Abstract
Islanded microgrids are discussed in the context of new operational concepts for the public distribution grid to ensure power supply during disruptive events. Since the connection to upper grid levels is not available in such cases, the grid voltage must be provided locally. This can be achieved by using grid-forming inverters in islanded operation mode. However, the temporary operation of such islanded grids in public distribution grids has not been established and the stability has not been fully researched. One related topic is the harmonic stability, which can be assessed using the impedance-based stability criterion. For its application, frequency-dependent impedances of grid-forming inverters are required. However, test procedures and corresponding test facilities are generally not available. Moreover, typical test voltage sources cannot be operated in parallel with grid-forming inverters without any additional synchronization. In this paper, a test setup is implemented enabling the measurement of frequency-dependent impedances of grid-forming inverters using such a typical linear voltage amplifier. The results confirm that impedances can be extracted with the test setup and measurement results are shown for commercially available battery inverters. Additionally, limitations of the test setup and aspects that should be considered upon usage are presented.
Published Version
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