Low voltage ride through

Hello,please how can i make low voltage ride through voltage for pv system?

Answer 1

[Abhas]

Hi @Zainab,

You can follow the below steps to implement Low Voltage Ride‑Through (LVRT) for a PV system in MATLAB/Simulink:

1. Define the LVRT voltage–time profile in MATLAB (e.g., a pu drop to 0.7 at 0.1 s, hold till 0.6 s, then ramp to 1 pu) using a MATLAB function like "simulateLVRT"
2. Apply this profile to a programmable three-phase voltage source in Simulink, emulating grid sag per your grid code.
3. Implement sag-detection logic by measuring real-time voltage (per-unit), switching to LVRT control when below threshold, and injecting reactive current (Iq) using control blocks or MATLAB function .
4. Modify inverter control for LVRT: Limit active power and inject reactive support during sag, then restore nominal operation afterward.

You may refer to the below MathWorks examples and documentation to know more about the implementation:

1. “Detailed Model of a 100‑kW Grid‑Connected PV Array” shows three-phase PV‑inverter setup: https://www.mathworks.com/help/sps/ug/detailed-model-of-a-100-kw-grid-connected-pv-array.html
2. “Grid‑Tied Inverter” docs include Fault Ride‑Through algorithm guidance: https://www.mathworks.com/discovery/grid-tied-inverter.html

I hope this helps!