HIGH VOLTAGE RIDE THROUGH (HVRT)

High Voltage Ride Through (HVRT)

What is HVRT?

High Voltage Ride Through (HVRT) means the ability of a power plant to stay connected to the grid during high voltage conditions.

High voltage may occur for a short time.
The plant should not trip immediately during this period.

HVRT is mandatory for:

• Solar power plants

• Wind power plants

• Battery Energy Storage Systems (BESS)

Why is HVRT Important?

HVRT  the grid remain stable.

If many plants trip together:

• Grid voltage becomes unstable

• Power system may collapse

• Blackout risk increases

So, grid codes require ride-through instead of tripping

When Does High Voltage Occur?

High voltage usually happens due to:

• Sudden load rejection

• Clearing of transmission line faults

• Switching of capacitor banks

• Lightly loaded or weak grids

These events are temporary, not permanent faults.

What Should the Plant Do During HVRT?

During high voltage:

• The plant must stay connected

• Active power output is reduced

• Reactive power is absorbed

• Voltage support is provided to the grid

After voltage returns to normal:

• Plant resumes normal operation automatically

HVRT Voltage–Time Requirement

Grid codes define how long a plant must stay connected.

Conclusion

High Voltage Ride Through (HVRT) is an essential grid requirement for modern power plants.

It ensures that solar, wind, and BESS plants remain connected during short-term over-voltage conditions. Instead of tripping, the plant supports the grid by absorbing reactive power and reducing active power.