Microgrid Low Voltage Ride Through Technology

Does LVRT work in microgrid system?

To verify the proposed method, three different types of faults are studied. The scheme with enhanced LVRT capability in the microgrid system is implemented and tested successfully. The results confirm the validity of the proposed method as compared to other approaches. The DG could stay connected to the grid throughout the sag.

How LVRT is used in droop-based microgrids?

Necessary reactive power is injected to grid and the rest of inverter capacity is allocated to the active power injection. In [ 28 ], LVRT capability is applied in hierarchical control of droop-based microgrids and each phase is controlled independently, eliminating the need for symmetrical components calculation.

Are microgrids greener than conventional power plants?

The widely used conventional power plants, have some obvious drawbacks including CO 2 emission, power losses, poor efficiency, greater infrastructural and operational costs, and poor reliability. As a result, microgrids were introduced as greener alternatives to handle increased power requirements.

What are the main protection issues in microgrids?

One of the main protection issues is the possible malfunctioning of protection devices under fault conditions in microgrids with integrated distributed energy resources (DERs).

What is grid voltage during a healthy condition?

The grid voltage during the healthy condition is considered as the condition before fault where the positive and negative sequence grid voltages are 180 V and 0 V, respectively. This is a constant magnitude voltage curve. Magnitude of reference for positive sequence of voltage in case 1.

What is the difference between reference grid voltage based on LVRT requirements?

Whereas, in the proposed method, based on the reference grid voltage according to LVRT requirements, the variable references of current components are considered during different types of voltage sags so, that DGs can stay connected to the grid longer.