Equivalent DC impedance of a three-phase impedance through an inverter
(2023) CIRED2023 — Location: Rome, Italy (12.June.2023)
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- Abstract
- The distribution grid is currently changing. The number of inverters interfacing Low and Medium voltage DC systems has been gradually increasing. The same rectifiers/inverters are also converting the DC voltage, produced by Photovoltaic panels (PVs), into AC voltages (the distribution system, e.g.). Moreover, some DC microgrids need AC/DC converter to have a link with the main grid. This work aims to study and understand the impact of the three-phase (AC) network impedance on the DC side of an AC/DC converter. To do so, the AC impedance is translated into the DC side of the converter through an equivalent DC impedance. This DC equivalent impedance depends on the PWM parameters (modulating index, e.g.). Therefore, this DC equivalent impedance can be used by the upper control layers (i.e. current controls, power controls). The behaviour of the equivalent model in DC as a resistive-inductive load will be presented. The mathematical development is implemented in MATLAB/Simulink and the simulation results are verified through an experimental implementation. Based on these results, the performance of this DC equivalent electrical circuit model will be studied along with some improvements possible on this model.
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Citations
Delhaye, Q., Bekemans, M., & De Jaeger, E. (2023). Equivalent DC impedance of a three-phase impedance through an inverter. CIRED2023, Rome, Italy. https://hdl.handle.net/2078.5/235263