Test Specification 4.01

4.01

TC4

Performance of different voltage control techniques for inverter-interfaced DERs in microgrids

This test will perform a comparison between different voltage control schemes that are widely used in inverter-based microgrids, i.e., master-slave control, conventional droop control and inverse droop control. Aiming to quantify the effectiveness of the aforementioned techniques, their pros & cons will be ultimately identified.

Laboratory setup

Microgrid voltages

Input:

• Level of unbalance of the load
• Inverter power injection set-points and limits
• DERs control parameters
• Microgrid characteristics

Output:

• Microgrid voltages

1. Operate multiple inverters in parallel
2. Perform load changes and observe voltage regulation (continuity of service)
3. Save the experimental results

• Inverter controllers enabled
• Load disconnected
• Grid voltages based on the nominal output values of the inverters
• Hardware or simulated network and devices up and running
• Power analyzer and computers displaying and saving data

The microgrid system is subjected to load variations (step changes)

N/A

At least 0.1 ms.

Impedance of load and lines, inverter sensors operation

Abnormal current/ power injections from inverters or tripping of inverters