2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe) 2019
DOI: 10.1109/isgteurope.2019.8905769
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Online Impedance Measurement of a Modular Multilevel Converter

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Cited by 8 publications
(6 citation statements)
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“…Example structure of voltage perturbation tests using a grid emulator is illustrated in Figure 3. Accordingly, the perturbation voltage is added to the control reference signal of the grid emulator converter to be emulated at the terminal of the DUT [29][30][31]. In this part, the impacts of a grid emulator, DUT, and measurement equipment on the test results are explained.…”
Section: Technical Recommendations For Trustworthy Test Resultsmentioning
confidence: 99%
See 2 more Smart Citations
“…Example structure of voltage perturbation tests using a grid emulator is illustrated in Figure 3. Accordingly, the perturbation voltage is added to the control reference signal of the grid emulator converter to be emulated at the terminal of the DUT [29][30][31]. In this part, the impacts of a grid emulator, DUT, and measurement equipment on the test results are explained.…”
Section: Technical Recommendations For Trustworthy Test Resultsmentioning
confidence: 99%
“…Furthermore, there could be additional set-points for the DUT such as rotor speed, protection scheme, number of involving modules in the test, and switching commands for control systems and breakers. The perturbations can be performed through an automatic test schedule and the set-points would be defined before initiating the tests [29][30][31][32].…”
Section: Test Planmentioning
confidence: 99%
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“…In case the MMC under investigation works as grid forming converter, PA 1 operates as current source with a 50 Hz current for setting an operation point in addition to the perturbation current at f pert . The perturbation voltage source is part of the frequency measurement method [6]. Its frequency, f pert , is time-dependent and determined by the frequency generator.…”
Section: MMC Impedance Measurement Setupmentioning
confidence: 99%
“…Depending on the available information, both Z MMC and Z grid could be calculated using a frequency sweep approach or provided by either the respective grid operator or converter manufacturer, so that stability analyses can be conducted without the need for converter-internal data. Whereas previous literature mainly focuses on the derivation of the MMCs' equivalent impedance Z MMCeither in an analytical way [6][7][8] or via using frequency sweep measurements [11,12]-the DC network and the corresponding Z grid are often modeled in a simplified way; for example, DC cables are assumed as simple Pi-section models, which are very limited with regard to modeling the frequency dependent impedance behavior [13]. Hence, the overall DC grid impedance Z grid relevant for stability analyses can only be derived for a small bandwidth of lower frequencies.…”
Section: Introductionmentioning
confidence: 99%