Power control of a grid-connected PV system during asymmetrical voltage faults

  • Gustavo Hunter
  • Javier RiedemannEmail author
  • Iván Andrade
  • Ramón Blasco-Gimenez
  • Rubén Peña
Original Paper


Under voltage faults, grid-tied photovoltaic inverters should remain connected to the grid according to fault ride-through requirements. Moreover, it is a desirable characteristic to keep the power injected to grid constant during the fault. This paper explores a control strategy to regulate the active and reactive powers delivered by a single-stage photovoltaic generation system to the grid during asymmetrical voltage faults. The reference for the active power is obtained from a maximum power point tracking algorithm, whereas the reference for the reactive power can be set freely if the zero-sequence voltage is null; otherwise, it will depend on the magnitude of the zero-sequence voltage and the active power reference. The power control loop generates the reference currents to be imposed by the grid-tied power inverter. These currents are regulated by a predictive controller. The proposed approach is simpler than other methods proposed in the literature. The performance of the control strategy presented is verified with an experimental laboratory setup where voltage sags and swells are considered.


Solar power generation Current control Power generation 

List of symbols




Maximum power point tracking


Direct current


Alternating current


Active power


Reactive power


Instantaneous active reactive control


Average active reactive control


Balanced positive sequence control


Positive–negative sequence control


Fault ride-through


Low voltage ride-through


Phase locked loop


Voltage source converter


Low voltage


Medium voltage


Perturb and observe


Point of common connection


Total harmonic distortion

\( v_{abc} \)

Voltage in \( abc \) reference frame

\( v_{\alpha \beta \gamma } \)

Voltage in \( \alpha \beta \gamma \) reference frame

\( i_{abc} \)

Current in \( abc \) reference frame

\( i_{\alpha \beta \gamma } \)

Current in \( \alpha \beta \gamma \) reference frame

\( i_{\alpha \beta }^{*} \)

Reference current in \( \alpha \beta \) reference frame

\( p\left( t \right) \)

Instantaneous active power

\( \left| {[q_{abc} ]} \right| \)

Instantaneous reactive power

\( p_{\text{ref}} \)

Active power reference

\( |q|_{\text{ref}} \)

Reactive power reference



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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Electrical EngineeringUniversidad de ConcepciónConcepciónChile
  2. 2.School of Electrical EngineeringPontificia Universidad Católica de ValparaísoValparaísoChile
  3. 3.Department of Electrical EngineeringUniversidad de MagallanesPunta ArenasChile
  4. 4.Department of Systems and AutomaticsUniversitat Politécnica de ValenciaValenciaSpain

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