Application Description
Application Description: Breakthrough in Test Procedures for Islanding Detection Page 1 of 9
Breakthrough in Test Procedures for Islanding Detection
New methods for Anti-Islanding Tests for Grid-tied Power Generator Equipment
according to IEEE 1547 or DIN V VDE V 0126-1-1 or VDE-AR-N 4105 by Means of
Simulated Impedance with REGATRON TC.ACS
Authors: Bruno Ammann, B.Sc., Senior Field Application Engineer, REGATRON AG
Gabriel Schlaepfer, B.Sc., Development Engineer Hardware, REGATRON AG
Keywords: IEEE 1547, VDE V 0126-1-1:2013-08, VDE-AR-N 4105:2011-08, grid-tied power generating equipment, public
low-voltage grid, RLC tuned circuit, islanding condition, anti-islanding test, regenerative 4-quadrant grid simulator,
REGATRON TC.ACS, regenerative four quadrant operation, substitution of bulky and expensive RLC-components, RLCSim
mode, GRIDSim mode, ACSControl software, simulated complex impedance, Standard for Interconnecting Distributed
Resources with Electric Power Systems
Overview
The standards DIN V VDE V 0126-1-1 [1] or VDE-AR-N 4105 [2] or IEEE 1547 provide strict regulations for power
generating equipment feeding the public grid. The main aim is to harmonize all important technical specifications
and to prevent safety risks at “islanding” conditions.
Up to now test methods using passive tuned circuits require a considerable effort both in terms of expensive
components as also of work time. Power circuit simulation by REGATRON TC.ACS series allows for replacing lumped
component R-L-C-circuits simply by “Simulated Impedance”. Furthermore the same TC.ACS device can be used to
perform all necessary voltage and frequency tests based on the same test circuit, therefore the complete range of
test requirements according to standard DIN V VDE V 0126-1-1 [1] or IEEE 1547 is being met with a fraction of
expenditures both in time as in material.
Up-to-now Standard Test in Detail
With respect to frequency and voltage the standard DIN V VDE V 0126-1-1 [1] or VDE-AR-N 4105 [2] respectively
defines limits, the violation of which power equipment need to detect and then disconnect from the grid. The
device under test (DUT) has to disconnect from the grid autonomously within 0.1 second when voltages either fall
below 80% or exceed 115% of the nominal voltage (UN). Also frequencies (f) below 47.5 Hz and above 51.5 Hz must
result in disconnection within 0.1 second. Already today in many cases a grid simulator is used to confirm the
fulfillment of these requirements.
Moreover the DIN/VDE standard states that an islanding condition must be reliably detected and a disconnection
from the public low voltage system has to be executed within 5 seconds.
Figure 1: Test set-up for the detection of islanding operation according to VDE-AR-N 4105 [2]