Test Case 4

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

Identification

ID

4

Author

A. Paspatis, A. Kontou, A. F. Cortés Borray, Julia Merino

Version

3

Project

ERIGRID 2.0

Date

13/04/2021

Test Case Definition

Name of the Test Case

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

Narrative

A microgrid with inverter-interfaced distributed energy resources (DERs) is considered. In order to respect the system regulations and successfully feed the microgrid load, the voltage across the microgrid needs to be regulated close to its nominal value.

Through the control design of the inverter-interfaced distributed energy resources, different control schemes are investigated. In particular i) master-slave voltage control, ii) conventional droop grid-forming control and iii) inverse droop grid-forming control.

Function(s) under Investigation (FuI)

Voltage regulation in a microgrid with inverter-interfaced DERs

Object under Investigation (OuI)

Inverter-interfaced distributed energy resources controllers

Domain under Investigation (DuI)

Electrical Power

Control systems

Purpose of Investigation (PoI)

Comparison of different voltage control schemes

System under Test (SuT)

A microgrid that hosts multiple inverter-interfaced distributed energy resources, lines, loads, etc.

Functions under Test (FuT)

Different voltage control schemes to achieve microgrid load voltage regulation

Test criteria (TCR)

Microgrid operation according to the designed control algorithm

Target Metrics (TM)
  1. Voltage measured at the output of the inverter (Is proper voltage regulation achieved?)
  2. Number of interruptions (Is continuity of service achieved after a sudden change in the demand and/or output of RES, or a generator outage?)
  3. Overall performance (What are the advantages and disadvantages of each technique?)
Variability Attributes (VA)
  1. Different microgrid loading
  2. Different line impedance nature (i.e., resistive or inductive or complex)
Quality Attributes (QA)

Microgird voltages inside the ±5% of the nominal voltage / Successful

Qualification Strategy

The most common voltage control algorithms for inverter-based microgrids will be validated through three tests, one for each control technique, where the inverters forming the inverter-based microgrid will be equipped with the appropriate voltage control algorithm. Then, the results will be collected to perform the comparison between the different voltage control techniques.

Test Specification 4.01

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