Test Specification 02.01

Complying with the fault-ride-through (FRT) requirements while maintaining power sharing

Test Specification Definition

ID	02.01
Reference to Test Case	02
Title of Test	Complying with the fault-ride-through (FRT) requirements while maintaining power sharing
Test Rationale	N/A
Specific Test System (graphical)
Target measures	Inverter power injection, load voltage and frequency, inverter currents
Input and output parameters	Input: Load Inverter power injection set-points Grid conditions Output: Power, voltage, current and frequency measurements
Test Design	Operate multiple inverters in parallel Perform a network fault when the microgrid operates either in islanded (non-interconnected) mode or in grid-connected mode Save the experimental results
Initial system state	Inverter controllers enabled Hardware or simulated network and devices up and running Computer displaying and saving data
Evolution of system state and test signals	The system goes from normal operation (operation close to nominal voltage and frequency) to operation under grid faults, to test the inverter control algorithms
Other parameters	N/A
Temporal resolution	N/A
Source of uncertainty	Impedance of load and lines, inverter sensors operation
Suspension criteria / Stopping criteria	Abnormal current/ power injections from inverters

Hardware-in-the-Loop for inverter controller validation in real conditions