Test Specification 4.01

Test Rationale

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.

Specific Test System

Laboratory setup

Target measures

Microgrid voltages

Input and output parameters

Input:

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

Test Design

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

Initial system state

• 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

Evolution of system state and test signals

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

Other parameters

N/A

Temporal resolution

At least 0.1 ms.

Source of uncertainty

Impedance of load and lines, inverter sensors operation

Suspension criteria / Stopping criteria

Abnormal current/ power injections from inverters or tripping of inverters

Mapping to Research Infrastructure