of PV power plant with the SCR of 1.25, provided that the PV inverters are operated with the minimal PF=0.9.

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